Posted on February 28, 2016 at 16:16Hallo,
I have a problem with SPI and DMA in interrupt mode. on my stm32l053. When I start SPI transmition, SCK and NSS pins looks ok, but there is nothing at MOSI line. I checked DR register but it is 0 during whole transmition. At the end I receive TCI interrupt from DMA (what would suggest that it transmited some data from memory to SPI_DR).
Below DMA Initialization:
void MX_DMA_Init(void)
{
__DMA1_CLK_ENABLE();
//Channel2 Rx
DMA1_Channel2->CCR |= (1 << MINC) | (1 << CIRC) |
(1 << TCIE);
DMA1_Channel3->CCR |= (1 << MINC) | (1 << CIRC) |
(1 << TCIE) | (1 << DIR);
// DMA1_Channel2->CNDTR = 5;
// DMA1_Channel3->CNDTR = 5;
DMA1_Channel2->CPAR = (uint32_t)(&(SPI1->DR));
DMA1_Channel3->CPAR = (uint32_t)(&(SPI1->DR));
DMA1_Channel2->CMAR = (uint32_t)(rxBuff);
DMA1_Channel3->CMAR = (uint32_t)(txBuff);
DMA1_CSELR->CSELR |= (1 << C2S0) | (1 << C3S0);
/* DMA interrupt init */
HAL_NVIC_SetPriority(DMA1_Channel2_3_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Channel2_3_IRQn);
}
SPI Initialization
void MX_SPI1_Init(void)
{
__SPI1_CLK_ENABLE();
SPI1->CR1 |= (1 << BR2) | (1 << CPHA) |
(1 << MSTR) | (1 << SSM) | (1 << SSI) | (1 << CPOL) | (1 << CPHA);
SPI1->CR2 |= ( 1 << SSOE);
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_SET);
SPI1->CR2 |= (1 << TXEIE) | (1 << RXNEIE);
// HAL_NVIC_SetPriority(SPI1_IRQn, 0, 0);
// HAL_NVIC_EnableIRQ(SPI1_IRQn);
}
and ISR for DMA TCIE
void DMA1_Channel2_3_IRQHandler(void)
{
if((DMA1->ISR >> TCIF3) & 1)
{
DMA1_Channel3->CCR &= ~(1 << EN);
DMA1->IFCR |= (1 << CTCIF3);
}
if((DMA1->ISR >> TCIF2) & 1)
{
DMA1_Channel2->CCR &= ~(1 << EN);
DMA1->IFCR |= (1 << CTCIF2);
while((SPI1->SR) >> BSY){}
StopSPI();
}
}
Could anybody suggest where to look for a problem?
Regards
#je-ne-l'aime-cube #no-hablo-hal
