Freertos with Tc29x

[tccxy]

Hi：
I use your code on my Tc297 development board,

void test_task1(void *pvParameters)
{
    char data_test[10] = {1};
    int n = 100000000, i;
    Ifx_print("test_task1\r\n");


    while (1)
    {
        IfxPort_setPinState(LED1, IfxPort_State_toggled);
        while (n--);
        n = 100000000;
        //vTaskDelay(1000);
    }
}

void test_task2(void *pvParameters)
{
    int n = 100000000, i;
    Ifx_print("test_task2\r\n");


    while (1)
    {
        IfxPort_setPinState(LED2, IfxPort_State_toggled);
        while (n--);
        n = 100000000;
        Ifx_print("test_task2\r\n");
        //vTaskDelay(1000);
    }
}

I found that the vTaskDelay is not valid, and once one task USES vTaskDelay, another task will not gain CPU time,
Do you know why? thank you