CAN start API not executing in stm32F446RE board

[Komal]

Hi ST,

Can you please suggest me the solution of my problem, below is the problem statement

I have configured the stm32f446RE oard to use CAN1 in loopback mode, using CAN start in a function but the MSR bit 0 INAK is not resetting in the HAL_CAN_Start API

please find my code in the attachment 
i am use 500kbps baudrate.

Hoping for your quick response.

Note: Tried by increasing the CAN_TIMEOUT_VALUE but the CAN_Sart is not coming out of the while loop

 

/* Wait the acknowledge */
while ((hcan->Instance->MSR & CAN_MSR_INAK) != 0U)
{
/* Check for the Timeout */
if ((HAL_GetTick() - tickstart) > CAN_TIMEOUT_VALUE)

 

Requesting for fast response 

[mƎALLEm]

Hello,

First, please use </> button to paste your code. Read our recommendations on this link: https://community.st.com/t5/community-guidelines/how-to-write-your-question-to-maximize-your-chances-to-find-a/ta-p/575228

Second, did you enable the internal pull-up resistor on CAN-RX pin?

Also see these parameters are bad:

 

 

 hcan1.Init.Prescaler = 6;
 hcan1.Init.TimeSeg1 = CAN_BS1_11TQ;
 hcan1.Init.TimeSeg2 = CAN_BS2_2TQ;

 

 

 See this thread: https://community.st.com/t5/stm32-mcus-products/can1-loopback-does-not-work-on-stm32f427/m-p/695622

[Komal]

please find the code 

/* USER CODE BEGIN Header */
/**
 ******************************************************************************
 * @file : main.c
 * @brief : Main program body
 ******************************************************************************
 * @attention
 *
 * Copyright (c) 2023 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 hcan1;

/* USER CODE BEGIN PV */
 CAN_TxHeaderTypeDef TxHeader;
 CAN_RxHeaderTypeDef RxHeader;
 uint8_t TxData[8];
 uint8_t RxData[8];
 uint32_t TxMailbox;
 uint8_t			 test;
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_CAN1_Init(void);
/* USER CODE BEGIN PFP */
static HAL_StatusTypeDef CAN_Polling(void);
/* 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_CAN1_Init();
 /* USER CODE BEGIN 2 */

 /* USER CODE END 2 */

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

 /* USER CODE BEGIN 3 */
	 if(CAN_Polling() == HAL_OK)
	 {
	 	 test=1;
	 }
	 else
	 {
	 	 test=2;
	 }

 }
 /* 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_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 = 16;
 RCC_OscInitStruct.PLL.PLLN = 336;
 RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
 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 CAN1 Initialization Function
 * @PAram None
 * @retval None
 */
static void MX_CAN1_Init(void)
{

 /* USER CODE BEGIN CAN1_Init 0 */

 /* USER CODE END CAN1_Init 0 */

 /* USER CODE BEGIN CAN1_Init 1 */

 /* USER CODE END CAN1_Init 1 */
 hcan1.Instance = CAN1;
 hcan1.Init.Prescaler = 6;
 hcan1.Init.Mode = CAN_MODE_LOOPBACK;
 hcan1.Init.SyncJumpWidth = CAN_SJW_1TQ;
 hcan1.Init.TimeSeg1 = CAN_BS1_11TQ;
 hcan1.Init.TimeSeg2 = CAN_BS2_2TQ;
 hcan1.Init.TimeTriggeredMode = DISABLE;
 hcan1.Init.AutoBusOff = DISABLE;
 hcan1.Init.AutoWakeUp = DISABLE;
 hcan1.Init.AutoRetransmission = ENABLE;
 hcan1.Init.ReceiveFifoLocked = DISABLE;
 hcan1.Init.TransmitFifoPriority = DISABLE;
 if (HAL_CAN_Init(&hcan1) != HAL_OK)
 {
 Error_Handler();
 }

 /* USER CODE BEGIN CAN1_Init 2 */
 CAN_FilterTypeDef sFilterConfig;

 /*##-2- Configure the CAN Filter ###########################################*/
 sFilterConfig.FilterBank = 0;
 sFilterConfig.FilterMode = CAN_FILTERMODE_IDMASK;
 sFilterConfig.FilterScale = CAN_FILTERSCALE_32BIT;
 sFilterConfig.FilterIdHigh = 0x0000;
 sFilterConfig.FilterIdLow = 0x0000;
 sFilterConfig.FilterMaskIdHigh = 0x0000;
 sFilterConfig.FilterMaskIdLow = 0x0000;
 sFilterConfig.FilterFIFOAssignment = CAN_RX_FIFO0;
 sFilterConfig.FilterActivation = ENABLE;
 sFilterConfig.SlaveStartFilterBank = 14;

 if(HAL_CAN_ConfigFilter(&hcan1, &sFilterConfig) != HAL_OK)
 {
 /* Filter configuration Error */
 Error_Handler();
 }


 /*##-3- Start the CAN peripheral ###########################################*/
 if (HAL_CAN_Start(&hcan1) != HAL_OK)
 {
 /* Start Error */
 Error_Handler();
 }

 /* USER CODE END CAN1_Init 2 */

}

/**
 * @brief GPIO Initialization Function
 * @PAram None
 * @retval None
 */
static void MX_GPIO_Init(void)
{

 /* GPIO Ports Clock Enable */
 __HAL_RCC_GPIOC_CLK_ENABLE();
 __HAL_RCC_GPIOH_CLK_ENABLE();
 __HAL_RCC_GPIOA_CLK_ENABLE();

}

/* USER CODE BEGIN 4 */
HAL_StatusTypeDef CAN_Polling(void)
{

 /*##-4- Start the Transmission process #####################################*/
 TxHeader.StdId = 0x11;
 TxHeader.RTR = CAN_RTR_DATA;
 TxHeader.IDE = CAN_ID_STD;
 TxHeader.DLC = 7;
 TxHeader.TransmitGlobalTime = DISABLE;
 TxData[0] = 0x43;
 TxData[1] = 0x52;
 TxData[2] = 0x45;
 TxData[3] = 0x56;
 TxData[4] = 0x41;
 TxData[5] = 0x56;
 TxData[6] = 0x49;

 /* Request transmission */
 if(HAL_CAN_AddTxMessage(&hcan1, &TxHeader, TxData, &TxMailbox) != HAL_OK)
 {
 /* Transmission request Error */
 Error_Handler();
 }

 /* Wait transmission complete */
 while(HAL_CAN_GetTxMailboxesFreeLevel(&hcan1) != 3) {}

 /*##-5- Start the Reception process ########################################*/
 if(HAL_CAN_GetRxFifoFillLevel(&hcan1, CAN_RX_FIFO0) != 1)
 {
 /* Reception Missing */
 Error_Handler();
 }

 if(HAL_CAN_GetRxMessage(&hcan1, CAN_RX_FIFO0, &RxHeader, RxData) != HAL_OK)
 {
 /* Reception Error */
 Error_Handler();
 }

 /* if((RxHeader.StdId != 0x11) ||
 (RxHeader.RTR != CAN_RTR_DATA) ||
 (RxHeader.IDE != CAN_ID_STD) ||
 (RxHeader.DLC != 7) ||
 ((RxData[0]<<8 | RxData[1]) != 0xCAFE))
 {
 Rx message Error
 return HAL_ERROR;
 }*/

 return HAL_OK; /* Test Passed */
}

/* 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 */

[Komal]

The pins are no pull up no pull down