TMS320F28335: LED blink with SYSBIOS

#include <xdc/std.h>
#include <xdc/runtime/Error.h>
#include <xdc/runtime/System.h>
#include <ti/sysbios/BIOS.h>
#include <ti/sysbios/knl/Task.h>

void LED_Init(void)
{
    EALLOW;
    GpioCtrlRegs.GPAMUX1.bit.GPIO4 = 0;
    GpioCtrlRegs.GPADIR.bit.GPIO4 = 1;
    GpioCtrlRegs.GPAMUX1.bit.GPIO5 = 0;
    GpioCtrlRegs.GPADIR.bit.GPIO5 = 1;
    GpioCtrlRegs.GPAMUX1.bit.GPIO6 = 0;
    GpioCtrlRegs.GPADIR.bit.GPIO6 = 1;
    GpioCtrlRegs.GPAMUX1.bit.GPIO7 = 0;
    GpioCtrlRegs.GPADIR.bit.GPIO7 = 1;
    EDIS;
}

Void taskFxn(UArg a0, UArg a1)
{
    System_printf("Task started ...\n");
    System_flush();

    LED_Init();

    while (1)
    {
        GpioDataRegs.GPATOGGLE.bit.GPIO4 = 1; // Toggle GPIO0 once per 500 milliseconds
        GpioDataRegs.GPATOGGLE.bit.GPIO5 = 1; // Toggle GPIO1 once per 500 milliseconds
        GpioDataRegs.GPATOGGLE.bit.GPIO6 = 1; // Toggle GPIO2 once per 500 milliseconds
        GpioDataRegs.GPATOGGLE.bit.GPIO7 = 1; // Toggle GPIO3 once per 500 milliseconds

        Task_sleep(1000);

        System_printf("Task running ...\n");
        System_flush();
    }

    System_printf("Task Done.\n");

    System_flush();
}

Int main()
{
    // Initialize the peripheral clocks
    InitPeripheralClocks();

    Task_Handle task;
    Error_Block eb;

    Error_init(&eb);
    task = Task_create(taskFxn, NULL, &eb);
    if (task == NULL)
    {
        System_printf("Failed to create task. Stop.\n");
        BIOS_exit(0);
    }

    BIOS_start();

    return(0);
}

#include "DSP2833x_Device.h"     // DSP2833x Headerfile Include File
#include "DSP2833x_Examples.h"   // DSP2833x Examples Include File

void main(void)
{
    // Step 1. Initialize System Control:
    // PLL, WatchDog, enable Peripheral Clocks
    // This example function is found in the DSP2833x_SysCtrl.c file.
    InitSysCtrl();

    // Step 2. Initalize GPIO:
    // This example function is found in the DSP2833x_Gpio.c file and
    // illustrates how to set the GPIO to it's default state.
    // InitGpio();  // Skipped for this example


    // Step 3. Clear all interrupts and initialize PIE vector table:
    // Disable CPU interrupts
    //   DINT;

    // Initialize the PIE control registers to their default state.
    // The default state is all PIE interrupts disabled and flags
    // are cleared.
    // This function is found in the DSP2833x_PieCtrl.c file.
    //   InitPieCtrl();

    // 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).
    // This will populate the entire table, even if the interrupt
    // is not used in this example.  This is useful for debug purposes.
    // The shell ISR routines are found in DSP2833x_DefaultIsr.c.
    // This function is found in DSP2833x_PieVect.c.
    //   InitPieVectTable();

    // Interrupts that are used in this example are re-mapped to
    // ISR functions found within this file.
    //   EALLOW;  // This is needed to write to EALLOW protected registers
    //   PieVectTable.TINT0 = &cpu_timer0_isr;

    //   Count = 0;					//��ʼ������
    //   Flag=0;

    //   EDIS;    // This is needed to disable write to EALLOW protected registers

    // Step 4. Initialize the Device Peripheral. This function can be
    //         found in DSP2833x_CpuTimers.c
    //   InitCpuTimers();   // For this example, only initialize the Cpu Timers
    #if (CPU_FRQ_150MHZ)
    // Configure CPU-Timer 0 to interrupt every 500 milliseconds:
    // 150MHz CPU Freq, 50 millisecond Period (in uSeconds)
    //   ConfigCpuTimer(&CpuTimer0, 150, 500000);
    #endif
    #if (CPU_FRQ_100MHZ)
    // Configure CPU-Timer 0 to interrupt every 500 milliseconds:
    // 100MHz CPU Freq, 50 millisecond Period (in uSeconds)
    //   ConfigCpuTimer(&CpuTimer0, 100, 500000);
    #endif

    // To ensure precise timing, use write-only instructions to write to the entire register. Therefore, if any
    // of the configuration bits are changed in ConfigCpuTimer and InitCpuTimers (in DSP2833x_CpuTimers.h), the
    // below settings must also be updated.

    //   CpuTimer0Regs.TCR.all = 0x4001; // Use write-only instruction to set TSS bit = 0

    // Step 5. User specific code, enable interrupts:

    // Configure GPIO0-3 as a GPIO output pin
    EALLOW;
    GpioCtrlRegs.GPAMUX1.bit.GPIO4 = 0;
    GpioCtrlRegs.GPADIR.bit.GPIO4 = 1;
    GpioCtrlRegs.GPAMUX1.bit.GPIO5 = 0;
    GpioCtrlRegs.GPADIR.bit.GPIO5 = 1;
    GpioCtrlRegs.GPAMUX1.bit.GPIO6 = 0;
    GpioCtrlRegs.GPADIR.bit.GPIO6 = 1;
    GpioCtrlRegs.GPAMUX1.bit.GPIO7 = 0;
    GpioCtrlRegs.GPADIR.bit.GPIO7 = 1;
    EDIS;

    // Enable CPU INT1 which is connected to CPU-Timer 0:
    //   IER |= M_INT1;

    // Enable TINT0 in the PIE: Group 1 interrupt 7
    //   PieCtrlRegs.PIEIER1.bit.INTx7 = 1;

    // Enable global Interrupts and higher priority real-time debug events:
    //   EINT;   // Enable Global interrupt INTM
    //   ERTM;   // Enable Global realtime interrupt DBGM

    // Step 6. IDLE loop. Just sit and loop forever (optional):
    for(;;)
    {
        GpioDataRegs.GPATOGGLE.bit.GPIO4 = 1; // Toggle GPIO0 once per 500 milliseconds
        GpioDataRegs.GPATOGGLE.bit.GPIO5 = 1; // Toggle GPIO1 once per 500 milliseconds
        GpioDataRegs.GPATOGGLE.bit.GPIO6 = 1; // Toggle GPIO2 once per 500 milliseconds
        GpioDataRegs.GPATOGGLE.bit.GPIO7 = 1; // Toggle GPIO3 once per 500 milliseconds

        DELAY_US(100000);
    }
}