利用PIC16F1947的PWM模块做了两个呼吸灯

Dedy01 · 发表于 2016-7-2 14:38

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小弟学习PIC16F1947，自己根据画了一个原理图（见附件），以后会把所有要做的程序都发上来，程序是用状态机写的，推荐给大家。

/*
*@Name:       PWM_led
*@version  1.0
*@Author       xiaopan
*@Date             2014.8.2
*/

#include<pic.h>
#define uint unsigned int
#define uchar unsigned char

#define PWM1(x)                      {CCPR3L = x>>2;DC3B0 = 1;DC3B1 = 1;}       //       X  X>>1
#define PWM2(x)                      {CCPR4L = x>>2;DC4B0 = 1;DC4B1 = 1;}       //  X  X>>1

uint Time = 0;
uint cnt_1ms = 0;
uchar State = 0;

void GPIO_INIT();
void TIMER2_INIT();
void TIMER4_INIT();
void PWM_INIT();
void Control_Task();

/*
*@function 主函数
*/
void main()
{
      GPIO_INIT();
      PWM_INIT();
      TIMER2_INIT();                               //PWM利用TIMER2
      TIMER4_INIT();                               //定时1S出发改变一次占空比，调节PWM波形
      while(1)
      {
            Control_Task();
      }
}
/*
*@Function             IO口初始化 RG0       CCP3       RG3       CCP4
*/
void GPIO_INIT()
{
      TRISG = 0X00;       //设置RG口为输出
      ANSELG = 0;             //设置RG口为数字量
      LATG = 0;             //设置RG口为低电平

      TRISF = 0;
      ANSELF = 0;
      LATF = 0;
}

/*
*@定时器2初始化
*/
void TIMER2_INIT()
{
      TMR2 = 0;
      PR2 = 255;             //255

      TMR2IF = 0;

      T2CKPS0 = 1;       //1
      T2CKPS1 = 0;       //0

      TMR2ON = 1;
}

/*
*@定时器4初始化
*/
void TIMER4_INIT()
{
      T4CON = 0x0e;                      //0000 1110

      TMR4IE = 1;
      TMR4IF = 0;

      TMR4 = 0X00;

      PEIE = 1;
      GIE = 1;
}

/*
*@ PWM初始化
*/
void PWM_INIT()
{
      CCP3CON = 0X0C;
      CCP4CON = 0X0C;

      CCPTMRS0 &= 0X0F;

      TRISG = 0;
}

/*
*@Function 主任务函数
*/
void Control_Task()
{
      static uint Time ;
//       static uchar State = 0;
      static uint Record_Time;
      uint Delta_Time;

      if(State == 0)
      {
            Time = 1000;
            State = 1;

      }
      if(State == 1)
      {
            PWM1(Time);
            PWM2(Time);

            Record_Time = cnt_1ms;

            State = 2;
      }

      if(State == 2)
      {
            if (cnt_1ms < Record_Time)
            {
                     Delta_Time = 65536 - Record_Time + cnt_1ms;
            }
            else
            {
                     Delta_Time = cnt_1ms - Record_Time;
            }

            if (Delta_Time >= 200)                      //300MS循环一次执行新的PWM_OUT
            {
                     Time = Time - 100;
                     State = 1;

                     if(Time == 0)
                     {
                              Time = 0;
                              State = 3;
                     }
            }
      }

      if(State == 3)
      {
            PWM1(Time);
            PWM2(Time);

            Record_Time = cnt_1ms;

            State = 4;
      }

      if(State == 4)
      {
            if (cnt_1ms < Record_Time)
            {
                     Delta_Time = 65536 - Record_Time + cnt_1ms;
            }
            else
            {
                     Delta_Time = cnt_1ms - Record_Time;
            }

            if (Delta_Time >= 200)                      //300MS循环一次执行新的PWM_OUT
            {
                     Time = Time + 100;
                     State = 3;

                     if(Time == 1000)
                     {
                              State = 0;
                     }
            }
      }
}

void interrupt ISR(void)
{
      if(TMR4IF == 1)
      {
            TMR4IF = 0;
            cnt_1ms++;

      //       LATF0 = !LATF0;
      }
}