[LOOK] LOOK+红杏头文件 学习第八帖：PWM小练

 

flag_t Flag_PWM(0);



// 任务类 task_LOOK_PWM_t 的例程

void task_LOOK_PWM_t::routine()

{

// TODO: 在此编写 task_LOOK_PWM_t 例程的内容

uint8_t PWM0_Duty_Cycle = 50;   //PWM初始化占空比为50

//Enable PWM engine clock and reset PWM

SYSCLKs.APBCLK.Bits.PWM01_EN = 1;       //PWM01时钟使能

SYSs.IPRSTC2.Bits.PWM03_RST = 1;     // PWM03复位

SYSs.IPRSTC2.Bits.PWM03_RST = 0;  //PWM03开始工作

SYSCLKs.CLKSEL1.Bits.TMR0_S = 0b000; //外部12M晶振

PWM0s.PCR.Bits.CH0INV = 0;    //反向关闭

PWM0s.PCR.Bits.CH0MOD = 1;    //自动重载

PWM0s.PPR.Bits.CP01 = 1;    //预分频  1 

PWM0s.CSR.Bits.CSR0 = 0b100;   //分频系数 1

uint16_t u16Duty = 12000000/((1+1)*1*400);//PWM 频率 400HZ

PWM0s.CNR0.Regs = u16Duty-1;     //PWM 频率 = PWMxy_CLK/(prescale+1)*(clock divider)/(CNR+1); 

PWM0s.CMR0.Regs = u16Duty*PWM0_Duty_Cycle/100-1; //占空比 = (CMR+1)/(CNR+1).

PWM0s.POE.Bits.PWM0 = 1;    //PWM0输出使能

//PA.12作为PWM0   使用LOOK进行配置

PWM0s.PCR.Bits.CH0EN = 1;    // 使能PWM功能 

while (true) {

  // TODO: 在此编写 task_LOOK_PWM_t 例程的内容

  uart0.puts("WM0当前设置占空比为:0x");

  uart0.put_numeral(PWM0_Duty_Cycle);

  uart0.puts("%\n");

  int flag = Flag_PWM.wait(0b011, flag_t::ANY_CONSUME); 

     switch (flag)

     {

      case 0x01:

    //占空比增加10%

    if (PWM0_Duty_Cycle!=100)

    {

     PWM0_Duty_Cycle +=10;

     PWM0s.CMR0.Regs = u16Duty*PWM0_Duty_Cycle/100-1;  //更新占空比

    }

    break;

   case 0x02:

    //占空比减少10%

    if (PWM0_Duty_Cycle!=0)

    {

     PWM0_Duty_Cycle -=10;

     if (PWM0_Duty_Cycle!=0)

      PWM0s.CMR0.Regs = u16Duty*PWM0_Duty_Cycle/100-1;  //更新占空比

     else PWM0s.CMR0.Regs = 0;

    }

    break;

  }

}

}

#ifdef LOOK_SCHEDULING_PRIORITY

instantiate::task<task_LOOK_PWM_t, LOOK_STACK_SIZE> task_LOOK_PWM(0);

#else

instantiate::task<task_LOOK_PWM_t, LOOK_STACK_SIZE> task_LOOK_PWM;

#endif

#ifndef __LOOK_PWM_H

#define __LOOK_PWM_H



#include "look_config.h"

#include <look.h>

#include <instantiate>



// 任务类 task_LOOK_PWM_t 的定义

class task_LOOK_PWM_t : public task_t {

public:

task_LOOK_PWM_t() __OPT_ATTR__; // 构造函数



protected:

void routine(); // 任务例程

};



// 任务类 LOOK_PWM 的构造函数

__OPT_INLINE__ task_LOOK_PWM_t::task_LOOK_PWM_t()

{

// TODO: 在此初始化 task_LOOK_PWM_t 的类成员

}



extern flag_t Flag_PWM;



extern instantiate::task<task_LOOK_PWM_t, LOOK_STACK_SIZE> task_LOOK_PWM;



#endif // __LOOK_PWM_H