DSP-F2812输入捕捉例程.doc

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1、/*****************************************************************************由于本开发板的DSP内核的电压为1.8V，故只能运行在最高位135MHZ的时钟频率下将T1PWM_GPIOA6输出的PWM波与DSP的CAP1Q1_GPIOA8输入捕捉相接来测试输入捕捉功能将输入捕捉到的定时器的计数值之差,也就是两个上升沿之间的时间通过8个发刚二极管显示出来。注意：在开发板断电的情况下连接好两个引脚，然后再给开发板上电！*************************

2、*****************************************************/#include"DSP28_Device.h"interruptvoidcap1_isr(void);Uint16*LED8=(Uint16*)0x4100;//这是DSP开发板上的CPLD控制发光二级管的地址Uint16cap_value[2]={0};voidmain(void){InitSysCtrl();DINT;IER=0x0000;IFR=0x0000;InitPieCtrl();/*初始化PIE中断矢量表*/InitP

3、ieVectTable();EALLOW;PieVectTable.CAPINT1=&cap1_isr;EDIS;/*通用定时器1设置*/EvaRegs.GPTCONA.bit.T1PIN=1;/*effectiveislow*/EvaRegs.GPTCONA.bit.TCOMPOE=1;/*opencompareoutput*/EvaRegs.T1CON.bit.FREE=1;/*freelyrun*/EvaRegs.T1CON.bit.TMODE=2;EvaRegs.T1CON.bit.TPS=2;/*prescaleris4,HSPC

4、LK=60MHZ,pwmfrequency=150KHZ*/EvaRegs.T1PR=99;EvaRegs.T1CMPR=50;EvaRegs.T1CON.bit.TENABLE=1;EvaRegs.T1CON.bit.TCLD10=0;EvaRegs.T1CON.bit.TECMPR=1;/*通用定时器2设置*/EvaRegs.T2PR=0xffff;EvaRegs.T2CON.bit.FREE=1;/*freelyrun*/EvaRegs.T2CON.bit.TMODE=2;EvaRegs.T2CON.bit.TPS=1;/*presc

5、aleris2,HSPCLK=60MHZ,frequencyis30MHZ*/EvaRegs.T2CON.bit.TENABLE=1;EvaRegs.T2CON.bit.TCLD10=3;/*保留*/EvaRegs.T2CON.bit.TECMPR=1;/*捕获单元设置*/EvaRegs.CAPFIFO.bit.CAP1FIFO=0;EvaRegs.CAPCON.bit.CAP12TSEL=0;/*choosethegeneraltimer2*/EvaRegs.CAPCON.bit.CAP1EDGE=2;/*detectthefalling

6、edge*/EvaRegs.CAPCON.bit.CAPRES=1;EvaRegs.CAPCON.bit.CAPQEPN=1;/*enablecaptureuint1and2*/EvaRegs.EVAIFRC.bit.CAP1INT=1;/*cleartheflag*/EvaRegs.EVAIMRC.bit.CAP1INT=1;/*enabletheinterrupt*/EALLOW;GpioMuxRegs.GPAMUX.bit.T1PWM_GPIOA6=1;GpioMuxRegs.GPAMUX.bit.CAP1Q1_GPIOA8=1;/*

7、secondfunction*/EDIS;PieCtrl.PIEIER3.bit.INTx5=1;IER

8、=M_INT3;EINT;ERTM;*LED8=0xff;for(;;){}}interruptvoidcap1_isr(void){EvaRegs.EVAIFRC.bit.CAP1INT=1;EvaRegs.T1CNT=0;cap_value[0]=EvaRegs.CAP1FIFO;cap_value[1]=EvaRegs.CAP1FIFO;*LED8=~(char)(cap_value[1]-cap_value[0]);cap_va

9、lue[0]=0;cap_value[1]=0;asm("RPT#1

10、

11、NOP");PieCtrl.PIEACK.all=PIEACK_GROUP3;}