How can I check this Transceiver, whether it is working or not? Which mode I should use(eg: Loopback, Normal.. etc)?
I tried to connect the CAN_TX,RX terminal directly to Transceiver input and checked the CAN_H,L terminal by using a DSO. I am not getting the differential signal as output. When I select Loopback mode,I am able to see the signle ended output through the DSO. I have added the signal image along with this.
Can anyone help me?
There should be a terminating R on the CAN bus side. For testing, you may set all "Basic Parameters" to disable or like that:
As you said I connected a resister across the CAN_H, CAN_L. Even though I am not getting the output.
I was getting proper otput when I am using Loopback mode. Once I changed the mode to Normal Mode data reception is not happening.
I came to know this throgh the debugging window. I did not use any Interrupt( Eg; CAN1_RX0_Interrpt), only used polling method.
I have added my code and BIT timing parameter as follows as follows.
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 */
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)
{
Error_Handler();
}
else
{
t1=1;
}
if(HAL_CAN_Start(&hcan1) != HAL_OK)
{
Error_Handler();
}
else
{
t2=1;
}
if((HAL_CAN_ActivateNotification(&hcan1, CAN_IT_RX_FIFO0_MSG_PENDING | CAN_IT_TX_MAILBOX_EMPTY)) != HAL_OK)
{
Error_Handler();
}
else
{
t3=1;
}
TxMessage.StdId = 0x321;
TxMessage.ExtId = 0x01;
TxMessage.RTR = CAN_RTR_DATA;
TxMessage.IDE = CAN_ID_STD;
TxMessage.DLC = 8;
TxMessage.TransmitGlobalTime = DISABLE;
TxData[0] = 1;
TxData[1] = 2;
TxData[2] = 3;
TxData[3] = 4;
TxData[4] = 5;
TxData[5] = 6;
TxData[6] = 7;
TxData[7] = 8;
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
HAL_CAN_AddTxMessage(&hcan1, &TxMessage, TxData, &TxMailbox);
HAL_Delay(500);
TxData[7] = TxData[7] + 1;
t4 = HAL_CAN_GetTxMailboxesFreeLevel(&hcan1);
//
t5 = HAL_CAN_GetRxFifoFillLevel(&hcan1, CAN_RX_FIFO0);
HAL_CAN_GetRxMessage(&hcan1, CAN_RX_FIFO0, &RxMessage, RxData);
HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_5);
}
Can you please help me?
