/*FUNCTION**********************************************************************
*
* Function Name : DSPI_DRV_DmaMasterConfigureBus
* Description : Configures the DSPI port physical parameters to access a device on the bus with
* DMA support.
*
* The term "device" is used to indicate the SPI device for which the DSPI 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
* DSPI_DRV_DmaMasterTransferBlocking or DSPI_DRV_DmaMasterTransfer) or pass it in to the
* DSPI_DRV_DmaMasterConfigureBus function. The user can pass in a device structure to the
* transfer function which contains the parameters for the bus (the transfer function then calls
* 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
* structure in the transfer function (assuming they have called this configure bus function
* first). This is an example to set up the dspi_device_t structure to call
* the DSPI_DRV_DmaMasterConfigureBus function by passing in these parameters:
* dspi_dma_device_t spiDevice;
* spiDevice.dataBusConfig.bitsPerFrame = 16;
* spiDevice.dataBusConfig.clkPhase = kDspiClockPhase_FirstEdge;
* spiDevice.dataBusConfig.clkPolarity = kDspiClockPolarity_ActiveHigh;
* spiDevice.dataBusConfig.direction = kDspiMsbFirst;
* spiDevice.bitsPerSec = 50000;
* DSPI_DRV_DmaMasterConfigureBus(instance, &spiDevice, &calculatedBaudRate);
*
*END**************************************************************************/
dspi_status_t DSPI_DRV_DmaMasterConfigureBus(uint32_t instance,
const dspi_dma_device_t * device,
uint32_t * calculatedBaudRate)
{
assert(device);
/* instantiate local variable of type dspi_dma_master_state_t and point to global state */
dspi_dma_master_state_t * dspiDmaState = (dspi_dma_master_state_t *)g_dspiStatePtr[instance];
SPI_Type *base = g_dspiBase[instance];
dspi_status_t errorCode = kStatus_DSPI_Success;
/* Configure the bus to access the provided device.*/
*calculatedBaudRate = DSPI_HAL_SetBaudRate(base, dspiDmaState->whichCtar,
device->bitsPerSec, dspiDmaState->dspiSourceClock);
errorCode = DSPI_HAL_SetDataFormat(base, dspiDmaState->whichCtar, &device->dataBusConfig);
/* Check bits/frame number */
if (device->dataBusConfig.bitsPerFrame > 16)
{
errorCode = kStatus_DSPI_OutOfRange;
}
else
{
dspiDmaState->bitsPerFrame = device->dataBusConfig.bitsPerFrame; /* update bits/frame */
}
return errorCode;
}
void SpiFrequency(Spi_t *obj, uint32_t hz)
{
uint32_t dspiSourceClock;
uint32_t calculatedBaudRate;
if (!(obj->isSlave)) {
// Get DSPI source clock.
dspiSourceClock = CLOCK_SYS_GetSpiFreq(obj->instance);
calculatedBaudRate = DSPI_HAL_SetBaudRate(obj->Spi, kDspiCtar0, hz, dspiSourceClock);
PRINTF("Transfer at baudrate %lu \r\n", calculatedBaudRate);
}
}
void dspi_slave_setup(uint32_t instance, uint32_t baudrate)
{
dspi_data_format_config_t config;
uint32_t baseAddr = SPI0_BASE;
// Enable clock
CLOCK_SYS_EnableSpiClock(instance);
// Clear flags
DSPI_HAL_ClearStatusFlag(g_dspiBaseAddr[instance], kDspiTxComplete);
DSPI_HAL_ClearStatusFlag(g_dspiBaseAddr[instance], kDspiTxAndRxStatus);
DSPI_HAL_ClearStatusFlag(g_dspiBaseAddr[instance], kDspiEndOfQueue);
DSPI_HAL_ClearStatusFlag(g_dspiBaseAddr[instance], kDspiTxFifoUnderflow);
DSPI_HAL_ClearStatusFlag(g_dspiBaseAddr[instance], kDspiTxFifoFillRequest);
DSPI_HAL_ClearStatusFlag(g_dspiBaseAddr[instance], kDspiRxFifoOverflow);
DSPI_HAL_ClearStatusFlag(g_dspiBaseAddr[instance], kDspiRxFifoDrainRequest);
// Enable HAL
DSPI_HAL_Init(baseAddr);
DSPI_HAL_SetMasterSlaveMode(baseAddr, kDspiSlave);
DSPI_HAL_Enable(baseAddr);
// Disable transfer
DSPI_HAL_StopTransfer(baseAddr);
// PCS popularity
DSPI_HAL_SetPcsPolarityMode(baseAddr, kDspiPcs0, kDspiPcs_ActiveLow);
// CTAR
DSPI_HAL_SetBaudRate(baseAddr, kDspiCtar0, baudrate, 72000000);
config.bitsPerFrame = 16;
config.clkPhase = kDspiClockPhase_FirstEdge;
config.clkPolarity = kDspiClockPolarity_ActiveHigh;
config.direction = kDspiMsbFirst;
DSPI_HAL_SetDataFormat(baseAddr, kDspiCtar0, &config);
// Interrupt
INT_SYS_EnableIRQ(g_dspiIrqId[instance]);
DSPI_HAL_SetIntMode(g_dspiBaseAddr[instance], kDspiTxFifoUnderflow, false);
DSPI_HAL_SetIntMode(g_dspiBaseAddr[instance], kDspiTxFifoFillRequest, false);
// DMA
DSPI_HAL_SetTxFifoFillDmaIntMode(g_dspiBaseAddr[instance], kDspiGenerateIntReq, true);
DSPI_HAL_SetRxFifoDrainDmaIntMode(g_dspiBaseAddr[instance], kDspiGenerateDmaReq, true);
}
/*!
* @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++;
}
}
void spi_frequency(spi_t *obj, int hz) {
uint32_t busClock;
CLOCK_SYS_GetFreq(kBusClock, &busClock);
DSPI_HAL_SetBaudRate(obj->spi.address, kDspiCtar0, (uint32_t)hz, busClock);
}
