TMS320F2812 ecan transmit receive interrupt ISSUE

Hello

My software needs to send and receive messages using interrupts.

I have used a sample found on this forum but it doesn't work.

Here is my code:

interrupt void ecan1intA_isr(void)
{
  unsigned int mailbox_nr;
 
    mailbox_nr = ECanaRegs.CANGIF1.bit.MIV1;

  if(mailbox_nr == 0)  // mailbox #1 receive message
  {     
//    GpioDataRegs.GPBDAT.all = ECanaMboxes.MBOX1.MDL.byte.BYTE0 & 0x000000FF;
//    ECanaShadow.CANRMP.bit.RMP1 = 1;
//    ECanaRegs.CANRMP.all = ECanaShadow.CANRMP.all;
   
    CTC_FetchRequest();
  }
 
  if(mailbox_nr == 5)  // mailbox #5 transmit-message
  {   
//    ECanaShadow.CANTA.all = 0;
//    ECanaShadow.CANTA.bit.TA5 = 1;
//    ECanaRegs.CANTA.all = ECanaShadow.CANTA.all;
     
    CTC_MASTER_ProcessVCUrequest();     
     
       CanMBox5Quit = 1;
  }
 
  PieCtrlRegs.PIEACK.bit.ACK9 = 1;
}

void main()

{

//
    LedInit();
   
// Initialize System Control registers, PLL, WatchDog, Clocks to default state:
// This function is found in the DSP28_SysCtrl.c file.       
    InitSysCtrl();

//    Enable Watchdog
    EALLOW;
      SysCtrlRegs.WDCR= 0x00AE;
      EDIS;
     
// Initialise the physical pins of the DSP
    Gpio_select();     
   
// Initialize Interrupt System PIE
    InitPieCtrl();
      InitPieVectTable();

// Overload CPU Timer 0 and CAN1 ISR - entry
      EALLOW;
      PieVectTable.TINT0 = &cpu_timer0_isr;
      PieVectTable.ECAN1INTA = &ecan1intA_isr;
      EDIS;

// Iitialize CPU - Timer system   
    InitCpuTimers();

    //
    InitECan(); // TODO: Le rescriem
   
    ///
    ConfigMailBox_0_RX(); // TODO: Le rescriem
   
// enable interrupt lines
    PieCtrlRegs.PIEIER1.bit.INTx7 = 1;  // TINT0
    PieCtrlRegs.PIEIER9.bit.INTx6 = 1;  // ECAN1INTA
      IER |= 0x0101;
      EINT;   


// setup CPU-Timer 0 to 50 ms   
      ConfigCpuTimer(&CpuTimer0,150,50000);
      CpuTimer0.InterruptCount =0;
      CpuTimer0Regs.TCR.bit.TSS = 0;

while (1)

{

!!!(1)    if(CpuTimer0.InterruptCount >= 20)
    {
        CpuTimer0.InterruptCount = 0;
        if(CanMBox5Quit == 1)     // prev. transmission completed
        {
            CanMBox5Quit=0;
           
            //ECanaMboxes.MBOX5.MDL.byte.BYTE0 = send_data & 0x00FF;
   
            //ECanaShadow.CANTRS.bit.TRS5 = 1;
            //ECanaRegs.CANTRS = ECanaShadow.CANTRS;
   
            //send_data++;        // next payload
            //send_data %= 256;  // limit to 8 bit
           
            LedSwitch();
           
            GpioDataRegs.GPBTOGGLE.bit.GPIOB0 = 1;
        }
    }

}

}

!!!(1) - what is the utility of this condition and variable CpuTimer0.InterruptCount??

2 - the interrupt function "ECanaRegs.CANRMP.bit.RMP0" it never gets runed because i see the value of ECanaRegs.CANRMP.bit.RMP0 with my JTAG module and it is 1.

Thanks.

Regards.