Posted on September 07, 2016 at 14:46
Hello, I have a problem with SPI communication for stm32f746-discovery board. I didnt read any value, and when I looked NSS pin is not moving. Only clock is running. SPI is in receive mode only. Function hw_spi_communination() is called on every 1ms.
static void hw_spi_result()
{
for (i = 0; i <
5
; i++)
{
spi_res += spi_convert_value[i];
}
spi_status->result = spi_res / 5;
}
void HAL_SPI_MspInit(SPI_HandleTypeDef *hspi)
{
GPIO_InitTypeDef gpio_instruct;
//Enable RX clock for SPI
__HAL_RCC_GPIOI_CLK_ENABLE(); // Enable SCK clk
__HAL_RCC_GPIOB_CLK_ENABLE(); // Enable MISO pin
// Enable SPI2 clock
__HAL_RCC_SPI2_CLK_ENABLE();
// Enable DMA clock
__HAL_RCC_DMA1_CLK_ENABLE();
// SPI SCK pin init
gpio_instruct.Pin = GPIO_PIN_1|GPIO_PIN_0;
gpio_instruct.Mode = GPIO_MODE_AF_PP;
gpio_instruct.Pull = GPIO_PULLUP;
gpio_instruct.Speed = GPIO_SPEED_HIGH;
gpio_instruct.Alternate = GPIO_AF5_SPI2;
HAL_GPIO_Init(GPIOI, &gpio_instruct);
// SPI MISO gpio pin init
gpio_instruct.Pin = GPIO_PIN_14;
gpio_instruct.Alternate = GPIO_AF5_SPI2;
HAL_GPIO_Init(GPIOB, &gpio_instruct);
// Config DMA for receive process
dma_handler_rx.Instance = DMA1_Stream3;
dma_handler_rx.Init.Channel = DMA_CHANNEL_0;
dma_handler_rx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
dma_handler_rx.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;
dma_handler_rx.Init.MemBurst = DMA_MBURST_SINGLE;
dma_handler_rx.Init.PeriphBurst = DMA_PBURST_SINGLE;
dma_handler_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;
dma_handler_rx.Init.PeriphInc = DMA_PINC_DISABLE;
dma_handler_rx.Init.MemInc = DMA_MINC_ENABLE;
dma_handler_rx.Init.PeriphDataAlignment = DMA_MDATAALIGN_BYTE;
dma_handler_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
dma_handler_rx.Init.Mode = DMA_CIRCULAR;
dma_handler_rx.Init.Priority = DMA_PRIORITY_MEDIUM;
HAL_DMA_Init(&dma_handler_rx);
// Associate the initialized DMA handle to the the SPI handle
__HAL_LINKDMA(hspi, hdmarx, dma_handler_rx);
// Set DMA1 stream 3 priority.
// When 2 interrupts have same preemption priority, then he one who has higher sub priority will be execute first.
// If both interrupts both have same preemption priority and sub priority, the one comes first will be execute first
HAL_NVIC_SetPriority(DMA1_Stream3_IRQn, 1, 0);
HAL_NVIC_EnableIRQ(DMA1_Stream3_IRQn);
// Set SPI2 receive priority.
// When 2 interrupts have same preemption priority, then he one who has higher sub priority will be execute first.
// If both interrupts both have same preemption priority and sub priority, the one comes first will be execute first
HAL_NVIC_SetPriority(SPI2_IRQn, 1, 0);
HAL_NVIC_EnableIRQ(SPI2_IRQn);
}
void hw_spi_init()
{
spi_handler.Instance = SPI2;
spi_handler.Init.Mode = SPI_MODE_MASTER;
spi_handler.Init.Direction = SPI_DIRECTION_2LINES_RXONLY; // Receive mode only
spi_handler.Init.DataSize = SPI_DATASIZE_8BIT;
spi_handler.Init.CLKPolarity = SPI_POLARITY_HIGH;
spi_handler.Init.CLKPhase = SPI_PHASE_1EDGE;
spi_handler.Init.NSS = SPI_NSS_SOFT;
spi_handler.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_64; // Baud rate = APB1 / BRprescaler. Max Fsample of MCP3301 is 1,7MHz
spi_handler.Init.FirstBit = SPI_FIRSTBIT_MSB;
spi_handler.Init.TIMode = SPI_TIMODE_DISABLE;
spi_handler.Init.CRCCalculation = SPI_CRCCALCULATION_ENABLE;
spi_handler.Init.CRCPolynomial = 6;
HAL_SPI_Init(&spi_handler);
}
void hw_spi_communination()
{
// Start full duplex communication process.
HAL_SPI_Receive_DMA(&spi_handler, (U8*)spi_convert_value, 5);
}
void DMA1_Stream3_IRQHandler(void)
{
HAL_DMA_IRQHandler(spi_handler.hdmarx);
}
void SPI2_IRQHandler(void)
{
HAL_SPI_IRQHandler(&spi_handler);
}
/*****************************************************************************/
/*****************************************************************************/
void HAL_SPI_RxCpltCallback(SPI_HandleTypeDef *hspi)
{
hw_spi_result();
}
