Hello, I have been stuck on this issues where I cannot get my SPI slave running on the STM32H755 to successfully do full duplex communication. Right now I want the simplest case to work where the SPI master, also an STM32H755, sends a 16 bit data payload with a 16 bit attached CRC (so 4 byte total SPI frame) on the MOSI line. For simplicity, I am trying to send 0x5555 on the 16 bit data payload on the SPI slave over MISO with the HAL_SPI_TransmitReceive_DMA() function. For now I am ignoring the received data. Right now I have the SPI master successfully sending a dummy 16 bit data at 100 Hz. The problem is that the SPI slave is failing to send anything over MISO. From debugging it seems the issue is with using DMA.
On the first call to HAL_SPI_TransmitReceive_DMA() i go into the SPI error callback and i get HAL_SPI_ERROR_DMA from HAL_SPI_GetError(). On the second call, I get an SPI error code of 0x94 which I'm not sure what the meaning is as it doesnt correspond to any of the SPI_Error_Code error codes in the HAL.
What am I dong wrong?
SPI master code:
#include "main.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "cmsis_gcc.h"
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#ifndef HSEM_ID_0
#define HSEM_ID_0 (0U) /* HW semaphore 0*/
#endif
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
SPI_HandleTypeDef hspi4;
DMA_HandleTypeDef hdma_spi4_tx;
DMA_HandleTypeDef hdma_spi4_rx;
/* USER CODE BEGIN PV */
volatile uint8_t txbuf[64];
volatile uint8_t rxbuf[64];
volatile uint8_t spi_state = 0;
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MPU_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
void HAL_SPI_TxCpltCallback(SPI_HandleTypeDef *hspi) {
spi_state = 1;
}
void HAL_SPI_TxRxCpltCallback(SPI_HandleTypeDef *hspi) {
spi_state = 1;
}
void HAL_SPI_ErrorCallback(SPI_HandleTypeDef *hspi) {
spi_state = 2;
}
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* USER CODE BEGIN Boot_Mode_Sequence_0 */
int32_t timeout;
/* USER CODE END Boot_Mode_Sequence_0 */
/* MPU Configuration--------------------------------------------------------*/
MPU_Config();
/* USER CODE BEGIN Boot_Mode_Sequence_1 */
/* Wait until CPU2 boots and enters in stop mode or timeout*/
timeout = 0xFFFF;
while((__HAL_RCC_GET_FLAG(RCC_FLAG_D2CKRDY) != RESET) && (timeout-- > 0));
if ( timeout < 0 )
{
Error_Handler();
}
/* USER CODE END Boot_Mode_Sequence_1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN Boot_Mode_Sequence_2 */
/* When system initialization is finished, Cortex-M7 will release Cortex-M4 by means of
HSEM notification */
/*HW semaphore Clock enable*/
__HAL_RCC_HSEM_CLK_ENABLE();
/*Take HSEM */
HAL_HSEM_FastTake(HSEM_ID_0);
/*Release HSEM in order to notify the CPU2(CM4)*/
HAL_HSEM_Release(HSEM_ID_0,0);
/* wait until CPU2 wakes up from stop mode */
timeout = 0xFFFF;
while((__HAL_RCC_GET_FLAG(RCC_FLAG_D2CKRDY) == RESET) && (timeout-- > 0));
if ( timeout < 0 )
{
Error_Handler();
}
/* USER CODE END Boot_Mode_Sequence_2 */
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_SPI4_Init();
/* USER CODE BEGIN 2 */
__HAL_DBGMCU_FREEZE_IWDG1();
__enable_irq();
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
txbuf[0] = 0x15;
txbuf[1] = 0xab;
HAL_StatusTypeDef res;
while (1)
{
spi_state = 0;
HAL_GPIO_WritePin(SPI4_SS_GPIO_Port, SPI4_SS_Pin, 0);
HAL_SPI_TransmitReceive(&hspi4, txbuf, rxbuf, 1, 100);
HAL_GPIO_WritePin(SPI4_SS_GPIO_Port, SPI4_SS_Pin, 1);
HAL_Delay(100);
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}SPI slave code:
#include "main.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
typedef enum {
TRANSFER_COMPLETE,
TRANSFER_WAIT,
TRANSFER_ERROR,
} Transfer_e;
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#ifndef HSEM_ID_0
#define HSEM_ID_0 (0U) /* HW semaphore 0*/
#endif
#define BUF_SIZE (64)
#define PACKET_SIZE (50)
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
SPI_HandleTypeDef hspi4;
DMA_HandleTypeDef hdma_spi4_rx;
DMA_HandleTypeDef hdma_spi4_tx;
/* USER CODE BEGIN PV */
volatile Transfer_e wTransferState = TRANSFER_COMPLETE;
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MPU_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
void HAL_SPI_TxCpltCallback(SPI_HandleTypeDef *hspi) {
wTransferState = TRANSFER_COMPLETE;
}
void HAL_SPI_TxRxCpltCallback(SPI_HandleTypeDef *hspi) {
wTransferState = TRANSFER_COMPLETE;
}
void HAL_SPI_RxCpltCallback(SPI_HandleTypeDef *hspi) {
wTransferState = TRANSFER_COMPLETE;
}
void HAL_SPI_ErrorCallback(SPI_HandleTypeDef *hspi) {
wTransferState = TRANSFER_ERROR;
}
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* USER CODE BEGIN Boot_Mode_Sequence_0 */
int32_t timeout;
/* USER CODE END Boot_Mode_Sequence_0 */
/* MPU Configuration--------------------------------------------------------*/
MPU_Config();
/* USER CODE BEGIN Boot_Mode_Sequence_1 */
/* Wait until CPU2 boots and enters in stop mode or timeout*/
timeout = 0xFFFF;
while((__HAL_RCC_GET_FLAG(RCC_FLAG_D2CKRDY) != RESET) && (timeout-- > 0));
if ( timeout < 0 )
{
Error_Handler();
}
/* USER CODE END Boot_Mode_Sequence_1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN Boot_Mode_Sequence_2 */
/* When system initialization is finished, Cortex-M7 will release Cortex-M4 by means of
HSEM notification */
/*HW semaphore Clock enable*/
__HAL_RCC_HSEM_CLK_ENABLE();
/*Take HSEM */
HAL_HSEM_FastTake(HSEM_ID_0);
/*Release HSEM in order to notify the CPU2(CM4)*/
HAL_HSEM_Release(HSEM_ID_0,0);
/* wait until CPU2 wakes up from stop mode */
timeout = 0xFFFF;
while((__HAL_RCC_GET_FLAG(RCC_FLAG_D2CKRDY) == RESET) && (timeout-- > 0));
if ( timeout < 0 )
{
Error_Handler();
}
/* USER CODE END Boot_Mode_Sequence_2 */
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_SPI4_Init();
/* USER CODE BEGIN 2 */
volatile uint16_t ptxBuf[4];
volatile uint16_t prxBuf[4];
__enable_irq();
ptxBuf[0] = 0x5555;
HAL_StatusTypeDef res;
uint16_t size = 1;
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
if (HAL_GPIO_ReadPin(SPI4_NSS_GPIO_Port, SPI4_NSS_Pin) == GPIO_PIN_RESET) {
res = HAL_SPI_TransmitReceive_DMA(&hspi4, (uint8_t *)ptxBuf, (uint8_t *)prxBuf, size);
}
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
I attached an image of the SPI bus currently, as you can see the SPI master is successfully sending the dummy data payload of 0xAB15 but the SPI slave is failing to send anything on MISO.
