//this function is used only by USB interrupt
BOOL CdcToHostFromBuffer (BYTE intfNum)
{
BYTE byte_count, nTmp2;
BYTE * pEP1;
BYTE * pEP2;
BYTE * pCT1;
BYTE * pCT2;
BYTE bWakeUp = FALSE; //TRUE for wake up after interrupt
BYTE edbIndex;
edbIndex = stUsbHandle[intfNum].edb_Index;
if (CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].nCdcBytesToSendLeft == 0){ //do we have somtething to send?
if (!CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].bZeroPacketSent){ //zero packet was not yet sent
CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].bZeroPacketSent = TRUE;
if (CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].last_ByteSend ==
EP_MAX_PACKET_SIZE_CDC){
if (CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].bCurrentBufferXY ==
X_BUFFER){
if (tInputEndPointDescriptorBlock[edbIndex].bEPBCTX &
EPBCNT_NAK){
tInputEndPointDescriptorBlock[edbIndex].bEPBCTX = 0;
CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].bCurrentBufferXY
= Y_BUFFER; //switch buffer
}
} else {
if (tInputEndPointDescriptorBlock[edbIndex].bEPBCTY &
EPBCNT_NAK){
tInputEndPointDescriptorBlock[edbIndex].bEPBCTY = 0;
CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].bCurrentBufferXY
= X_BUFFER; //switch buffer
}
}
}
CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].nCdcBytesToSend = 0; //nothing to send
//call event callback function
if (wUsbEventMask & kUSB_sendCompletedEvent){
bWakeUp = USBCDC_handleSendCompleted(intfNum);
}
} //if (!bSentZeroPacket)
return (bWakeUp);
}
CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].bZeroPacketSent = FALSE; //zero packet will be not sent: we have data
if (CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].bCurrentBufferXY == X_BUFFER){
//this is the active EP buffer
pEP1 = (BYTE*)stUsbHandle[intfNum].iep_X_Buffer;
pCT1 = &tInputEndPointDescriptorBlock[edbIndex].bEPBCTX;
//second EP buffer
pEP2 = (BYTE*)stUsbHandle[intfNum].iep_Y_Buffer;
pCT2 = &tInputEndPointDescriptorBlock[edbIndex].bEPBCTY;
} else {
//this is the active EP buffer
pEP1 = (BYTE*)stUsbHandle[intfNum].iep_Y_Buffer;
pCT1 = &tInputEndPointDescriptorBlock[edbIndex].bEPBCTY;
//second EP buffer
pEP2 = (BYTE*)stUsbHandle[intfNum].iep_X_Buffer;
pCT2 = &tInputEndPointDescriptorBlock[edbIndex].bEPBCTX;
}
//how many byte we can send over one endpoint buffer
byte_count =
(CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].nCdcBytesToSendLeft >
EP_MAX_PACKET_SIZE_CDC) ? EP_MAX_PACKET_SIZE_CDC : CdcWriteCtrl[
INTFNUM_OFFSET(intfNum)].nCdcBytesToSendLeft;
nTmp2 = *pCT1;
if (nTmp2 & EPBCNT_NAK){
USB_TX_memcpy(pEP1, CdcWriteCtrl[INTFNUM_OFFSET(
intfNum)].pUsbBufferToSend,
byte_count); //copy data into IEP3 X or Y buffer
*pCT1 = byte_count; //Set counter for usb In-Transaction
CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].bCurrentBufferXY =
(CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].bCurrentBufferXY + 1) & 0x01; //switch buffer
CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].nCdcBytesToSendLeft -= byte_count;
CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].pUsbBufferToSend += byte_count; //move buffer pointer
CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].last_ByteSend = byte_count;
//try to send data over second buffer
nTmp2 = *pCT2;
if ((CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].nCdcBytesToSendLeft > 0) && //do we have more data to send?
(nTmp2 & EPBCNT_NAK)){ //if the second buffer is free?
//how many byte we can send over one endpoint buffer
byte_count =
(CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].nCdcBytesToSendLeft >
EP_MAX_PACKET_SIZE_CDC) ? EP_MAX_PACKET_SIZE_CDC :
CdcWriteCtrl[
INTFNUM_OFFSET(intfNum)].nCdcBytesToSendLeft;
USB_TX_memcpy(pEP2, CdcWriteCtrl[INTFNUM_OFFSET(
intfNum)].pUsbBufferToSend,
byte_count); //copy data into IEP3 X or Y buffer
*pCT2 = byte_count; //Set counter for usb In-Transaction
CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].bCurrentBufferXY =
(CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].bCurrentBufferXY +
1) & 0x01; //switch buffer
CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].nCdcBytesToSendLeft -=
byte_count;
CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].pUsbBufferToSend +=
byte_count; //move buffer pointer
CdcWriteCtrl[INTFNUM_OFFSET(intfNum)].last_ByteSend = byte_count;
}
}
return (bWakeUp);
}
//this function is used only by USB interrupt
BOOL CdcToHostFromBuffer()
{
BYTE byte_count, nTmp2;
BYTE * pEP1;
BYTE * pEP2;
BYTE * pCT1;
BYTE * pCT2;
BYTE bWakeUp = FALSE; //TRUE for wake up after interrupt
static BYTE bZeroPacketSent; // = FALSE;
if (CdcWriteCtrl.nCdcBytesToSendLeft == 0) // do we have somtething to send?
{
if (!bZeroPacketSent) // zero packet was not yet sent
{
bZeroPacketSent = TRUE;
CdcWriteCtrl.nCdcBytesToSend = 0; // nothing to send
//call event callback function
if (wUsbEventMask & kUSB_sendCompletedEvent)
{
bWakeUp = USBCDC_handleSendCompleted(1);
}
} // if (!bSentZeroPacket)
return bWakeUp;
}
bZeroPacketSent = FALSE; // zero packet will be not sent: we have data
if (CdcWriteCtrl.bCurrentBufferXY == X_BUFFER)
{
//this is the active EP buffer
pEP1 = (BYTE*)IEP3_X_BUFFER_ADDRESS;
pCT1 = &tInputEndPointDescriptorBlock[EDB(CDC_INEP_ADDR)].bEPBCTX;
//second EP buffer
pEP2 = (BYTE*)IEP3_Y_BUFFER_ADDRESS;
pCT2 = &tInputEndPointDescriptorBlock[EDB(CDC_INEP_ADDR)].bEPBCTY;
}
else
{
//this is the active EP buffer
pEP1 = (BYTE*)IEP3_Y_BUFFER_ADDRESS;
pCT1 = &tInputEndPointDescriptorBlock[EDB(CDC_INEP_ADDR)].bEPBCTY;
//second EP buffer
pEP2 = (BYTE*)IEP3_X_BUFFER_ADDRESS;
pCT2 = &tInputEndPointDescriptorBlock[EDB(CDC_INEP_ADDR)].bEPBCTX;
}
// how many byte we can send over one endpoint buffer
byte_count = (CdcWriteCtrl.nCdcBytesToSendLeft > EP_MAX_PACKET_SIZE_CDC) ? EP_MAX_PACKET_SIZE_CDC : CdcWriteCtrl.nCdcBytesToSendLeft;
nTmp2 = *pCT1;
if(nTmp2 & EPBCNT_NAK)
{
USB_TX_memcpy(pEP1, CdcWriteCtrl.pBufferToSend, byte_count); // copy data into IEP3 X or Y buffer
*pCT1 = byte_count; // Set counter for usb In-Transaction
CdcWriteCtrl.bCurrentBufferXY = (CdcWriteCtrl.bCurrentBufferXY+1)&0x01; //switch buffer
CdcWriteCtrl.nCdcBytesToSendLeft -= byte_count;
CdcWriteCtrl.pBufferToSend += byte_count; // move buffer pointer
//try to send data over second buffer
nTmp2 = *pCT2;
if ((CdcWriteCtrl.nCdcBytesToSendLeft > 0) && // do we have more data to send?
(nTmp2 & EPBCNT_NAK)) // if the second buffer is free?
{
// how many byte we can send over one endpoint buffer
byte_count = (CdcWriteCtrl.nCdcBytesToSendLeft > EP_MAX_PACKET_SIZE_CDC) ? EP_MAX_PACKET_SIZE_CDC : CdcWriteCtrl.nCdcBytesToSendLeft;
USB_TX_memcpy(pEP2, CdcWriteCtrl.pBufferToSend, byte_count); // copy data into IEP3 X or Y buffer
*pCT2 = byte_count; // Set counter for usb In-Transaction
CdcWriteCtrl.bCurrentBufferXY = (CdcWriteCtrl.bCurrentBufferXY+1)&0x01; //switch buffer
CdcWriteCtrl.nCdcBytesToSendLeft -= byte_count;
CdcWriteCtrl.pBufferToSend += byte_count; //move buffer pointer
}
}
return bWakeUp;
}
