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_MasterConfigureBus
* Description : Configures the SPI port to access a device on the bus.
* The term "device" is used to indicate the SPI device for which the SPI master is communicating.
* The user has two options to configure the device parameters: either pass in the
* pointer to the device configuration structure to the desired transfer function (see
* SPI_DRV_MasterTransferDataBlocking or SPI_DRV_MasterTransferData) or pass it in to the
* SPI_DRV_MasterConfigureBus function. The user can pass in a device structure to the transfer
* function which contains the parameters for the bus (the transfer function will then call
* this function). However, the user has the option to call this function directly especially
* to get the calculated baud rate, at which point they may pass in NULL for the device
* struct in the transfer function (assuming they have called this configure bus function
* first).
*
*END**************************************************************************/
void SPI_DRV_MasterConfigureBus(uint32_t instance,
const spi_master_user_config_t * device,
uint32_t * calculatedBaudRate)
{
assert(device);
/* instantiate local variable of type spi_master_state_t and point to global state */
spi_master_state_t * spiState = (spi_master_state_t *)g_spiStatePtr[instance];
SPI_Type *base = g_spiBase[instance];
/* Configure the bus to access the provided device.*/
*calculatedBaudRate = SPI_HAL_SetBaud(base, device->bitsPerSec, spiState->spiSourceClock);
SPI_HAL_SetDataFormat(base, device->polarity, device->phase, device->direction);
#if FSL_FEATURE_SPI_16BIT_TRANSFERS
SPI_HAL_Set8or16BitMode(base, device->bitCount);
#endif
}
/*FUNCTION**********************************************************************
*
* Function Name : SPI_DRV_DmaSlaveInit
* Description : Initializes the SPI module for slave mode.
* Saves the application callback info, turns on the clock to the module,
* enables the device, and enables interrupts. Sets the SPI to a slave mode.
*
*END**************************************************************************/
spi_status_t SPI_DRV_DmaSlaveInit(uint32_t instance, spi_dma_slave_state_t * spiState,
const spi_dma_slave_user_config_t * slaveConfig)
{
SPI_Type *base = g_spiBase[instance];
assert(slaveConfig);
assert(instance < SPI_INSTANCE_COUNT);
assert(spiState);
#if FSL_FEATURE_SPI_16BIT_TRANSFERS
if (slaveConfig->bitCount > kSpi16BitMode)
{
/* bits/frame larger than hardware support */
return kStatus_SPI_InvalidParameter;
}
#endif /* FSL_FEATURE_SPI_16BIT_TRANSFERS */
/* Check if the slave already initialized */
if (g_spiStatePtr[instance])
{
return kStatus_SPI_AlreadyInitialized;
}
/* Clear the state for this instance. */
memset(spiState, 0, sizeof(* spiState));
spiState->hasExtraByte = false;
/* Update dummy pattern value */
spiState->dummyPattern = slaveConfig->dummyPattern;
/* Enable clock for SPI */
CLOCK_SYS_EnableSpiClock(instance);
/* Reset the SPI module to its default settings including disabling SPI */
SPI_HAL_Init(base);
/* Initialize the event structure */
if (OSA_EventCreate(&spiState->event, kEventAutoClear) != kStatus_OSA_Success)
{
return kStatus_SPI_Error;
}
/* Set SPI to slave mode */
SPI_HAL_SetMasterSlave(base, kSpiSlave);
/* Configure the slave clock polarity, phase and data direction */
SPI_HAL_SetDataFormat(base, slaveConfig->polarity, slaveConfig->phase,
slaveConfig->direction);
/* Set the SPI pin mode to normal mode */
SPI_HAL_SetPinMode(base, kSpiPinMode_Normal);
#if FSL_FEATURE_SPI_16BIT_TRANSFERS
SPI_HAL_Set8or16BitMode(base, slaveConfig->bitCount);
#endif /* FSL_FEATURE_SPI_16BIT_TRANSFERS */
#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 /* FSL_FEATURE_SPI_FIFO_SIZE */
/*****************************************
* 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 */
if (kDmaInvalidChannel == DMA_DRV_RequestChannel(kDmaAnyChannel,
kDmaRequestMux0SPI0Rx,
&spiState->dmaReceive))
{
return kStatus_SPI_DMAChannelInvalid;
}
/* Request DMA channel for TX FIFO */
if (kDmaInvalidChannel == DMA_DRV_RequestChannel(kDmaAnyChannel,
kDmaRequestMux0SPI0Tx,
&spiState->dmaTransmit))
{
return kStatus_SPI_DMAChannelInvalid;
}
}
#if (SPI_INSTANCE_COUNT > 1)
else if (instance == 1)
{
/* Request DMA channel for RX FIFO */
if (kDmaInvalidChannel == DMA_DRV_RequestChannel(kDmaAnyChannel,
kDmaRequestMux0SPI1Rx,
&spiState->dmaReceive))
{
return kStatus_SPI_DMAChannelInvalid;
}
/* Request DMA channel for TX FIFO */
if (kDmaInvalidChannel == DMA_DRV_RequestChannel(kDmaAnyChannel,
kDmaRequestMux0SPI1Tx,
&spiState->dmaTransmit))
{
return kStatus_SPI_DMAChannelInvalid;
}
}
else
{
return kStatus_SPI_OutOfRange;
}
#endif
/* Save runtime structure pointers to irq handler can point to the correct state structure */
g_spiStatePtr[instance] = spiState;
/* Enable SPI interrupt. The transmit interrupt should immediately cause an interrupt
* which will fill in the transmit buffer and will be ready to send once the slave initiates
* transmission.
*/
INT_SYS_EnableIRQ(g_spiIrqId[instance]);
/* SPI module enable */
SPI_HAL_Enable(base);
return kStatus_SPI_Success;
}
/*!
* @brief SPI slave polling.
*
* This function sends back received buffer from master through SPI interface.
*/
int main (void)
{
uint32_t j;
SPI_Type * spiBaseAddr = g_spiBase[SPI_SLAVE_INSTANCE];
// init the hardware, this also sets up up the SPI pins for each specific SoC
hardware_init();
OSA_Init();
PRINTF("\r\nSPI board to board polling example");
PRINTF("\r\nThis example run on instance %d", (uint32_t)SPI_SLAVE_INSTANCE);
PRINTF("\r\nBe sure master's SPI%d and slave's SPI%d are connected",
(uint32_t)SPI_SLAVE_INSTANCE, (uint32_t)SPI_SLAVE_INSTANCE);
// Enable clock for SPI
CLOCK_SYS_EnableSpiClock(SPI_SLAVE_INSTANCE);
// Reset the SPI module to its default settings including disabling SPI
SPI_HAL_Init(spiBaseAddr);
// Set SPI to slave mode
SPI_HAL_SetMasterSlave(spiBaseAddr, kSpiSlave);
// Set the SPI pin mode to normal mode
SPI_HAL_SetPinMode(spiBaseAddr, kSpiPinMode_Normal);
#if FSL_FEATURE_SPI_FIFO_SIZE
if (g_spiFifoSize[SPI_SLAVE_INSTANCE] != 0)
{
// If SPI module contains a FIFO, disable it and set watermarks to half full/empty
SPI_HAL_SetFifoMode(spiBaseAddr, false, kSpiTxFifoOneHalfEmpty, kSpiRxFifoOneHalfFull);
}
#endif
//USER CONFIGURABLE OPTION FOR 8 or 16-BIT MODE (if applicable)
#if FSL_FEATURE_SPI_16BIT_TRANSFERS
SPI_HAL_Set8or16BitMode(spiBaseAddr, kSpi8BitMode);
#endif
// SPI system Enable
SPI_HAL_Enable(spiBaseAddr);
// Setup format as same as master
SPI_HAL_SetDataFormat(spiBaseAddr, kSpiClockPolarity_ActiveHigh, kSpiClockPhase_FirstEdge, kSpiMsbFirst);
while(1)
{
PRINTF("\r\nSlave example is running...\r\n");
// Reset the sink buffer
for (j = 0; j < TRANSFER_SIZE; j++)
{
s_spiSinkBuffer[j] = 0;
}
SPI_HAL_Disable(spiBaseAddr);
SPI_HAL_Enable(spiBaseAddr);
// Disable module to clear shift register
for (j = 0; j <TRANSFER_SIZE; j++)
{
// Check if data received
while(SPI_HAL_IsReadBuffFullPending(spiBaseAddr)==0){}
#if FSL_FEATURE_SPI_16BIT_TRANSFERS
// Read data from data register
s_spiSinkBuffer[j] = SPI_HAL_ReadDataLow(spiBaseAddr);
#else
s_spiSinkBuffer[j] = SPI_HAL_ReadData(spiBaseAddr);
#endif
}
// Disable module to clear shift register
SPI_HAL_Disable(spiBaseAddr);
SPI_HAL_Enable(spiBaseAddr);
// Send data back to master
for (j = 0; j <TRANSFER_SIZE; j++)
{
#if FSL_FEATURE_SPI_16BIT_TRANSFERS
SPI_HAL_WriteDataBlocking(spiBaseAddr, kSpi8BitMode, 0, s_spiSinkBuffer[j]);
#else
SPI_HAL_WriteDataBlocking(spiBaseAddr, s_spiSinkBuffer[j]);
#endif
}
// Print out receive buffer
PRINTF("\r\nSlave receive:");
for (j = 0; j < TRANSFER_SIZE; j++)
{
// Print 16 numbers in a line.
if ((j & 0x0F) == 0)
{
PRINTF("\r\n ");
}
PRINTF(" %02X", s_spiSinkBuffer[j]);
}
}
}