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CCS/RM48L952: CANRx as GIO

Sudharsan K
Intellectual 385 points
Part Number: RM48L952


Tool/software: Code Composer Studio

Hi,

For configuring CAN3Tx Pin as GIO the following code is used

canREG3->TIOC = canREG3->TIOC |   0x00000002 ; // Pin HIGH
canREG3->TIOC = canREG3->TIOC & 0xFFFFFFFD; // Pin low

Where: TIOC is defined in canBase volatile struct as follows:

uint32 TIOC; /**< 0x01E0: TX IO Control Register */
uint32 RIOC; /**< 0x01E4: RX IO Control Register */

I want to know the code that would set the CAN3Rx Pin as GIO.

Also let us know if both CANxTx & CANxRx shall be set High or Both pins shall be set to Low without any conflict?

  • 0
    TI__Guru**** 198766 points
    Hello Sudharsan,

    1. You need to reset the bit 3 to disable the CAN functional mode.
    2. Configure the pin as output by setting the bit 2
    3. Then write 0 or 1 to bit 1 to toggle the pin
  • 0 in reply to QJ Wang
    Intellectual 385 points
    Is there any app note for which I can refer to for more detailed instructions?
  • 0 in reply to QJ Wang
    Intellectual 385 points
    Is there any app note for which I can refer to for more detailed instructions?
  • 0 in reply to QJ Wang
    Intellectual 385 points
    Can you elaborate on this reply?


    I want to know the code for toggling RIOC pins HIGH & LOW
  • 0 in reply to Sudharsan K
    TI__Guru**** 198766 points
    Hello,

    This is the code I wrote for you. The values of the IO Control registers are only writable if Init bit of CAN Control Register is set. The OD, Func, Dir, and Out bits of the CAN TX IO Control register are forced to certain values when Init bit of CAN Control Register is reset.

    The code is to toggle CAN1 TX pin and RX pin. I just tested the code, it works well.

    canInit();
    for(i=0; i<100; i++){
    for(j=0; j<0x10000; j++);
    canREG1->CTL |= 0x00000001;
    if (ti == 0){
    ti=1;
    }else{
    ti=0;
    }
    canREG1->TIOC = (uint32)((uint32)1U << 18U )
    | (uint32)((uint32)0U << 17U )
    | (uint32)((uint32)0U << 16U )
    | (uint32)((uint32)0U << 3U ) /*GIO mode*/
    | (uint32)((uint32)1U << 2U ) /*output*/
    | (uint32)((uint32)ti << 1U ); /*high*/

    canREG1->RIOC = (uint32)((uint32)1U << 18U )
    | (uint32)((uint32)0U << 17U )
    | (uint32)((uint32)0U << 16U )
    | (uint32)((uint32)0U << 3U )
    | (uint32)((uint32)1U << 2U )
    | (uint32)((uint32)ti <<1U );
    canREG1->CTL &= 0xFFFFFFFE;
    }