Description
This function is called by the application to obtain a frame from the opened CAN bus. The function will wait for a frame to be received on the CAN bus or until the configured timeout is reached.
Prototype
CPU_INT16S CanBusRead(CPU_INT16S busId,
void *buffer,
CPU_INT16U size);
| Parameter | Meaning |
|---|---|
| busId | Unique bus identifier |
| buffer | Pointer to CAN frame of type CANFRM |
| size | Size of buffer in bytes (must be equal to sizeof(CANFRM)) |
Note:
A timeout is not handled as an error, therefore the return value in this case is 0.
Return Value
One of the error codes CAN_ERR_BUSID, CAN_ERR_NULLPTR, CAN_ERR_FRMSIZE or CAN_ERR_OSFREE if an error is detected. Otherwise the number of bytes of a CAN frame is returned.