Posted on April 22, 2015 at 01:27SO I am incredibly confused. I have an application that uses CANbus. I have the transmit running fine and I am to the point where I am receiving interrupts when I receive a message. so I am confused by the lack of documents, but can anyone tell me what the difference is between HAL_CAN_Receive_IT() and HAL_CAN_Receive()?
I have seen code samples with HAL_CAN_Receive in the ISR and I have seen HAL_CAN_Receive_IT in regular code. I am not sure how to get to the data when I am in the ISR.
I have seen samples that look like this:
CanRxMsgTypeDef RMess;
RMess.FIFONumber = CAN_FIFO1;
RMess.FMI = 14;
RMess.StdId = 0x541;
RMess.DLC = 0;
RMess.RTR = 0;
RMess.IDE = CAN_ID_STD;
hcan2.pRxMsg = &RMess;
HAL_CAN_Receive_IT(&hcan2,CAN_FIFO1);
/* USER CODE BEGIN 3 */
/* Infinite loop */
while (1)
I don't understand why I would want to pre-populate RMess if I am about to overwrite it with receive data. I already have a filter.
Can someone please help me understand these APIs and how I get data after the interrupt arrives?
BY the way -- I have a fully operational canbus and several nodes receiving the data and sending me data. I understand the transceivers and terminations. I can see the data arriving at the device with the scope and I am getting the interrupt when data arrives.
Thanks
Steve
#c
