CAN BUS Receiving (Using by HAL_CAN_GetRxMessage command)

[UUrcan]

I can send CAN BUS TX Messages to a reader and I can see my data very well.

But I can not get (receive) data from another CAN BUS Unit. (Doesn't read data)

I do not know what is wrong with my code?

Could you please help me about it?

Thank you.

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  */
/* USER CODE END Header */
 
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "can.h"
#include "gpio.h"
 
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "LCD.h"
#include "string.h"
#include "stdio.h"
/* USER CODE END Includes */
 
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
 
/* USER CODE END PTD */
 
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
 
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
 
/* USER CODE END PM */
 
/* Private variables ---------------------------------------------------------*/
 
/* USER CODE BEGIN PV */
char line1[32],line2[32];
 
int i=0;
 
uint8_t RxData[8];
uint8_t ubKeyNumber;
 
CAN_FilterTypeDef  sFilterConfig;
CAN_TxHeaderTypeDef   TxHeader;
CAN_RxHeaderTypeDef   RxHeader;
uint32_t              TxMailbox;
/* USER CODE END PV */
 
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
 
/* USER CODE END PFP */
 
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
 
/* 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_CAN_Init();
  /* USER CODE BEGIN 2 */
  lcd_init(_LCD_4BIT, _LCD_FONT_5x8, _LCD_2LINE);
 
    	lcd_print(1,1,"Receiving Text"); // 1. Satir 1. Sutun'dan itibaren yaz!
    	lcd_print(2,1,"test");		// 2. Satir 1. Sutun'dan itibaren yaz!
    	HAL_Delay(1000);
    	lcd_clear();
 
    	// YOU MUST SET 16th bit of MCR Register to 0 for making it work in debug mode!!! I did it manually. So if you use it don't mess with TIMING QUANTAS
    	    hcan.Instance->MCR = 0x60;
    	      //IMPORTANT FOR DEBUG!!!!!!!
 
    	      //uint8_t Data[8] ;
    	       TxHeader.DLC=8;
    	       TxHeader.IDE=CAN_ID_STD;
    	       TxHeader.RTR=CAN_RTR_DATA;
    	       TxHeader.StdId=135;
    	       TxHeader.ExtId=127;
    	       TxHeader.TransmitGlobalTime = DISABLE;
 
    	      /*sFilterConfig.FilterFIFOAssignment=CAN_FILTER_FIFO0; //set fifo assignment
    	       	sFilterConfig.FilterIdHigh=0x245<<5; //the ID that the filter looks for (switch this for the other microcontroller)
    	       	sFilterConfig.FilterIdLow=0;
    	       	sFilterConfig.FilterMaskIdHigh=0;
    	       	sFilterConfig.FilterMaskIdLow=0;
    	       	sFilterConfig.FilterScale=CAN_FILTERSCALE_32BIT; //set filter scale
    	       	sFilterConfig.FilterActivation=ENABLE; */
 
    	       HAL_CAN_IRQHandler(&hcan);
 
   	       HAL_CAN_ConfigFilter(&hcan,&sFilterConfig);
    	   HAL_CAN_Start(&hcan);
   	       HAL_CAN_ActivateNotification(&hcan,CAN_IT_RX_FIFO0_MSG_PENDING);
 
    	       HAL_Delay(500);
  /* USER CODE END 2 */
 
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */
 
    /* USER CODE BEGIN 3 */
 
	   HAL_CAN_GetRxMessage(&hcan, CAN_RX_FIFO0, &RxHeader, RxData);
 
	  	  char RH[8];
	  	 char yaz[8];
	  	 	  sprintf (RH,"%d",RxHeader.StdId);
	  	 	  sprintf (yaz,"%d",RxData[0]);
	  	 	  	  lcd_print(1,1, RH);
	  	 	  	  lcd_print(2,1, yaz);
 
	  	  HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_13);
	  	  	  	  HAL_Delay(500);
	    //}
  }
  /* 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 CPU, AHB and APB busses clocks 
  */
  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 busses 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();
  }
}
 
/* 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 */
 
  /* 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,
     tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
 
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

[SKacp.1]

Hi,

Please see this topic https://community.st.com/s/question/0D53W00000BJJSJSA5/the-problem-in-can-receive-using-interrupt-as-code-hangs-in-halcanrxfifo0msgpendingcallback-function-in-stm32f103c8t6

[UUrcan]

@SKacp.1​ thanks for your reply. I tried many configs but I still couldn't solve it.

Regards

UUrcan

[UUrcan]

@SKacp.1​ Thanks again. It worked.