Hi，
How to implement 2-bit transfer LPSPI on RT1011 platform.
RT1011 is set as SPI master to receive ADC data through 2-bit transfer SPI.
Only "0" s are received using the following code.
But LPSPI 1-bit transfer run well on my board ,when I change LPSPI_TCR_WIDTH(1); to LPSPI_TCR_WIDTH(0);I can get the right data.
what is the problem? thanks a lot.
//SPI initialization
void SPI_Init(void) {
lpspi_master_config_t masterConfig;
masterConfig.baudRate = 20000000;
masterConfig.bitsPerFrame = 128;
masterConfig.cpol = kLPSPI_ClockPolarityActiveLow;
masterConfig.cpha = kLPSPI_ClockPhaseFirstEdge;
masterConfig.direction = kLPSPI_MsbFirst;
masterConfig.pcsActiveHighOrLow = kLPSPI_PcsActiveLow;
masterConfig.pinCfg = kLPSPI_SdiInSdoOut;
masterConfig.dataOutConfig = kLpspiDataOutRetained;
LPSPI_MasterInit(LPSPI1, &masterConfig, ADC_LPSPI_CLOCK_FREQ);
LPSPI_DisableInterrupts(LPSPI1, kLPSPI_AllInterruptEnable);
LPSPI_SetMasterSlaveMode(LPSPI1, kLPSPI_Master);
LPSPI1->TCR =(LPSPI1->TCR &
~(LPSPI_TCR_CONT_MASK | LPSPI_TCR_CONTC_MASK | LPSPI_TCR_RXMSK_MASK | LPSPI_TCR_PCS_MASK | LPSPI_TCR_WIDTH_MASK)) |
LPSPI_TCR_CONT(0) | LPSPI_TCR_CONTC(0) | LPSPI_TCR_RXMSK(0) | LPSPI_TCR_TXMSK(1) | LPSPI_TCR_PCS(0)| LPSPI_TCR_WIDTH(1);
LPSPI1->CFGR1 |= LPSPI_CFGR1_OUTCFG_MASK;
LPSPI1->CR |= LPSPI_CR_MEN_MASK; /* Module is enabled */
}
//SPI read
void SPI_Read(void){
int data[4];
LPSPI_FlushFifo(LPSPI1,true,true);
// Write 0xFF for providing clock for read
LPSPI_WriteData(LPSPI1,0xFFFFFFFF);
LPSPI_WriteData(LPSPI1,0xFFFFFFFF);
LPSPI_WriteData(LPSPI1,0xFFFFFFFF);
LPSPI_WriteData(LPSPI1,0xFFFFFFFF);
// Wait until Tx clock have been completed
while(LPSPI_GetTxFifoCount(LPSPI1));
// Wait until Rx get data
while(LPSPI_GetRxFifoCount(ADC_LPSPI_MASTER_BASEADDR)!=4);
data[0]=LPSPI_ReadData(LPSPI1);
data[1]=LPSPI_ReadData(LPSPI1);
data[2]=LPSPI_ReadData(LPSPI1);
data[3]=LPSPI_ReadData(LPSPI1);
}
