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I cannot receive from PCAN Viewer from my board

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kyruss_21
Associate II

‎2026-02-17 2:12 AM - last edited on ‎2026-02-17 2:40 AM by

I'm trying to establish communication with FDCAN and view the signal via PCan View, but nothing appears on the screen. There are no errors in the connections. These are the codes:

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2026 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 */
#include <math.h>
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
uint32_t ADC[3];
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

ADC_HandleTypeDef hadc1;
DMA_HandleTypeDef hdma_adc1;

FDCAN_HandleTypeDef hfdcan1;

/* USER CODE BEGIN PV */
uint8_t temp1;
uint8_t temp2;
uint8_t temp3;
uint8_t tx_buffer[8];
//uint8_t tx_buffer[8] = {1,2,3,4,5,6,7,8};
FDCAN_TxHeaderTypeDef TxTransmitter; // TxTransmitter Structure'ı

uint32_t TxMailbox;




/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_ADC1_Init(void);
static void MX_FDCAN1_Init(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

double Thermistor(int analogValue){

 if(analogValue != 0)
 {
	 double temperature;
	 temperature = log(((40950000 / analogValue) - 10000));// 4095 ADC çözünürlüğü(12 bit)
	 temperature = 1 / (0.001129148 + (0.000234125 + (0.0000000876741 * temperature * temperature)) * temperature);
	 temperature = temperature - 273.15;
	 return temperature;
 }
}

/* 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_ADC1_Init();
  MX_FDCAN1_Init();
  /* USER CODE BEGIN 2 */
  HAL_ADC_Start_DMA(&hadc1, &ADC, 3);

  HAL_FDCAN_Start(&hfdcan1);

  TxTransmitter.Identifier = 0x37;
  TxTransmitter.IdType = FDCAN_STANDARD_ID;
  TxTransmitter.TxFrameType = FDCAN_DATA_FRAME;
  TxTransmitter.DataLength = FDCAN_DLC_BYTES_8;
  TxTransmitter.ErrorStateIndicator = FDCAN_ESI_ACTIVE;
  TxTransmitter.BitRateSwitch = FDCAN_BRS_OFF;
  TxTransmitter.FDFormat = FDCAN_CLASSIC_CAN;
  TxTransmitter.TxEventFifoControl = FDCAN_NO_TX_EVENTS;
  TxTransmitter.MessageMarker = 0;

  /* USER CODE END 2 */

  /* Initialize USER push-button, will be used to trigger an interrupt each time it's pressed.*/
  BSP_PB_Init(BUTTON_USER, BUTTON_MODE_EXTI);

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {

    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */

	    temp1 = (uint8_t)Thermistor(ADC[0]);
	    temp2 = (uint8_t)Thermistor(ADC[1]);
	    temp3 = (uint8_t)Thermistor(ADC[2]);

	    tx_buffer[0]= temp1;
	    tx_buffer[1]= temp2;
	    tx_buffer[2]= temp3;
	    tx_buffer[3] = 0;
	    tx_buffer[4] = 0;
	    tx_buffer[5] = 0;
	    tx_buffer[6] = 0;
	    tx_buffer[7] = 0;

	    HAL_FDCAN_AddMessageToTxFifoQ(&hfdcan1, &TxTransmitter, tx_buffer);

  }
  /* 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_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1_BOOST);

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV4;
  RCC_OscInitStruct.PLL.PLLN = 85;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
  RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
  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_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
  {
    Error_Handler();
  }
}

/**
  * @brief ADC1 Initialization Function
  *  None
  * @retval None
  */
static void MX_ADC1_Init(void)
{

  /* USER CODE BEGIN ADC1_Init 0 */

  /* USER CODE END ADC1_Init 0 */

  ADC_MultiModeTypeDef multimode = {0};
  ADC_ChannelConfTypeDef sConfig = {0};

  /* USER CODE BEGIN ADC1_Init 1 */

  /* USER CODE END ADC1_Init 1 */

  /** Common config
  */
  hadc1.Instance = ADC1;
  hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
  hadc1.Init.Resolution = ADC_RESOLUTION_12B;
  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc1.Init.GainCompensation = 0;
  hadc1.Init.ScanConvMode = ADC_SCAN_ENABLE;
  hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
  hadc1.Init.LowPowerAutoWait = DISABLE;
  hadc1.Init.ContinuousConvMode = ENABLE;
  hadc1.Init.NbrOfConversion = 3;
  hadc1.Init.DiscontinuousConvMode = DISABLE;
  hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
  hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
  hadc1.Init.DMAContinuousRequests = ENABLE;
  hadc1.Init.Overrun = ADC_OVR_DATA_PRESERVED;
  hadc1.Init.OversamplingMode = DISABLE;
  if (HAL_ADC_Init(&hadc1) != HAL_OK)
  {
    Error_Handler();
  }

  /** Configure the ADC multi-mode
  */
  multimode.Mode = ADC_MODE_INDEPENDENT;
  if (HAL_ADCEx_MultiModeConfigChannel(&hadc1, &multimode) != HAL_OK)
  {
    Error_Handler();
  }

  /** Configure Regular Channel
  */
  sConfig.Channel = ADC_CHANNEL_1;
  sConfig.Rank = ADC_REGULAR_RANK_1;
  sConfig.SamplingTime = ADC_SAMPLETIME_92CYCLES_5;
  sConfig.SingleDiff = ADC_SINGLE_ENDED;
  sConfig.OffsetNumber = ADC_OFFSET_NONE;
  sConfig.Offset = 0;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
    Error_Handler();
  }

  /** Configure Regular Channel
  */
  sConfig.Channel = ADC_CHANNEL_2;
  sConfig.Rank = ADC_REGULAR_RANK_2;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
    Error_Handler();
  }

  /** Configure Regular Channel
  */
  sConfig.Channel = ADC_CHANNEL_9;
  sConfig.Rank = ADC_REGULAR_RANK_3;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN ADC1_Init 2 */

  /* USER CODE END ADC1_Init 2 */

}

/**
  * @brief FDCAN1 Initialization Function
  *  None
  * @retval None
  */
static void MX_FDCAN1_Init(void)
{

  /* USER CODE BEGIN FDCAN1_Init 0 */

  /* USER CODE END FDCAN1_Init 0 */

  /* USER CODE BEGIN FDCAN1_Init 1 */

  /* USER CODE END FDCAN1_Init 1 */
  hfdcan1.Instance = FDCAN1;
  hfdcan1.Init.ClockDivider = FDCAN_CLOCK_DIV1;
  hfdcan1.Init.FrameFormat = FDCAN_FRAME_FD_NO_BRS;
  hfdcan1.Init.Mode = FDCAN_MODE_NORMAL;
  hfdcan1.Init.AutoRetransmission = ENABLE;
  hfdcan1.Init.TransmitPause = DISABLE;
  hfdcan1.Init.ProtocolException = DISABLE;
  hfdcan1.Init.NominalPrescaler = 68;
  hfdcan1.Init.NominalSyncJumpWidth = 13;
  hfdcan1.Init.NominalTimeSeg1 = 8;
  hfdcan1.Init.NominalTimeSeg2 = 1;
  hfdcan1.Init.DataPrescaler = 25;
  hfdcan1.Init.DataSyncJumpWidth = 1;
  hfdcan1.Init.DataTimeSeg1 = 1;
  hfdcan1.Init.DataTimeSeg2 = 1;
  hfdcan1.Init.StdFiltersNbr = 0;
  hfdcan1.Init.ExtFiltersNbr = 0;
  hfdcan1.Init.TxFifoQueueMode = FDCAN_TX_FIFO_OPERATION;
  if (HAL_FDCAN_Init(&hfdcan1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN FDCAN1_Init 2 */

  /* USER CODE END FDCAN1_Init 2 */

}

/**
  * Enable DMA controller clock
  */
static void MX_DMA_Init(void)
{

  /* DMA controller clock enable */
  __HAL_RCC_DMAMUX1_CLK_ENABLE();
  __HAL_RCC_DMA1_CLK_ENABLE();

  /* DMA interrupt init */
  /* DMA1_Channel1_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);

}

/**
  * @brief GPIO Initialization Function
  *  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_GPIOF_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();

  /*Configure GPIO pins : PA2 PA3 */
  GPIO_InitStruct.Pin = GPIO_PIN_2|GPIO_PIN_3;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF12_LPUART1;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /* USER CODE BEGIN MX_GPIO_Init_2 */

  /* USER CODE END MX_GPIO_Init_2 */
}

/* 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.
  *   file: pointer to the source file name
  *   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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1 ACCEPTED SOLUTION

Accepted Solutions
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kyruss_21
Associate II

‎2026-02-17 3:20 AM

I've solved the problem by grounding the STB and SHDN pins of the TCAN3413, I was able to restore communication. 

View solution in original post

7 REPLIES 7
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Andrew Neil
Super User

‎2026-02-17 2:33 AM

Welcome to the forum.

Please give more details of your setup - see: How to write your question to maximize your chances to find a solution

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.
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Kraal
Lead

‎2026-02-17 2:36 AM

Is it really all the user code ? The pins used for the CAN communication don't seem to be initialized.

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mƎALLEm
ST Employee

‎2026-02-17 2:56 AM

Hello @kyruss_21 and welcome to the ST community,

Some info are missing:

1- You didn't provide the MCU part number you are using.

2- For CAN related questions you need to provide details about your hardware: the schematics especially the CAN part: the transceiver, the terminating resistors etc ..

3- Need to share you ioc file.

4- Avoid using HSI for the CAN communication:

RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;

Please use HSE with a crystal (XTAL or XO) or another precise clock source.

5- Avoid setting TSEG1/TSEG2 with 1xTq. You set a prescaler at 68 with low TSEGx values.

  hfdcan1.Init.NominalPrescaler = 68;
  hfdcan1.Init.NominalTimeSeg1 = 8;
  hfdcan1.Init.NominalTimeSeg2 = 1;

You need to do the inverse: decrease as much as possible the prescaler and increase as much as possible TSEG1 and TSEG2 with a sample point set at 87.5%. Please read this article. It refers to bxCAN but the theory applies to FDCAN in classic mode: CAN (bxCAN) bit time configuration on STM32 MCUs

6- Did you insure you set the same CAN bitrate for all CAN nodes?

7- Seems you are using classic CAN frames so please sue Classic mode: 

hfdcan1.Init.FrameFormat = FDCAN_FRAME_CLASSIC;

8- Ensure you set the correct parameters in your PCAN analyzer.

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.
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mƎALLEm
ST Employee
In response to Kraal

‎2026-02-17 2:59 AM

The pins are initialized in the xxx_msp.c file.

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.
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kyruss_21
Associate II

‎2026-02-17 3:20 AM

I've solved the problem by grounding the STB and SHDN pins of the TCAN3413, I was able to restore communication. 

Go to solution
kyruss_21
Associate II
In response to mƎALLEm

‎2026-02-17 3:22 AM

That is also helped alot. Thank you!

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mƎALLEm
ST Employee
In response to kyruss_21

‎2026-02-17 3:32 AM

@kyruss_21 wrote:

I've solved the problem by grounding the STB and SHDN pins of the TCAN3413, I was able to restore communication. 

That's why it's recommended to share also the schematics and info about the hardware in the CAN/FDCAN related questions.

And glad to hear you solved your issue :).

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.
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