// *****************************************************************************
// @fn spi_init
// @brief Initialize SPI
// @param none
// @return none
// *****************************************************************************
void spi_init(void)
{
setupCmu();
setupSpi();
#ifdef SPI_USE_DMA
setupDma();
#endif
DPRINT("SPI Init.");
}
/**************************************************************************//**
* @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);
}
