CCS/TMS320F28379D: CAN bus assigned to CPU2

Tool/software: Code Composer Studio

Hi all.

I want use the CANB from CPU2. I started from a working code for CPU1 and modified it for dual core applications (ControlSuite library).

The CPU1 initializes the system and the GPIO, then assign the peripheral to the CPU2 as follow:

//  Main function

int main(void)

{

//    struct PCLKCR10_BITS CPUSEL8_conn;

    // Initialize System Control

    InitSysCtrl();

    InitGpio();

    GPIO_SetupPinMux(17, GPIO_MUX_CPU2, 2); //GPIO10 -  CANRXB

    GPIO_SetupPinOptions(17, GPIO_INPUT, GPIO_ASYNC);

    GPIO_SetupPinMux(12, GPIO_MUX_CPU2, 2);  //GPIO8 - CANTXB

    GPIO_SetupPinOptions(12, GPIO_OUTPUT, GPIO_PUSHPULL);

    DINT;

    InitPieCtrl();

    IER = 0x0000;

    IFR = 0x0000;

    InitPieVectTable();

    /*

     *  Transfer ownership of CAN BUS to CPU02

     *  e2e.ti.com/.../623258

     *  CPU control. Defines the owner

     *  0: Connected to CPU1

     *  1: Connected to CPU2

     */

    EALLOW;

    DevCfgRegs.CPUSEL8.bit.CAN_B = 1; //CPU2 is the owner

    EDIS;

    while(1){;}

The CPU2 configure the CAN bus device and use it. Hereafter is reported the CPU2 init code.

int main(void)

{

    uint32_t status;

    InitSysCtrl();   // Initialize System Control and clock

    DINT;    // Disable CPU interrupts

    InitPieCtrl(); // Initialize PIE control registers to their default state.

    //

    // Disable CPU interrupts and clear all CPU interrupt flags:

    //

        IER = 0x0000;

        IFR = 0x0000;

    //

    // Initialize the PIE vector table with pointers to the shell Interrupt

    // Service Routines (ISR).

        InitPieVectTable();

    // uses CANB

    CANInit(CANB_BASE);

//-------------------

    // CANClkSourceSelect(CANB_BASE, SOURCE);

    // select the SOURCE input as follow:

    //!        0 - Selected CPU SYSCLKOUT (CPU1.Sysclk or CPU2.Sysclk)

    //!           (default at reset) \n

    //!        1 - External Oscillator (OSC) clock (direct from X1/X2) \n

    //!        2 - AUXCLKIN = GPIOn(GPIO19)

    CANClkSourceSelect(CANB_BASE, 0);   // 500kHz CAN-Clock

    CANBitRateSet(CANB_BASE, 200000000, 500000);

    //

    // Power up the CAN bus

    //

        EALLOW;

        CpuSysRegs.PCLKCR10.bit.CAN_B = 1;

        EDIS;

(… configure packets and transmit/receive.)

From examples, reference manual and datasheet I cannot understand why I cannot communicate with it. The test is executed with a LaunchPad - F28379D development kit.

Thanks,

  Luigi