Associate III

Solved

Stm32F4 CANbus Acknowledgment error problem

12 replies
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Hello everyone. The last time I opened a form related to bit timing, I realized that the problem was in the Canbus transceiver. I added 1-2 revisions and replaced it with the MCP2551 transceiver. Even though there is a device on the other side, I get an acknowledgment error and the logic analyzer is as follows.

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S

SergenBest answer

Associate III

Solution: First, I changed the CAN2 mode to loopback and tried to receive data, but I could not receive it. Then I edited the time segment 1 and 2 values and after receiving the data in loopback mode, I tried normal mode and my system worked.

LCE

Principal III

On the CAN bus, connect CANH with CANH, and CANL with CANL.

Then maybe remove one of the 120R resistors.

S

SergenAuthor

Associate III

Thanks for your support, I will give you feedback when I try it

S

SergenAuthor

Associate III

I found the problem. The message is going to the other party's RX line incorrectly. How can I fix this

Karl Yamashita

Principal

Post some code

If a reply has proven helpful, click on Accept as Solution so that it'll show at top of the post.CAN Jammer an open source CAN bus hacking toolCANableV3 Open Source

S

SergenAuthor

Associate III

Transmit

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_Start(&hcan2);

TxHeader.DLC = 1;

TxHeader.IDE = CAN_ID_STD;

TxHeader.RTR = CAN_RTR_DATA;

TxHeader.StdId = 0x407;

TxData[0] = 0xFA;

HAL_CAN_ActivateNotification(&hcan2,CAN_IT_RX_FIFO0_MSG_PENDING);

/* USER CODE END 2 */

/* Infinite loop */

/* USER CODE BEGIN WHILE */

while (1)

{

// int state = HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_0);

// if(state){

HAL_CAN_AddTxMessage(&hcan2,&TxHeader,TxData,&TxMailbox);

// HAL_GPIO_WritePin(GPIOD, GPIO_PIN_13,GPIO_PIN_SET);

// }

// else{

// HAL_GPIO_WritePin(GPIOD, GPIO_PIN_13,GPIO_PIN_RESET);

// }

HAL_Delay(200);

/* USER CODE END WHILE */

/* USER CODE BEGIN 3 */

}

/* USER CODE END 3 */

}

S

SergenAuthor

Associate III

Receiver

/* USER CODE BEGIN Includes */

CAN_RxHeaderTypeDef RxHeader;

uint8_t RxData[2];

/* 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 hcan;

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/

void SystemClock_Config(void);

static void MX_GPIO_Init(void);

static void MX_CAN_Init(void);

/* USER CODE BEGIN PFP */

void HAL_CAN_RxFifo0FullCallback(CAN_HandleTypeDef *hcan){

HAL_CAN_GetRxMessage(hcan,CAN_RX_FIFO0,&RxHeader,RxData);

}

/* 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_CAN_Init();

/* USER CODE BEGIN 2 */

HAL_CAN_Start(&hcan);

HAL_CAN_ActivateNotification(&hcan,CAN_IT_RX_FIFO0_MSG_PENDING);

/* USER CODE END 2 */

/* Infinite loop */

/* USER CODE BEGIN WHILE */

while (1)

{

/* USER CODE END WHILE */

/* USER CODE BEGIN 3 */

}

/* USER CODE END 3 */

}

Karl Yamashita

Principal

Edit your post and use Code Sample so it formats your code which makes it easier to read your code

UseCode Snippet.png

If a reply has proven helpful, click on Accept as Solution so that it'll show at top of the post.CAN Jammer an open source CAN bus hacking toolCANableV3 Open Source

S

SergenAuthor

Associate III

thanks

LCE

Principal III

> I found the problem. The message is going to the other party's RX line incorrectly.

What do you exactly mean? Some hardware wiring problem?

S

SergenAuthor

Associate III

I did but let me do it again

S

SergenAuthorBest answer

Associate III

Solution: First, I changed the CAN2 mode to loopback and tried to receive data, but I could not receive it. Then I edited the time segment 1 and 2 values and after receiving the data in loopback mode, I tried normal mode and my system worked.

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