HAL_CAN_transmit_issue

[Markose Baby]

Posted on September 08, 2017 at 14:05

Hi, I am using StM32f042f4 (20 pin) for my project. I am getting stuck in can transmit. Logic work fine with different m0 controller. How can i solve it ? How do i check the error? 

#include 'main.h'

#include 'stm32f0xx_hal.h'CAN_HandleTypeDef hcan;

CanTxMsgTypeDef TxMsg;

CanRxMsgTypeDef RxMsg;

void SystemClock_Config(void);

static void MX_GPIO_Init(void);static void MX_CAN_Init(void);

int main(void)

HAL_Init(); SystemClock_Config(); MX_GPIO_Init(); MX_CAN_Init();

TxMsg.Data[0] = 0xc0;

TxMsg.Data[1] = 0xc1; TxMsg.Data[2] = 0xc2; TxMsg.Data[3] = 0xc3; TxMsg.Data[4] = 0xc4; TxMsg.Data[5] = 0xc5; TxMsg.DLC = 6; TxMsg.StdId = 0x204; TxMsg.IDE = CAN_ID_STD; TxMsg.RTR = CAN_RTR_DATA; hcan.pTxMsg = &TxMsg; hcan.pRxMsg = &RxMsg; while (1) {HAL_CAN_Transmit(&hcan,10000); HAL_Delay(1000);

}

}

static void MX_CAN_Init(void)

{

hcan.Instance = CAN;

hcan.Init.Prescaler = 16; hcan.Init.Mode = CAN_MODE_NORMAL; hcan.Init.SJW = CAN_SJW_1TQ; hcan.Init.BS1 = CAN_BS1_3TQ; hcan.Init.BS2 = CAN_BS2_5TQ; hcan.Init.TTCM = DISABLE; hcan.Init.ABOM = DISABLE; hcan.Init.AWUM = DISABLE; hcan.Init.NART = DISABLE; hcan.Init.RFLM = DISABLE; hcan.Init.TXFP = DISABLE; if (HAL_CAN_Init(&hcan) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); }

}

[T J]

Posted on September 10, 2017 at 03:16

enable hcan.Init.ABOM = ENABLE

this will definately stop it working...

[Markose Baby]

Posted on September 11, 2017 at 09:53

@

Marsh.Nick

Thank you for your reply.

But enabling that didn't solve my problem. Checked the Error status and I found it as LEC dominant Error.Can you help me with the reason for errorand how could I resolve it ?

[T J]

Posted on September 11, 2017 at 23:21

LEC ? I never see this error.

are your wires swapped ?

what CanBus Driver chip are you using ?

do you have a CanBus Dongle like CanDo ?

can you receive frames ?

Did you use CubeMX to set your bit rate ?

Do you have a n Oscilloscope ?

[Markose Baby]

Posted on September 12, 2017 at 06:07

1) HAL_CAN_ERROR_BD LEC dominant  ( as per the hal documnet )

2) MCP 2562.... CAN transceiver used. 

3)I I didn't receive any frame.

4)  All Set in Cube MX as below

static void MX_CAN_Init(void)

{

hcan.Instance = CAN;

hcan.Init.Prescaler = 16;hcan.Init.Mode = CAN_MODE_NORMAL;hcan.Init.SJW = CAN_SJW_1TQ;hcan.Init.BS1 = CAN_BS1_3TQ;hcan.Init.BS2 = CAN_BS2_5TQ;hcan.Init.TTCM = DISABLE;hcan.Init.ABOM = DISABLE;hcan.Init.AWUM = DISABLE;hcan.Init.NART = DISABLE;hcan.Init.RFLM = DISABLE;hcan.Init.TXFP = DISABLE;

}

5) I am using IXXAT can USB interface to connect PC and device.m 

[T J]

Posted on September 12, 2017 at 11:57

is CanRx pin on the processor high ?  if not try a 10k pullup.

do you have an oscilloscope ?

can you check the TX baud rate you are expecting ?

[Rachel Duray]

Posted on July 13, 2018 at 11:22

Hello Markose,

I think u missed the initialization of addresses of 

TxMsg and RxMsg. Can you define in  

MX_CAN_Init function as 

  hcan.pTxMsg = &

TxMsg

;