Posted on March 02, 2015 at 05:59when i use SPI to receiver a byte from the external ADC chip, but the SPI_SR_RXNE can't be set after the data into the SPI_DR.the initialization code below:
void MX_SPI2_Config(void)
{
/* Enable the peripheral clock SPI2 */
RCC->APB1ENR |= RCC_APB1ENR_SPI2EN;
/* DISABLE TXE IT */
SPI2->CR2 &= ~(SPI_CR2_TXEIE | SPI_CR2_RXNEIE | SPI_CR2_ERRIE | SPI_CR2_FRF | SPI_CR2_SSOE | SPI_CR2_TXDMAEN | SPI_CR2_RXDMAEN);
/* MASTER MODE, SCK IDLE HIGH */
SPI2->CR1 |= (SPI_CR1_MSTR | SPI_CR1_CPOL);
/* NSS SOFT */
SPI2->CR1 |= (SPI_CR1_SSM | SPI_CR1_SSI);
/* RXNE IT */
SPI2->CR2 |= SPI_CR2_RXNEIE;
/* 16 bit frame mode */
SPI2->CR1 |= SPI_CR1_DFF;
/* Enable SPI2 */
SPI2->CR1 |= SPI_CR1_SPE;
/* Configure IT */
/* Set priority for SPI2_IRQn */
NVIC_SetPriority(SPI2_IRQn, 0);
/* Enable SPI2_IRQn */
NVIC_EnableIRQ(SPI2_IRQn);
}
void SPI2_IRQHandler(void)
{
if((SPI2->SR & SPI_SR_RXNE) == SPI_SR_RXNE)
{
SPI2_Data = SPI2->DR;
}
}
