void spi_master_transfer(spi_t *obj, const void *tx, size_t tx_length, void *rx, size_t rx_length, uint8_t bit_width, uint32_t handler, uint32_t event, DMAUsage hint)
{
if(spi_active(obj)) {
return;
}
/* check corner case */
if(tx_length == 0) {
tx_length = rx_length;
tx = (void*) 0;
}
/* First, set the buffer */
spi_buffer_set(obj, tx, tx_length, rx, rx_length, bit_width);
/* If using DMA, allocate channels only if they have not already been allocated */
if (hint != DMA_USAGE_NEVER) {
/* User requested to transfer using DMA */
spi_enable_dma(obj, handler, hint);
/* Check if DMA setup was successful */
if (obj->spi.spiDmaMasterRx.dmaUsageState != DMA_USAGE_ALLOCATED && obj->spi.spiDmaMasterRx.dmaUsageState != DMA_USAGE_TEMPORARY_ALLOCATED) {
/* Set up an interrupt transfer as DMA is unavailable */
DSPI_MasterTransferCreateHandle(spi_address[obj->spi.instance], &obj->spi.spi_master_handle, (dspi_master_transfer_callback_t)handler, NULL);
}
} else {
/* User requested to transfer using interrupts */
/* Disable the DMA */
spi_enable_dma(obj, handler, hint);
/* Set up the interrupt transfer */
DSPI_MasterTransferCreateHandle(spi_address[obj->spi.instance], &obj->spi.spi_master_handle, (dspi_master_transfer_callback_t)handler, NULL);
}
/* Start the transfer */
if (spi_master_transfer_asynch(obj) != kStatus_Success) {
obj->spi.status = kDSPI_Idle;
}
}
status_t DSPI_RTOS_Init(dspi_rtos_handle_t *handle,
SPI_Type *base,
const dspi_master_config_t *masterConfig,
uint32_t srcClock_Hz)
{
OS_ERR err;
if (handle == NULL)
{
return kStatus_InvalidArgument;
}
if (base == NULL)
{
return kStatus_InvalidArgument;
}
memset(handle, 0, sizeof(dspi_rtos_handle_t));
OSSemCreate(&handle->mutex, "DSPI", (OS_SEM_CTR)1, &err);
if (OS_ERR_NONE != err)
{
return kStatus_Fail;
}
OSFlagCreate(&handle->event, "DSPI", (OS_FLAGS)0, &err);
if (OS_ERR_NONE != err)
{
OSSemDel(&handle->mutex, OS_OPT_DEL_ALWAYS, &err);
return kStatus_Fail;
}
handle->base = base;
DSPI_MasterInit(handle->base, masterConfig, srcClock_Hz);
DSPI_MasterTransferCreateHandle(handle->base, &handle->drv_handle, DSPI_RTOS_Callback, (void *)handle);
return kStatus_Success;
}
