Stm32f446re CAN start error

[Yakry]

CAN Bus Not Starting - HAL_CAN_Start() Error (0x00020000)

Post:

I'm facing an issue where my CAN bus does not start. Tera Term shows the following messages:

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CAN1 Instance Address: 0x40006400 CAN Error Code: 0x00020000

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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(); 
MX_TIM6_Init(); 
MX_USART2_UART_Init(); 
/* USER CODE BEGIN 2 */ 
filter_config(); 
HAL_CAN_ActivateNotification(&hcan1, CAN_IT_RX_FIFO0_MSG_PENDING); 
sprintf(msg, "CAN1 Instance Address: 0x%08lX\n", (uint32_t)hcan1.Instance); 
HAL_UART_Transmit(&huart2, (uint8_t *)msg, strlen(msg), HAL_MAX_DELAY); 
if (HAL_CAN_Start(&hcan1) != HAL_OK) 
{ 
  sprintf(msg, "CAN Error Code: 0x%08lX\n", HAL_CAN_GetError(&hcan1)); 
  if (HAL_UART_Transmit(&huart2, (uint8_t *)msg, strlen(msg), HAL_MAX_DELAY) != HAL_OK) 
  {
    Error_Handler(); 
  } 
  Error_Handler(); 
}

I have already checked the following:
:heavy_check_mark:CAN1 initialization (MX_CAN1_Init())
:heavy_check_mark:Notifications (HAL_CAN_ActivateNotification)
:heavy_check_mark:Debugging in STM32CubeIDE

[mƎALLEm]

Hello,

Are you familiar with the CAN protocol? if not CAN is not SPI or UART to use it in standalone (only one node) in Normal mode.

So what is your CAN configuration: Loopback or Normal mode?

If Normal mode, are you establishing a complete CAN bus by using transceivers? Refer to this figure.

Also, to help you efficiently you need to provide the schematics including the transceivers + your complete project including the ioc file.

Did you try the Loopback mode? what did you find? see also this article if it's the case.