Hi,
I am using two STM32F103 Nucleo boards and STM32CubeIDE.
I can see in the oscilloscope the Tx sinal outputs some data when the mode is configured as loopback. But when I switch the mode to normal I can see in the oscilloscope only a short low level pulse and then the channel returns to high level.
Why is this happening?
How can I configure the CAN to work in normal mode?
The first code block is the configuration and the second is the call to transmitt
hcan.Instance = CAN1;
hcan.Init.Prescaler = 16;
hcan.Init.Mode = CAN_MODE_NORMAL;
hcan.Init.SyncJumpWidth = CAN_SJW_1TQ;
hcan.Init.TimeSeg1 = CAN_BS1_12TQ;
hcan.Init.TimeSeg2 = CAN_BS2_4TQ;
hcan.Init.TimeTriggeredMode = DISABLE;
hcan.Init.AutoBusOff = DISABLE;
hcan.Init.AutoWakeUp = DISABLE;
hcan.Init.AutoRetransmission = DISABLE;
hcan.Init.ReceiveFifoLocked = DISABLE;
hcan.Init.TransmitFifoPriority = DISABLE;
if (HAL_CAN_Init(&hcan) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN CAN_Init 2 */
TxHeader.StdId = 0x245;
TxHeader.DLC = 1;
TxHeader.ExtId = 0;
TxHeader.IDE = CAN_ID_STD;
TxHeader.RTR = CAN_RTR_DATA;
TxHeader.TransmitGlobalTime = DISABLE;
//filter one (stack light blink)
sFilterConfig.FilterFIFOAssignment=CAN_FILTER_FIFO0; //set fifo assignment
sFilterConfig.FilterIdHigh=0x245<<5; //the ID that the filter looks for (switch this for the other microcontroller)
sFilterConfig.FilterIdLow=0;
sFilterConfig.FilterMaskIdHigh=0;
sFilterConfig.FilterMaskIdLow=0;
sFilterConfig.FilterScale=CAN_FILTERSCALE_32BIT; //set filter scale
sFilterConfig.FilterBank = 0;
sFilterConfig.FilterMode = CAN_FILTERMODE_IDMASK;
sFilterConfig.FilterActivation=ENABLE;
HAL_CAN_ConfigFilter(&hcan, &sFilterConfig); //configure CAN filter
HAL_CAN_Start(&hcan); //start CAN
HAL_CAN_ActivateNotification(&hcan, CAN_IT_RX_FIFO0_MSG_PENDING); //enable interrupts
if (HAL_CAN_AddTxMessage(&hcan, &TxHeader, CAN_tx_array, (uint32_t*)&mail_box) != HAL_OK)
{
Error_Handler();
}
Thanks!!
Daniel
