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TMS570LC4357: CAN3 Rx / Tx pins configurable as general purpose IO pins

Vinayaka Naik
Prodigy 100 points
Part Number: TMS570LC4357
Other Parts Discussed in Thread: TMS570LS3137, HALCOGEN,

Hi,

I am using TMS570LC4357 Launchpad Board with CCS v7.3 and Halcogen 4.07. I am trying to convert CAN3 pins(DCAN3RX - M19  & DCAN3TX - M18)as GPIO pins but not able to control it.. But it working in TMS570LS3137 HDK. Even i can able to convert CAN2 pins as GPIO pins . But it is not working for CAN3.

  • 0
    TI__Guru**** 196776 points
    Hi Vinayaka,

    The CANRX and CANTX pins can be sued as GPIO pins. This function is controlled by the DCAN TIOC and DCAN RIOC registers.
    The bit 3 of these two register should be cleared to zero.

    The CAN3 TX is routed to Pin 15 of J10, and CAN3 RX signal is routed to Pin 13 of J10.
  • 0 in reply to QJ Wang
    Prodigy 100 points

    Dear QJ,

    I tried it but still it is not working. I have done following changes in canInit() function

    /** - CAN3 Port output values */
    canREG3->TIOC = (uint32)((uint32)1U << 18U )
    | (uint32)((uint32)0U << 17U )
    | (uint32)((uint32)0U << 16U )
    | (uint32)((uint32)0U << 3U )
    | (uint32)((uint32)0U << 2U )      //Before it was 1
    | (uint32)((uint32)0U << 1U );

    canREG3->RIOC = (uint32)((uint32)1U << 18U )
    | (uint32)((uint32)0U << 17U )
    | (uint32)((uint32)0U << 16U )
    | (uint32)((uint32)0U << 3U )  
    | (uint32)((uint32)0U << 2U )     //Before it was 1
    | (uint32)((uint32)0U << 1U );

  • 0 in reply to Vinayaka Naik
    TI__Guru**** 196776 points
    Hi Vinayaka,

    The Func bit in RIOC and TIOC register should be set for GIO mode. Please check those two registers after executing canInit() if the Func bit is cleared.