DSP28335 ecap使用

输入捕获有4级捕获，最多可以得到4个捕获时间，捕获记性可以任意配置

可用于测速，测脉冲周期，频率，占空比等

cap.c

#include "cap.h"

void InitCap(void)

{

InitECap5Gpio();

InitECap6Gpio();

SetCap5();

SetCap6();

}

void SetCap5(void)

{

ECap5Regs.ECCTL1.bit.CAP1POL = EC_RISING;

ECap5Regs.ECCTL1.bit.CAP2POL = EC_FALLING; //EC_RISING;

ECap5Regs.ECCTL1.bit.CAP3POL = EC_RISING;

ECap5Regs.ECCTL1.bit.CAP4POL = EC_FALLING;

ECap5Regs.ECCTL1.bit.CTRRST1 = EC_ABS_MODE;

ECap5Regs.ECCTL1.bit.CTRRST2 = EC_ABS_MODE;

ECap5Regs.ECCTL1.bit.CTRRST3 = EC_ABS_MODE;

ECap5Regs.ECCTL1.bit.CTRRST4 = EC_ABS_MODE;

ECap5Regs.ECCTL1.bit.CAPLDEN = EC_ENABLE;

ECap5Regs.ECCTL1.bit.PRESCALE = EC_DIV1;

ECap5Regs.ECCTL2.bit.CAP_APWM = EC_CAP_MODE;

ECap5Regs.ECCTL2.bit.CONT_ONESHT = EC_CONTINUOUS; //连续捕获

ECap5Regs.ECCTL2.bit.SYNCO_SEL = EC_SYNCO_DIS;

ECap5Regs.ECCTL2.bit.SYNCI_EN = EC_DISABLE;

ECap5Regs.ECEINT.all=0x0000;//stop all interrupt

ECap5Regs.ECCLR.all=0xFFFF;//clare all flag

ECap5Regs.ECCTL2.bit.TSCTRSTOP = EC_RUN;// 启动

ECap5Regs.ECEINT.bit.CEVT4=1;// Enable cevt4 interrupt //第4个捕获事件发生时，产生中断

}

void SetCap6(void)

{

ECap6Regs.ECCTL1.bit.CAP1POL = EC_FALLING;

ECap6Regs.ECCTL1.bit.CAP2POL = EC_FALLING;

ECap6Regs.ECCTL1.bit.CAP3POL = EC_FALLING;

ECap6Regs.ECCTL1.bit.CAP4POL = EC_FALLING;

ECap6Regs.ECCTL1.bit.CTRRST1 = EC_ABS_MODE;

ECap6Regs.ECCTL1.bit.CTRRST2 = EC_ABS_MODE;

ECap6Regs.ECCTL1.bit.CTRRST3 = EC_ABS_MODE;

ECap6Regs.ECCTL1.bit.CTRRST4 = EC_ABS_MODE;

ECap6Regs.ECCTL1.bit.CAPLDEN = EC_ENABLE;

ECap6Regs.ECCTL1.bit.PRESCALE = EC_DIV1;

ECap6Regs.ECCTL2.bit.CAP_APWM = EC_CAP_MODE;

ECap6Regs.ECCTL2.bit.CONT_ONESHT = EC_CONTINUOUS;

ECap6Regs.ECCTL2.bit.SYNCO_SEL = EC_SYNCO_DIS;

ECap6Regs.ECCTL2.bit.SYNCI_EN = EC_DISABLE;

ECap6Regs.ECEINT.all=0x0000;//stop all interrupt

ECap6Regs.ECCLR.all=0xFFFF;//clare all flag

ECap6Regs.ECCTL2.bit.TSCTRSTOP = EC_RUN;// 启动

ECap6Regs.ECEINT.bit.CEVT4=1;// Enable cevt4 interrupt

}

Uint32 t1,t2,t3,t4,T1,T2;

interrupt void ISRCap5(void)

{

// Acknowledge this interrupt to receive more interrupts from group 1

PieCtrlRegs.PIEACK.all = PIEACK_GROUP4;

ECap5Regs.ECCLR.all=0xFFFF;//clare all flag

t1= ECap5Regs.CAP1;

t2= ECap5Regs.CAP2;

t3= ECap5Regs.CAP3;

t4= ECap5Regs.CAP4;

T1=t2-t1;T2=t3-t1;

}

Uint32 t5,t6,t7,t8,T3,T4;

interrupt void ISRCap6(void)

{

// Acknowledge this interrupt to receive more interrupts from group 1

PieCtrlRegs.PIEACK.all = PIEACK_GROUP4;

ECap6Regs.ECCLR.all=0xFFFF;//clare all flag

t5= ECap6Regs.CAP1;

t6= ECap6Regs.CAP2;

t7= ECap6Regs.CAP3;

t8= ECap6Regs.CAP4;

T3=t6-t5;T4=t8-t7;

}

cap.h

#ifndef CAP_H_

#define CAP_H_

#include "main.h"

extern Uint32 t1,t2,t3,t4,T1,T2;

extern Uint32 t5,t6,t7,t8,T3,T4;

void InitCap(void);

void SetCap5(void);

void SetCap6(void);

interrupt void ISRCap5(void);

interrupt void ISRCap6(void);

#endif /* CAP_H_ */

main函数中要调用的

InitCap(); //输入捕获初始化

PieVectTable. ECAP5_INT = &ISRCap5; //输入捕获5

IER |= M_INT4; //输入捕获

PieVectTable. ECAP6_INT = &ISRCap6; //输入捕获6

PieCtrlRegs.PIEIER4.bit.INTx5 = 1; //输入捕获5中断

PieCtrlRegs.PIEIER4.bit.INTx6 = 1; //输入捕获6中断