void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk) {
// determine the SPI to use
uint32_t spi_mosi = pinmap_peripheral(mosi, PinMap_SPI_MOSI);
uint32_t spi_miso = pinmap_peripheral(miso, PinMap_SPI_MISO);
uint32_t spi_sclk = pinmap_peripheral(sclk, PinMap_SPI_SCLK);
uint32_t spi_data = pinmap_merge(spi_mosi, spi_miso);
obj->spi.instance = pinmap_merge(spi_data, spi_sclk);
MBED_ASSERT((int)obj->spi.instance != NC);
CLOCK_SYS_EnableSpiClock(obj->spi.instance);
uint32_t spi_address[] = SPI_BASE_ADDRS;
obj->spi.address = spi_address[obj->spi.instance];
DSPI_HAL_Init(obj->spi.address);
DSPI_HAL_Disable(obj->spi.address);
// set default format and frequency
spi_format(obj, 8, 0, SPI_MSB); // 8 bits, mode 0
DSPI_HAL_SetDelay(obj->spi.address, kDspiCtar0, 0, 0, kDspiPcsToSck);
spi_frequency(obj, 1000000);
DSPI_HAL_Enable(obj->spi.address);
DSPI_HAL_StartTransfer(obj->spi.address);
// pin out the spi pins
pinmap_pinout(mosi, PinMap_SPI_MOSI);
pinmap_pinout(miso, PinMap_SPI_MISO);
pinmap_pinout(sclk, PinMap_SPI_SCLK);
}
void SpiInit(Spi_t *obj, PinNames mosi, PinNames miso, PinNames sclk, PinNames nss)
{
/* Check if a proper channel was selected */
if (g_dspiBase[obj->instance] == NULL) return;
obj->Spi = g_dspiBase[obj->instance];
GpioInit(&obj->Mosi, mosi, PIN_ALTERNATE_FCT, PIN_PUSH_PULL, PIN_PULL_DOWN, 0);
GpioInit(&obj->Miso, miso, PIN_ALTERNATE_FCT, PIN_PUSH_PULL, PIN_PULL_DOWN, 0);
GpioInit(&obj->Sclk, sclk, PIN_ALTERNATE_FCT, PIN_PUSH_PULL, PIN_PULL_DOWN, 0);
if (nss != NC) GpioInit(&obj->Nss, nss, PIN_ALTERNATE_FCT, PIN_PUSH_PULL, PIN_PULL_UP, 1);
if (!obj->isSlave) {
// Enable DSPI clock.
CLOCK_SYS_EnableSpiClock(obj->instance);
// Initialize the DSPI module registers to default value, which disables the module
DSPI_HAL_Init(obj->Spi);
// Set to master mode.
DSPI_HAL_SetMasterSlaveMode(obj->Spi, kDspiMaster);
// Configure for continuous SCK operation
DSPI_HAL_SetContinuousSckCmd(obj->Spi, false);
// Configure for peripheral chip select polarity
DSPI_HAL_SetPcsPolarityMode(obj->Spi, kDspiPcs0, kDspiPcs_ActiveLow);
// Disable FIFO operation.
DSPI_HAL_SetFifoCmd(obj->Spi, false, false);
// Initialize the configurable delays: PCS-to-SCK, prescaler = 0, scaler = 1
DSPI_HAL_SetDelay(obj->Spi, kDspiCtar0, 0, 1, kDspiPcsToSck);
// DSPI system enable
DSPI_HAL_Enable(obj->Spi);
// 8 bits, CPOL = 0, CPHA = 0, MASTER
SpiFormat(obj, 8, 0, 0, 0);
} else {
// 8 bits, CPOL = 0, CPHA = 0, SLAVE
SpiFormat(obj, 8, 0, 0, 1);
}
SpiFrequency(obj, 10000000);
}
/*!
* @brief DSPI master Polling.
*
* Thid function uses DSPI master to send an array to slave
* and receive the array back from slave,
* thencompare whether the two buffers are the same.
*/
int main(void)
{
uint32_t i;
uint32_t loopCount = 1;
SPI_Type * dspiBaseAddr = (SPI_Type*)SPI0_BASE;
uint32_t dspiSourceClock;
uint32_t calculatedBaudRate;
dspi_device_t masterDevice;
dspi_command_config_t commandConfig =
{
.isChipSelectContinuous = false,
.whichCtar = kDspiCtar0,
.whichPcs = kDspiPcs0,
.clearTransferCount = true,
.isEndOfQueue = false
};
// Init hardware
hardware_init();
// Init OSA layer, used in DSPI_DRV_MasterTransferBlocking.
OSA_Init();
// Call this function to initialize the console UART. This function
// enables the use of STDIO functions (printf, scanf, etc.)
dbg_uart_init();
// Print a note.
printf("\r\n DSPI board to board polling example");
printf("\r\n This example run on instance 0 ");
printf("\r\n Be sure DSPI0-DSPI0 are connected ");
// Configure SPI pins.
configure_spi_pins(DSPI_MASTER_INSTANCE);
// Enable DSPI clock.
CLOCK_SYS_EnableSpiClock(DSPI_MASTER_INSTANCE);
// Initialize the DSPI module registers to default value, which disables the module
DSPI_HAL_Init(dspiBaseAddr);
// Set to master mode.
DSPI_HAL_SetMasterSlaveMode(dspiBaseAddr, kDspiMaster);
// Configure for continuous SCK operation
DSPI_HAL_SetContinuousSckCmd(dspiBaseAddr, false);
// Configure for peripheral chip select polarity
DSPI_HAL_SetPcsPolarityMode(dspiBaseAddr, kDspiPcs0, kDspiPcs_ActiveLow);
// Disable FIFO operation.
DSPI_HAL_SetFifoCmd(dspiBaseAddr, false, false);
// Initialize the configurable delays: PCS-to-SCK, prescaler = 0, scaler = 1
DSPI_HAL_SetDelay(dspiBaseAddr, kDspiCtar0, 0, 1, kDspiPcsToSck);
// DSPI system enable
DSPI_HAL_Enable(dspiBaseAddr);
// Configure baudrate.
masterDevice.dataBusConfig.bitsPerFrame = 8;
masterDevice.dataBusConfig.clkPhase = kDspiClockPhase_FirstEdge;
masterDevice.dataBusConfig.clkPolarity = kDspiClockPolarity_ActiveHigh;
masterDevice.dataBusConfig.direction = kDspiMsbFirst;
DSPI_HAL_SetDataFormat(dspiBaseAddr, kDspiCtar0, &masterDevice.dataBusConfig);
// Get DSPI source clock.
dspiSourceClock = CLOCK_SYS_GetSpiFreq(DSPI_MASTER_INSTANCE);
calculatedBaudRate = DSPI_HAL_SetBaudRate(dspiBaseAddr, kDspiCtar0, TRANSFER_BAUDRATE, dspiSourceClock);
printf("\r\n Transfer at baudrate %lu \r\n", calculatedBaudRate);
while(1)
{
// Initialize the transmit buffer.
for (i = 0; i < TRANSFER_SIZE; i++)
{
sendBuffer[i] = i + loopCount;
}
// Print out transmit buffer.
printf("\r\n Master transmit:");
for (i = 0; i < TRANSFER_SIZE; i++)
{
// Print 16 numbers in a line.
if ((i & 0x0F) == 0)
{
printf("\r\n ");
}
printf(" %02X", sendBuffer[i]);
}
// Reset the receive buffer.
for (i = 0; i < TRANSFER_SIZE; i++)
{
receiveBuffer[i] = 0;
}
// Restart the transfer by stop then start again, this will clear out the shift register
DSPI_HAL_StopTransfer(dspiBaseAddr);
// Flush the FIFOs
DSPI_HAL_SetFlushFifoCmd(dspiBaseAddr, true, true);
// Clear status flags that may have been set from previous transfers.
DSPI_HAL_ClearStatusFlag(dspiBaseAddr, kDspiTxComplete);
DSPI_HAL_ClearStatusFlag(dspiBaseAddr, kDspiEndOfQueue);
DSPI_HAL_ClearStatusFlag(dspiBaseAddr, kDspiTxFifoUnderflow);
DSPI_HAL_ClearStatusFlag(dspiBaseAddr, kDspiTxFifoFillRequest);
DSPI_HAL_ClearStatusFlag(dspiBaseAddr, kDspiRxFifoOverflow);
DSPI_HAL_ClearStatusFlag(dspiBaseAddr, kDspiRxFifoDrainRequest);
// Clear the transfer count.
DSPI_HAL_PresetTransferCount(dspiBaseAddr, 0);
// Start the transfer process in the hardware
DSPI_HAL_StartTransfer(dspiBaseAddr);
// Send the data to slave.
for (i = 0; i < TRANSFER_SIZE; i++)
{
// Write data to PUSHR
DSPI_HAL_WriteDataMastermodeBlocking(dspiBaseAddr, &commandConfig, sendBuffer[i]);
// Delay to wait slave is ready.
OSA_TimeDelay(1);
}
// Delay to wait slave is ready.
OSA_TimeDelay(10);
// Restart the transfer by stop then start again, this will clear out the shift register
DSPI_HAL_StopTransfer(dspiBaseAddr);
// Flush the FIFOs
DSPI_HAL_SetFlushFifoCmd(dspiBaseAddr, true, true);
//Clear status flags that may have been set from previous transfers.
DSPI_HAL_ClearStatusFlag(dspiBaseAddr, kDspiTxComplete);
DSPI_HAL_ClearStatusFlag(dspiBaseAddr, kDspiEndOfQueue);
DSPI_HAL_ClearStatusFlag(dspiBaseAddr, kDspiTxFifoUnderflow);
DSPI_HAL_ClearStatusFlag(dspiBaseAddr, kDspiTxFifoFillRequest);
DSPI_HAL_ClearStatusFlag(dspiBaseAddr, kDspiRxFifoOverflow);
DSPI_HAL_ClearStatusFlag(dspiBaseAddr, kDspiRxFifoDrainRequest);
// Clear the transfer count.
DSPI_HAL_PresetTransferCount(dspiBaseAddr, 0);
// Start the transfer process in the hardware
DSPI_HAL_StartTransfer(dspiBaseAddr);
// Receive the data from slave.
for (i = 0; i < TRANSFER_SIZE; i++)
{
// Write command to PUSHR.
DSPI_HAL_WriteDataMastermodeBlocking(dspiBaseAddr, &commandConfig, 0);
// Check RFDR flag
while (DSPI_HAL_GetStatusFlag(dspiBaseAddr, kDspiRxFifoDrainRequest)== false)
{}
// Read data from POPR
receiveBuffer[i] = DSPI_HAL_ReadData(dspiBaseAddr);
// Clear RFDR flag
DSPI_HAL_ClearStatusFlag(dspiBaseAddr,kDspiRxFifoDrainRequest);
// Delay to wait slave is ready.
OSA_TimeDelay(1);
}
// Print out receive buffer.
printf("\r\n Master receive:");
for (i = 0; i < TRANSFER_SIZE; i++)
{
// Print 16 numbers in a line.
if ((i & 0x0F) == 0)
{
printf("\r\n ");
}
printf(" %02X", receiveBuffer[i]);
}
// Check receiveBuffer.
for (i = 0; i < TRANSFER_SIZE; ++i)
{
if (receiveBuffer[i] != sendBuffer[i])
{
// Master received incorrect.
printf("\r\n ERROR: master received incorrect ");
return -1;
}
}
printf("\r\n DSPI Master Sends/ Recevies Successfully");
// Wait for press any key.
printf("\r\n Press any key to run again");
getchar();
// Increase loop count to change transmit buffer.
loopCount++;
}
}
/*FUNCTION**********************************************************************
*
* Function Name : DSPI_DRV_DmaMasterInit
* Description : Initializes a DSPI 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 DSPI module, resets the DSPI 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 DSPI module.
* The CTAR parameter is special in that it allows the user to have different SPI devices
* connected to the same DSPI module instance in addition to different peripheral chip
* selects. Each CTAR contains the bus attributes associated with that particular SPI device.
* For most use cases where only one SPI device is connected per DSPI module
* instance, use CTAR0.
* This is an example to set up and call the DSPI_DRV_DmaMasterInit function by passing
* in these parameters:
* dspi_dma_master_state_t dspiDmaState; <- the user simply allocates memory for this struct
* uint32_t calculatedBaudRate;
* dspi_dma_master_user_config_t userConfig; <- the user fills out members for this struct
* userConfig.isChipSelectContinuous = false;
* userConfig.isSckContinuous = false;
* userConfig.pcsPolarity = kDspiPcs_ActiveLow;
* userConfig.whichCtar = kDspiCtar0;
* userConfig.whichPcs = kDspiPcs0;
* DSPI_DRV_DmaMasterInit(masterInstance, &dspiDmaState, &userConfig);
*
*END**************************************************************************/
dspi_status_t DSPI_DRV_DmaMasterInit(uint32_t instance,
dspi_dma_master_state_t * dspiDmaState,
const dspi_dma_master_user_config_t * userConfig)
{
uint32_t dspiSourceClock;
SPI_Type *base = g_dspiBase[instance];
dma_request_source_t dspiTxDmaRequest = kDmaRequestMux0Disable;
dma_request_source_t dspiRxDmaRequest = kDmaRequestMux0Disable;
/* Check parameter pointers to make sure there are not NULL */
if ((dspiDmaState == NULL) || (userConfig == NULL))
{
return kStatus_DSPI_InvalidParameter;
}
/* Clear the run-time state struct for this instance.*/
memset(dspiDmaState, 0, sizeof(* dspiDmaState));
/* Note, remember to first enable clocks to the DSPI module before making any register accesses
* Enable clock for DSPI
*/
CLOCK_SYS_EnableSpiClock(instance);
/* Get module clock freq*/
dspiSourceClock = CLOCK_SYS_GetSpiFreq(instance);
/* Configure the run-time state struct with the DSPI source clock */
dspiDmaState->dspiSourceClock = dspiSourceClock;
/* Configure the run-time state struct with the data command parameters*/
dspiDmaState->whichCtar = userConfig->whichCtar; /* set the dspiDmaState struct CTAR*/
dspiDmaState->whichPcs = userConfig->whichPcs; /* set the dspiDmaState struct whichPcs*/
dspiDmaState->isChipSelectContinuous = userConfig->isChipSelectContinuous; /* continuous PCS*/
/* Initialize the DSPI module registers to default value, which disables the module */
DSPI_HAL_Init(base);
/* Init the interrupt sync object.*/
if (OSA_SemaCreate(&dspiDmaState->irqSync, 0) != kStatus_OSA_Success)
{
return kStatus_DSPI_Error;
}
/* Set to master mode.*/
DSPI_HAL_SetMasterSlaveMode(base, kDspiMaster);
/* Configure for continuous SCK operation*/
DSPI_HAL_SetContinuousSckCmd(base, userConfig->isSckContinuous);
/* Configure for peripheral chip select polarity*/
DSPI_HAL_SetPcsPolarityMode(base, userConfig->whichPcs, userConfig->pcsPolarity);
/* Enable fifo operation (regardless of FIFO depth) */
DSPI_HAL_SetFifoCmd(base, true, true);
/* Initialize the configurable delays: PCS-to-SCK, prescaler = 0, scaler = 1 */
DSPI_HAL_SetDelay(base, userConfig->whichCtar, 0, 1, kDspiPcsToSck);
/* Save runtime structure pointers to irq handler can point to the correct state structure*/
g_dspiStatePtr[instance] = dspiDmaState;
/* enable the interrupt*/
INT_SYS_EnableIRQ(g_dspiIrqId[instance]);
/* DSPI system enable */
DSPI_HAL_Enable(base);
/* Request DMA channels from the DMA peripheral driver.
* Note, some MCUs have a separate RX and TX DMA request for each DSPI instance, while
* other MCUs have a separate RX and TX DMA request for DSPI instance 0 only and shared DMA
* requests for all other instances. Therefore, use the DSPI feature file to distinguish
* how to request DMA channels between the various MCU DSPI instances.
* For DSPI instances with shared RX/TX DMA requests, we'll use the RX DMA request to
* trigger ongoing transfers and will link to the TX DMA channel from the RX DMA channel.
*/
switch (instance)
{
case 0:
/* SPI0 */
#if FSL_FEATURE_DSPI_HAS_SEPARATE_DMA_RX_TX_REQn(0)
dspiRxDmaRequest = kDmaRequestMux0SPI0Rx;
dspiTxDmaRequest = kDmaRequestMux0SPI0Tx;
#else
/* DMA is simple link control, so DSPI - DMA driver does not support the case that DSPI have
* shared DMA channels
*/
return kStatus_DSPI_DMAChannelInvalid;
#endif
break;
#if (SPI_INSTANCE_COUNT > 1)
case 1:
/* SPI1 */
#if FSL_FEATURE_DSPI_HAS_SEPARATE_DMA_RX_TX_REQn(1)
dspiRxDmaRequest = kDmaRequestMux0SPI1Rx;
dspiTxDmaRequest = kDmaRequestMux0SPI1Tx;
#else
/* DMA is simple link control, so DSPI - DMA driver does not support the case that DSPI have
* shared DMA channels
*/
return kStatus_DSPI_DMAChannelInvalid;
#endif
break;
#endif
#if (SPI_INSTANCE_COUNT > 2)
case 2:
/* SPI2 */
#if FSL_FEATURE_DSPI_HAS_SEPARATE_DMA_RX_TX_REQn(2)
dspiRxDmaRequest = kDmaRequestMux0SPI2Rx;
dspiTxDmaRequest = kDmaRequestMux0SPI2Tx;
#else
/* DMA is simple link control, so DSPI - DMA driver does not support the case that DSPI have
* shared DMA channels
*/
return kStatus_DSPI_DMAChannelInvalid;
#endif
break;
#endif
default :
return kStatus_DSPI_InvalidInstanceNumber;
}
/* This channel transfers data from RX FIFO to receiveBuffer */
if (kDmaInvalidChannel == DMA_DRV_RequestChannel(kDmaAnyChannel,
dspiRxDmaRequest,
&dspiDmaState->dmaRxChannel))
{
return kStatus_DSPI_DMAChannelInvalid;
}
/* This channel transfers data from transmitBuffer to TX FIFO */
if (kDmaInvalidChannel == DMA_DRV_RequestChannel(kDmaAnyChannel,
dspiTxDmaRequest,
&dspiDmaState->dmaTxDataChannel))
{
return kStatus_DSPI_DMAChannelInvalid;
}
/* Source buffer to intermediate command/data
* This channel is not activated by dma request, but by channel link.
*/
if (DMA_DRV_RequestChannel(kDmaAnyChannel,
kDmaRequestMux0Disable,
&dspiDmaState->dmaTxCmdChannel) == kDmaInvalidChannel)
{
return kStatus_DSPI_DMAChannelInvalid;
}
/* Start the transfer process in the hardware */
DSPI_HAL_StartTransfer(base);
return kStatus_DSPI_Success;
}
/*************************************************************************
* Function Name: SPI0_init
* Parameters: none
* Return: none
* Description: SPI initialization
*************************************************************************/
void SPI0_init(void)
{
dspi_baud_rate_divisors_t divisors;
divisors.doubleBaudRate = 0;
divisors.baudRateDivisor = 3;
divisors.prescaleDivisor = 3;
dspi_data_format_config_t config;
config.clkPhase = kDspiClockPhase_SecondEdge;
config.bitsPerFrame = 8;
config.clkPolarity = kDspiClockPolarity_ActiveHigh;
config.direction = kDspiMsbFirst;
#if defined(KV10Z7_SERIES)
PORT_HAL_SetMuxMode(PORTC_BASE_PTR,2,kPortMuxAsGpio);// MC33937 RESET
GPIO_HAL_SetPinDir(GPIOC_BASE_PTR, 2, kGpioDigitalOutput);
PORT_HAL_SetMuxMode(PORTD_BASE_PTR,7,kPortMuxAsGpio);// MC33937 DRV_EN
GPIO_HAL_SetPinDir(GPIOD_BASE_PTR, 7, kGpioDigitalOutput);
#elif (defined(KV10Z1287_SERIES) || defined(KV11Z7_SERIES))
PORT_HAL_SetMuxMode(PORTE_BASE_PTR,29,kPortMuxAsGpio);// MC33937 DRV_EN
GPIO_HAL_SetPinDir(GPIOE_BASE_PTR, 29, kGpioDigitalOutput);
#endif
GPIO_HAL_SetPinOutput(GPIOC_BASE_PTR, 2);//MC33937_RESET_HIGH;
#if defined(KV10Z7_SERIES)
GPIO_HAL_SetPinOutput(GPIOD_BASE_PTR, 7);//MC33937_ENABLE_HIGH;
#elif (defined(KV10Z1287_SERIES) || defined(KV11Z7_SERIES))
GPIO_HAL_SetPinOutput(GPIOE_BASE_PTR, 29);
#endif
DSPI_HAL_StopTransfer(SPI0_BASE_PTR);// halt SPI before SPI setting
DSPI_HAL_Enable(SPI0_BASE_PTR);//Enables the DSPI peripheral and sets the MCR MDIS to 0.
DSPI_HAL_SetMasterSlaveMode(SPI0_BASE_PTR, kDspiMaster);//Enable Master Mode
DSPI_HAL_SetPcsPolarityMode(SPI0_BASE_PTR, kDspiPcs0,kDspiPcs_ActiveLow);//The setting for either "active high, inactive low (0)" or "active low, inactive high(1)" of type dspi_pcs_polarity_config_t.
DSPI_HAL_SetFifoCmd(SPI0_BASE_PTR, false, false);//Disable the DSPI FIFOs.
DSPI_HAL_PresetTransferCount(SPI0_BASE_PTR, 0x0000);//Pre-sets the transfer count.
DSPI_HAL_SetDelay(SPI0_BASE_PTR, kDspiCtar0,3,0, kDspiPcsToSck); // CTAR0 selection option for master or slave mode
DSPI_HAL_SetDelay(SPI0_BASE_PTR, kDspiCtar0,2,0, kDspiLastSckToPcs);
DSPI_HAL_SetDelay(SPI0_BASE_PTR, kDspiCtar0,0,2, kDspiAfterTransfer);
DSPI_HAL_SetBaudDivisors(SPI0_BASE_PTR, kDspiCtar0, &divisors);
DSPI_HAL_SetDataFormat(SPI0_BASE_PTR, kDspiCtar0, &config);
DSPI_HAL_ClearStatusFlag(SPI0_BASE_PTR ,kDspiTxComplete);///*!< TCF status/interrupt enable */
DSPI_HAL_ClearStatusFlag(SPI0_BASE_PTR ,kDspiEndOfQueue);///*!< EOQF status/interrupt enable*/
DSPI_HAL_ClearStatusFlag(SPI0_BASE_PTR ,kDspiTxFifoUnderflow);///*!< TFUF status/interrupt enable*/
DSPI_HAL_ClearStatusFlag(SPI0_BASE_PTR ,kDspiTxFifoFillRequest);///*!< TFFF status/interrupt enable*/
DSPI_HAL_ClearStatusFlag(SPI0_BASE_PTR ,kDspiRxFifoOverflow);///*!< RFOF status/interrupt enable*/
DSPI_HAL_SetIntMode(SPI0_BASE_PTR,kDspiTxComplete, false);/*!< TCF status/interrupt disable */
DSPI_HAL_SetIntMode(SPI0_BASE_PTR,kDspiEndOfQueue, false);/*!< EOQF status/interrupt disable */
DSPI_HAL_SetIntMode(SPI0_BASE_PTR,kDspiTxFifoUnderflow, false);/*!< TFUF status/interrupt disable*/
DSPI_HAL_SetIntMode(SPI0_BASE_PTR,kDspiTxFifoFillRequest, false);/*!< TFFF status/interrupt disable*/
DSPI_HAL_SetIntMode(SPI0_BASE_PTR,kDspiRxFifoOverflow, false);/*!< RFOF status/interrupt disable*/
DSPI_HAL_SetIntMode(SPI0_BASE_PTR,kDspiRxFifoDrainRequest, false);/*!< RFDF status/interrupt disable*/
DSPI_HAL_StartTransfer(SPI0_BASE_PTR);// Starts the DSPI transfers, clears HALT bit in MCR.
PORT_HAL_SetMuxMode(PORTD_BASE_PTR, 3, kPortMuxAlt2);
PORT_HAL_SetMuxMode(PORTD_BASE_PTR, 2, kPortMuxAlt2);
PORT_HAL_SetMuxMode(PORTC_BASE_PTR, 0, kPortMuxAlt7);
PORT_HAL_SetMuxMode(PORTC_BASE_PTR, 5, kPortMuxAlt2);
}
/*FUNCTION**********************************************************************
*
* Function Name : DSPI_DRV_MasterInit
* Description : Initialize a DSPI instance for master mode operation.
* This function uses a CPU interrupt driven method for transferring data.
* This function will initialize the run-time state structure to keep track of the on-going
* transfers, ungate the clock to the DSPI module, reset the DSPI module, initialize the module
* to user defined settings and default settings, configure the IRQ state structure and enable
* the module-level interrupt to the core, and enable the DSPI module.
* The CTAR parameter is special in that it allows the user to have different SPI devices
* connected to the same DSPI module instance in conjunction with different peripheral chip
* selects. Each CTAR contains the bus attributes associated with that particular SPI device.
* For simplicity and for most use cases where only one SPI device is connected per DSPI module
* instance, it is recommended to use CTAR0.
* The following is an example of how to set up the dspi_master_state_t and the
* dspi_master_user_config_t parameters and how to call the DSPI_DRV_MasterInit function by passing
* in these parameters:
* dspi_master_state_t dspiMasterState; <- the user simply allocates memory for this struct
* uint32_t calculatedBaudRate;
* dspi_master_user_config_t userConfig; <- the user fills out members for this struct
* userConfig.isChipSelectContinuous = false;
* userConfig.isSckContinuous = false;
* userConfig.pcsPolarity = kDspiPcs_ActiveLow;
* userConfig.whichCtar = kDspiCtar0;
* userConfig.whichPcs = kDspiPcs0;
* DSPI_DRV_MasterInit(masterInstance, &dspiMasterState, &userConfig);
*
*END**************************************************************************/
dspi_status_t DSPI_DRV_MasterInit(uint32_t instance,
dspi_master_state_t * dspiState,
const dspi_master_user_config_t * userConfig)
{
uint32_t dspiSourceClock;
dspi_status_t errorCode = kStatus_DSPI_Success;
SPI_Type *base = g_dspiBase[instance];
/* Clear the run-time state struct for this instance.*/
memset(dspiState, 0, sizeof(* dspiState));
/* Note, remember to first enable clocks to the DSPI module before making any register accesses
* Enable clock for DSPI
*/
CLOCK_SYS_EnableSpiClock(instance);
/* Get module clock freq*/
dspiSourceClock = CLOCK_SYS_GetSpiFreq(instance);
/* Configure the run-time state struct with the DSPI source clock */
dspiState->dspiSourceClock = dspiSourceClock;
/* Configure the run-time state struct with the data command parameters*/
dspiState->whichCtar = userConfig->whichCtar; /* set the dspiState struct CTAR*/
dspiState->whichPcs = userConfig->whichPcs; /* set the dspiState struct whichPcs*/
dspiState->isChipSelectContinuous = userConfig->isChipSelectContinuous; /* continuous PCS*/
/* Initialize the DSPI module registers to default value, which disables the module */
DSPI_HAL_Init(base);
/* Init the interrupt sync object.*/
OSA_SemaCreate(&dspiState->irqSync, 0);
/* Initialize the DSPI module with user config */
/* Set to master mode.*/
DSPI_HAL_SetMasterSlaveMode(base, kDspiMaster);
/* Configure for continuous SCK operation*/
DSPI_HAL_SetContinuousSckCmd(base, userConfig->isSckContinuous);
/* Configure for peripheral chip select polarity*/
DSPI_HAL_SetPcsPolarityMode(base, userConfig->whichPcs, userConfig->pcsPolarity);
/* Enable fifo operation (regardless of FIFO depth) */
DSPI_HAL_SetFifoCmd(base, true, true);
/* Initialize the configurable delays: PCS-to-SCK, prescaler = 0, scaler = 1 */
DSPI_HAL_SetDelay(base, userConfig->whichCtar, 0, 1, kDspiPcsToSck);
/* Save runtime structure pointers to irq handler can point to the correct state structure*/
g_dspiStatePtr[instance] = dspiState;
/* enable the interrupt*/
INT_SYS_EnableIRQ(g_dspiIrqId[instance]);
/* DSPI system enable */
DSPI_HAL_Enable(base);
/* Start the transfer process in the hardware */
DSPI_HAL_StartTransfer(base);
return errorCode;
}