//------------------------------------------------------------------------------
/// The SPI_Handler must be called by the SPI Interrupt Service Routine with the
/// corresponding Spi instance.
/// The SPI_Handler will unlock the Spi semaphore and invoke the upper application
/// callback.
/// \param pSpid Pointer to a Spid instance.
//------------------------------------------------------------------------------
void SPID_Handler(Spid *pSpid)
{
SpidCmd *pSpidCmd = pSpid->pCurrentCommand;
AT91S_SPI *pSpiHw = pSpid->pSpiHw;
volatile unsigned int spiSr;
// Read the status register
spiSr = READ_SPI(pSpiHw, SPI_SR);
if (spiSr & AT91C_SPI_RXBUFF) {
// Disable transmitter and receiver
WRITE_SPI(pSpiHw, SPI_PTCR, AT91C_PDC_RXTDIS | AT91C_PDC_TXTDIS);
// Disable the SPI clock
WRITE_PMC(AT91C_BASE_PMC, PMC_PCDR, (1 << pSpid->spiId));
// Disable buffer complete interrupt
WRITE_SPI(pSpiHw, SPI_IDR, AT91C_SPI_RXBUFF);
// Release the dataflash semaphore
pSpid->semaphore++;
// Invoke the callback associated with the current command
if (pSpidCmd && pSpidCmd->callback)
pSpidCmd->callback(0, pSpidCmd->pArgument);
// Nothing must be done after. A new DF operation may have been started
// in the callback function.
}
}
/**
* \brief SPI xDMA Rx callback
* Invoked on SPi DMA reception done.
* \param channel DMA channel.
* \param pArg Pointer to callback argument - Pointer to Spid instance.
*/
static void SPID_Rx_Cb(uint32_t channel, Spid* pArg)
{
SpidCmd *pSpidCmd = pArg->pCurrentCommand;
Spi *pSpiHw = pArg->pSpiHw;
if (channel != spiDmaRxChannel)
return;
/* Disable the SPI TX & RX */
SPI_Disable ( pSpiHw );
/* Configure and enable interrupt on RC compare */
NVIC_ClearPendingIRQ(XDMAC_IRQn);
NVIC_DisableIRQ(XDMAC_IRQn);
/* Disable the SPI Peripheral */
PMC_DisablePeripheral ( pArg->spiId );
/* Release CS */
SPI_ReleaseCS(pSpiHw);
/* Release the DMA channels */
XDMAD_FreeChannel(pArg->pXdmad, spiDmaRxChannel);
XDMAD_FreeChannel(pArg->pXdmad, spiDmaTxChannel);
/* Release the dataflash semaphore */
pArg->semaphore++;
printf("\n\r%s\n\r",pArg->pCurrentCommand->pRxBuff);
/* Invoke the callback associated with the current command */
if (pSpidCmd && pSpidCmd->callback) {
//printf("p %d", pArg->semaphore);
pSpidCmd->callback(0, pSpidCmd->pArgument);
}
}
//------------------------------------------------------------------------------
/// SPI DMA transfer ISR, Handle RX complete
//------------------------------------------------------------------------------
void SPID_Handler(Spid *pSpid)
{
unsigned int dmaStatus;
SpidCmd *pSpidCmd = pSpid->pCurrentCommand;
AT91S_SPI *pSpiHw = pSpid->pSpiHw;
dmaStatus = DMA_GetStatus();
if ((dmaStatus & AT91C_CBTC) == 0)
return;
if ((dmaStatus & (DMA_CBTC << DMA_CHANNEL_0)) == 0)
return;
// Disable the SPI TX & RX
WRITE_SPI(pSpiHw, SPI_CR, AT91C_SPI_SPIDIS);
// Disable the SPI Peripheral
PERIPH_DISABLE(pSpid->spiId);
// Disable DMA
DMA_Disable();
// Disable DMA Peripheral
PERIPH_DISABLE(AT91C_ID_HDMA);
// Release the dataflash semaphore
pSpid->semaphore++;
// Invoke the callback associated with the current command
if (pSpidCmd && pSpidCmd->callback) {
pSpidCmd->callback(0, pSpidCmd->pArgument);
}
}