// TITLE: USB HID device class driver
#include <stdbool.h>
#include <stdint.h>
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "debug.h"
#include "usb.h"
#include <usblib.h>
#include <usblibpriv.h>
#include <usbhid.h>
#include <device/usbdevice.h>
#include <device/usbdhid.h>
//*****************************************************************************
//
//! \addtogroup hid_device_class_api
//! @{
//
//*****************************************************************************
//*****************************************************************************
//
// The subset of endpoint status flags that we consider to be reception
// errors. These are passed to the client via USB_EVENT_ERROR if seen.
//
//*****************************************************************************
#define USB_RX_ERROR_FLAGS (USBERR_DEV_RX_DATA_ERROR | \
USBERR_DEV_RX_OVERRUN | \
USBERR_DEV_RX_FIFO_FULL)
//*****************************************************************************
//
// Marker used to indicate that a given HID descriptor cannot be found in the
// client-supplied list.
//
//*****************************************************************************
#define HID_NOT_FOUND 0xFFFFFFFF
//*****************************************************************************
//
// Flags that may appear in ui16DeferredOpFlags to indicate some operation that
// has been requested but could not be processed at the time it was received.
// Each deferred operation is defined as the bit number that should be set in
// tHIDInstance->ui16DeferredOpFlags to indicate that the operation is pending.
//
//*****************************************************************************
#define HID_DO_PACKET_RX 5
#define HID_DO_SEND_IDLE_REPORT 6
//*****************************************************************************
//
// Endpoints to use for each of the required endpoints in the driver.
//
//*****************************************************************************
#define INT_IN_ENDPOINT USB_EP_3
#define INT_OUT_ENDPOINT USB_EP_3
//*****************************************************************************
//
// Device Descriptor. This is stored in RAM to allow several fields to be
// changed at runtime based on the client's requirements.
//
//*****************************************************************************
uint8_t g_pui8HIDDeviceDescriptor[] =
{
18, // Size of this structure.
USB_DTYPE_DEVICE, // Type of this structure.
USBShort(0x110), // USB version 1.1 (if we say 2.0, hosts assume
// high-speed - see USB 2.0 spec 9.2.6.6)
USB_CLASS_DEVICE, // USB Device Class
0, // USB Device Sub-class
USB_HID_PROTOCOL_NONE, // USB Device protocol
USBDHID_MAX_PACKET, // Maximum packet size for default pipe.
USBShort(0), // Vendor ID (VID).
USBShort(0), // Product ID (PID).
USBShort(0x100), // Device Version BCD.
1, // Manufacturer string identifier.
2, // Product string identifier.
3, // Product serial number.
1 // Number of configurations.
};
//*****************************************************************************
//
// Forward references for device handler callbacks
//
//*****************************************************************************
static void HandleGetDescriptor(void *pvHIDInstance, tUSBRequest *psUSBRequest);
static void HandleRequest(void *pvHIDInstance, tUSBRequest *psUSBRequest);
static void HandleConfigChange(void *pvHIDInstance, uint32_t ui32Info);
static void HandleEP0DataReceived(void *pvHIDInstance, uint32_t ui32Info);
static void HandleEP0DataSent(void *pvHIDInstance, uint32_t ui32Info);
static void HandleReset(void *pvHIDInstance);
static void HandleSuspend(void *pvHIDInstance);
static void HandleResume(void *pvHIDInstance);
static void HandleDisconnect(void *pvHIDInstance);
static void HandleEndpoints(void *pvHIDInstance, uint32_t ui32Status);
static void HandleDevice(void *pvHIDInstance, uint32_t ui32Request,
void *pvRequestData);
//*****************************************************************************
//
// The device information structure for the USB HID devices.
//
//*****************************************************************************
const tCustomHandlers g_sHIDHandlers =
{
//
// GetDescriptor
//
HandleGetDescriptor,
//
// RequestHandler
//
HandleRequest,
//
// InterfaceChange
//
0,
//
// ConfigChange
//
HandleConfigChange,
//
// DataReceived
//
HandleEP0DataReceived,
//
// DataSentCallback
//
HandleEP0DataSent,
//
// ResetHandler
//
HandleReset,
//
// SuspendHandler
//
HandleSuspend,
//
// ResumeHandler
//
HandleResume,
//
// DisconnectHandler
//
HandleDisconnect,
//
// EndpointHandler
//
HandleEndpoints,
//
// Device handler.
//
HandleDevice
};
//*****************************************************************************
//
// Set or clear deferred operation flags in an "atomic" manner.
//
// \param pui16DeferredOp points to the flags variable which is to be modified.
// \param ui16Bit indicates which bit number is to be set or cleared.
// \param bSet indicates the state that the flag must be set to. If \b true,
// the flag is set, if \b false, the flag is cleared.
//
// This function safely sets or clears a bit in a flag variable. The operation
// makes use of bitbanding to ensure that the operation is atomic (no read-
// modify-write is required).
//
// \return None.
//
//*****************************************************************************
static void
SetDeferredOpFlag(volatile uint16_t *pui16DeferredOp, uint16_t ui16Bit,
bool bSet)
{
//
// Set the flag bit to 1 or 0 using a bitband access.
//
#ifdef __TMS320C28XX__
HWREGBITHW(pui16DeferredOp, ui16Bit, bSet ? 1 : 0);
#else
HWREGBITH(pui16DeferredOp, ui16Bit) = bSet ? 1 : 0;
#endif
}
//*****************************************************************************
//
// This function is called to clear the counter used to keep track of the time
// elapsed since a given report was last sent.
//
// \param psHIDDevice points to the HID device structure whose report timer is
// to be cleared.
// \param ui8ReportID is the first byte of the report to be sent. If this
// device offers more than one input report, this value is used to find the
// relevant report timer structure in the psHIDDevice structure.
//
// \return None.
//
//*****************************************************************************
static void
ClearReportTimer(const tUSBDHIDDevice *psHIDDevice, uint8_t ui8ReportID)
{
uint32_t ui32Loop;
if(psHIDDevice->ui8NumInputReports > 1)
{
//
// We have more than 1 input report so the report must begin with a
// byte containing the report ID. Scan the table we were provided
// when the device was initialized to find the entry for this report.
//
for(ui32Loop = 0; ui32Loop < psHIDDevice->ui8NumInputReports;
ui32Loop++)
{
if(psHIDDevice->psReportIdle[ui32Loop].ui8ReportID == ui8ReportID)
{
break;
}
}
}
else
{
ui32Loop = 0;
}
//
// If we drop out of the loop with an index less than ui8NumInputReports,
// we found the relevant report so clear its timer.
//
if(ui32Loop < psHIDDevice->ui8NumInputReports)
{
psHIDDevice->psReportIdle[ui32Loop].ui32TimeSinceReportmS = 0;
}
}
//*****************************************************************************
//
// This function is called to clear the idle period timers for each input
// report supported by the device.
//
// \param psHIDDevice points to the HID device structure whose timers are to be
// cleared.
// \param ui32TimemS is the elapsed time in milliseconds since the last call
// to this function.
//
// \return None.
//
//*****************************************************************************
static void
ClearIdleTimers(const tUSBDHIDDevice *psHIDDevice)
{
uint32_t ui32Loop;
//
// Clear the "time till next report" counters for each input report.
//
for(ui32Loop = 0; ui32Loop < psHIDDevice->ui8NumInputReports; ui32Loop++)
{
psHIDDevice->psReportIdle[ui32Loop].ui16TimeTillNextmS =
psHIDDevice->psReportIdle[ui32Loop].ui8Duration4mS * 4;
}
}
//*****************************************************************************
//
// This function is called periodically to allow us to process the report idle
// timers.
//
// \param psHIDDevice points to the HID device structure whose timers are to be
// updated.
// \param ui32ElapsedmS indicates the number of milliseconds that have elapsed
// since the last call to this function.
//
// \return None.
//
//*****************************************************************************
static void
ProcessIdleTimers(const tUSBDHIDDevice *psHIDDevice, uint32_t ui32ElapsedmS)
{
uint32_t ui32Loop, ui32SizeReport;
void *pvReport;
tHIDInstance *psInst;
bool bDeferred;
//
// Get our instance data pointer
//
psInst = &((tUSBDHIDDevice *)psHIDDevice)->sPrivateData;
//
// We have not had to defer any report transmissions yet.
//
bDeferred = false;
//
// Look at each of the input report idle timers in turn.
//
for(ui32Loop = 0; ui32Loop < psHIDDevice->ui8NumInputReports; ui32Loop++)
{
//
// Update the time since the last report was sent.
//
psHIDDevice->psReportIdle[ui32Loop].ui32TimeSinceReportmS +=
ui32ElapsedmS;
//
// Is this timer running?
//
if(psHIDDevice->psReportIdle[ui32Loop].ui8Duration4mS)
{
//
// Yes - is it about to expire?
//
if(psHIDDevice->psReportIdle[ui32Loop].ui16TimeTillNextmS <=
ui32ElapsedmS)
{
//
// The timer is about to expire. Can we send a report right
// now?
//
if((psInst->iHIDTxState == eHIDStateIdle) &&
(psInst->bSendInProgress == false))
{
//
// We can send a report so send a message to the
// application to retrieve its latest report for
// transmission to the host.
//
ui32SizeReport = psHIDDevice->pfnRxCallback(
psHIDDevice->pvRxCBData,
USBD_HID_EVENT_IDLE_TIMEOUT,
psHIDDevice->psReportIdle[ui32Loop].ui8ReportID,
&pvReport);
//
// Schedule the report for transmission.
//
USBDHIDReportWrite((void *)psHIDDevice, pvReport,
ui32SizeReport, true);
//
// Reload the timer for the next period.
//
psHIDDevice->psReportIdle[ui32Loop].ui16TimeTillNextmS =
psHIDDevice->psReportIdle[ui32Loop].ui8Duration4mS * 4;
}
else
{
//
// We can't send the report straight away so flag it for
// transmission as soon as the previous transmission ends.
//
psHIDDevice->psReportIdle[ui32Loop].ui16TimeTillNextmS = 0;
bDeferred = true;
}
}
else
{
//
// The timer is not about to expire. Update the time till the
// next report transmission.
//
psHIDDevice->psReportIdle[ui32Loop].ui16TimeTillNextmS -=
ui32ElapsedmS;
}
}
}
//
// If we had to defer transmission of any report, remember this so that we
// will process it as soon as possible.
//
SetDeferredOpFlag(&psInst->ui16DeferredOpFlags, HID_DO_SEND_IDLE_REPORT,
bDeferred);
}
static void
SetIdleTimeout(const tUSBDHIDDevice *psHIDDevice, uint8_t ui8ReportID,
uint8_t ui8Timeout4mS)
{
uint32_t ui32Loop;
bool bReportNeeded;
tHIDReportIdle *psIdle;
//
// Remember that we have not found any report that needs to be sent
// immediately.
//
bReportNeeded = false;
//
// Search through all the input reports looking for ones that fit the
// requirements.
//
for(ui32Loop = 0; ui32Loop < psHIDDevice->ui8NumInputReports; ui32Loop++)
{
psIdle = &psHIDDevice->psReportIdle[ui32Loop];
//
// If the report ID passed matches the report ID in the idle timer
// control structure or we were passed a report ID of zero, which
// indicates that all timers are to be set...
//
if(!ui8ReportID || (ui8ReportID == psIdle->ui8ReportID))
{
//
// Save the new duration for the idle timer.
//
psIdle->ui8Duration4mS = ui8Timeout4mS;
//
// Are we enabling the idle timer? If so, fix up the time until it
// needs to fire.
//
if(ui8Timeout4mS)
{
//
// Determine what the timeout is for this report given the time
// since the last report of this type was sent.
//
if(psIdle->ui32TimeSinceReportmS >=
((uint32_t)ui8Timeout4mS * 4))
{
psIdle->ui16TimeTillNextmS = 0;
bReportNeeded = true;
}
else
{
psIdle->ui16TimeTillNextmS =
(((uint16_t)ui8Timeout4mS * 4) -
psIdle->ui32TimeSinceReportmS);
}
}
}
}
//
// If we get to here and bReportNeeded is true, this means we need to
// send back at least one of the input reports as soon as possible. Try
// to do this immediately.
//
if(bReportNeeded)
{
ProcessIdleTimers(psHIDDevice, 0);
}
}
//*****************************************************************************
//
// Find the idle timeout for a given HID input report.
//
// \param psHIDDevice points to the HID device whose report idle timeout is to
// be found.
// \param ui8ReportID identifies the report whose timeout is requested. If 0,
// the timeout for the first report is returns, regardless of its ID (or
// whether it has one).
//
// This function returns the current idle timeout for a given HID input report.
// The value returned is expressed in terms of 4mS intervals. Convert to
// milliseconds by multiplying by 4. If the return value is 0, this indicates
// that an infinite timeout is currently set and the device will not send the
// report unless a state change occurs.
//
// \return Returns the current idle timeout for the given report.
//
//*****************************************************************************
static uint32_t
GetIdleTimeout(const tUSBDHIDDevice *psHIDDevice, uint8_t ui8ReportID)
{
uint32_t ui32Loop;
tHIDReportIdle *psIdle;
//
// Search through all the input reports looking for ones that fit the
// requirements.
//
for(ui32Loop = 0; ui32Loop < psHIDDevice->ui8NumInputReports; ui32Loop++)
{
psIdle = &psHIDDevice->psReportIdle[ui32Loop];
//
// If the report ID passed matches the report ID in the idle timer
// control structure or we were passed a report ID of zero, which
// indicates that all timers are to be set...
//
if(!ui8ReportID || (ui8ReportID == psIdle->ui8ReportID))
{
//
// We found a report matching the required ID or we were not passed
// an ID and we are looking at the first report information.
//
return((uint32_t)psIdle->ui8Duration4mS);
}
}
//
// If we drop out, the report could not be found so we need to indicate
// an error.
//
return(HID_NOT_FOUND);
}
//*****************************************************************************
//
// Find the n-th HID class descriptor of a given type in the client-provided
// descriptor table.
//
// \param psHIDDevice points to the HID device which is to be searched for the
// required class descriptor.
// \param ui8Type is the type of class descriptor being requested. This will
// be either USB_HID_DTYPE_REPORT or USB_HID_DTYPE_PHYSICAL.
// \param ui32Index is the zero-based index of the descriptor that is being
// requested.
//
// This function parses the supplied HID descriptor to find the index into the
// sClassDescriptor array that corresponds to the requested descriptor. If
// a descriptor with the requested index does not exist, HID_NOT_FOUND will be
// returned unless the request is for a physical descriptor and at least one
// such descriptor exists. In this case, the index returned will be for the
// last physical descriptor (as required by the HID spec 7.1.1).
//
// \return Returns the index of the descriptor within the sClassDescriptor
// of the tHIDDevice structure if found or HID_NOT_FOUND otherwise.
//
//*****************************************************************************
static uint32_t
FindHIDDescriptor(const tUSBDHIDDevice *psHIDDevice, uint8_t ui8Type,
uint32_t ui32Index, uint32_t *pui32Len)
{
bool bFoundType;
uint32_t ui32Loop, ui32Count, ui32LastFound;
const tHIDClassDescriptorInfo *psDesc;
//
// Remember that we have not found any descriptor with a matching type yet.
//
bFoundType = false;
ui32Count = 0;
ui32LastFound = 0;
//
// Walk through all the class descriptors looking for the one which
// matches the requested index and type.
//
for(ui32Loop = 0; ui32Loop < psHIDDevice->psHIDDescriptor->bNumDescriptors;
ui32Loop++)
{
psDesc = &(psHIDDevice->psHIDDescriptor->sClassDescriptor[ui32Loop]);
if(psDesc->bDescriptorType == ui8Type)
{
//
// We found a descriptor of the correct type. Is this the
// correct index?
//
bFoundType = true;
//
// Is this the descriptor we are looking for?
//
if(ui32Count == ui32Index)
{
//
// Yes - we found it so return the index and size to the
// caller.
//
#ifdef __TMS320C28XX__
*pui32Len = (uint32_t)readusb16_t(&(psDesc->wDescriptorLength));
#else
*pui32Len = (uint32_t)psDesc->wDescriptorLength;
#endif
return(ui32Loop);
}
else
{
//
// Update our count and keep looking. Remember where we were
// when we found this descriptor in case we need to return the
// last physical descriptor.
//
ui32Count++;
ui32LastFound = ui32Loop;
}
}
}
//
// If we drop out, we did not find the requested descriptor. Now handle
// the special case of a physical descriptor - if we found any physical
// descriptors, return the last one.
//
if((ui8Type == USB_HID_DTYPE_PHYSICAL) && bFoundType)
{
//
// Get the length of the last descriptor we found.
//
psDesc =
&(psHIDDevice->psHIDDescriptor->sClassDescriptor[ui32LastFound]);
#ifdef __TMS320C28XX__
*pui32Len = (uint32_t)readusb16_t(&(psDesc->wDescriptorLength));
#else
*pui32Len = (uint32_t)psDesc->wDescriptorLength;
#endif
//
// Return the index to the caller.
//
return(ui32LastFound);
}
else
{
//
// We could not find the descriptor so return an appropriate error.
//
return(HID_NOT_FOUND);
}
}
//*****************************************************************************
//
// Schedule transmission of the next packet forming part of an input report.
//
// \param psHIDInst points to the HID device instance whose input report is to
// be sent.
//
// This function is called to transmit the next packet of an input report
// passed to the driver via a call to USBDHIDReportWrite. If any data remains
// to be sent, a USB packet is written to the FIFO and scheduled for
// transmission to the host. The function ensures that reports are sent as
// a sequence of full packets followed by either a single int16_t packet or a
// packet with no data to indicate the end of the transaction.
//
//*****************************************************************************
static int32_t
ScheduleReportTransmission(tHIDInstance *psHIDInst)
{
uint32_t ui32NumBytes;
uint8_t *pui8Data;
int32_t i32Retcode;
//
// Set the number of bytes to send this iteration.
//
ui32NumBytes = (uint32_t)(psHIDInst->ui16InReportSize -
psHIDInst->ui16InReportIndex);
//
// Limit individual transfers to the maximum packet size for the endpoint.
//
if(ui32NumBytes > USBDHID_MAX_PACKET)
{
ui32NumBytes = USBDHID_MAX_PACKET;
}
//
// Where are we sending this data from?
//
pui8Data = psHIDInst->pui8InReportData + psHIDInst->ui16InReportIndex;
//
// Put the data in the correct FIFO.
//
i32Retcode = USBEndpointDataPut(psHIDInst->ui32USBBase,
psHIDInst->ui8INEndpoint,
pui8Data, ui32NumBytes);
if(i32Retcode != -1)
{
//
// Update the count and index ready for the next time round.
//
psHIDInst->ui16InReportIndex += ui32NumBytes;
//
// Send out the current data.
//
i32Retcode = USBEndpointDataSend(psHIDInst->ui32USBBase,
psHIDInst->ui8INEndpoint,
USB_TRANS_IN);
}
//
// Tell the caller how we got on.
//
return(i32Retcode);
}
//*****************************************************************************
//
// Receives notifications related to data received from the host.
//
// \param psHIDDevice is the device instance whose endpoint is to be processed.
// \param ui32Status is the USB interrupt status that caused this function to
// be called.
//
// This function is called from HandleEndpoints for all interrupts signaling
// the arrival of data on the interrupt OUT endpoint (in other words, whenever
// the host has sent us a packet of data). We inform the client that a packet
// is available and, on return, check to see if the packet has been read. If
// not, we schedule another notification to the client for a later time.
//
// \return Returns \b true on success or \b false on failure.
//
//*****************************************************************************
static bool
ProcessDataFromHost(tUSBDHIDDevice *psHIDDevice, uint32_t ui32Status)
{
uint32_t ui32EPStatus, ui32Size;
tHIDInstance *psInst;
//
// Get a pointer to our instance data.
//
psInst = &psHIDDevice->sPrivateData;
//
// Get the endpoint status to see why we were called.
//
ui32EPStatus = USBEndpointStatus(USB_BASE, psInst->ui8OUTEndpoint);
//
// Clear the status bits.
//
USBDevEndpointStatusClear(USB_BASE, psInst->ui8OUTEndpoint,
ui32EPStatus);
//
// Has a packet been received?
//
if(ui32EPStatus & USB_DEV_RX_PKT_RDY)
{
//
// Set the flag we use to indicate that a packet read is pending. This
// will be cleared if the packet is read. If the client does not read
// the packet in the context of the USB_EVENT_RX_AVAILABLE callback,
// the event will be signaled later during tick processing.
//
SetDeferredOpFlag(&psInst->ui16DeferredOpFlags, HID_DO_PACKET_RX,
true);
//
// How big is the packet we have just been sent?
//
ui32Size = USBEndpointDataAvail(psInst->ui32USBBase,
psInst->ui8OUTEndpoint);
//
// The receive channel is not blocked so let the caller know
// that a packet is waiting. The parameters are set to indicate
// that the packet has not been read from the hardware FIFO yet.
//
psHIDDevice->pfnRxCallback(psHIDDevice->pvRxCBData,
USB_EVENT_RX_AVAILABLE, ui32Size,
(void *)0);
}
else
{
//
// No packet was received. Some error must have been reported. Check
// and pass this on to the client if necessary.
//
if(ui32EPStatus & USB_RX_ERROR_FLAGS)
{
//
// This is an error we report to the client so...
//
psHIDDevice->pfnRxCallback(psHIDDevice->pvRxCBData,
USB_EVENT_ERROR,
(ui32EPStatus & USB_RX_ERROR_FLAGS),
(void *)0);
}
return(false);
}
return(true);
}
//*****************************************************************************
//
// Receives notifications related to data sent to the host.
//
// \param psHIDDevice is the device instance whose endpoint is to be processed.
// \param ui32Status is the USB interrupt status that caused this function to
// be called.
//
// This function is called from HandleEndpoints for all interrupts originating
// from the interrupt IN endpoint (in other words, whenever data has been
// transmitted to the USB host). We examine the cause of the interrupt and,
// if due to completion of a transmission, notify the client.
//
// \return Returns \b true on success or \b false on failure.
//
//*****************************************************************************
static bool
ProcessDataToHost(tUSBDHIDDevice *psHIDDevice, uint32_t ui32Status)
{
tHIDInstance *psInst;
uint32_t ui32EPStatus;
//
// Get a pointer to our instance data.
//
psInst = &psHIDDevice->sPrivateData;
//
// Get the endpoint status to see why we were called.
//
ui32EPStatus = USBEndpointStatus(psInst->ui32USBBase,
psInst->ui8INEndpoint);
//
// Clear the status bits.
//
USBDevEndpointStatusClear(psInst->ui32USBBase, psInst->ui8INEndpoint,
ui32EPStatus);
//
// Our last packet was transmitted successfully. Is there any more data to
// send or have we finished sending the whole report? We know we finished
// if the ui16InReportIndex has reached the ui16InReportSize value.
//
if(psInst->ui16InReportSize == psInst->ui16InReportIndex)
{
//
// We finished sending the last report so are idle once again.
//
psInst->iHIDTxState = eHIDStateIdle;
//
// Notify the client that the report transmission completed.
//
psHIDDevice->pfnTxCallback(psHIDDevice->pvTxCBData,
USB_EVENT_TX_COMPLETE,
psInst->ui16InReportSize, (void *)0);
//
// Do we have any reports to send as a result of idle timer timeouts?
//
if(psInst->ui16DeferredOpFlags & ((uint32_t)1 << HID_DO_SEND_IDLE_REPORT))
{
//
// Yes - send reports for any timers that expired recently.
//
ProcessIdleTimers(psHIDDevice, 0);
}
}
else
{
//
// There must be more data or a zero length packet waiting to be sent
// so go ahead and do this.
//
ScheduleReportTransmission(psInst);
}
return(true);
}
//*****************************************************************************
//
// Called by the USB stack for any activity involving one of our endpoints
// other than EP0. This function is a fan out that merely directs the call to
// the correct handler depending upon the endpoint and transaction direction
// signaled in ui32Status.
//
//*****************************************************************************
static void
HandleEndpoints(void *pvHIDInstance, uint32_t ui32Status)
{
tUSBDHIDDevice *psHIDInst;
tHIDInstance *psInst;
ASSERT(pvHIDInstance != 0);
//
// Determine if the serial device is in single or composite mode because
// the meaning of ui32Index is different in both cases.
//
psHIDInst = (tUSBDHIDDevice *)pvHIDInstance;
psInst = &psHIDInst->sPrivateData;
//
// Handler for the interrupt OUT data endpoint.
//
if(ui32Status & ((uint32_t)0x10000 << USBEPToIndex(psInst->ui8OUTEndpoint)))
{
//
// Data is being sent to us from the host.
//
ProcessDataFromHost(pvHIDInstance, ui32Status);
}
//
// Handler for the interrupt IN data endpoint.
//
if(ui32Status & ((uint32_t)1 << USBEPToIndex(psInst->ui8INEndpoint)))
{
ProcessDataToHost(pvHIDInstance, ui32Status);
}
}
//*****************************************************************************
//
// Called by the USB stack whenever a configuration change occurs.
//
//*****************************************************************************
static void
HandleConfigChange(void *pvHIDInstance, uint32_t ui32Info)
{
tHIDInstance *psInst;
tUSBDHIDDevice *psHIDDevice;
ASSERT(pvHIDInstance != 0);
//
// Create the instance pointer.
//
psHIDDevice = pvHIDInstance;
//
// Get a pointer to our instance data.
//
psInst = &psHIDDevice->sPrivateData;
//
// Set all our endpoints to idle state.
//
psInst->iHIDRxState = eHIDStateIdle;
psInst->iHIDTxState = eHIDStateIdle;
//
// If we are not currently connected let the client know we are open for
// business.
//
if(!psInst->bConnected)
{
//
// Pass the connected event to the client.
//
psHIDDevice->pfnRxCallback(psHIDDevice->pvRxCBData,
USB_EVENT_CONNECTED, 0, (void *)0);
}
//
// Clear the idle timers for each input report.
//
ClearIdleTimers(psHIDDevice);
//
// Remember that we are connected.
//
psInst->bConnected = true;
}
//*****************************************************************************
//
// Device instance specific handler.
//
//*****************************************************************************
static void
HandleDevice(void *pvHIDInstance, uint32_t ui32Request, void *pvRequestData)
{
tHIDInstance *psInst;
uint8_t *pui8Data;
//
// Create the serial instance data.
//
psInst = &((tUSBDHIDDevice *)pvHIDInstance)->sPrivateData;
//
// Create the int8_t array used by the events supported by the USB CDC
// serial class.
//
pui8Data = (uint8_t *)pvRequestData;
switch(ui32Request)
{
//
// This was an interface change event.
//
case USB_EVENT_COMP_IFACE_CHANGE:
{
psInst->ui8Interface = pui8Data[1];
break;
}
//
// This was an endpoint change event.
//
case USB_EVENT_COMP_EP_CHANGE:
{
//
// Determine if this is an IN or OUT endpoint that has changed.
//
if(pui8Data[0] & USB_EP_DESC_IN)
{
psInst->ui8INEndpoint = IndexToUSBEP((pui8Data[1] & 0x7f));
}
else
{
//
// Extract the new endpoint number.
//
psInst->ui8OUTEndpoint = IndexToUSBEP(pui8Data[1] & 0x7f);
}
break;
}
default:
{
break;
}
}
}
//*****************************************************************************
//
// This function is called by the USB device stack whenever the device is
// disconnected from the host.
//
//*****************************************************************************
static void
HandleDisconnect(void *pvHIDInstance)
{
tUSBDHIDDevice *psHIDDevice;
ASSERT(pvHIDInstance != 0);
//
// Create the instance pointer.
//
psHIDDevice = (tUSBDHIDDevice *)pvHIDInstance;
//
// If we are not currently connected so let the client know we are open
// for business.
//
if(psHIDDevice->sPrivateData.bConnected)
{
//
// Pass the disconnected event to the client.
//
psHIDDevice->pfnRxCallback(psHIDDevice->pvRxCBData,
USB_EVENT_DISCONNECTED, 0, (void *)0);
}
//
// Remember that we are no longer connected.
//
psHIDDevice->sPrivateData.bConnected = false;
}
//*****************************************************************************
//
// This function is called by the USB device stack whenever a request for a
// non-standard descriptor is received.
//
// \param pvHIDInstance is the instance data for this request.
// \param psUSBRequest points to the request received.
//
// This call parses the provided request structure and determines which
// descriptor is being requested. Assuming the descriptor can be found, it is
// scheduled for transmission via endpoint zero. If the descriptor cannot be
// found, the endpoint is stalled to indicate an error to the host.
//
//*****************************************************************************
static void
HandleGetDescriptor(void *pvHIDInstance, tUSBRequest *psUSBRequest)
{
uint32_t ui32Size, ui32Desc;
const tUSBDHIDDevice *psHIDDevice;
ASSERT(pvHIDInstance != 0);
//
// Which device are we dealing with?
//
psHIDDevice = pvHIDInstance;
//
// Which type of class descriptor are we being asked for?
//
#ifdef __TMS320C28XX__
switch(readusb16_t(&(psUSBRequest->wValue)) >> 8)
#else
switch(psUSBRequest->wValue >> 8)
#endif
{
//
// This is a request for a HID report or physical descriptor.
//
case USB_HID_DTYPE_REPORT:
case USB_HID_DTYPE_PHYSICAL:
{
//
// Find the index to the descriptor that is being queried.
//
ui32Size = 0;
ui32Desc = FindHIDDescriptor(psHIDDevice,
#ifdef __TMS320C28XX__
readusb16_t(&(psUSBRequest->wValue)) >> 8,
readusb16_t(&(psUSBRequest->wValue)) & 0xFF,
#else
psUSBRequest->wValue >> 8,
psUSBRequest->wValue & 0xFF,
#endif
&ui32Size);
//
// Did we find the descriptor?
//
if(ui32Desc == HID_NOT_FOUND)
{
//
// No - stall the endpoint and return.
//
USBDCDStallEP0(0);
return;
}
//
// If there is more data to send than the host requested then just
// send the requested amount of data.
//
#ifdef __TMS320C28XX__
if(ui32Size > readusb16_t(&(psUSBRequest->wLength)))
{
ui32Size = readusb16_t(&(psUSBRequest->wLength));
#else
if(ui32Size > psUSBRequest->wLength)
{
ui32Size = psUSBRequest->wLength;
#endif
}
//
// Send the data via endpoint 0.
//
USBDCDSendDataEP0(0,
(uint8_t *)psHIDDevice->ppui8ClassDescriptors[ui32Desc],
ui32Size);
break;
}
//
// This is a request for the HID descriptor (as found in the
// configuration descriptor following the relevant interface).
//
case USB_HID_DTYPE_HID:
{
//
// How big is the HID descriptor?
//
ui32Size = (uint32_t)psHIDDevice->psHIDDescriptor->bLength;
//
// If there is more data to send than the host requested then just
// send the requested amount of data.
//
#ifdef __TMS320C28XX__
if(ui32Size > readusb16_t(&(psUSBRequest->wLength)))
{
ui32Size = readusb16_t(&(psUSBRequest->wLength));
#else
if(ui32Size > psUSBRequest->wLength)
{
ui32Size = psUSBRequest->wLength;
#endif
}
//
// Send the data via endpoint 0.
//
USBDCDSendDataEP0(0, (uint8_t *)psHIDDevice->psHIDDescriptor,
ui32Size);
break;
}
//
// This was an unknown request so stall.
//
default:
{
USBDCDStallEP0(0);
break;
}
}
}
//*****************************************************************************
//
// This function is called by the USB device stack whenever a non-standard
// request is received.
//
// \param pvHIDInstance is the instance data for this HID device.
// \param psUSBRequest points to the request received.
//
// This call parses the provided request structure. Assuming the request is
// understood, it is handled and any required response generated. If the
// request cannot be handled by this device class, endpoint zero is stalled to
// indicate an error to the host.
//
//*****************************************************************************
static void
HandleRequest(void *pvHIDInstance, tUSBRequest *psUSBRequest)
{
tHIDInstance *psInst;
uint8_t ui8Protocol;
uint32_t ui32Size, ui32Timeout;
uint8_t *pui8Report;
tUSBDHIDDevice *psHIDDevice;
ASSERT(pvHIDInstance != 0);
//
// Which device are we dealing with?
//
psHIDDevice = pvHIDInstance;
//
// Get a pointer to our instance data.
//
psInst = &psHIDDevice->sPrivateData;
//
// Make sure the request was for this interface.
//
#ifdef __TMS320C28XX__
if(readusb16_t(&(psUSBRequest->wIndex)) != psInst->ui8Interface)
#else
if(psUSBRequest->wIndex != psInst->ui8Interface)
#endif
{
return;
}
//
// Determine the type of request.
//
switch(psUSBRequest->bRequest)
{
//
// A Set Report request is received from the host when it sends an
// Output report via endpoint 0.
//
case USBREQ_SET_REPORT:
{
//
// Ask the application for a buffer large enough to hold the
// report we are to be sent.
//
#ifdef __TMS320C28XX__
psInst->ui16OutReportSize = readusb16_t(&(psUSBRequest->wLength));
#else
psInst->ui16OutReportSize = psUSBRequest->wLength;
#endif
psInst->pui8OutReportData =
(uint8_t *)psHIDDevice->pfnRxCallback(
psHIDDevice->pvRxCBData,
USBD_HID_EVENT_GET_REPORT_BUFFER,
#ifdef __TMS320C28XX__
readusb16_t(&(psUSBRequest->wValue)),
(void *)(uint32_t)(readusb16_t(&(psUSBRequest->wLength))));
#else
psUSBRequest->wValue,
(void *)(uint32_t)(psUSBRequest->wLength));
#endif
//
// Did the client provide us a buffer?
//
if(!psInst->pui8OutReportData)
{
//
// The application could not provide us a buffer so stall the
// request.
//
USBDCDStallEP0(0);
}
else
{
//
// The client provided us a buffer to read the report into
// so request the data from the host.
//
//
// Set the state to indicate we are waiting for data.
//
psInst->iHIDRxState = eHIDStateWaitData;
//
// Now read the payload of the request. We handle the actual
// operation in the data callback once this data is received.
//
USBDCDRequestDataEP0(0, psInst->pui8OutReportData,
#ifdef __TMS320C28XX__
(uint32_t)readusb16_t(&(psUSBRequest->wLength)));
#else
(uint32_t)psUSBRequest->wLength);
#endif
//
// Need to ACK the data on end point 0 in this case. Do this
// after requesting the data to prevent race conditions that
// occur if you acknowledge before setting up to receive the
// request data.
//
USBDevEndpointDataAck(psInst->ui32USBBase, USB_EP_0, false);
}
break;
}
//
// A Get Report request is used by the host to poll a device for its
// current state.
//
case USBREQ_GET_REPORT:
{
//
// Get the latest report from the application.
//
ui32Size = psHIDDevice->pfnRxCallback(psHIDDevice->pvRxCBData,
USBD_HID_EVENT_GET_REPORT,
#ifdef __TMS320C28XX__
readusb16_t(&(psUSBRequest->wValue)), &pui8Report);
#else
psUSBRequest->wValue, &pui8Report);
#endif
//
// Need to ACK the data on end point 0 in this case.
//
USBDevEndpointDataAck(psInst->ui32USBBase, USB_EP_0, true);
//
// ..then send back the requested report.
//
psInst->bGetRequestPending = true;
USBDCDSendDataEP0(0, pui8Report, ui32Size);
break;
}
//
// A set IDLE request has been made. This indicates to us how often a
// given report should be sent back to the host in the absence of any
// change in state of the device.
//
case USBREQ_SET_IDLE:
{
//
// Set the idle timeout for the requested report(s).
//
#ifdef __TMS320C28XX__
SetIdleTimeout(psHIDDevice, readusb16_t(&(psUSBRequest->wValue)) & 0xFF,
(readusb16_t(&(psUSBRequest->wValue)) >> 8) & 0xFF);
#else
SetIdleTimeout(psHIDDevice, psUSBRequest->wValue & 0xFF,
(psUSBRequest->wValue >> 8) & 0xFF);
#endif
//
// Need to ACK the data on end point 0 in this case.
//
USBDevEndpointDataAck(psInst->ui32USBBase, USB_EP_0, true);
break;
}
//
// A get IDLE request has been made. This request queries the current
// idle timeout for a given report.
//
case USBREQ_GET_IDLE:
{
//
// Determine the timeout for the requested report.
//
#ifdef __TMS320C28XX__
ui32Timeout = GetIdleTimeout(psHIDDevice, readusb16_t(&(psUSBRequest->wValue)));
#else
ui32Timeout = GetIdleTimeout(psHIDDevice, psUSBRequest->wValue);
#endif
if(ui32Timeout != HID_NOT_FOUND)
{
//
// Need to ACK the data on end point 0 in this case.
//
USBDevEndpointDataAck(psInst->ui32USBBase, USB_EP_0, true);
//
// Send our response to the host.
//
USBDCDSendDataEP0(0, (uint8_t *)&ui32Timeout, 1);
}
else
{
//
// The report ID was not found so stall the endpoint.
//
USBDCDStallEP0(0);
}
break;
}
//
// Set either boot or report protocol for reports sent from the device.
// This is only supported by devices in the boot subclass.
//
case USBREQ_SET_PROTOCOL:
{
if(psHIDDevice->ui8Subclass == USB_HID_SCLASS_BOOT)
{
//
// We need to ACK the data on end point 0 in this case.
//
USBDevEndpointDataAck(psInst->ui32USBBase, USB_EP_0, true);
//
// We are a boot subclass device so pass this on to the
// application.
//
psHIDDevice->pfnRxCallback(psHIDDevice->pvRxCBData,
USBD_HID_EVENT_SET_PROTOCOL,
#ifdef __TMS320C28XX__
readusb16_t(&(psUSBRequest->wValue)),
#else
psUSBRequest->wValue,
#endif
(void *)0);
}
else
{
//
// This is not a boot subclass device so stall the endpoint to
// show that we don't support this request.
//
USBDCDStallEP0(0);
}
break;
}
//
// Inform the host of the protocol, boot or report, that is currently
// in use. This is only supported by devices in the boot subclass.
//
case USBREQ_GET_PROTOCOL:
{
if(psHIDDevice->ui8Subclass == USB_HID_SCLASS_BOOT)
{
//
// We need to ACK the data on end point 0 in this case.
//
USBDevEndpointDataAck(psInst->ui32USBBase, USB_EP_0, true);
//
// We are a boot subclass device so pass this on to the
// application callback to get the answer.
//
ui8Protocol = (uint8_t)psHIDDevice->pfnRxCallback(
psHIDDevice->pvRxCBData, USBD_HID_EVENT_GET_PROTOCOL, 0,
(void *)0);
//
// Send our response to the host.
//
USBDCDSendDataEP0(0, (uint8_t *)&ui8Protocol, 1);
}
else
{
//
// This is not a boot subclass device so stall the endpoint to
// show that we don't support this request.
//
USBDCDStallEP0(0);
}
break;
}
//
// This request was not recognized so stall.
//
default:
{
USBDCDStallEP0(0);
break;
}
}
}
//*****************************************************************************
//
// This function is called by the USB device stack whenever the data requested
// on endpoint zero is received.
//
//*****************************************************************************
static void
HandleEP0DataReceived(void *pvHIDInstance, uint32_t ui32DataSize)
{
tHIDInstance *psInst;
tUSBDHIDDevice *psHIDDevice;
ASSERT(pvHIDInstance != 0);
//
// Which device are we dealing with?
//
psHIDDevice = pvHIDInstance;
//
// If we were not passed any data, just return.
//
if(ui32DataSize == 0)
{
return;
}
//
// Get our instance data pointer.
//
psInst = &psHIDDevice->sPrivateData;
//
// Make sure we are actually expecting something.
//
if(psInst->iHIDRxState != eHIDStateWaitData)
{
return;
}
//
// Change the endpoint state back to idle now that we have been passed
// the data we were waiting for.
//
psInst->iHIDRxState = eHIDStateIdle;
//
// The only things we ever request via endpoint zero are reports sent to
// us via a Set_Report request. Pass the newly received report on to
// the client.
//
psHIDDevice->pfnRxCallback(psHIDDevice->pvRxCBData,
USBD_HID_EVENT_SET_REPORT,
psInst->ui16OutReportSize,
psInst->pui8OutReportData);
}
//*****************************************************************************
//
// This function is called by the USB device stack whenever the data sent on
// endpoint zero is received and acknowledged by the host.
//
//*****************************************************************************
static void
HandleEP0DataSent(void *pvHIDInstance, uint32_t ui32Info)
{
tHIDInstance *psInst;
tUSBDHIDDevice *psHIDDevice;
ASSERT(pvHIDInstance != 0);
//
// Which device are we dealing with?
//
psHIDDevice = pvHIDInstance;
//
// Get our instance data pointer.
//
psInst = &psHIDDevice->sPrivateData;
//
// If we just sent a report in response to a Get_Report request, send an
// event to the application telling it that the transmission completed.
//
if(psInst->bGetRequestPending)
{
//
// Clear the flag now that we are sending the application callback.
//
psInst->bGetRequestPending = false;
psHIDDevice->pfnRxCallback(psHIDDevice->pvRxCBData,
USBD_HID_EVENT_REPORT_SENT, 0, (void *)0);
}
return;
}
//*****************************************************************************
//
// This function is called by the USB device stack whenever the device is
// reset. If we are currently connected, send a disconnect event at this
// point.
//
//*****************************************************************************
static void
HandleReset(void *pvHIDInstance)
{
ASSERT(pvHIDInstance != 0);
//
// Merely call the disconnect handler. This causes a disconnect message to
// be sent to the client if we think we are currently connected.
//
HandleDisconnect(pvHIDInstance);
}
//*****************************************************************************
//
// This function is called by the USB device stack whenever the bus is put into
// suspend state.
//
//*****************************************************************************
static void
HandleSuspend(void *pvHIDInstance)
{
const tUSBDHIDDevice *psHIDDevice;
ASSERT(pvHIDInstance != 0);
//
// Create the instance pointer.
//
psHIDDevice = (const tUSBDHIDDevice *)pvHIDInstance;
//
// Pass the event on to the client.
//
psHIDDevice->pfnRxCallback(psHIDDevice->pvRxCBData, USB_EVENT_SUSPEND, 0,
(void *)0);
}
//*****************************************************************************
//
// This function is called by the USB device stack whenever the bus is taken
// out of suspend state.
//
//*****************************************************************************
static void
HandleResume(void *pvHIDInstance)
{
const tUSBDHIDDevice *psHIDDevice;
ASSERT(pvHIDInstance != 0);
//
// Create the instance pointer.
//
psHIDDevice = (const tUSBDHIDDevice *)pvHIDInstance;
//
// Pass the event on to the client.
//
psHIDDevice->pfnRxCallback(psHIDDevice->pvRxCBData, USB_EVENT_RESUME, 0,
(void *)0);
}
//*****************************************************************************
//
// This function is called periodically and provides us with a time reference
// and method of implementing delayed or time-dependent operations.
//
// \param pvHIDInstance is the instance data for this request.
// \param ui32TimemS is the elapsed time in milliseconds since the last call
// to this function.
//
// \return None.
//
//*****************************************************************************
static void
HIDTickHandler(void *pvHIDInstance, uint32_t ui32TimemS)
{
tHIDInstance *psInst;
uint32_t ui32Size;
tUSBDHIDDevice *psHIDDevice;
ASSERT(pvHIDInstance != 0);
//
// Create the instance pointer.
//
psHIDDevice = (tUSBDHIDDevice *)pvHIDInstance;
//
// Get our instance data pointer.
//
psInst = &psHIDDevice->sPrivateData;
//
// If we are connected, process our idle timers.
//
if(psInst->bConnected)
{
ProcessIdleTimers(psHIDDevice, ui32TimemS);
}
//
// Do we have a deferred receive waiting
//
if(psInst->ui16DeferredOpFlags & ((uint32_t)1 << HID_DO_PACKET_RX))
{
//
// Yes - how big is the waiting packet?
//
ui32Size = USBEndpointDataAvail(USB_BASE, psInst->ui8OUTEndpoint);
//
// Tell the client that there is a packet waiting for it.
//
psHIDDevice->pfnRxCallback(psHIDDevice->pvRxCBData,
USB_EVENT_RX_AVAILABLE, ui32Size,
(void *)0);
}
return;
}
//*****************************************************************************
//
//! Initializes HID device operation for a given USB controller.
//!
//! \param ui32Index is the index of the USB controller which is to be
//! initialized for HID device operation.
//! \param psHIDDevice points to a structure containing parameters customizing
//! the operation of the HID device.
//!
//! An application wishing to offer a USB HID interface to a host system
//! must call this function to initialize the USB controller and attach the
//! device to the USB bus. This function performs all required USB
//! initialization.
//!
//! On successful completion, this function will return the \e psHIDDevice
//! pointer passed to it. This must be passed on all future calls from the
//! application to the HID device class driver.
//!
//! The USB HID device class API offers the application a report-based transmit
//! interface for Input reports. Output reports may be received via the
//! control endpoint or via a dedicated Interrupt OUT endpoint. If using the
//! dedicated endpoint, report data is delivered to the application packet-by-
//! packet. If the application uses reports longer than \b USBDHID_MAX_PACKET
//! bytes and would rather receive full reports, it may use a USB buffer above
//! the receive channel to allow full reports to be read.
//!
//! Transmit Operation:
//!
//! Calls to USBDHIDReportWrite() pass complete reports to the driver for
//! transmission. These will be transmitted to the host using as many USB
//! packets as are necessary to complete the transmission.
//!
//! Once a full Input report has been acknowledged by the USB host, a
//! \b USB_EVENT_TX_COMPLETE event is sent to the application transmit callback
//! to inform it that another report may be transmitted.
//!
//! Receive Operation (when using a dedicated interrupt OUT endpoint):
//!
//! An incoming USB data packet will result in a call to the application
//! callback with event \b USB_EVENT_RX_AVAILABLE. The application must then
//! call USBDHIDPacketRead(), passing a buffer capable of holding the received
//! packet. The size of the packet may be determined by calling function
//! USBDHIDRxPacketAvailable() prior to reading the packet.
//!
//! Receive Operation (when not using a dedicated OUT endpoint):
//!
//! If no dedicated OUT endpoint is used, Output and Feature reports are sent
//! from the host using the control endpoint, endpoint zero. When such a
//! report is received, \b USBD_HID_EVENT_GET_REPORT_BUFFER is sent to the
//! application which must respond with a buffer large enough to hold the
//! report. The device class driver will then copy the received report into
//! the supplied buffer before sending \b USBD_HID_EVENT_SET_REPORT to indicate
//! that the report is now available.
//!
//! \note The application must not make any calls to the low level USB device
//! interface if interacting with USB via the USB HID device class API. Doing
//! so will cause unpredictable (though almost certainly unpleasant) behavior.
//!
//! \return Returns NULL on failure or the \e psHIDDevice pointer on success.
//
//*****************************************************************************
void *
USBDHIDInit(uint32_t ui32Index, tUSBDHIDDevice *psHIDDevice)
{
tDeviceDescriptor *pi16DevDesc;
//
// Check parameter validity.
//
ASSERT(ui32Index == 0);
ASSERT(psHIDDevice);
ASSERT(psHIDDevice->ppui8StringDescriptors);
ASSERT(psHIDDevice->pfnRxCallback);
ASSERT(psHIDDevice->pfnTxCallback);
ASSERT(psHIDDevice->ppui8ClassDescriptors);
ASSERT(psHIDDevice->psHIDDescriptor);
ASSERT((psHIDDevice->ui8NumInputReports == 0) || psHIDDevice->psReportIdle);
USBDHIDCompositeInit(ui32Index, psHIDDevice, 0);
//
// Fix up the device descriptor with the client-supplied values.
//
pi16DevDesc = (tDeviceDescriptor *)psHIDDevice->sPrivateData.sDevInfo.pui8DeviceDescriptor;
#ifdef __TMS320C28XX__
writeusb16_t(&(pi16DevDesc->idVendor), psHIDDevice->ui16VID);
writeusb16_t(&(pi16DevDesc->idProduct), psHIDDevice->ui16PID);
#else
pi16DevDesc->idVendor = psHIDDevice->ui16VID;
pi16DevDesc->idProduct = psHIDDevice->ui16PID;
#endif
//
// All is well so now pass the descriptors to the lower layer and put
// the HID device on the bus.
//
USBDCDInit(ui32Index, &psHIDDevice->sPrivateData.sDevInfo,
(void *)psHIDDevice);
//
// Return the pointer to the instance indicating that everything went well.
//
return((void *)psHIDDevice);
}
//*****************************************************************************
//
//! Initializes HID device operation for a given USB controller.
//!
//! \param ui32Index is the index of the USB controller which is to be
//! initialized for HID device operation.
//! \param psHIDDevice points to a structure containing parameters customizing
//! the operation of the HID device.
//! \param psCompEntry is the composite device entry to initialize when
//! creating a composite device.
//!
//! USB HID device classes call this function to initialize the lower level
//! HID interface in the USB controller. If this HID device device is part of
//! a composite device, then the \e psCompEntry should point to the composite
//! device entry to initialize. This is part of the array that is passed to
//! the USBDCompositeInit() function.
//!
//! \return Returns zero on failure or a non-zero instance value that should be
//! used with the remaining USB HID APIs.
//
//*****************************************************************************
void *
USBDHIDCompositeInit(uint32_t ui32Index, tUSBDHIDDevice *psHIDDevice,
tCompositeEntry *psCompEntry)
{
tHIDInstance *psInst;
tEndpointDescriptor *psEndpoint;
//
// Check parameter validity.
//
ASSERT(ui32Index == 0);
ASSERT(psHIDDevice);
ASSERT(psHIDDevice->ppsConfigDescriptor);
ASSERT(psHIDDevice->ppui8StringDescriptors);
ASSERT(psHIDDevice->pfnRxCallback);
ASSERT(psHIDDevice->pfnTxCallback);
ASSERT(psHIDDevice->ppui8ClassDescriptors);
ASSERT(psHIDDevice->psHIDDescriptor);
ASSERT((psHIDDevice->ui8NumInputReports == 0) || psHIDDevice->psReportIdle);
//
// Initialize the workspace in the passed instance structure.
//
psInst = &psHIDDevice->sPrivateData;
//
// Initialize the device information structure.
//
psInst->sDevInfo.psCallbacks = &g_sHIDHandlers;
psInst->sDevInfo.pui8DeviceDescriptor = g_pui8HIDDeviceDescriptor;
psInst->sDevInfo.ppsConfigDescriptors = psHIDDevice->ppsConfigDescriptor;
psInst->sDevInfo.ppui8StringDescriptors =
psHIDDevice->ppui8StringDescriptors;
psInst->sDevInfo.ui32NumStringDescriptors =
psHIDDevice->ui32NumStringDescriptors;
//
// Default the endpoints zero before looking for them in the configuration
// descriptor.
//
psInst->ui8Interface = 0;
psInst->ui8INEndpoint = 0;
psInst->ui8OUTEndpoint = 0;
//
// Get the first endpoint descriptor on interface 0.
//
psEndpoint =
USBDCDConfigGetInterfaceEndpoint(psHIDDevice->ppsConfigDescriptor[0],
psInst->ui8Interface, 0, 0);
if(psEndpoint)
{
if(psEndpoint->bEndpointAddress & 0x80)
{
psInst->ui8INEndpoint = IndexToUSBEP(psEndpoint->bEndpointAddress);
}
else
{
psInst->ui8OUTEndpoint = IndexToUSBEP(psEndpoint->bEndpointAddress);
}
}
//
// Get the second endpoint descriptor on interface 0.
//
psEndpoint =
USBDCDConfigGetInterfaceEndpoint(psHIDDevice->ppsConfigDescriptor[0],
psInst->ui8Interface, 0, 1);
if(psEndpoint)
{
if(psEndpoint->bEndpointAddress & 0x80)
{
psInst->ui8INEndpoint = IndexToUSBEP(psEndpoint->bEndpointAddress);
}
else
{
psInst->ui8OUTEndpoint = IndexToUSBEP(psEndpoint->bEndpointAddress);
}
}
//
// Must have at least an IN endpoint.
//
if(psInst->ui8INEndpoint == 0)
{
return((void *)0);
}
//
// Initialize the composite entry that is used by the composite device
// class.
//
if(psCompEntry != 0)
{
psCompEntry->psDevInfo = &psInst->sDevInfo;
psCompEntry->pvInstance = (void *)psHIDDevice;
}
psInst->ui32USBBase = USB_BASE;
psInst->iHIDRxState = eHIDStateUnconfigured;
psInst->iHIDTxState = eHIDStateUnconfigured;
psInst->ui16DeferredOpFlags = 0;
psInst->bConnected = false;
psInst->bGetRequestPending = false;
psInst->bSendInProgress = false;
psInst->ui16InReportIndex = 0;
psInst->ui16InReportSize = 0;
psInst->pui8InReportData = (uint8_t *)0;
psInst->ui16OutReportSize = 0;
psInst->pui8OutReportData = (uint8_t *)0;
//
// Initialize the device info structure for the HID device.
//
USBDCDDeviceInfoInit(0, &psInst->sDevInfo);
//
// Initialize the input report idle timers if any input reports exist.
//
ClearIdleTimers(psHIDDevice);
//
// Initialize the USB tick module, this will prevent it from being
// initialized later in the call to USBDCDInit();
//
InternalUSBTickInit();
//
// Register our tick handler (this must be done after USBDCDInit).
//
InternalUSBRegisterTickHandler(HIDTickHandler, (void *)psHIDDevice);
//
// Return the pointer to the instance indicating that everything went well.
//
return((void *)psHIDDevice);
}
//*****************************************************************************
//
//! Shuts down the HID device.
//!
//! \param pvHIDInstance is the pointer to the device instance structure as
//! returned by USBDHIDInit().
//!
//! This function terminates HID operation for the instance supplied and
//! removes the device from the USB bus. This function should not be called
//! if the HID device is part of a composite device and instead the
//! USBDCompositeTerm() function should be called for the full composite
//! device.
//!
//! Following this call, the \e pvHIDInstance instance should not me used in
//! any other calls.
//!
//! \return None.
//
//*****************************************************************************
void
USBDHIDTerm(void *pvHIDInstance)
{
tHIDInstance *psInst;
ASSERT(pvHIDInstance);
//
// Get a pointer to our instance data.
//
psInst = &((tUSBDHIDDevice *)pvHIDInstance)->sPrivateData;
//
// Terminate the requested instance.
//
USBDCDTerm(USBBaseToIndex(psInst->ui32USBBase));
psInst->ui32USBBase = 0;
}
//*****************************************************************************
//
//! Sets the client-specific pointer parameter for the receive channel
//! callback.
//!
//! \param pvHIDInstance is the pointer to the device instance structure as
//! returned by USBDHIDInit().
//! \param pvCBData is the pointer that client wishes to be provided on each
//! event sent to the receive channel callback function.
//!
//! The client uses this function to change the callback pointer passed in
//! the first parameter on all callbacks to the \e pfnRxCallback function
//! passed on USBDHIDInit().
//!
//! If a client wants to make runtime changes in the callback pointer, it must
//! ensure that the pvHIDInstance structure passed to USBDHIDInit() resides in
//! RAM. If this structure is in flash, callback data changes will not be
//! possible.
//!
//! \return Returns the previous callback pointer that was being used for
//! this instance's receive callback.
//
//*****************************************************************************
void *
USBDHIDSetRxCBData(void *pvHIDInstance, void *pvCBData)
{
void *pvOldValue;
ASSERT(pvHIDInstance);
//
// Set the callback data for the receive channel after remembering the
// previous value.
//
pvOldValue = ((tUSBDHIDDevice *)pvHIDInstance)->pvRxCBData;
((tUSBDHIDDevice *)pvHIDInstance)->pvRxCBData = pvCBData;
//
// Return the previous callback data value.
//
return(pvOldValue);
}
//*****************************************************************************
//
//! Sets the client-specific data pointer for the transmit callback.
//!
//! \param pvHIDInstance is the pointer to the device instance structure as
//! returned by USBDHIDInit().
//! \param pvCBData is the pointer that client wishes to be provided on each
//! event sent to the transmit channel callback function.
//!
//! The client uses this function to change the callback data pointer passed in
//! the first parameter on all callbacks to the \e pfnTxCallback function
//! passed on USBDHIDInit().
//!
//! If a client wants to make runtime changes in the callback data, it must
//! ensure that the pvHIDInstance structure passed to USBDHIDInit() resides in
//! RAM. If this structure is in flash, callback data changes will not be
//! possible.
//!
//! \return Returns the previous callback data pointer that was being used for
//! this instance's transmit callback.
//
//*****************************************************************************
void *
USBDHIDSetTxCBData(void *pvHIDInstance, void *pvCBData)
{
void *pvOldValue;
ASSERT(pvHIDInstance);
//
// Set the callback data for the transmit channel after remembering the
// previous value.
//
pvOldValue = ((tUSBDHIDDevice *)pvHIDInstance)->pvTxCBData;
((tUSBDHIDDevice *)pvHIDInstance)->pvTxCBData = pvCBData;
//
// Return the previous callback data value.
//
return(pvOldValue);
}
//*****************************************************************************
//
//! Transmits a HID device report to the USB host via the HID interrupt IN
//! endpoint.
//!
//! \param pvHIDInstance is the pointer to the device instance structure as
//! returned by USBDHIDInit().
//! \param pi8Data points to the first byte of data which is to be transmitted.
//! \param ui32Length is the number of bytes of data to transmit.
//! \param bLast is ignored in this implementation. This parameter is required
//! to ensure compatibility with other device class drivers and USB buffers.
//!
//! This function schedules the supplied data for transmission to the USB
//! host in a single USB transaction using as many packets as it takes to send
//! all the data in the report. If no transmission is currently ongoing,
//! the first packet of data is immediately copied to the relevant USB endpoint
//! FIFO for transmission. Whenever all the report data has been acknowledged
//! by the host, a \b USB_EVENT_TX_COMPLETE event will be sent to the
//! application transmit callback indicating that another report can now be
//! transmitted.
//!
//! The caller must ensure that the data pointed to by \e pui8Data remains
//! accessible and unaltered until the \b USB_EVENT_TX_COMPLETE is received.
//!
//! \return Returns the number of bytes actually scheduled for transmission.
//! At this level, this will either be the number of bytes passed or 0 to
//! indicate a failure.
//
//*****************************************************************************
uint32_t
USBDHIDReportWrite(void *pvHIDInstance, uint8_t *pi8Data, uint32_t ui32Length,
bool bLast)
{
tHIDInstance *psInst;
int32_t i32Retcode;
ASSERT(pvHIDInstance);
//
// Get our instance data pointer
//
psInst = &((tUSBDHIDDevice *)pvHIDInstance)->sPrivateData;
//
// Set a flag indicating that we are currently in the process of sending
// a packet.
//
psInst->bSendInProgress = true;
//
// Can we send the data provided?
//
if(psInst->iHIDTxState != eHIDStateIdle)
{
//
// We are in the middle of sending another report. Return 0 to
// indicate that we can't send this report until the previous one
// finishes.
//
psInst->bSendInProgress = false;
return(0);
}
//
// Clear the elapsed time since this report was last sent.
//
if(ui32Length)
{
ClearReportTimer(pvHIDInstance, *pi8Data);
}
//
// Keep track of the whereabouts of the report so that we can send it in
// multiple packets if necessary.
//
psInst->pui8InReportData = pi8Data;
psInst->ui16InReportIndex = 0;
psInst->ui16InReportSize = ui32Length;
//
// Schedule transmission of the first packet of the report.
//
psInst->iHIDTxState = eHIDStateWaitData;
i32Retcode = ScheduleReportTransmission(psInst);
//
// Clear the flag we use to indicate that we are in the midst of sending
// a packet.
//
psInst->bSendInProgress = false;
//
// Did an error occur while trying to send the data?
//
if(i32Retcode != -1)
{
//
// No - tell the caller we sent all the bytes provided.
//
return(ui32Length);
}
else
{
//
// Yes - tell the caller we could not send the data.
//
return(0);
}
}
//*****************************************************************************
//
//! Reads a packet of data received from the USB host via the interrupt OUT
//! endpoint (if in use).
//!
//! \param pvHIDInstance is the pointer to the device instance structure as
//! returned by USBDHIDInit().
//! \param pi8Data points to a buffer into which the received data will be
//! written.
//! \param ui32Length is the size of the buffer pointed to by pi8Data.
//! \param bLast indicates whether the client will make a further call to
//! read additional data from the packet.
//!
//! This function reads up to \e ui32Length bytes of data received from the USB
//! host into the supplied application buffer. If the driver detects that the
//! entire packet has been read, it is acknowledged to the host.
//!
//! The \e bLast parameter is ignored in this implementation since the end of
//! a packet can be determined without relying upon the client to provide
//! this information.
//!
//! \return Returns the number of bytes of data read.
//
//*****************************************************************************
uint32_t
USBDHIDPacketRead(void *pvHIDInstance, uint8_t *pi8Data, uint32_t ui32Length,
bool bLast)
{
uint32_t ui32EPStatus, ui32Count, ui32Pkt;
tHIDInstance *psInst;
int32_t i32Retcode;
ASSERT(pvHIDInstance);
//
// Get our instance data pointer
//
psInst = &((tUSBDHIDDevice *)pvHIDInstance)->sPrivateData;
//
// Does the relevant endpoint FIFO have a packet waiting for us?
//
ui32EPStatus = USBEndpointStatus(psInst->ui32USBBase,
psInst->ui8OUTEndpoint);
if(ui32EPStatus & USB_DEV_RX_PKT_RDY)
{
//
// How many bytes are available for us to receive?
//
ui32Pkt = USBEndpointDataAvail(psInst->ui32USBBase,
psInst->ui8OUTEndpoint);
//
// Get as much data as we can.
//
ui32Count = ui32Length;
i32Retcode = USBEndpointDataGet(psInst->ui32USBBase,
psInst->ui8OUTEndpoint,
pi8Data, &ui32Count);
//
// Did we read the last of the packet data?
//
if(ui32Count == ui32Pkt)
{
//
// Clear the endpoint status so that we know no packet is
// waiting.
//
USBDevEndpointStatusClear(psInst->ui32USBBase,
psInst->ui8OUTEndpoint,
ui32EPStatus);
//
// Acknowledge the data, thus freeing the host to send the
// next packet.
//
USBDevEndpointDataAck(psInst->ui32USBBase,
psInst->ui8OUTEndpoint, true);
//
// Clear the flag we set to indicate that a packet read is
// pending.
//
SetDeferredOpFlag(&psInst->ui16DeferredOpFlags,
HID_DO_PACKET_RX, false);
}
//
// If all went well, tell the caller how many bytes they got.
//
if(i32Retcode != -1)
{
return(ui32Count);
}
}
//
// No packet was available or an error occurred while reading so tell
// the caller no bytes were returned.
//
return(0);
}
//*****************************************************************************
//
//! Returns the number of free bytes in the transmit buffer.
//!
//! \param pvHIDInstance is the pointer to the device instance structure as
//! returned by USBDHIDInit().
//!
//! This function indicates to the caller whether or not it is safe to send a
//! new report using a call to USBDHIDReportWrite(). The value returned will
//! be the maximum USB packet size (\b USBDHID_MAX_PACKET) if no transmission
//! is currently outstanding or 0 if a transmission is in progress. Since the
//! function USBDHIDReportWrite() can accept full reports longer than a single
//! USB packet, the caller should be aware that the returned value from this
//! class driver, unlike others, does not indicate the maximum size of report
//! that can be written but is merely an indication that another report can be
//! written.
//!
//! \return Returns 0 if an outgoing report is still being transmitted or
//! \b USBDHID_MAX_PACKET if no transmission is currently in progress.
//
//*****************************************************************************
uint32_t
USBDHIDTxPacketAvailable(void *pvHIDInstance)
{
tHIDInstance *psInst;
ASSERT(pvHIDInstance);
//
// Get our instance data pointer.
//
psInst = &((tUSBDHIDDevice *)pvHIDInstance)->sPrivateData;
//
// Do we have a packet transmission currently ongoing?
//
if(psInst->iHIDTxState != eHIDStateIdle)
{
//
// We are not ready to receive a new packet so return 0.
//
return(0);
}
else
{
//
// We can receive a packet so return the max packet size for the
// relevant endpoint.
//
return(USBDHID_MAX_PACKET);
}
}
//*****************************************************************************
//
//! Determines whether a packet is available and, if so, the size of the
//! buffer required to read it.
//!
//! \param pvHIDInstance is the pointer to the device instance structure as
//! returned by USBDHIDInit().
//!
//! This function may be used to determine if a received packet remains to be
//! read and allows the application to determine the buffer size needed to
//! read the data.
//!
//! \return Returns 0 if no received packet remains unprocessed or the
//! size of the packet if a packet is waiting to be read.
//
//*****************************************************************************
uint32_t
USBDHIDRxPacketAvailable(void *pvHIDInstance)
{
uint32_t ui32EPStatus, ui32Size;
tHIDInstance *psInst;
ASSERT(pvHIDInstance);
//
// Get our instance data pointer
//
psInst = &((tUSBDHIDDevice *)pvHIDInstance)->sPrivateData;
//
// Does the relevant endpoint FIFO have a packet waiting for us?
//
ui32EPStatus = USBEndpointStatus(psInst->ui32USBBase,
psInst->ui8OUTEndpoint);
if(ui32EPStatus & USB_DEV_RX_PKT_RDY)
{
//
// Yes - a packet is waiting. How big is it?
//
ui32Size = USBEndpointDataAvail(psInst->ui32USBBase,
psInst->ui8OUTEndpoint);
return(ui32Size);
}
else
{
//
// There is no packet waiting to be received.
//
return(0);
}
}
//*****************************************************************************
//
//! Reports the device power status (bus- or self-powered) to the USB library.
//!
//! \param pvHIDInstance is the pointer to the HID device instance structure.
//! \param ui8Power indicates the current power status, either
//! \b USB_STATUS_SELF_PWR or \b USB_STATUS_BUS_PWR.
//!
//! Applications which support switching between bus- or self-powered
//! operation should call this function whenever the power source changes
//! to indicate the current power status to the USB library. This information
//! is required by the USB library to allow correct responses to be provided
//! when the host requests status from the device.
//!
//! \return None.
//
//*****************************************************************************
void
USBDHIDPowerStatusSet(void *pvHIDInstance, uint8_t ui8Power)
{
ASSERT(pvHIDInstance);
//
// Pass the request through to the lower layer.
//
USBDCDPowerStatusSet(0, ui8Power);
}
//*****************************************************************************
//
//! Requests a remote wake up to resume communication when in suspended state.
//!
//! \param pvHIDInstance is the pointer to the HID device instance structure.
//!
//! When the bus is suspended, an application which supports remote wake up
//! (advertised to the host via the configuration descriptor) may call this
//! function to initiate remote wake up signaling to the host. If the remote
//! wake up feature has not been disabled by the host, this will cause the bus
//! to resume operation within 20mS. If the host has disabled remote wake up,
//! \b false will be returned to indicate that the wake up request was not
//! successful.
//!
//! \return Returns \b true if the remote wake up is not disabled and the
//! signaling was started or \b false if remote wake up is disabled or if
//! signaling is currently ongoing following a previous call to this function.
//
//*****************************************************************************
bool
USBDHIDRemoteWakeupRequest(void *pvHIDInstance)
{
ASSERT(pvHIDInstance);
//
// Pass the request through to the lower layer.
//
return(USBDCDRemoteWakeupRequest(0));
}
//*****************************************************************************
//
// Close the Doxygen group.
//! @}
//
//*****************************************************************************
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