/*
* Returns how many bytes are in the buffer are received and ready to be read.
*/
BYTE USBHID_bytesInUSBBuffer (BYTE intfNum)
{
BYTE bTmp1 = 0;
BYTE bTmp2;
BYTE edbIndex;
WORD state;
edbIndex = stUsbHandle[intfNum].edb_Index;
//interrupts disable
state = usbDisableOutEndpointInterrupt(edbIndex);
if ((bFunctionSuspended) ||
(bEnumerationStatus != ENUMERATION_COMPLETE)){
//if suspended or not enumerated - report 0 bytes available
usbRestoreOutEndpointInterrupt(state);
return (0);
}
if (HidReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp > 0){ //If a RX operation is underway, part of data may
//was read of the OEP buffer
bTmp1 = HidReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp;
if (*HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2 & EPBCNT_NAK){ //the next buffer has a valid data packet
bTmp2 = *(HidReadCtrl[INTFNUM_OFFSET(intfNum)].pEP2 + 1); //holds how many valid bytes in the EP buffer
if (bTmp2 >
(*HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2 & 0x7F) - 2){ //check if all data received correctly
bTmp1 +=
(*HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2 & 0x7F) - 2;
} else {
bTmp1 += bTmp2;
}
}
} else {
if (tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX & EPBCNT_NAK){ //this buffer has a valid data packet
bTmp2 = tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX & 0x7F;
bTmp1 = *((BYTE*)stUsbHandle[intfNum].oep_X_Buffer + 1);
if (bTmp2 - 2 < bTmp1){ //check if the count (second byte) is valid
bTmp1 = bTmp2 - 2;
}
}
if (tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY & EPBCNT_NAK){ //this buffer has a valid data packet
bTmp2 = tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY & 0x7F;
if (bTmp2 - 2 > *((BYTE*)stUsbHandle[intfNum].oep_Y_Buffer + 1)){ //check if the count (second byte) is valid
bTmp1 += *((BYTE*)stUsbHandle[intfNum].oep_Y_Buffer + 1);
} else {
bTmp1 += bTmp2 - 2;
}
}
}
//interrupts enable
usbRestoreOutEndpointInterrupt(state);
return (bTmp1);
}
/*
* Aborts an active receive operation on interface intfNum.
* Returns the number of bytes that were received and transferred
* to the data location established for this receive operation.
*/
uint8_t USBPHDC_abortReceive (uint16_t* size, uint8_t intfNum)
{
uint16_t state;
edbIndex = stUsbHandle[intfNum].edb_Index;
state = usbDisableOutEndpointInterrupt(edbIndex);
*size = 0; //set received bytes count to 0
//is receive operation underway?
if (PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer){
//how many bytes are already received?
*size = PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceive -
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceiveLeft;
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp = 0;
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer = NULL;
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceiveLeft = 0;
}
//restore interrupt status
usbRestoreOutEndpointInterrupt(state);
return (USB_SUCCEED);
}
/*
* Aborts an active receive operation on interface intfNum.
* Returns the number of bytes that were received and transferred
* to the data location established for this receive operation.
*/
BYTE USBCDC_abortReceive (WORD* size, BYTE intfNum)
{
//interrupts disable
BYTE edbIndex;
WORD state;
edbIndex = stUsbHandle[intfNum].edb_Index;
state = usbDisableOutEndpointInterrupt(edbIndex);
*size = 0; //set received bytes count to 0
//is receive operation underway?
if (CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer){
//how many bytes are already received?
*size = CdcReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceive -
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceiveLeft;
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp = 0;
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer = NULL;
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceiveLeft = 0;
}
//restore interrupt status
usbRestoreOutEndpointInterrupt(state);
return (kUSB_succeed);
}
/*
* This function indicates the status of the itnerface intfNum.
* If a send operation is active for this interface,
* the function also returns the number of bytes that have been transmitted to the host.
* If a receiver operation is active for this interface, the function also returns
* the number of bytes that have been received from the host and are waiting at the assigned address.
*
* returns kUSBPHDC_waitingForSend (indicates that a call to USBPHDC_SendData()
* has been made, for which data transfer has not been completed)
*
* returns kUSBPHDC_waitingForReceive (indicates that a receive operation
* has been initiated, but not all data has yet been received)
*
* returns kUSBPHDC_dataWaiting (indicates that data has been received
* from the host, waiting in the USB receive buffers)
*/
uint8_t USBPHDC_intfStatus (uint8_t intfNum, uint16_t* bytesSent, uint16_t* bytesReceived)
{
uint8_t ret = 0;
uint16_t stateIn, stateOut;
uint8_t edbIndex;
*bytesSent = 0;
*bytesReceived = 0;
edbIndex = stUsbHandle[intfNum].edb_Index;
stateIn = usbDisableInEndpointInterrupt(edbIndex);
stateOut = usbDisableOutEndpointInterrupt(edbIndex);
//Is send operation underway?
if (PHDCWriteCtrl[INTFNUM_OFFSET(intfNum)].nPHDCBytesToSendLeft != 0){
ret |= kUSBPHDC_waitingForSend;
*bytesSent = PHDCWriteCtrl[INTFNUM_OFFSET(intfNum)].nPHDCBytesToSend -
PHDCWriteCtrl[INTFNUM_OFFSET(intfNum)].
nPHDCBytesToSendLeft;
}
//Is receive operation underway?
if (PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer != NULL){
ret |= kUSBPHDC_waitingForReceive;
*bytesReceived =
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceive -
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceiveLeft;
} else { //receive operation not started
//do not access USB memory if suspended (PLL off). It may produce
//BUS_ERROR
if (!bFunctionSuspended){
if ((tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX &
EPBCNT_NAK) | //any of buffers has a valid data packet
(tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY &
EPBCNT_NAK)){
ret |= kUSBPHDC_dataWaiting;
}
}
}
if ((bFunctionSuspended) ||
(bEnumerationStatus != ENUMERATION_COMPLETE)){
//if suspended or not enumerated - report no other tasks pending
ret = kUSBPHDC_busNotAvailable;
}
//restore interrupt status
usbRestoreInEndpointInterrupt(stateIn);
usbRestoreOutEndpointInterrupt(stateOut);
__no_operation();
return (ret);
}
/*
* This function rejects payload data that has been received from the host.
*/
BYTE USBHID_rejectData (BYTE intfNum)
{
WORD state;
BYTE edbIndex;
edbIndex = stUsbHandle[intfNum].edb_Index;
state = usbDisableOutEndpointInterrupt(edbIndex);
//interrupts disable
//do not access USB memory if suspended (PLL off). It may produce BUS_ERROR
if (bFunctionSuspended){
usbRestoreOutEndpointInterrupt(state);
return (kUSBHID_busNotAvailable);
}
//Is receive operation underway?
//- do not flush buffers if any operation still active.
if (!HidReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer){
BYTE tmp1 = tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX &
EPBCNT_NAK;
BYTE tmp2 = tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY &
EPBCNT_NAK;
if (tmp1 ^ tmp2){ //switch current buffer if any and only ONE of the
//buffers is full
//switch current buffer
HidReadCtrl[INTFNUM_OFFSET(intfNum)].bCurrentBufferXY =
(HidReadCtrl[INTFNUM_OFFSET(intfNum)].bCurrentBufferXY +
1) & 0x01;
}
tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX = 0; //flush buffer X
tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY = 0; //flush buffer Y
HidReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp = 0; //indicates that no more data available in the EP
}
usbRestoreOutEndpointInterrupt(state);
return (kUSB_succeed);
}
uint8_t USBCDC_getInterfaceStatus (uint8_t intfNum, uint16_t* bytesSent, uint16_t* bytesReceived)
{
uint8_t ret = 0;
uint16_t stateIn, stateOut;
uint8_t edbIndex;
*bytesSent = 0;
*bytesReceived = 0;
edbIndex = stUsbHandle[intfNum].edb_Index;
stateIn = usbDisableInEndpointInterrupt(edbIndex);
stateOut = usbDisableOutEndpointInterrupt(edbIndex);
//Is send operation underway?
if (CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].nCdcBytesToSendLeft != 0){
ret |= USBCDC_WAITING_FOR_SEND;
*bytesSent = CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].nCdcBytesToSend -
CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].nCdcBytesToSendLeft;
}
//Is receive operation underway?
if (CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer != NULL){
ret |= USBCDC_WAITING_FOR_RECEIVE;
*bytesReceived = CdcReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceive -
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].
nBytesToReceiveLeft;
} else { //receive operation not started
//do not access USB memory if suspended (PLL off).
//It may produce BUS_ERROR
if (!bFunctionSuspended){
if ((tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX &
EPBCNT_NAK) | //any of buffers has a valid data packet
(tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY &
EPBCNT_NAK)){
ret |= USBCDC_DATA_WAITING;
}
}
}
if ((bFunctionSuspended) ||
(bEnumerationStatus != ENUMERATION_COMPLETE)){
//if suspended or not enumerated - report no other tasks pending
ret = USBCDC_BUS_NOT_AVAILABLE;
}
//restore interrupt status
usbRestoreInEndpointInterrupt(stateIn);
usbRestoreOutEndpointInterrupt(stateOut);
__no_operation();
return (ret);
}
uint8_t USBCDC_rejectData (uint8_t intfNum)
{
uint8_t edbIndex;
uint16_t state;
edbIndex = stUsbHandle[intfNum].edb_Index;
state = usbDisableOutEndpointInterrupt(edbIndex);
//atomic operation - disable interrupts
//do not access USB memory if suspended (PLL off). It may produce BUS_ERROR
if (bFunctionSuspended){
usbRestoreOutEndpointInterrupt(state);
return (USBCDC_BUS_NOT_AVAILABLE);
}
//Is receive operation underway?
//- do not flush buffers if any operation still active.
if (!CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer){
uint8_t tmp1 = tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX &
EPBCNT_NAK;
uint8_t tmp2 = tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY &
EPBCNT_NAK;
if (tmp1 ^ tmp2){ //switch current buffer if any and only ONE of buffers
//is full
//switch current buffer
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].bCurrentBufferXY =
(CdcReadCtrl[INTFNUM_OFFSET(intfNum)].bCurrentBufferXY +
1) & 0x01;
}
tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX = 0; //flush buffer X
tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY = 0; //flush buffer Y
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp = 0; //indicates that no more data available in the EP
}
usbRestoreOutEndpointInterrupt(state);
return (USB_SUCCEED);
}
/*
* Returns how many bytes are in the buffer are received and ready to be read.
*/
uint8_t USBPHDC_bytesInUSBBuffer (uint8_t intfNum)
{
uint8_t bTmp1 = 0;
uint16_t state;
uint8_t edbIndex;
edbIndex = stUsbHandle[intfNum].edb_Index;
state = usbDisableOutEndpointInterrupt(edbIndex);
//atomic operation - disable interrupts
if ((bFunctionSuspended) ||
(bEnumerationStatus != ENUMERATION_COMPLETE)){
usbRestoreOutEndpointInterrupt(state);
//if suspended or not enumerated - report 0 bytes available
return (0);
}
if (PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp > 0){ //If a RX operation is underway, part of data may was read of the
//OEP buffer
bTmp1 = PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp;
if (*PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2 & EPBCNT_NAK){ //the next buffer has a valid data packet
bTmp1 += *PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2 & 0x7F;
}
} else {
if (tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX & EPBCNT_NAK){ //this buffer has a valid data packet
bTmp1 = tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX & 0x7F;
}
if (tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY & EPBCNT_NAK){ //this buffer has a valid data packet
bTmp1 += tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY & 0x7F;
}
}
usbRestoreOutEndpointInterrupt(state);
return (bTmp1);
}
/*
* Receives data over interface intfNum, of size size, into memory starting at address data.
* Returns:
* kUSBPHDC_receiveStarted if the receiving process started.
* kUSBPHDC_receiveCompleted all requested date are received.
* kUSBPHDC_receiveInProgress previous receive opereation is in progress. The requested receive operation can be not started.
* kUSBPHDC_generalError error occurred.
*/
uint8_t USBPHDC_receiveData (uint8_t* data, uint16_t size, uint8_t intfNum)
{
uint8_t nTmp1;
uint8_t edbIndex;
uint16_t state;
edbIndex = stUsbHandle[intfNum].edb_Index;
if ((size == 0) || //read size is 0
(data == NULL)){
return (kUSBPHDC_generalError);
}
state = usbDisableOutEndpointInterrupt(edbIndex);
//atomic operation - disable interrupts
//do not access USB memory if suspended (PLL off). It may produce BUS_ERROR
if ((bFunctionSuspended) ||
(bEnumerationStatus != ENUMERATION_COMPLETE)){
//data can not be read because of USB suspended
usbRestoreOutEndpointInterrupt(state);
return (kUSBPHDC_busNotAvailable);
}
if (PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer != NULL){ //receive process already started
usbRestoreOutEndpointInterrupt(state);
return (kUSBPHDC_intfBusyError);
}
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceive = size; //bytes to receive
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceiveLeft = size; //left bytes to receive
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer = data; //set user receive buffer
//read rest of data from buffer, if any4
if (PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp > 0){
//copy data from pEP-endpoint into User's buffer
PHDCCopyUsbToBuff(PHDCReadCtrl[INTFNUM_OFFSET(
intfNum)].pCurrentEpPos,
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1, intfNum);
if (PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceiveLeft == 0){ //the Receive opereation is completed
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer = NULL; //no more receiving pending
if (wUsbEventMask & USB_RECEIVED_COMPLETED_EVENT){
USBPHDC_handleReceiveCompleted(intfNum); //call event handler in interrupt context
}
usbRestoreOutEndpointInterrupt(state);
return (kUSBPHDC_receiveCompleted); //receive completed
}
//check other EP buffer for data - exchange pCT1 with pCT2
if (PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1 ==
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX){
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1 =
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY;
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCurrentEpPos =
(uint8_t*)stUsbHandle[intfNum].oep_Y_Buffer;
} else {
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1 =
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX;
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCurrentEpPos =
(uint8_t*)stUsbHandle[intfNum].oep_X_Buffer;
}
nTmp1 = *PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1;
//try read data from second buffer
if (nTmp1 & EPBCNT_NAK){ //if the second buffer has received data?
nTmp1 = nTmp1 & 0x7f; //clear NAK bit
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp = nTmp1; //holds how many valid bytes in the EP buffer
PHDCCopyUsbToBuff(PHDCReadCtrl[INTFNUM_OFFSET(
intfNum)].pCurrentEpPos,
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1, intfNum);
}
if (PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceiveLeft == 0){ //the Receive opereation is completed
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer = NULL; //no more receiving pending
if (wUsbEventMask & USB_RECEIVED_COMPLETED_EVENT){
USBPHDC_handleReceiveCompleted(intfNum); //call event handler in interrupt context
}
usbRestoreOutEndpointInterrupt(state);
return (kUSBPHDC_receiveCompleted); //receive completed
}
} //read rest of data from buffer, if any
//read 'fresh' data, if available
nTmp1 = 0;
if (PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].bCurrentBufferXY == X_BUFFER){ //this is current buffer
if (tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX & EPBCNT_NAK){ //this buffer has a valid data packet
//this is the active EP buffer
//pEP1
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCurrentEpPos =
(uint8_t*)stUsbHandle[intfNum].oep_X_Buffer;
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1 =
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX;
//second EP buffer
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pEP2 =
(uint8_t*)stUsbHandle[intfNum].oep_Y_Buffer;
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2 =
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY;
nTmp1 = 1; //indicate that data is available
}
} else { //Y_BUFFER
if (tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY & EPBCNT_NAK){
//this is the active EP buffer
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCurrentEpPos =
(uint8_t*)stUsbHandle[intfNum].oep_Y_Buffer;
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1 =
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY;
//second EP buffer
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pEP2 =
(uint8_t*)stUsbHandle[intfNum].oep_X_Buffer;
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2 =
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX;
nTmp1 = 1; //indicate that data is available
}
}
if (nTmp1){
//how many byte we can get from one endpoint buffer
nTmp1 = *PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1;
while (nTmp1 == 0)
{
nTmp1 = *PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1;
}
if (nTmp1 & EPBCNT_NAK){
nTmp1 = nTmp1 & 0x7f; //clear NAK bit
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp = nTmp1; //holds how many valid bytes in the EP buffer
PHDCCopyUsbToBuff(PHDCReadCtrl[INTFNUM_OFFSET(
intfNum)].pCurrentEpPos,
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1, intfNum);
nTmp1 = *PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2;
//try read data from second buffer
if ((PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceiveLeft >
0) && //do we have more data to send?
(nTmp1 & EPBCNT_NAK)){ //if the second buffer has received data?
nTmp1 = nTmp1 & 0x7f; //clear NAK bit
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp = nTmp1; //holds how many valid bytes in the EP buffer
PHDCCopyUsbToBuff(PHDCReadCtrl[INTFNUM_OFFSET(
intfNum)].pEP2,
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2, intfNum);
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1 =
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2;
}
}
}
if (PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceiveLeft == 0){ //the Receive opereation is completed
PHDCReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer = NULL; //no more receiving pending
if (wUsbEventMask & USB_RECEIVED_COMPLETED_EVENT){
USBPHDC_handleReceiveCompleted(intfNum); //call event handler in interrupt context
}
usbRestoreOutEndpointInterrupt(state);
return (kUSBPHDC_receiveCompleted);
}
//interrupts enable
usbRestoreOutEndpointInterrupt(state);
return (kUSBPHDC_receiveStarted);
}
uint8_t USBMSC_pollCommand ()
{
uint16_t state;
uint8_t edbIndex;
uint8_t * pCT1;
uint8_t * pCT2;
edbIndex = stUsbHandle[MSC0_INTFNUM].edb_Index;
pCT1 = &tInputEndPointDescriptorBlock[edbIndex].bEPBCTX;
pCT2 = &tInputEndPointDescriptorBlock[edbIndex].bEPBCTY;
//check if currently transmitting data..
if (MscReadControl.bReadProcessing == TRUE){
state = usbDisableOutEndpointInterrupt(edbIndex);
//atomic operation - disable interrupts
if ((MscReadControl.dwBytesToSendLeft == 0) &&
(MscReadControl.lbaCount == 0)){
//data is no more processing - clear flags..
MscReadControl.bReadProcessing = FALSE;
usbRestoreOutEndpointInterrupt(state);
} else {
if (!(tInputEndPointDescriptorBlock[edbIndex].bEPCNF &
EPCNF_STALL)){ //if it is not stalled - contiune communication
USBIEPIFG |= 1 << (edbIndex + 1); //trigger IN interrupt to finish data tranmition
}
usbRestoreOutEndpointInterrupt(state);
return (USBMSC_PROCESS_BUFFER);
}
}
if (MscState.isMSCConfigured == FALSE){
return (USBMSC_OK_TO_SLEEP);
}
if (!MscState.bMscSendCsw){
if (MscState.bMscCbwReceived){
if (Scsi_Verify_CBW() == SUCCESS){
//Successful reception of CBW
//Parse the CBW opcode and invoke the right command handler function
Scsi_Cmd_Parser(MSC0_INTFNUM);
MscState.bMscSendCsw = TRUE;
}
MscState.bMscCbwReceived = FALSE; //CBW is performed!
} else {
return (USBMSC_OK_TO_SLEEP);
}
//check if any of out pipes has pending data and trigger interrupt
if ((MscWriteControl.pCT1 != NULL) &&
((*MscWriteControl.pCT1 & EPBCNT_NAK ) ||
(*MscWriteControl.pCT2 & EPBCNT_NAK ))){
USBOEPIFG |= 1 << (edbIndex + 1); //trigger OUT interrupt again
return (USBMSC_PROCESS_BUFFER); //do not asleep, as data is coming in
//and follow up data perform will be required.
}
}
if (MscState.bMscSendCsw){
if (MscState.bMcsCommandSupported == TRUE){
//watiting till transport is finished!
if ((MscWriteControl.bWriteProcessing == FALSE) &&
(MscReadControl.bReadProcessing == FALSE) &&
(MscReadControl.lbaCount == 0)){
//Send CSW
if (MscState.stallAtEndofTx == TRUE) {
if ((*pCT1 & EPBCNT_NAK) && (*pCT2 & EPBCNT_NAK)) {
MscState.stallAtEndofTx = FALSE;
usbStallInEndpoint(MSC0_INTFNUM);
}
}
else if (SUCCESS == Scsi_Send_CSW(MSC0_INTFNUM)){
MscState.bMscSendCsw = FALSE;
return (USBMSC_OK_TO_SLEEP);
}
}
else {
MSCFromHostToBuffer();
}
}
}
return (USBMSC_PROCESS_BUFFER); //When MscState.bMcsCommandSupported = FALSE, bReadProcessing became true, and
//bWriteProcessing = true.
}
/*
* Receives data over interface intfNum, of size size, into memory starting at address data.
* Returns:
* kUSBHID_receiveStarted if the receiving process started.
* kUSBHID_receiveCompleted all requested date are received.
* kUSBHID_receiveInProgress previous receive opereation is in progress. The requested receive operation can be not started.
* kUSBHID_generalError error occurred.
*/
BYTE USBHID_receiveData (BYTE* data, WORD size, BYTE intfNum)
{
BYTE nTmp1;
WORD state;
BYTE edbIndex;
edbIndex = stUsbHandle[intfNum].edb_Index;
if ((size == 0) || //read size is 0
(data == NULL)){
return (kUSBHID_generalError);
}
state = usbDisableOutEndpointInterrupt(edbIndex);
//atomic operation - disable interrupts
//do not access USB memory if suspended (PLL off). It may produce BUS_ERROR
if ((bFunctionSuspended) ||
(bEnumerationStatus != ENUMERATION_COMPLETE)){
usbRestoreOutEndpointInterrupt(state);
return (kUSBHID_busNotAvailable);
}
if (HidReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer != NULL){ //receive process already started
usbRestoreOutEndpointInterrupt(state);
return (kUSBHID_receiveInProgress);
}
HidReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceive = size; //bytes to receive
HidReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceiveLeft = size; //left bytes to receive
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer = data; //set user receive buffer
//read rest of data from buffer, if any
if (HidReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp > 0){
//copy data from pEP-endpoint into User's buffer
HidCopyUsbToBuff(HidReadCtrl[INTFNUM_OFFSET(
intfNum)].pCurrentEpPos,
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1,intfNum);
if (HidReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceiveLeft == 0){ //the Receive opereation is completed
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer = NULL; //no more receiving pending
USBHID_handleReceiveCompleted(intfNum); //call event handler in interrupt context
usbRestoreOutEndpointInterrupt(state);
return (kUSBHID_receiveCompleted); //receive completed
}
//check other EP buffer for data - exchange pCT1 with pCT2
if (HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1 ==
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX){
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1 =
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY;
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCurrentEpPos =
(BYTE*)stUsbHandle[intfNum].oep_Y_Buffer;
} else {
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1 =
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX;
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCurrentEpPos =
(BYTE*)stUsbHandle[intfNum].oep_X_Buffer;
}
nTmp1 = *HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1;
//try read data from second buffer
if (nTmp1 & EPBCNT_NAK){ //if the second buffer has received data?
nTmp1 = nTmp1 & 0x7f; //clear NAK bit
HidReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp =
*(HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCurrentEpPos + 1); //holds how many valid bytes in the EP buffer
if (HidReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp > nTmp1 - 2){
HidReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp = nTmp1 - 2;
}
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCurrentEpPos += 2; //here starts user data
HidCopyUsbToBuff(HidReadCtrl[INTFNUM_OFFSET(
intfNum)].pCurrentEpPos,
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1,intfNum);
}
if (HidReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceiveLeft == 0){ //the Receive opereation is completed
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer = NULL; //no more receiving pending
if (wUsbEventMask & kUSB_receiveCompletedEvent){
USBHID_handleReceiveCompleted(intfNum); //call event handler in interrupt context
}
usbRestoreOutEndpointInterrupt(state);
return (kUSBHID_receiveCompleted); //receive completed
}
} //read rest of data from buffer, if any
//read 'fresh' data, if available
nTmp1 = 0;
if (HidReadCtrl[INTFNUM_OFFSET(intfNum)].bCurrentBufferXY == X_BUFFER){ //this is current buffer
if (tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX & EPBCNT_NAK){ //this buffer has a valid data packet
//this is the active EP buffer
//pEP1
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCurrentEpPos =
(BYTE*)stUsbHandle[intfNum].oep_X_Buffer;
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1 =
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX;
//second EP buffer
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pEP2 =
(BYTE*)stUsbHandle[intfNum].oep_Y_Buffer;
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2 =
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY;
nTmp1 = 1; //indicate that data is available
}
} else { //Y_BUFFER
if (tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY & EPBCNT_NAK){
//this is the active EP buffer
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCurrentEpPos =
(BYTE*)stUsbHandle[intfNum].oep_Y_Buffer;
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1 =
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY;
//second EP buffer
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pEP2 =
(BYTE*)stUsbHandle[intfNum].oep_X_Buffer;
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2 =
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX;
nTmp1 = 1; //indicate that data is available
}
}
if (nTmp1){
//how many byte we can get from one endpoint buffer
nTmp1 = *HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1;
if (nTmp1 & EPBCNT_NAK){
nTmp1 = nTmp1 & 0x7f; //clear NAK bit
HidReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp =
*(HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCurrentEpPos + 1); //holds how many valid bytes in the EP buffer
if (HidReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp > nTmp1 - 2){
HidReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp = nTmp1 - 2;
}
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCurrentEpPos += 2; //here starts user data
HidCopyUsbToBuff(HidReadCtrl[INTFNUM_OFFSET(
intfNum)].pCurrentEpPos,
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1,intfNum);
nTmp1 = *HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2;
//try read data from second buffer
if ((HidReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceiveLeft >
0) && //do we have more data to receive?
(nTmp1 & EPBCNT_NAK)){ //if the second buffer has received data?
nTmp1 = nTmp1 & 0x7f; //clear NAK bit
HidReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp =
*(HidReadCtrl[INTFNUM_OFFSET(intfNum)].pEP2 + 1); //holds how many valid bytes in the EP buffer
if (HidReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp > nTmp1 -
2){
HidReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp = nTmp1 - 2;
}
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pEP2 += 2; //here starts user data
HidCopyUsbToBuff(HidReadCtrl[INTFNUM_OFFSET(
intfNum)].pEP2,
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2,intfNum);
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1 =
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2;
}
}
}
if (HidReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceiveLeft == 0){ //the Receive opereation is completed
HidReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer = NULL; //no more receiving pending
if (wUsbEventMask & kUSB_receiveCompletedEvent){
USBHID_handleReceiveCompleted(intfNum); //call event handler in interrupt context
}
usbRestoreOutEndpointInterrupt(state);
return (kUSBHID_receiveCompleted);
}
//interrupts enable
usbRestoreOutEndpointInterrupt(state);
return (kUSBHID_receiveStarted);
}