AM2634: AM2634 demo board cannot stop at breakpoints?

environment:

              CCS 12.7.0  

              AM263x-LP Evaluation Board(red) 

              demo rti_blink_am263x-lp_r5fss0-0_nortos_ti-arm-clang

I modified the clock configuration.（Unmentioned and unmodified）

              syscfg:   input clock freq: 200MHz

                            input clock source: SYS_CLK

                            enable counter block 0

                            desired output frequency: 1M

                            enable compare event0

                            Tick Period (usecs): 500,000

Modifications in the main function 

    System_init();
    Board_init();

    rti_led_blink(NULL);
    while(1);
//    Board_deinit();
//    System_deinit();

    return 0;

Modifications in the rti_led_blink.c  

    /* Wait until the LED is blinked specified number of times */
    //while(gBlinkCount < LED_BLINK_COUNT);

    /* Stop the RTI counter */
    //RTI_counterDisable(CONFIG_RTI0_BASE_ADDR, RTI_TMR_CNT_BLK_INDEX_0);

    DebugP_log("[RTI LED Blink Test] Timer Stopped...\r\n");

    if(SystemP_SUCCESS == status)
    {
        DebugP_log("All tests have passed!!\r\n");
    }
    else
    {
        DebugP_log("Some tests have failed!!\r\n");
    }

//    Board_driversClose();
//    Drivers_close();

above to make sure led blink foever

I also added a breakpoint on "gBlinkCount++"

void rtiEvent0(void)
{
    if(gLedState == LED_ON)
    {
        GPIO_pinWriteLow(gpioBaseAddr, pinNum);
        gLedState = LED_OFF;
    }
    else{
        GPIO_pinWriteHigh(gpioBaseAddr, pinNum);
        gLedState = LED_ON;
    }
    gBlinkCount++;
}

expect result:

1.code will stop at line "gBlinkCount++"

2.when I disable breakpoint, led will blink every 0.5s and run forever

actual result:

1. code will always not stop at line "gBlinkCount++". When I manually pause the code, the variable gBlinkCount do increase, which is consistent with the number of LED flashes I observe.

    I'm not sure if it's CCS's bug or my wrong configuration

2. code will blink about 30s and then code goes to 0x000039DE (this just sometimes happens)

3. the register "RTI0_RTICOMP0" always count up during running my program (always happen)