CCS/TMS320F28335: CAN communication

Part Number: TMS320F28335

Tool/software: Code Composer Studio

hi all, this is code. i want to check wheather it is receving datat or not.. how should i check in ccs . which register should i check??

,plz ,help me.

#include "DSP2833x_Device.h"

// external function prototypes
extern void InitSysCtrl(void);
extern void InitPieCtrl(void);
extern void InitPieVectTable(void);
extern void InitCpuTimers(void);
extern void ConfigCpuTimer(struct CPUTIMER_VARS *, float, float);
extern void InitECan(void);

// Prototype statements for functions found within this file.
void Gpio_select(void);
interrupt void cpu_timer0_isr(void);

//###########################################################################
// main code
//###########################################################################
void main(void)
{
struct ECAN_REGS ECanaShadow; // local copy of CAN registers
Uint16 temp;

InitSysCtrl(); // Basic Core Init from DSP2833x_SysCtrl.c

EALLOW;
SysCtrlRegs.WDCR= 0x00AF; // Re-enable the watchdog
EDIS; // 0x00AF to NOT disable the Watchdog, Prescaler = 64

Gpio_select(); // GPIO9, GPIO11, GPIO34 and GPIO49 as output
// to 4 LEDs at Peripheral Explorer

/* Initialize the CAN module */
// NOTE: first modify TI-file: InitECan() to 100kbps by setting BTR = 49
InitECan();

/* Write to Mailbox 1 message ID field */
ECanaMboxes.MBOX1.MSGID.all = 0x10000000; // extended identifier
ECanaMboxes.MBOX1.MSGID.bit.IDE = 1;

/* Configure Mailbox 1 as Receiver mailbox */
ECanaShadow.CANMD.all = ECanaRegs.CANMD.all;
ECanaShadow.CANMD.bit.MD1 = 1;
ECanaRegs.CANMD.all = ECanaShadow.CANMD.all;

/* Enable Mailbox 1 */
ECanaShadow.CANME.all = ECanaRegs.CANME.all;
ECanaShadow.CANME.bit.ME1 = 1;
ECanaRegs.CANME.all = ECanaShadow.CANME.all;

InitPieCtrl(); // basic setup of PIE table; from DSP2833x_PieCtrl.c

InitPieVectTable(); // default ISR's in PIE

EALLOW;
PieVectTable.TINT0 = &cpu_timer0_isr;
EDIS;

InitCpuTimers(); // basic setup CPU Timer0, 1 and 2

ConfigCpuTimer(&CpuTimer0,150,100000);

PieCtrlRegs.PIEIER1.bit.INTx7 = 1;

IER |=1;

EINT;
ERTM;

CpuTimer0Regs.TCR.bit.TSS = 0; // start timer0

while(1)
{
while(CpuTimer0.InterruptCount == 0);
CpuTimer0.InterruptCount = 0;

EALLOW;
SysCtrlRegs.WDKEY = 0x55; // service WD #1
EDIS;

if(ECanaRegs.CANRMP.bit.RMP1 == 1 ) // valid new data in MBX1?
{
temp = ECanaMboxes.MBOX1.MDL.byte.BYTE0; // read message
ECanaRegs.CANRMP.bit.RMP1 = 1; // clear the status flag RMP1
// and prepare MBX1 for next receive
if(temp & 1) // update LED LD1
GpioDataRegs.GPASET.bit.GPIO9 = 1;
else
GpioDataRegs.GPACLEAR.bit.GPIO9 = 1;
if(temp & 2) // update LED LD2
GpioDataRegs.GPASET.bit.GPIO11 = 1;
else
GpioDataRegs.GPACLEAR.bit.GPIO11 = 1;
if(temp & 4) // update LED LD3
GpioDataRegs.GPBSET.bit.GPIO34 = 1;
else
GpioDataRegs.GPBCLEAR.bit.GPIO34 = 1;
if(temp & 8) // update LED LD4
GpioDataRegs.GPBSET.bit.GPIO49 = 1;
else
GpioDataRegs.GPBCLEAR.bit.GPIO49 = 1;
}
}
}

void Gpio_select(void)
{
EALLOW;
GpioCtrlRegs.GPAMUX1.all = 0; // GPIO15 ... GPIO0 = General Puropse I/O
GpioCtrlRegs.GPAMUX2.all = 0; // GPIO31 ... GPIO16 = General Purpose I/O
GpioCtrlRegs.GPAMUX2.bit.GPIO30 = 1; // CANA_RX
GpioCtrlRegs.GPAMUX2.bit.GPIO31 = 1; // CANA_TX

GpioCtrlRegs.GPBMUX1.all = 0; // GPIO47 ... GPIO32 = General Purpose I/O
GpioCtrlRegs.GPBMUX2.all = 0; // GPIO63 ... GPIO48 = General Purpose I/O
GpioCtrlRegs.GPCMUX1.all = 0; // GPIO79 ... GPIO64 = General Purpose I/O
GpioCtrlRegs.GPCMUX2.all = 0; // GPIO87 ... GPIO80 = General Purpose I/O

GpioCtrlRegs.GPADIR.all = 0;
GpioCtrlRegs.GPADIR.bit.GPIO9 = 1; // peripheral explorer: LED LD1 at GPIO9
GpioCtrlRegs.GPADIR.bit.GPIO11 = 1; // peripheral explorer: LED LD2 at GPIO11

GpioCtrlRegs.GPBDIR.all = 0; // GPIO63-32 as inputs

GpioCtrlRegs.GPBDIR.bit.GPIO34 = 1; // peripheral explorer: LED LD3 at GPIO34
GpioCtrlRegs.GPBDIR.bit.GPIO49 = 1; // peripheral explorer: LED LD4 at GPIO49

GpioCtrlRegs.GPCDIR.all = 0; // GPIO87-64 as inputs
EDIS;
}

interrupt void cpu_timer0_isr(void)
{
CpuTimer0.InterruptCount++;
EALLOW;
SysCtrlRegs.WDKEY = 0xAA; // service WD #2
EDIS;
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}
//===========================================================================
// End of SourceCode.
//===========================================================================