SPI Transmit in DMA circular mode not call Tx_complete_callback?

[parth kothiya]

i want to interface shift register(74HC595) with STM32F103C8T6 MCU using SPI Transmit only master mode.

I need to continuously write shift register so it is continuously update op pins. so i set SPI DMA in circular mode and when transmit complete i need to give latch clock so i use HAL_SPI_TxCpltCallback() function but it is only call once when HAL_SPI_Transmit_DMA() call.

how can call HAL_SPI_TxCpltCallback() repetitively DMA circular mode?

my goal is to continuously update SHIFTREISTERs pins using DMA outside while loop.

/* USER CODE BEGIN Header */
/**
 ******************************************************************************
 * @file           : main.c
 * @brief          : Main program body
 ******************************************************************************
 * @attention
 *
 * Copyright (c) 2022 STMicroelectronics.
 * All rights reserved.
 *
 * This software is licensed under terms that can be found in the LICENSE file
 * in the root directory of this software component.
 * If no LICENSE file comes with this software, it is provided AS-IS.
 *
 ******************************************************************************
 */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "dma.h"
#include "spi.h"
#include "gpio.h"
 
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "stdbool.h"
/* USER CODE END Includes */
 
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
 
/* USER CODE END PTD */
 
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#define NO_OF_OP 8
/* USER CODE END PD */
 
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
 
/* USER CODE END PM */
 
/* Private variables ---------------------------------------------------------*/
 
/* USER CODE BEGIN PV */
bool OP[NO_OF_OP];
uint8_t data = 0;
/* USER CODE END PV */
 
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
void HAL_SPI_TxCpltCallback(SPI_HandleTypeDef *hspi)
{
	HAL_GPIO_WritePin(L_CLK_GPIO_Port, L_CLK_Pin, GPIO_PIN_SET);
	HAL_GPIO_WritePin(L_CLK_GPIO_Port, L_CLK_Pin, GPIO_PIN_RESET);
}
void write_to_reg(){
	HAL_GPIO_WritePin(LATCH_CLOCK_GPIO_Port,LATCH_CLOCK_Pin,GPIO_PIN_RESET);
	for (int x = NO_OF_OP-1; x >= 0; x--) {
		HAL_GPIO_WritePin(A_GPIO_Port,A_Pin,OP[x]);
		//delay_us(10);
		HAL_GPIO_WritePin(SHIFT_CLK_GPIO_Port,SHIFT_CLK_Pin,GPIO_PIN_RESET);
		//delay_us(50);
		HAL_GPIO_WritePin(SHIFT_CLK_GPIO_Port,SHIFT_CLK_Pin,GPIO_PIN_SET);
	}
	HAL_GPIO_WritePin(LATCH_CLOCK_GPIO_Port,LATCH_CLOCK_Pin,GPIO_PIN_SET);
	//delay_us(100);
	HAL_GPIO_WritePin(LATCH_CLOCK_GPIO_Port,LATCH_CLOCK_Pin,GPIO_PIN_RESET);
}
/* USER CODE END PFP */
 
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
uint8_t bit_to_byte(bool *bitarray){
	uint8_t byt = 0x00;
	for (uint8_t j = 0; j < 8; ++j) {
		if (bitarray[j]) {
			byt = byt | (1<<j);
		}
	}
	return byt;
}
/* USER CODE END 0 */
 
/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{
  /* USER CODE BEGIN 1 */
 
  /* USER CODE END 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 SysInit */
 
  /* USER CODE END SysInit */
 
  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_DMA_Init();
  MX_SPI1_Init();
  /* USER CODE BEGIN 2 */
	HAL_GPIO_WritePin(OE_GPIO_Port,OE_Pin,GPIO_PIN_RESET);
	HAL_GPIO_WritePin(ENABLE_GPIO_Port, ENABLE_Pin, GPIO_PIN_RESET);
	HAL_SPI_Transmit_DMA(&hspi1, &data, 1);
  /* USER CODE END 2 */
 
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
	while (1)
	{
    /* USER CODE END WHILE */
 
    /* USER CODE BEGIN 3 */
		OP[0] = true;
		OP[1] = true;
		OP[2] = true;
		OP[3] = true;
		OP[4] = false;
		OP[5] = false;
		OP[6] = false;
		OP[7] = false;
		data = bit_to_byte(OP);
 
		/**
		HAL_SPI_Transmit_DMA(&hspi1,&data,1);
		HAL_GPIO_WritePin(L_CLK_GPIO_Port, L_CLK_Pin, GPIO_PIN_SET);
		HAL_GPIO_WritePin(L_CLK_GPIO_Port, L_CLK_Pin, GPIO_PIN_RESET);
		 **/
		HAL_Delay(100);
 
		OP[0] = false;
		OP[1] = false;
		OP[2] = false;
		OP[3] = false;
		OP[4] = true;
		OP[5] = true;
		OP[6] = true;
		OP[7] = true;
		data = bit_to_byte(OP);
 
		/**
		HAL_SPI_Transmit_DMA(&hspi1,&data,1);
		HAL_GPIO_WritePin(L_CLK_GPIO_Port, L_CLK_Pin, GPIO_PIN_SET);
		HAL_GPIO_WritePin(L_CLK_GPIO_Port, L_CLK_Pin, GPIO_PIN_RESET);
		 **/
		HAL_Delay(100);
	}
  /* USER CODE END 3 */
}
 
/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
 
  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
 
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
  {
    Error_Handler();
  }
  /** Enables the Clock Security System
  */
  HAL_RCC_EnableCSS();
}
 
/* USER CODE BEGIN 4 */
 
/* USER CODE END 4 */
 
/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
	/* User can add his own implementation to report the HAL error return state */
	__disable_irq();
	while (1)
	{
	}
  /* USER CODE END Error_Handler_Debug */
}
 
#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
  /* USER CODE BEGIN 6 */
	/* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
 

void MX_SPI1_Init(void)
{
 
  /* USER CODE BEGIN SPI1_Init 0 */
 
  /* USER CODE END SPI1_Init 0 */
 
  /* USER CODE BEGIN SPI1_Init 1 */
 
  /* USER CODE END SPI1_Init 1 */
  hspi1.Instance = SPI1;
  hspi1.Init.Mode = SPI_MODE_MASTER;
  hspi1.Init.Direction = SPI_DIRECTION_2LINES;
  hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
  hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
  hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
  hspi1.Init.NSS = SPI_NSS_SOFT;
  hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_4;
  hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi1.Init.CRCPolynomial = 10;
  if (HAL_SPI_Init(&hspi1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN SPI1_Init 2 */
 
  /* USER CODE END SPI1_Init 2 */
 
}
 
void HAL_SPI_MspInit(SPI_HandleTypeDef* spiHandle)
{
 
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(spiHandle->Instance==SPI1)
  {
  /* USER CODE BEGIN SPI1_MspInit 0 */
 
  /* USER CODE END SPI1_MspInit 0 */
    /* SPI1 clock enable */
    __HAL_RCC_SPI1_CLK_ENABLE();
 
    __HAL_RCC_GPIOA_CLK_ENABLE();
    /**SPI1 GPIO Configuration
    PA5     ------> SPI1_SCK
    PA7     ------> SPI1_MOSI
    */
    GPIO_InitStruct.Pin = GPIO_PIN_5|GPIO_PIN_7;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
    /* SPI1 DMA Init */
    /* SPI1_TX Init */
    hdma_spi1_tx.Instance = DMA1_Channel3;
    hdma_spi1_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;
    hdma_spi1_tx.Init.PeriphInc = DMA_PINC_DISABLE;
    hdma_spi1_tx.Init.MemInc = DMA_MINC_ENABLE;
    hdma_spi1_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
    hdma_spi1_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
    hdma_spi1_tx.Init.Mode = DMA_NORMAL;
    hdma_spi1_tx.Init.Priority = DMA_PRIORITY_MEDIUM;
    if (HAL_DMA_Init(&hdma_spi1_tx) != HAL_OK)
    {
      Error_Handler();
    }
 
    __HAL_LINKDMA(spiHandle,hdmatx,hdma_spi1_tx);
 
  /* USER CODE BEGIN SPI1_MspInit 1 */
 
  /* USER CODE END SPI1_MspInit 1 */
  }
}

[TDK · Accepted solution]

> hdma_spi1_tx.Init.Mode = DMA_NORMAL;

This is a one shot transfer.

You need DMA_CIRCULAR for circular transfers.

[parth kothiya]

Dma set in circular mode then I call

HAL_SPI_Transmit_DMA(&hspi1, &data, 1);

Once it continuously call spi TX comp callback?​

[TDK]

That's how circular DMA works, yes.

Calling circular DMA on a single byte makes no real sense if you're interested in the completion callback. Unlikely the code will keep up at any reasonable data rate.

[parth kothiya]

After data send to shift register using spi I need to give latch clock pulse for load data so I use txcompletecallback.

Is there any other batter way to do this for shift register 74HC595?​