ChibiOS Free Embedded RTOS

hal_can.h should define the CANRxFrame/CANTxFrame structures. The structure definitions are currently entirely inside hal_can_lld.h . If there are any platform specific members needed (for example, FMI and TIME in STM32), those should be in macros defined in hal_can_lld.h, and included at the end of the CAN frame structures in hal_can.h .

I will eventually rework this after evaluating the changes required for CAN FD which uses different frames.

Giovanni