problem of S32K144 LPSPI
I used GPIO PTB14，PTB15，PTB16，PTB17 as LPSPI1‘s Pin，SPI send is ok（the signa PCS is i simulate），
the send waveform like that
but after received six bytes，it rest on
while((LPSPI1->SR & LPSPI_SR_RDF_MASK)>>LPSPI_SR_RDF_SHIFT==0);
I found is the 
void Port_Init(void)
{
PCC->PCCn[PCC_PORTB_INDEX] |= PCC_PCCn_CGC_MASK; /*Enable clock for PORTB*/
PCC->PCCn[PCC_PORTA_INDEX] |= PCC_PCCn_CGC_MASK; /*Enable clock for PORTA*/
PORTB->PCR[14] |= PORT_PCR_MUX(3); /*PORT B14 :MUX = ALT3,LPSPI_SCK*/
PORTB->PCR[15] |= PORT_PCR_MUX(3); /*PORT B15 :MUX = ALT3,LPSPI_SIN*/
PORTB->PCR[16] |= PORT_PCR_MUX(3); /*PORT B16 :MUX = ALT3,LPSPI_SOUT*/
PORTB->PCR[17] |= PORT_PCR_MUX(3); /*PORT B17 :MUX = ALT3,LPSPI_PCS3*/
PORTA->PCR[6] |= PORT_PCR_MUX(3); /*PORT A6 :MUX = ALT3,LPSPI_PCS1*/
}
void LPSPI1_init_master(void)
{
PCC->PCCn[PCC_LPSPI1_INDEX] = 0; /* Disable clocks to modify PCS ( default) */
PCC->PCCn[PCC_LPSPI1_INDEX] = 0xC6000000; /* Enable PCS=SPLL_DIV2 (40 MHz func'l clock) */
LPSPI1->CR = 0x00000000; /* Disable module for configuration */
LPSPI1->IER = 0x00000000; /* Interrupts not used */
LPSPI1->DER = 0x00000000; /* DMA not used */
LPSPI1->CFGR0 = 0x00000000; /* Defaults: */
LPSPI1->CFGR1 = 0x00000009; /* Configurations: master mode*/ //1
LPSPI1->TCR = 0x2b000007; /* Transmit cmd: PCS3, 16bits, prescale func'l clk by 4. */
LPSPI1->CCR = 0x04090808; /* Clk dividers based on prescaled func'l clk of 100 nsec */
LPSPI1->FCR = 0x00000003; /* RXWATER=0: Rx flags set when Rx FIFO >0 *///3
LPSPI1->CR = 0x00000009; /* Enable module for operation */
}
void LPSPI1_Transmit_8bits (uint8_t *send,uint8_t len)
{
uint8_t i;
CS_LOW; //cs low
for(i = 0;i<len;i++)
{
while((LPSPI1->SR & LPSPI_SR_TDF_MASK)>>LPSPI_SR_TDF_SHIFT==0); // =0£» Transmit data not request
/* Wait for Tx FIFO available */
LPSPI1->TDR = send[i]; /* Transmit data */
LPSPI1->SR |= LPSPI_SR_TDF_MASK; /* Clear TDF flag */
count = LPSPI1->FSR; /*FSR returns the number of words currently stored in the transmit FIFO*/
}
Delay1ms(2); //delay
CS_HIGH; //cs high
}
uint8_t rece_count = 0;
void LPSPI1_Receive_8bits (uint8_t *receive,uint8_t len)
{
uint8_t i;
for(i = 0;i<len;i++)
{
uint16_t j;
rece_count = LPSPI1->SR; //bit0:1:TDF,Transmit data is request bit1:0:Receive Data is not ready
//while(((LPSPI1->SR & LPSPI_SR_RDF_MASK)>>LPSPI_SR_RDF_SHIFT==0) && j<5000)j++;
while((LPSPI1->SR & LPSPI_SR_RDF_MASK)>>LPSPI_SR_RDF_SHIFT==0); // = 0 Receive Data is not ready
receive[i] = LPSPI1->RDR;
LPSPI1->SR |= LPSPI_SR_RDF_MASK;
// rece_count = (LPSPI1->SR & LPSPI_SR_REF_MASK)>>LPSPI_SR_REF_SHIFT;//LPSPI1->RSR;
//rece_count = LPSPI1->FSR;
}
}
