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Issue in CAN commnuication with STM32466RE

Pushpanjali_Jha
Associate

I am currently working on a project involving two STM32F446RE microcontrollers, each connected to a CJMCU-2551 MCP2551 CAN Protocol Controller High-speed Interface Module. The setup is intended to facilitate CAN communication between the two microcontrollers.

Problem:

  • The STM32F446RE configured as the transmitter is successfully sending data.
  • However, the second STM32F446RE, intended to receive the data, is not receiving any communication.
  • Additionally, I have observed that the MCP2551 module connected to the transmitting STM32F446RE is showing equal voltage levels on both the CANH and CANL pins.

Request for Assistance:

  • Could this issue be related to the CAN bus itself, or might it be a problem with the software configuration?
  • What steps can I take to diagnose and resolve this issue?

Any insights or suggestions would be greatly appreciated.

2 REPLIES 2
Techn
Senior III

Best is to connect a known working device such as arduino which receives all transmitted frames. If the receiver do not acknowledge,  the transmitter will stop.

If you feel a post has answered your question, please click "Accept as Solution".

in my case , I have 2 stm32F446RE One is transmitter and another is receiver and reciever don't receive anything inspite of transmitting correctly..can you give me according to this scenario any solution.

 

/* USER CODE BEGIN Header */ /** ****************************************************************************** * @file : main.c * @brief : Main program body ****************************************************************************** * @attention * * Copyright (c) 2024 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" /* 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 hcan2; /* USER CODE BEGIN PV */ CAN_RxHeaderTypeDef rxHeader; //CAN Bus Transmit Header CAN_FilterTypeDef canfilterconfig; uint8_t canRX; uint32_t C=0; /* USER CODE END PV */ /* Private function prototypes -----------------------------------------------*/ void SystemClock_Config(void); static void MX_GPIO_Init(void); static void MX_CAN2_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. */ 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_CAN2_Init(); /* USER CODE BEGIN 2 */ HAL_CAN_ConfigFilter(&hcan2,&canfilterconfig); //Initialize CAN Filter HAL_CAN_Start(&hcan2); //Initialize CAN Bus HAL_CAN_ActivateNotification(&hcan2,CAN_IT_RX_FIFO1_MSG_PENDING);// Initialize CAN Bus Rx Interrupt /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { /* USER CODE END WHILE */ /* 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}; /** Configure the main internal regulator output voltage */ __HAL_RCC_PWR_CLK_ENABLE(); __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3); /** 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.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; RCC_OscInitStruct.PLL.PLLM = 4; RCC_OscInitStruct.PLL.PLLN = 72; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; RCC_OscInitStruct.PLL.PLLQ = 2; RCC_OscInitStruct.PLL.PLLR = 2; 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(); } } /** * @brief CAN2 Initialization Function * @PAram None * @retval None */ static void MX_CAN2_Init(void) { /* USER CODE BEGIN CAN2_Init 0 */ /* USER CODE END CAN2_Init 0 */ /* USER CODE BEGIN CAN2_Init 1 */ /* USER CODE END CAN2_Init 1 */ hcan2.Instance = CAN2; hcan2.Init.Prescaler = 72; hcan2.Init.Mode = CAN_MODE_NORMAL; hcan2.Init.SyncJumpWidth = CAN_SJW_1TQ; hcan2.Init.TimeSeg1 = CAN_BS1_1TQ; hcan2.Init.TimeSeg2 = CAN_BS2_2TQ; hcan2.Init.TimeTriggeredMode = DISABLE; hcan2.Init.AutoBusOff = DISABLE; hcan2.Init.AutoWakeUp = DISABLE; hcan2.Init.AutoRetransmission = DISABLE; hcan2.Init.ReceiveFifoLocked = DISABLE; hcan2.Init.TransmitFifoPriority = DISABLE; if (HAL_CAN_Init(&hcan2) != HAL_OK) { Error_Handler(); } /* USER CODE BEGIN CAN2_Init 2 */ canfilterconfig.FilterActivation = CAN_FILTER_ENABLE; canfilterconfig.FilterBank = 18; // which filter bank to use from the assigned ones canfilterconfig.FilterFIFOAssignment = CAN_FILTER_FIFO1; canfilterconfig.FilterIdHigh = 0x446<<5; canfilterconfig.FilterIdLow = 0; canfilterconfig.FilterMaskIdHigh = 0x446<<5; canfilterconfig.FilterMaskIdLow = 0x0000; canfilterconfig.FilterMode = CAN_FILTERMODE_IDMASK; canfilterconfig.FilterScale = CAN_FILTERSCALE_32BIT; canfilterconfig.SlaveStartFilterBank = 20; // how many filters to assign to the CAN1 (master can) /* USER CODE END CAN2_Init 2 */ } /** * @brief GPIO Initialization Function * @PAram None * @retval None */ static void MX_GPIO_Init(void) { GPIO_InitTypeDef GPIO_InitStruct = {0}; /* USER CODE BEGIN MX_GPIO_Init_1 */ /* USER CODE END MX_GPIO_Init_1 */ /* GPIO Ports Clock Enable */ __HAL_RCC_GPIOC_CLK_ENABLE(); __HAL_RCC_GPIOH_CLK_ENABLE(); __HAL_RCC_GPIOA_CLK_ENABLE(); __HAL_RCC_GPIOB_CLK_ENABLE(); /*Configure GPIO pin Output Level */ HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_RESET); /*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 MX_GPIO_Init_2 */ /* USER CODE END MX_GPIO_Init_2 */ } /* USER CODE BEGIN 4 */ void HAL_CAN_RxFifo1MsgPendingCallback(CAN_HandleTypeDef *hcan1) { if(HAL_CAN_GetRxMessage(hcan1, CAN_RX_FIFO1, &rxHeader, &canRX)){ //Receive CAN bus message to canRX buffer HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5,GPIO_PIN_SET);// toggle PA3 LED C++; } } /* 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 */
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this is my reciever code .