cputimer.c

来自「开发环境为CCS。DSP12个典型例子源码」· C语言 代码 · 共 134 行

// TI File $Revision: /main/3 $
// Checkin $Date: July 2, 2007   11:33:22 $
//###########################################################################
//
// FILE:    Example_281xCpuTimer.c
//
// TITLE:   DSP281x Device Getting Started Program.
//
// ASSUMPTIONS:
//
//          This program requires the DSP281x V1.00 header files.  
//          As supplied, this project is configured for "boot to H0" operation.
//
//          Other then boot mode configuration, no other hardware configuration
//          is required.   
//
// DESCRIPTION:
//
//          This example configures CPU Timer0 and increments
//          a counter each time the timer asserts an interrupt.
//      
//          Watch Variables:
//                 CpuTimer0.InterruptCount
//
//###########################################################################
// $TI Release: DSP281x Header Files V1.11 $
// $Release Date: September 26, 2007 $
//###########################################################################


#include "DSP281x_Device.h"     // DSP281x Headerfile Include File
#include "DSP281x_Examples.h"   // DSP281x Examples Include File

// Prototype statements for functions found within this file.
interrupt void cpu_timer0_isr(void);
void Gpio_select(void);
unsigned int Led_Flag;
void main(void)
{

   /*初始化系统*/
   InitSysCtrl();
   
   Gpio_select();

   /*关中断*/
   DINT;
   IER = 0x0000;
   IFR = 0x0000;
   
   /*初始化PIE*/
   InitPieCtrl();

   /*初始化PIE中断矢量表*/
   InitPieVectTable();

   EALLOW;  
   PieVectTable.TINT0 = &cpu_timer0_isr;
   EDIS;    

   /*初始化定时器*/
   InitCpuTimers();   

// Configure CPU-Timer 0 to interrupt every second:
// 100MHz CPU Freq, 1 second Period (in uSeconds)
   ConfigCpuTimer(&CpuTimer0, 10, 1000000);
   StartCpuTimer0();


// 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;

   EINT;  
   ERTM;   

   for(;;);

} 


interrupt void cpu_timer0_isr(void)
{
   CpuTimer0.InterruptCount++;

   // Acknowledge this interrupt to receive more interrupts from group 1
   PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
   if(Led_Flag == 1)
	{	
		GpioDataRegs.GPADAT.bit.GPIOA13=0;
		GpioDataRegs.GPBDAT.bit.GPIOB0=0;
		GpioDataRegs.GPADAT.bit.GPIOA11=0;
		GpioDataRegs.GPBDAT.bit.GPIOB1=0;
		GpioDataRegs.GPADAT.bit.GPIOA10=1;
		GpioDataRegs.GPBDAT.bit.GPIOB2=1;
		GpioDataRegs.GPADAT.bit.GPIOA9=1;
		GpioDataRegs.GPBDAT.bit.GPIOB3=1;
		Led_Flag = 0;
	}
	else
	{	GpioDataRegs.GPADAT.bit.GPIOA13=1;
		GpioDataRegs.GPBDAT.bit.GPIOB0=1;
		GpioDataRegs.GPADAT.bit.GPIOA11=1;
		GpioDataRegs.GPBDAT.bit.GPIOB1=1; 
		GpioDataRegs.GPADAT.bit.GPIOA10=0;
		GpioDataRegs.GPBDAT.bit.GPIOB2=0;
		GpioDataRegs.GPADAT.bit.GPIOA9=0;
		GpioDataRegs.GPBDAT.bit.GPIOB3=0;  
		Led_Flag = 1;
	}
}

void Gpio_select(void)
{
	EALLOW; 
	GpioMuxRegs.GPAMUX.bit.CAP2Q2_GPIOA9=0;
	GpioMuxRegs.GPAMUX.bit.CAP3QI1_GPIOA10=0;
	GpioMuxRegs.GPAMUX.bit.TDIRA_GPIOA11=0;
	GpioMuxRegs.GPAMUX.bit.C1TRIP_GPIOA13=0;
	GpioMuxRegs.GPBMUX.bit.PWM7_GPIOB0=0;
	GpioMuxRegs.GPBMUX.bit.PWM8_GPIOB1=0;
	GpioMuxRegs.GPBMUX.bit.PWM9_GPIOB2=0;
	GpioMuxRegs.GPBMUX.bit.PWM10_GPIOB3=0;
	GpioMuxRegs.GPADIR.all=0xFFFF;
	GpioMuxRegs.GPBDIR.all=0xFFFF;
	EDIS;
}

//===========================================================================
// No more.
//===========================================================================