DSP_代码笔记（基于TMS320X281x）--CPU定时器0模块

CPU定时器0模块初始化：

#include "DSP28_Device.h"

struct CPUTIMER_VARS CpuTimer0; //对用户开放的CPU定时器只有CpuTimer0，CpuTimer1
struct CPUTIMER_VARS CpuTimer1; //和CpuTimer2被保留用作实习操作系统OS（例如DSP
struct CPUTIMER_VARS CpuTimer2; //BIOS）

//初始化CpuTimer0。
void InitCpuTimers(void)
{
	CpuTimer0.RegsAddr = &CpuTimer0Regs; //使得CpuTimer0.RegsAddr 指向定时器寄存器
	
	CpuTimer0Regs.PRD.all  = 0xFFFFFFFF; //初始化CpuTimer0的周期寄存器

	CpuTimer0Regs.TPR.all  = 0;          //初始化定时器预定标计数器
	CpuTimer0Regs.TPRH.all = 0;
	
	CpuTimer0Regs.TCR.bit.TSS = 1;       //停止定时器       

	CpuTimer0Regs.TCR.bit.TRB = 1;       //将周期寄存器PRD中的值装入计数器寄存器TIM中           
	
	CpuTimer0.InterruptCount = 0;        //初始化定时器中断计数器
}	
	
//Timer（指定的定时器），Freq，Period
void ConfigCpuTimer(struct CPUTIMER_VARS *Timer, float Freq, float Period)
{
	Uint32 	temp;
	
	Timer->CPUFreqInMHz = Freq;
	Timer->PeriodInUSec = Period;
	temp = (long) (Freq * Period);
	Timer->RegsAddr->PRD.all = temp;  //给定时器周期寄存器赋值

	Timer->RegsAddr->TPR.all  = 0;    //给定时器预定标寄存器赋值
	Timer->RegsAddr->TPRH.all  = 0;
	
	// 初始化定时器控制寄存器:
	Timer->RegsAddr->TCR.bit.TIF=1;   //清除中断标志位
	Timer->RegsAddr->TCR.bit.TSS = 1; //停止定时器 
	Timer->RegsAddr->TCR.bit.TRB = 1; //定时器重装，将定时器周期寄存器的值装入定时器计数器寄存器
	Timer->RegsAddr->TCR.bit.SOFT = 1;
	Timer->RegsAddr->TCR.bit.FREE = 1;     
	Timer->RegsAddr->TCR.bit.TIE = 1; //使能定时器中断
	
	Timer->InterruptCount = 0;        //初始化定时器中断计数器
}

主函数模块：

#include "DSP28_Device.h"

void main()
{
	InitSysCtrl();
	DINT;
	IER = 0x0000;
	IFR = 0x0000;
	InitPieCtrl();
	InitPieVectTable();
	InitPeripherals();
	InitGpio();
	PieCtrl.PIEIER1.bit.INTx7 = 1;
	IER |= M_INT1;
	EINT;
	ERTM;
	ConfigCpuTimer(&CpuTimer0, 150, 1000000);
	StartCpuTimer0();
	for(;;)
	{
	}
}

CPU定时器0周期中断函数：

interrupt void  TINT0_ISR(void)      // CPU-Timer0中断函数
{
   CpuTimer0.InterruptCount++;
   
   if(CpuTimer0.InterruptCount==1)  
   {
      GpioDataRegs.GPFCLEAR.bit.GPIOF14=1;  //XF引脚低电平，D3亮
   }
   
   if(CpuTimer0.InterruptCount==2)
   {
      GpioDataRegs.GPFSET.bit.GPIOF14=1;    //XF引脚高电平，D3灭
      CpuTimer0.InterruptCount=0;
   }
   
   CpuTimer0Regs.TCR.bit.TIF=1;  //清除定时器中断标志位
   PieCtrl.PIEACK.bit.ACK1=1;    //响应同组其他中断
   EINT;  //开全局中断
}