//this function is used only by USB interrupt.
//It fills user receiving buffer with received data
BOOL CdcToBufferFromHost (BYTE intfNum)
{
BYTE * pEP1;
BYTE nTmp1;
BYTE bWakeUp = FALSE; //per default we do not wake up after interrupt
BYTE edbIndex;
edbIndex = stUsbHandle[intfNum].edb_Index;
if (CdcReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceiveLeft == 0){ //do we have somtething to receive?
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer = NULL; //no more receiving pending
return (bWakeUp);
}
//No data to receive...
if (!((tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX |
tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY)
& 0x80)){
return (bWakeUp);
}
if (CdcReadCtrl[INTFNUM_OFFSET(intfNum)].bCurrentBufferXY == X_BUFFER){ //X is current buffer
//this is the active EP buffer
pEP1 = (BYTE*)stUsbHandle[intfNum].oep_X_Buffer;
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1 =
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX;
//second EP buffer
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pEP2 =
(BYTE*)stUsbHandle[intfNum].oep_Y_Buffer;
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2 =
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY;
} else {
//this is the active EP buffer
pEP1 = (BYTE*)stUsbHandle[intfNum].oep_Y_Buffer;
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1 =
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY;
//second EP buffer
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pEP2 =
(BYTE*)stUsbHandle[intfNum].oep_X_Buffer;
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2 =
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX;
}
//how many byte we can get from one endpoint buffer
nTmp1 = *CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1;
if (nTmp1 & EPBCNT_NAK){
nTmp1 = nTmp1 & 0x7f; //clear NAK bit
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp = nTmp1; //holds how many valid bytes in the EP buffer
CopyUsbToBuff(pEP1, CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1, intfNum);
nTmp1 = *CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2;
//try read data from second buffer
if ((CdcReadCtrl[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
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp = nTmp1; //holds how many valid bytes in the EP buffer
CopyUsbToBuff(CdcReadCtrl[INTFNUM_OFFSET(
intfNum)].pEP2,
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2, intfNum);
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1 =
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2;
}
}
if (CdcReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceiveLeft == 0){ //the Receive opereation is completed
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer = NULL; //no more receiving pending
if (wUsbEventMask & kUSB_receiveCompletedEvent){
bWakeUp |= USBCDC_handleReceiveCompleted(intfNum);
}
if (CdcReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp){ //Is not read data still available in the EP?
if (wUsbEventMask & kUSB_dataReceivedEvent){
bWakeUp |= USBCDC_handleDataReceived(intfNum);
}
}
}
return (bWakeUp);
}
//this function is used only by USB interrupt.
//It fills user receiving buffer with received data
BOOL CdcToBufferFromHost()
{
BYTE * pEP1;
BYTE nTmp1;
BYTE bWakeUp = FALSE; // per default we do not wake up after interrupt
if (CdcReadCtrl.nBytesToReceiveLeft == 0) // do we have somtething to receive?
{
CdcReadCtrl.pUserBuffer = NULL; // no more receiving pending
return bWakeUp;
}
// No data to receive...
if (!((tOutputEndPointDescriptorBlock[EDB(CDC_OUTEP_ADDR)].bEPBCTX |
tOutputEndPointDescriptorBlock[EDB(CDC_OUTEP_ADDR)].bEPBCTY)
& 0x80))
{
return bWakeUp;
}
if (CdcReadCtrl.bCurrentBufferXY == X_BUFFER) //X is current buffer
{
//this is the active EP buffer
pEP1 = (BYTE*)OEP3_X_BUFFER_ADDRESS;
CdcReadCtrl.pCT1 = &tOutputEndPointDescriptorBlock[EDB(CDC_OUTEP_ADDR)].bEPBCTX;
//second EP buffer
CdcReadCtrl.pEP2 = (BYTE*)OEP3_Y_BUFFER_ADDRESS;
CdcReadCtrl.pCT2 = &tOutputEndPointDescriptorBlock[EDB(CDC_OUTEP_ADDR)].bEPBCTY;
}
else
{
//this is the active EP buffer
pEP1 = (BYTE*)OEP3_Y_BUFFER_ADDRESS;
CdcReadCtrl.pCT1 = &tOutputEndPointDescriptorBlock[EDB(CDC_OUTEP_ADDR)].bEPBCTY;
//second EP buffer
CdcReadCtrl.pEP2 = (BYTE*)OEP3_X_BUFFER_ADDRESS;
CdcReadCtrl.pCT2 = &tOutputEndPointDescriptorBlock[EDB(CDC_OUTEP_ADDR)].bEPBCTX;
}
// how many byte we can get from one endpoint buffer
nTmp1 = *CdcReadCtrl.pCT1;
while(nTmp1 == 0)
{
nTmp1 = *CdcReadCtrl.pCT1;
}
if(nTmp1 & EPBCNT_NAK)
{
nTmp1 = nTmp1 &0x7f; // clear NAK bit
CdcReadCtrl.nBytesInEp = nTmp1; // holds how many valids bytes in the EP buffer
CopyUsbToBuff(pEP1, CdcReadCtrl.pCT1);
nTmp1 = *CdcReadCtrl.pCT2;
//try read data from second buffer
if ((CdcReadCtrl.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
CdcReadCtrl.nBytesInEp = nTmp1; // holds how many valids bytes in the EP buffer
CopyUsbToBuff(CdcReadCtrl.pEP2, CdcReadCtrl.pCT2);
CdcReadCtrl.pCT1 = CdcReadCtrl.pCT2;
}
}
if (CdcReadCtrl.nBytesToReceiveLeft == 0) // the Receive opereation is completed
{
CdcReadCtrl.pUserBuffer = NULL; // no more receiving pending
if (wUsbEventMask & kUSB_receiveCompletedEvent)
{
bWakeUp = USBCDC_handleReceiveCompleted(1);
}
if (CdcReadCtrl.nBytesInEp) // Is not read data still available in the EP?
{
if (wUsbEventMask & kUSB_dataReceivedEvent)
{
bWakeUp = USBCDC_handleDataReceived(1);
}
}
}
return bWakeUp;
}
/*
* Receives data over interface intfNum, of size size, into memory starting at address data.
* Returns:
* kUSBCDC_receiveStarted if the receiving process started.
* kUSBCDC_receiveCompleted all requested date are received.
* kUSBCDC_receiveInProgress previous receive opereation is in progress. The requested receive operation can be not started.
* kUSBCDC_generalError error occurred.
*/
BYTE USBCDC_receiveData (BYTE* data, WORD size, BYTE intfNum)
{
BYTE nTmp1;
BYTE edbIndex;
WORD state;
edbIndex = stUsbHandle[intfNum].edb_Index;
if ((size == 0) || //read size is 0
(data == NULL)){
return (kUSBCDC_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 (kUSBCDC_busNotAvailable);
}
if (CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer != NULL){ //receive process already started
usbRestoreOutEndpointInterrupt(state);
return (kUSBCDC_intfBusyError);
}
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceive = size; //bytes to receive
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceiveLeft = size; //left bytes to receive
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer = data; //set user receive buffer
//read rest of data from buffer, if any
if (CdcReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp > 0){
//copy data from pEP-endpoint into User's buffer
CopyUsbToBuff(CdcReadCtrl[INTFNUM_OFFSET(
intfNum)].pCurrentEpPos,
CdcReadCtrl[INTFNUM_OFFSET(
intfNum)
].pCT1, intfNum);
if (CdcReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceiveLeft == 0){ //the Receive opereation is completed
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer = NULL; //no more receiving pending
if (wUsbEventMask & kUSB_receiveCompletedEvent){
USBCDC_handleReceiveCompleted(intfNum); //call event handler in interrupt context
}
usbRestoreOutEndpointInterrupt(state);
return (kUSBCDC_receiveCompleted); //receive completed
}
//check other EP buffer for data - exchange pCT1 with pCT2
if (CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1 ==
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX){
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1 =
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY;
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCurrentEpPos =
(BYTE*)stUsbHandle[intfNum].oep_Y_Buffer;
} else {
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1 =
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX;
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCurrentEpPos =
(BYTE*)stUsbHandle[intfNum].oep_X_Buffer;
}
nTmp1 = *CdcReadCtrl[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
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp = nTmp1; //holds how many valid bytes in the EP buffer
CopyUsbToBuff(CdcReadCtrl[INTFNUM_OFFSET(
intfNum)].pCurrentEpPos,
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1, intfNum);
}
if (CdcReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceiveLeft == 0){ //the Receive opereation is completed
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer = NULL; //no more receiving pending
if (wUsbEventMask & kUSB_receiveCompletedEvent){
USBCDC_handleReceiveCompleted(intfNum); //call event handler in interrupt context
}
usbRestoreOutEndpointInterrupt(state);
return (kUSBCDC_receiveCompleted); //receive completed
}
} //read rest of data from buffer, if any
//read 'fresh' data, if available
nTmp1 = 0;
if (CdcReadCtrl[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
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCurrentEpPos =
(BYTE*)stUsbHandle[intfNum].oep_X_Buffer;
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1 =
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTX;
//second EP buffer
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pEP2 =
(BYTE*)stUsbHandle[intfNum].oep_Y_Buffer;
CdcReadCtrl[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
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCurrentEpPos =
(BYTE*)stUsbHandle[intfNum].oep_Y_Buffer;
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1 =
&tOutputEndPointDescriptorBlock[edbIndex].bEPBCTY;
//second EP buffer
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pEP2 =
(BYTE*)stUsbHandle[intfNum].oep_X_Buffer;
CdcReadCtrl[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 = *CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1;
while (nTmp1 == 0)
{
nTmp1 = *CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1;
}
if (nTmp1 & EPBCNT_NAK){
nTmp1 = nTmp1 & 0x7f; //clear NAK bit
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp = nTmp1; //holds how many valid bytes in the EP buffer
CopyUsbToBuff(CdcReadCtrl[INTFNUM_OFFSET(
intfNum)].pCurrentEpPos,
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1, intfNum);
nTmp1 = *CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2;
//try read data from second buffer
if ((CdcReadCtrl[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
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesInEp = nTmp1; //holds how many valid bytes in the EP buffer
CopyUsbToBuff(CdcReadCtrl[INTFNUM_OFFSET(
intfNum)].pEP2,
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2, intfNum);
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT1 =
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pCT2;
}
}
}
if (CdcReadCtrl[INTFNUM_OFFSET(intfNum)].nBytesToReceiveLeft == 0){ //the Receive opereation is completed
CdcReadCtrl[INTFNUM_OFFSET(intfNum)].pUserBuffer = NULL; //no more receiving pending
if (wUsbEventMask & kUSB_receiveCompletedEvent){
USBCDC_handleReceiveCompleted(intfNum); //call event handler in interrupt context
}
usbRestoreOutEndpointInterrupt(state);
return (kUSBCDC_receiveCompleted);
}
//interrupts enable
usbRestoreOutEndpointInterrupt(state);
return (kUSBCDC_receiveStarted);
}
/*
Receives data over interface intfNum, of size size, into memory starting at address data.
Returns:
kUSBCDC_receiveStarted if the receiving process started.
kUSBCDC_receiveCompleted all requested date are received.
kUSBCDC_receiveInProgress previous receive opereation is in progress. The requested receive operation can be not started.
kUSBCDC_generalError error occurred.
*/
BYTE USBCDC_receiveData(BYTE* data, WORD size, BYTE intfNum)
{
BYTE nTmp1;
if (CdcReadCtrl.pUserBuffer != NULL) // receive process already started
{
return kUSBCDC_intfBusyError;
}
if ((size == 0) || // read size is 0
(data == NULL))
{
return kUSBCDC_generalError;
}
// 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
return kUSBCDC_busNotAvailable;
}
__disable_interrupt(); //interrupts disable
CdcReadCtrl.nBytesToReceive = size; // bytes to receive
CdcReadCtrl.nBytesToReceiveLeft = size; // left bytes to receive
CdcReadCtrl.pUserBuffer = data; // set user receive buffer
//read rest of data from buffer, if any
if (CdcReadCtrl.nBytesInEp > 0)
{
// copy data from pEP-endpoint into User's buffer
CopyUsbToBuff(CdcReadCtrl.pCurrentEpPos, CdcReadCtrl.pCT1);
if (CdcReadCtrl.nBytesToReceiveLeft == 0) // the Receive opereation is completed
{
CdcReadCtrl.pUserBuffer = NULL; // no more receiving pending
USBCDC_handleReceiveCompleted(1); // call event handler in interrupt context
__enable_interrupt(); // interrupts enable
return kUSBCDC_receiveCompleted; // receive completed
}
// check other EP buffer for data - exchange pCT1 with pCT2
if (CdcReadCtrl.pCT1 == &tOutputEndPointDescriptorBlock[EDB(CDC_OUTEP_ADDR)].bEPBCTX)
{
CdcReadCtrl.pCT1 = &tOutputEndPointDescriptorBlock[EDB(CDC_OUTEP_ADDR)].bEPBCTY;
CdcReadCtrl.pCurrentEpPos = (BYTE*)OEP3_Y_BUFFER_ADDRESS;
}
else
{
CdcReadCtrl.pCT1 = &tOutputEndPointDescriptorBlock[EDB(CDC_OUTEP_ADDR)].bEPBCTX;
CdcReadCtrl.pCurrentEpPos = (BYTE*)OEP3_X_BUFFER_ADDRESS;
}
nTmp1 = *CdcReadCtrl.pCT1;
//try read data from second buffer
if (nTmp1 & EPBCNT_NAK) // if the second buffer has received data?
{
nTmp1 = nTmp1 &0x7f; // clear NAK bit
CdcReadCtrl.nBytesInEp = nTmp1; // holds how many valids bytes in the EP buffer
CopyUsbToBuff(CdcReadCtrl.pCurrentEpPos, CdcReadCtrl.pCT1);
}
if (CdcReadCtrl.nBytesToReceiveLeft == 0) // the Receive opereation is completed
{
CdcReadCtrl.pUserBuffer = NULL; // no more receiving pending
__enable_interrupt(); // interrupts enable
return kUSBCDC_receiveCompleted; // receive completed
}
} //read rest of data from buffer, if any
//read 'fresh' data, if available
nTmp1 = 0;
if (CdcReadCtrl.bCurrentBufferXY == X_BUFFER) //this is current buffer
{
if (tOutputEndPointDescriptorBlock[EDB(CDC_OUTEP_ADDR)].bEPBCTX & EPBCNT_NAK) //this buffer has a valid data packet
{
//this is the active EP buffer
//pEP1
CdcReadCtrl.pCurrentEpPos = (BYTE*)OEP3_X_BUFFER_ADDRESS;
CdcReadCtrl.pCT1 = &tOutputEndPointDescriptorBlock[EDB(CDC_OUTEP_ADDR)].bEPBCTX;
//second EP buffer
CdcReadCtrl.pEP2 = (BYTE*)OEP3_Y_BUFFER_ADDRESS;
CdcReadCtrl.pCT2 = &tOutputEndPointDescriptorBlock[EDB(CDC_OUTEP_ADDR)].bEPBCTY;
nTmp1 = 1; //indicate that data is available
}
}
else // Y_BUFFER
if (tOutputEndPointDescriptorBlock[EDB(CDC_OUTEP_ADDR)].bEPBCTY & EPBCNT_NAK)
{
//this is the active EP buffer
CdcReadCtrl.pCurrentEpPos = (BYTE*)OEP3_Y_BUFFER_ADDRESS;
CdcReadCtrl.pCT1 = &tOutputEndPointDescriptorBlock[EDB(CDC_OUTEP_ADDR)].bEPBCTY;
//second EP buffer
CdcReadCtrl.pEP2 = (BYTE*)OEP3_X_BUFFER_ADDRESS;
CdcReadCtrl.pCT2 = &tOutputEndPointDescriptorBlock[EDB(CDC_OUTEP_ADDR)].bEPBCTX;
nTmp1 = 1; //indicate that data is available
}
if (nTmp1)
{
// how many byte we can get from one endpoint buffer
nTmp1 = *CdcReadCtrl.pCT1;
while(nTmp1 == 0)
{
nTmp1 = *CdcReadCtrl.pCT1;
}
if(nTmp1 & EPBCNT_NAK)
{
nTmp1 = nTmp1 &0x7f; // clear NAK bit
CdcReadCtrl.nBytesInEp = nTmp1; // holds how many valids bytes in the EP buffer
CopyUsbToBuff(CdcReadCtrl.pCurrentEpPos, CdcReadCtrl.pCT1);
nTmp1 = *CdcReadCtrl.pCT2;
//try read data from second buffer
if ((CdcReadCtrl.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
CdcReadCtrl.nBytesInEp = nTmp1; // holds how many valids bytes in the EP buffer
CopyUsbToBuff(CdcReadCtrl.pEP2, CdcReadCtrl.pCT2);
CdcReadCtrl.pCT1 = CdcReadCtrl.pCT2;
}
}
}
if (CdcReadCtrl.nBytesToReceiveLeft == 0) // the Receive opereation is completed
{
CdcReadCtrl.pUserBuffer = NULL; // no more receiving pending
USBCDC_handleReceiveCompleted(1); // call event handler in interrupt context
__enable_interrupt(); // interrupts enable
return kUSBCDC_receiveCompleted;
}
//interrupts enable
__enable_interrupt();
return kUSBCDC_receiveStarted;
}