Unable to receive messages from USB CAN Analyzer to STM32F407 Discovery board.

[rohitkumarkv07]

Hello,

I am trying to send the message from my USB-CAN Analyzer to my board STM32F407 discovery board, but I am unable to do that. 

HAL_CAN_GetRxMessage(&hcan1, CAN_RX_FIFO0, &rx_header, rx_data);



// Process received message

handleReceivedMessage(&rx_header, rx_data);

This is my function to read message.

void handleReceivedMessage(CAN_RxHeaderTypeDef *rx_header, uint8_t *rx_data)

{

// Your custom handling of received message

// Example: LED blinking based on received data

HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_12); // Toggle LED

}

This is my handlereceivedMessage function.

Below is my message which I am sending from USB-CAN Analyzer.

Best Regards

Rohit Kumar

[SofLit]

Hello,

In this previous thread I recommended you to review on how to post a thread on this community: https://community.st.com/t5/community-guidelines/how-to-write-your-question-to-maximize-your-chances-to-find-a/ta-p/575228

Could you please review it again and edit your post accordingly?

Thank you for your understanding

[rohitkumarkv07]

Hello,

Hello,

I am trying to send the message from my USB-CAN Analyzer to my board STM32F407 discovery board, but I am unable to do that.

while (1)
	{
		
		CAN_RxHeaderTypeDef rxHeader;
		uint8_t rx_data[8];

		HAL_CAN_GetRxMessage(&hcan1, CAN_RX_FIFO0, &rxHeader, rx_data);
		{
			// Process received message
			handleReceivedMessage(&rxHeader, rx_data);
		}
	}

This is my function to read message.

void handleReceivedMessage(CAN_RxHeaderTypeDef *rx_header, uint8_t *rx_data)
{
	// Your custom handling of received message
	// Example: LED blinking based on received data
	HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_12); // Toggle LED
}

This is my handlereceivedMessage function.

I have configured the interrupt too.

/*Enable CAN RX FIFO Interrupt in NVIC*/
	HAL_NVIC_SetPriority(CAN1_RX0_IRQn, 0, 0); // Set priority
	HAL_NVIC_EnableIRQ(CAN1_RX0_IRQn); // Enable interrupt

Below is my Can bit timing and filter configuration.

static void MX_CAN1_Init(void)
{

	/* USER CODE END CAN1_Init 1 */
	hcan1.Instance = CAN1;
	hcan1.Init.Prescaler = 4;
	hcan1.Init.Mode = CAN_MODE_NORMAL;
	hcan1.Init.SyncJumpWidth = CAN_SJW_1TQ;
	hcan1.Init.TimeSeg1 = CAN_BS1_12TQ;
	hcan1.Init.TimeSeg2 = CAN_BS2_3TQ;
	hcan1.Init.TimeTriggeredMode = DISABLE;
	hcan1.Init.AutoBusOff = DISABLE;
	hcan1.Init.AutoWakeUp = DISABLE;
	hcan1.Init.AutoRetransmission = DISABLE;
	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 can_filter;
	can_filter.FilterIdHigh = 0x0000;
	can_filter.FilterIdLow = 0x0000;
	can_filter.FilterMaskIdHigh = 0x0000;
	can_filter.FilterMaskIdLow = 0x0000;
	can_filter.FilterFIFOAssignment = CAN_FILTER_FIFO0;
	can_filter.FilterBank = 1;
	can_filter.FilterMode = CAN_FILTERMODE_IDMASK;
	can_filter.FilterScale = CAN_FILTERSCALE_32BIT;
	can_filter.FilterActivation = CAN_FILTER_ENABLE;
	can_filter.SlaveStartFilterBank = 2;
	if (HAL_CAN_ConfigFilter(&hcan1, &can_filter) != HAL_OK)
	{
		Error_Handler();
	}

}

I review it again and edit accordingly. The problem in the above query I am facing is the form error. I have my bit timing set to the 75% point. SJW=1, BS1=14, BS2= 5, 500,000baud. Could you please check and recommend me some accurate values for bit timings so that i can overcome this form error.

[SofLit]

Hello,

You activated the CAN interrupt :

	HAL_NVIC_SetPriority(CAN1_RX0_IRQn, 0, 0); // Set priority
	HAL_NVIC_EnableIRQ(CAN1_RX0_IRQn); // Enable interrupt

but you didn't use it and in the while loop you didn't check if a message has been received or not. This is not the correct implementation.

I suggest you to review the example provided in STM32CubeF4 in this path under https://github.com/STMicroelectronics/STM32CubeF4/tree/master/Projects/STM324xG_EVAL/Examples/CAN/CAN_Networking.

Also could you please attach your project (including the ioc file if there is one)?

[rohitkumarkv07]

Hello,

I am getting form error in CAN_ESR. According to my above configurations correct my bit timing configurations.

Best regards 

Rohit Kumar

[SofLit]

I think you accidently marked my answer as solution. I unmarked it then.

Need to check you bitrate config + the clock source config: need to have the same CAN bitrate as your CAN analyzer + If you are using HSI you need to change it to HSE with an external crystal.

But as a starting point use Loopback mode to at least validate your send/receive operations. If in Loopback mode doesn't work, it doesn't work also for Normal mode.

[rohitkumarkv07]

Hello,

My configuration works for the loopback mode, but it doesn't work for the normal mode.

B.R

Rohit Kumar

[SofLit · Accepted solution]

In that case I suspect the following issues:

1- A HW issue: check your wiring, the power supply of the transceiver , your transceiver connections, termination resistors. In that case you need to provide schematics of your board.

2- Bit timing issue: are you sure you have the same bitrate config as for your CAN analyzer?

3- The clock source: are you sing HSE and a crystal? if not you can face issue with CAN communication in normal mode.

You need also to share your project as requested previously.

[rohitkumarkv07]

Hello,

Can you suggest me how to implement HAL_CAN_GetRxFifoFillLevel for the reception of messages.

Explain it with example for just only reception.

B.R

Rohit Kumar

[SofLit]

https://github.com/STMicroelectronics/STM32CubeF4/tree/master/Projects/STM324xG_EVAL/Examples/CAN/CAN_Networking.