int32_t DRV_SPI_MasterRMReceive8BitISR( struct DRV_SPI_DRIVER_OBJECT * pDrvInstance )
{
register SPI_MODULE_ID spiId = pDrvInstance->spiId;
register DRV_SPI_JOB_OBJECT * currentJob = pDrvInstance->currentJob;
if (currentJob == NULL)
{
return 0;
}
if (PLIB_SPI_ReceiverBufferIsFull(spiId))
{
/* We have data waiting in the SPI buffer */
if (currentJob->dataLeftToRx != 0)
{
/* Receive the data and updates the count */
currentJob->rxBuffer[currentJob->dataRxed] = PLIB_SPI_BufferRead(spiId);
currentJob->dataRxed++;
currentJob->dataLeftToRx --;
}
else
{
/* No Data but dummy data: Note: We cannot just clear the
buffer because we have to keep track of how many symbols/units we
have received, and the number may have increased since we checked
how full the buffer is.*/
PLIB_SPI_BufferRead(spiId);
//SYS_CONSOLE_MESSAGE("Rd ");
currentJob->dummyLeftToRx--;
}
/* No longer have a symbol in progress */
pDrvInstance->symbolsInProgress = 0;
}
return 0;
}
int32_t DRV_SPI1_BufferAddWriteRead(const void * txBuffer, void * rxBuffer, uint32_t size)
{
bool continueLoop;
int32_t txcounter = 0;
int32_t rxcounter = 0;
do {
continueLoop = false;
if(!PLIB_SPI_TransmitBufferIsFull(SPI_ID_2) && txcounter < size)
{
PLIB_SPI_BufferWrite(SPI_ID_2, ((uint8_t*)txBuffer)[txcounter]);
txcounter++;
continueLoop = true;
}
while (txcounter != rxcounter)
{
while(!PLIB_SPI_ReceiverBufferIsFull(SPI_ID_2));
((uint8_t*)rxBuffer)[rxcounter] = PLIB_SPI_BufferRead(SPI_ID_2);
rxcounter++;
continueLoop = true;
}
if (txcounter > rxcounter)
{
continueLoop = true;
}
}while(continueLoop);
return txcounter;
}
void SPIPut(uint16_t channel, unsigned char data)
{
// Wait for free buffer
while(!PLIB_SPI_TransmitBufferIsEmpty(channel));
PLIB_SPI_BufferWrite(channel, data);
// Wait for data byte
while(!PLIB_SPI_ReceiverBufferIsFull(channel));
return;
}
bool DRV_SPI0_ReceiverBufferIsFull(void)
{
return (PLIB_SPI_ReceiverBufferIsFull(SPI_ID_4));
}