// *****************************************************************************
// @fn spi_string
// @brief Write a string through SPI
// @param unsigned char* TxData String to send
// @param unsigned char* RxData Reception buffer
// @param unsigned int length Length of the string
// @return none
// *****************************************************************************
void spi_string(unsigned char* TxData, unsigned char* RxData, unsigned int length)
{
#ifdef SPI_USE_DMA
spiDmaTransfer( (uint8_t*) TxData, (uint8_t*) RxData, length );
sleepUntilDmaDone();
#else
uint16_t i = 0;
if( RxData != NULL && TxData != NULL ) // two way transmition
{
while( i < length )
{
RxData[i] = spi_byte( TxData[i] );
i++;
}
}
else if( RxData == NULL && TxData != NULL ) // send only
{
while( i < length )
{
spi_byte( TxData[i] );
i++;
}
}
else if( RxData != NULL && TxData == NULL ) // recieve only
{
while( i < length )
{
RxData[i] = spi_byte( 0 );
i++;
}
}
#endif
}
// *****************************************************************************
// @fn spi_byte
// @brief Write a byte through SPI
// @param unsigned char data Byte to send
// @return unsigned char Recieved byte
// *****************************************************************************
unsigned char spi_byte(unsigned char data)
{
#ifdef SPI_USE_DMA
unsigned char receive = NULL;
spiDmaTransfer( (uint8_t*) &data, (uint8_t*) &receive, 1 );
sleepUntilDmaDone();
return receive;
#else
return USART_SpiTransfer( SPI_CHANNEL, data );
#endif
}
/*---------------------------------------------------------------------------*/
int spi2_writebuf(uint8_t *buf, int len)
{
#ifdef WITH_DMA
spiDmaTransfer(buf,NULL,len);
while(txActive)
{
clock_delay(1);
};
#else
int i=0;
for(i=0; i<len; i++)
{
spi2_readwrite(buf[i]);
}
#endif
return len;
}
/*---------------------------------------------------------------------------*/
int spi2_readbuf(uint8_t *buf, int readlen)
{
#ifdef WITH_DMA
//memset(dummy_byte, 0, sizeof(dummy_byte));
spiDmaTransfer(&dummy_byte,buf,readlen);
irq_disable();
while(rxActive)
{
EMU_EnterEM1();
irq_enable();
irq_disable();
}
irq_enable();
#else
int i = 0;
for(i=0;i<readlen;i++)
{
buf[i] = spi2_readwrite(0x00);
}
#endif
return readlen;
}
/**************************************************************************//**
* @brief Main function
* This example sets up the DMA to transfer outbound and incoming data from the
* SPI (USART1) to/from the source/destination buffers. Three tests are done:
* 1) Transmit data (string) without reading received data
* 2) Transmit data (string) and transfer received data to RAM buffer
* 3) Transmit dummy data and transfer received data to RAM buffer
*****************************************************************************/
int main(void)
{
/* Initialize chip */
CHIP_Init();
/* Configuring clocks in the Clock Management Unit (CMU) */
setupCmu();
/* Configura USART for SPI */
setupSpi();
/* Configure DMA transfer from RAM to SPI using ping-pong */
setupDma();
/* Send data to slave, no data reception */
spiDmaTransfer((uint8_t*) spiTxData, NULL, SPI_TRANSFER_SIZE);
/* Sleep until transfer is done */
sleepUntilTransferDone();
/* Send data to slave and save received data in buffer */
spiDmaTransfer((uint8_t*) spiTxData, (uint8_t*) spiRxData1, SPI_TRANSFER_SIZE);
/* Sleep until transfer is done */
sleepUntilTransferDone();
/* Send dummy data to slave and save received data in buffer */
spiDmaTransfer(NULL, (uint8_t*) spiRxData2, SPI_TRANSFER_SIZE);
/* Sleep until transfer is done */
sleepUntilTransferDone();
/* Send dummy data to slave and save received data in buffer */
spiDmaTransfer(NULL, (uint8_t*) spiRxData2, SPI_TRANSFER_SIZE);
/* Sleep until transfer is done */
sleepUntilTransferDone();
/* Send data to slave, no data reception */
spiDmaTransfer((uint8_t*) spiTxData, NULL, SPI_TRANSFER_SIZE);
/* Sleep until transfer is done */
sleepUntilTransferDone();
/* Send data to slave and save received data in buffer */
spiDmaTransfer((uint8_t*) spiTxData, (uint8_t*) spiRxData1, SPI_TRANSFER_SIZE);
/* Sleep until transfer is done */
sleepUntilTransferDone();
/* Send dummy data to slave and save received data in buffer */
spiDmaTransfer(NULL, (uint8_t*) spiRxData2, SPI_TRANSFER_SIZE);
/* Sleep until transfer is done */
sleepUntilTransferDone();
/* Cleaning up after DMA transfers */
DMA_Reset();
/* Done */
while (1);
}
