timer2.c

DSP28335外部时钟中断跑马灯程序

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

#define	  LedReg	(*((volatile  Uint16 *)0x41FF))
Uint16    *ExRamStart = (Uint16 *)0x100000;

interrupt void ISRTimer2(void);
Uint16  TimerFlag =0;


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
   InitXintf16Gpio();	//zq

// 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.TINT2 = &ISRTimer2;
   //PieVectTable.XINT13 = &cpu_timer1_isr;
   //PieVectTable.TINT2 = &cpu_timer2_isr;
   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


    ConfigCpuTimer(&CpuTimer2, 150, 200000);
	StartCpuTimer2();

// Enable CPU int1 which is connected to CPU-Timer 0, CPU int13
// which is connected to CPU-Timer 1, and CPU int 14, which is connected
// to CPU-Timer 2:
    IER |= M_INT14;

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

    }

}


interrupt void ISRTimer2(void)
{
    CpuTimer2.InterruptCount++;
	if (TimerFlag)  
	    LedReg = 0x55;
	else
        LedReg = 0xAA;
    TimerFlag = ~TimerFlag;
}

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// No more.
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