Hi NXP Team,
我用s32k144的SPI2总线操作AT45db041d存储芯片时，数据读写不成功，一直找不到原因，但是我用IO口模拟SPI操 作 AT45db041d存储芯片时是可以正常读写的，下面是我的SPI配置代码，麻烦各位大神指正下哪里配置的有问题。附 件为我的详细代码。
疑问1；AT45db041d的片选引脚连接的PA9，我是软件来操作，还需要配置成SPI2的复用功能吗，还是直接配置成普 通 IO口就行了，请大神解答？
void Spi2Init(void)
{
PCC-> PCCn[PCC_PORTA_INDEX] |= PCC_PCCn_CGC_MASK; /* Enable clock to PORT A */
PCC-> PCCn[PCC_PORTE_INDEX] |= PCC_PCCn_CGC_MASK; /* Enable clock to PORT E */
PORTA->PCR[9] |= PORT_PCR_MUX(3); //PCS0
PORTA->PCR[8] |= PORT_PCR_MUX(3); //SOUT
PORTE->PCR[16] |= PORT_PCR_MUX(3); //SIN
PORTE->PCR[15] |= PORT_PCR_MUX(3); //SCK
// iHalSetPinMode(PORT_A, PIN9, OUTPUT_PP);//Spi_CS
// iHalSetPin(PORT_A, PIN9); //
iHalSetPinMode(PORT_E, PIN11, OUTPUT_PP); //RST
iHalSetPin(PORT_E, PIN11);
PCC->PCCn[PCC_LPSPI2_INDEX] = 0; /* Disable clocks to modify PCS ( default) */
PCC->PCCn[PCC_LPSPI2_INDEX] = 0xC6000000; /* Enable PCS=SPLL_DIV2 (40 MHz func'l clock) */
LPSPI2->CR = 0x00000000; /* Disable module for configuration */
LPSPI2->IER = 0x00000000; /* Interrupts not used */
LPSPI2->DER = 0x00000000; /* DMA not used */
LPSPI2->CFGR0 = 0x00000000; /* Defaults: */
LPSPI2->CFGR1 = 0x00000001; /* Configurations: master mode*/
LPSPI2->TCR = 0x0000000F; /* Transmit cmd: PCS3, 16 bits, prescale func'l clk by 4, etc*/
LPSPI2->CCR = 0x04090808; /* Clock dividers based on prescaled func'l clk of 100 nsec */
LPSPI2->FCR = 0x00000003; /* RXWATER=0: Rx flags set when Rx FIFO >0 */
LPSPI2->CR = 0x00000001; /* Enable module for operation */
}
void SPI_WriteByte(uint8_t data)
{
while((LPSPI2->SR & LPSPI_SR_TDF_MASK) >> LPSPI_SR_TDF_SHIFT == 0);
LPSPI2->TDR = data; /* Transmit data */
LPSPI2->SR |= LPSPI_SR_TDF_MASK; /* Clear TDF flag */
}
uint8_t SPI_ReadByte(void)
{
uint8_t ucByte = 0;
while((LPSPI2->SR & LPSPI_SR_RDF_MASK) >> LPSPI_SR_RDF_SHIFT == 0);
ucByte = LPSPI2->RDR; /* Read received data */
LPSPI2->SR |= LPSPI_SR_RDF_MASK; /* Clear RDF flag */
return ucByte;
}
