/*
** This function will Assert the Chip select line before transmission, will
** enable the Edma events for Tx/Rx of McSPI peripheral, will De-assert the
** Chip select once communication is complete.
*/
static void McSPITransfer(unsigned short length)
{
/* Set the word count field with the data length to be transferred.*/
McSPIWordCountSet(SOC_SPI_0_REGS, length);
/* Force the SPIEN to low state.*/
McSPICSAssert(SOC_SPI_0_REGS, MCSPI_CH_NUM);
/* Enable the Tx/Rx DMA events for McSPI. */
McSPIDMAEnable(SOC_SPI_0_REGS, (MCSPI_DMA_RX_EVENT | MCSPI_DMA_TX_EVENT),
MCSPI_CH_NUM);
/* Enable the McSPI channel for communication.*/
McSPIChannelEnable(SOC_SPI_0_REGS, MCSPI_CH_NUM);
/* Wait for control to return from ISR.*/
while((0 == flagTx) || (flagRx == 0));
flagTx = 0;
flagRx = 0;
/* Force the SPIEN to high state.*/
McSPICSDeAssert(SOC_SPI_0_REGS, MCSPI_CH_NUM);
/* Disable the McSPI channel for communication.*/
McSPIChannelDisable(SOC_SPI_0_REGS, MCSPI_CH_NUM);
}
/*
** This function will activate/deactivate CS line and also enable Tx and Rx
** interrupts of McSPI peripheral.
*/
static void McSPITransfer(void)
{
p_tx = txBuffer;
p_rx = rxBuffer;
/* SPIEN line is forced to low state.*/
McSPICSAssert(SOC_SPI_0_REGS, chNum);
/* Enable the Tx/Rx interrupts of McSPI.*/
McSPIIntEnable(SOC_SPI_0_REGS, MCSPI_INT_TX_EMPTY(chNum) |
MCSPI_INT_RX_FULL(chNum));
/* Enable the McSPI channel for communication.*/
McSPIChannelEnable(SOC_SPI_0_REGS, chNum);
/* Wait until control returns back from McSPI ISR.*/
while(flag);
flag = 1;
/* Force SPIEN line to the inactive state.*/
McSPICSDeAssert(SOC_SPI_0_REGS, chNum);
/* Disable the McSPI channel.*/
McSPIChannelDisable(SOC_SPI_0_REGS, chNum);
}
/*
** This function will activate/deactivate CS line and also enable Tx and Rx
** interrupts of McSPI peripheral.
*/
void _mcspi_transfer(Mcspi_t *McspiStruct)
{
McspiStruct->BuffTmp = McspiStruct->Buff;
/* SPIEN line is forced to low state.*/
McSPICSAssert(McspiStruct->BaseAddr, McspiStruct->Channel);
/* Enable the Tx/Rx interrupts of McSPI.*/
McSPIIntEnable(McspiStruct->BaseAddr, MCSPI_INT_TX_EMPTY(McspiStruct->Channel) |
MCSPI_INT_RX_FULL(McspiStruct->Channel));
/* Enable the McSPI channel for communication.*/
McSPIChannelEnable(McspiStruct->BaseAddr, McspiStruct->Channel);
/* Wait until control returns back from McSPI ISR.*/
while(McspiStruct->flag);
McspiStruct->flag = 1;
/* Force SPIEN line to the inactive state.*/
McSPICSDeAssert(McspiStruct->BaseAddr, McspiStruct->Channel);
/* Disable the McSPI channel.*/
McSPIChannelDisable(McspiStruct->BaseAddr, McspiStruct->Channel);
}