STM32f103c8t6 can protocol

[Hassan2002]

I am configuring can and sending data to other stm32f103c8 but when I connect the can H and can L on the channels of oscilloscope I don't get any signal. What could be the problem?,i used mcp2551 transceiver

code for transmitting data :

/* USER CODE BEGIN Header */

/**

  ******************************************************************************

  * @file           : main.c

  * @brief          : Main program body

  ******************************************************************************

  * @attention

  *

  * <h2><center>&copy; Copyright (c) 2023 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"

/* Private includes ----------------------------------------------------------*/

/* USER CODE BEGIN Includes */

/* 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 ---------------------------------------------------------*/

CAN_HandleTypeDef hcan;

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/

void SystemClock_Config(void);

static void MX_GPIO_Init(void);

static void MX_CAN_Init(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. */

  /* 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();

  if(HAL_CAN_Start(&hcan)!=HAL_OK)

  {

  Error_Handler();

  }

  /* USER CODE BEGIN 2 */

  /* USER CODE END 2 */

  /* Infinite loop */

  /* USER CODE BEGIN WHILE */

  while (1)

  {

    /* USER CODE END WHILE */

can1_tx();

    /*HAL_dela

  HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_5);

  HAL_Delay(1000);

*/

    /* USER CODE BEGIN 3 */

  }

  /* 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();

  }

}

/**

  * @brief CAN Initialization Function

  * @PAram None

  * @retval None

  */

static void MX_CAN_Init(void)

{

  /* USER CODE BEGIN CAN_Init 0 */

  /* USER CODE END CAN_Init 0 */

  /* USER CODE BEGIN CAN_Init 1 */

  /* USER CODE END CAN_Init 1 */

  hcan.Instance = CAN1;

  hcan.Init.Prescaler = 16;

  hcan.Init.Mode = CAN_MODE_NORMAL;

  hcan.Init.SyncJumpWidth = CAN_SJW_1TQ;

  hcan.Init.TimeSeg1 = CAN_BS1_1TQ;

  hcan.Init.TimeSeg2 = CAN_BS2_1TQ;

  hcan.Init.TimeTriggeredMode = DISABLE;

  hcan.Init.AutoBusOff = DISABLE;

  hcan.Init.AutoWakeUp = DISABLE;

  hcan.Init.AutoRetransmission = DISABLE;

  hcan.Init.ReceiveFifoLocked = DISABLE;

  hcan.Init.TransmitFifoPriority = DISABLE;

  if (HAL_CAN_Init(&hcan) != HAL_OK)

  {

    Error_Handler();

  }

  /* USER CODE BEGIN CAN_Init 2 */

  /* USER CODE END CAN_Init 2 */

}

/**

  * @brief GPIO Initialization Function

  * @PAram None

  * @retval None

  */

void can1_tx()

{

CAN_TxHeaderTypeDef   TxHeader;

    uint32_t TxMailbox;

  uint8_t message[8]={1,2,3,4,5,6,7,8};

TxHeader.IDE = CAN_ID_STD;

    TxHeader.StdId = 0x103;

    TxHeader.RTR = CAN_RTR_DATA;

    TxHeader.DLC = 8;

if(HAL_CAN_AddTxMessage(&hcan, &TxHeader, message, &TxMailbox)!= HAL_OK)

  {

      Error_Handler();

  }

while(HAL_CAN_IsTxMessagePending(&hcan, TxMailbox));

HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_13);

HAL_Delay(3000);

}

static void MX_GPIO_Init(void)

{

  GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* GPIO Ports Clock Enable */

  __HAL_RCC_GPIOC_CLK_ENABLE();

  __HAL_RCC_GPIOD_CLK_ENABLE();

  __HAL_RCC_GPIOA_CLK_ENABLE();

  /*Configure GPIO pin Output Level */

  HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13, GPIO_PIN_RESET);

  /*Configure GPIO pin Output Level */

  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_RESET);

  /*Configure GPIO pin : PC13 */

  GPIO_InitStruct.Pin = GPIO_PIN_13;

  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;

  GPIO_InitStruct.Pull = GPIO_NOPULL;

  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;

  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

  /*Configure GPIO pin : PA5 */

  GPIO_InitStruct.Pin = GPIO_PIN_5;

  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;

  GPIO_InitStruct.Pull = GPIO_NOPULL;

  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;

  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

}

/* 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***/

[KDJEM.1]

Hello @Hassan2002 and welcome to the Community 🙂,

Did you configure the CAN filter?

Note that the filter scale and mode configuration must be configured before entering Normal Mode. This note mentioned in RM0008, section 24.4.2 Normal mode.

I think STM32CubeF1/Projects/STM3210E_EVAL/Examples/CAN/CAN_Networking at master · STMicroelectronics/STM32CubeF1 · GitHub example can help you.

Thank you.

Kaouthar