void SpiFormat(Spi_t *obj, int8_t bits, int8_t cpol, int8_t cpha, int8_t slave)
{
spi_clock_polarity_t clockPolarity;
spi_clock_phase_t clockPhase;
spi_data_bitcount_mode_t bitCount;
/* Disable Spi module */
SPI_HAL_Disable(obj->Spi);
clockPolarity = ((cpol != 1) ? kSpiClockPolarity_ActiveHigh : kSpiClockPolarity_ActiveLow);
clockPhase = ((cpha != 1) ? kSpiClockPhase_FirstEdge : kSpiClockPhase_SecondEdge);
bitCount = ((bits != 8) ? kSpi16BitMode : kSpi8BitMode);
if (obj->isSlave) {
/* Set SPI to master mode */
SPI_HAL_SetMasterSlave(obj->Spi, kSpiSlave);
} else {
/* Set SPI to master mode */
SPI_HAL_SetMasterSlave(obj->Spi, kSpiMaster);
// Set slave select to automatic output mode
SPI_HAL_SetSlaveSelectOutputMode(obj->Spi, kSpiSlaveSelect_AutomaticOutput);
}
SPI_HAL_SetDataFormat(obj->Spi, clockPolarity, clockPhase, kSpiMsbFirst);
SPI_HAL_Set8or16BitMode(obj->Spi, bitCount);
/* Enable Spi module */
SPI_HAL_Enable(obj->Spi);
}
/*FUNCTION**********************************************************************
*
* Function Name : SPI_DRV_MasterInit
* Description : Initialize a SPI instance for master mode operation.
* This function uses a CPU interrupt driven method for transferring data.
* This function initializes the run-time state structure to track the ongoing
* transfers, ungates the clock to the SPI module, resets and initializes the module
* to default settings, configures the IRQ state structure, enables
* the module-level interrupt to the core, and enables the SPI module.
*
*END**************************************************************************/
spi_status_t SPI_DRV_MasterInit(uint32_t instance, spi_master_state_t * spiState)
{
SPI_Type *base = g_spiBase[instance];
/* Clear the state for this instance.*/
memset(spiState, 0, sizeof(* spiState));
/* Enable clock for SPI*/
CLOCK_SYS_EnableSpiClock(instance);
/* configure the run-time state struct with the source clock value */
spiState->spiSourceClock = CLOCK_SYS_GetSpiFreq(instance);
/* Reset the SPI module to it's default state, which includes SPI disabled */
SPI_HAL_Init(base);
/* Init the interrupt sync object.*/
OSA_SemaCreate(&spiState->irqSync, 0);
/* Set SPI to master mode */
SPI_HAL_SetMasterSlave(base, kSpiMaster);
/* Set slave select to automatic output mode */
SPI_HAL_SetSlaveSelectOutputMode(base, kSpiSlaveSelect_AutomaticOutput);
/* Set the SPI pin mode to normal mode */
SPI_HAL_SetPinMode(base, kSpiPinMode_Normal);
#if FSL_FEATURE_SPI_FIFO_SIZE
if (g_spiFifoSize[instance] != 0)
{
/* If SPI module contains a FIFO, enable it and set watermarks to half full/empty */
SPI_HAL_SetFifoMode(base, true, kSpiTxFifoOneHalfEmpty, kSpiRxFifoOneHalfFull);
}
#endif
/* Save runtime structure pointers to irq handler can point to the correct state structure*/
g_spiStatePtr[instance] = spiState;
/* Enable SPI interrupt.*/
INT_SYS_EnableIRQ(g_spiIrqId[instance]);
/* SPI system Enable*/
SPI_HAL_Enable(base);
return kStatus_SPI_Success;
}
/*FUNCTION**********************************************************************
*
* Function Name : SPI_DRV_DmaMasterInit
* Description : Initializes a SPI instance for master mode operation to work with DMA.
* This function uses a dma driven method for transferring data.
* this function initializes the run-time state structure to track the ongoing
* transfers, ungates the clock to the SPI module, resets the SPI module, initializes the module
* to user defined settings and default settings, configures the IRQ state structure, enables
* the module-level interrupt to the core, and enables the SPI module.
*
* This initialization function also configures the DMA module by requesting channels for DMA
* operation.
*
*END**************************************************************************/
spi_status_t SPI_DRV_DmaMasterInit(uint32_t instance, spi_dma_master_state_t * spiDmaState)
{
SPI_Type *base = g_spiBase[instance];
/* Clear the state for this instance.*/
memset(spiDmaState, 0, sizeof(* spiDmaState));
/* Enable clock for SPI*/
CLOCK_SYS_EnableSpiClock(instance);
/* configure the run-time state struct with the source clock value */
spiDmaState->spiSourceClock = CLOCK_SYS_GetSpiFreq(instance);
/* Reset the SPI module to it's default state, which includes SPI disabled */
SPI_HAL_Init(base);
/* Init the interrupt sync object.*/
if (OSA_SemaCreate(&spiDmaState->irqSync, 0) != kStatus_OSA_Success)
{
return kStatus_SPI_Error;
}
/* Set SPI to master mode */
SPI_HAL_SetMasterSlave(base, kSpiMaster);
/* Set slave select to automatic output mode */
SPI_HAL_SetSlaveSelectOutputMode(base, kSpiSlaveSelect_AutomaticOutput);
/* Set the SPI pin mode to normal mode */
SPI_HAL_SetPinMode(base, kSpiPinMode_Normal);
#if FSL_FEATURE_SPI_FIFO_SIZE
if (g_spiFifoSize[instance] != 0)
{
/* If SPI module contains a FIFO, enable it and set watermarks to half full/empty */
SPI_HAL_SetFifoMode(base, true, kSpiTxFifoOneHalfEmpty, kSpiRxFifoOneHalfFull);
/* Set the interrupt clearing mechansim select for later use in driver to clear
* status flags
*/
SPI_HAL_SetIntClearCmd(base, true);
}
#endif
/* Save runtime structure pointers to irq handler can point to the correct state structure*/
g_spiStatePtr[instance] = spiDmaState;
/*****************************************
* Request DMA channel for RX and TX FIFO
*****************************************/
/* This channel transfers data from RX FIFO to receiveBuffer */
if (instance == 0)
{
/* Request DMA channel for RX FIFO */
DMA_DRV_RequestChannel(kDmaAnyChannel, kDmaRequestMux0SPI0Rx, &spiDmaState->dmaReceive);
/* Request DMA channel for TX FIFO */
DMA_DRV_RequestChannel(kDmaAnyChannel, kDmaRequestMux0SPI0Tx, &spiDmaState->dmaTransmit);
}
#if (SPI_INSTANCE_COUNT > 1)
else
{
/* Request DMA channel for RX FIFO */
DMA_DRV_RequestChannel(kDmaAnyChannel, kDmaRequestMux0SPI1Rx, &spiDmaState->dmaReceive);
/* Request DMA channel for TX FIFO */
DMA_DRV_RequestChannel(kDmaAnyChannel, kDmaRequestMux0SPI1Tx, &spiDmaState->dmaTransmit);
}
#endif
/* Enable SPI interrupt.*/
INT_SYS_EnableIRQ(g_spiIrqId[instance]);
/* SPI system Enable */
SPI_HAL_Enable(base);
return kStatus_SPI_Success;
}
