原创 PIC24例程：LED亮度随电位器变化

 完整的工程文件

下面是主程序：

//PIC24FJ64GA002的第7个程序
//LED亮度随电位器变化
//邵子扬 2008.8.21
#include <p24Fxxxx.h>

#define LED   LATBbits.LATB12

unsigned char cnt = 0;
int main(void)
{
  TRISB = 0x0FFF;    //设置LED为输出RB15-RB12
  LATB = 0xFFFF;

  RPOR7bits.RP15R = 18;    //RP15作为OC1输出
  
  T2CON = 0;
  TMR2 = 0;
  PR2 = 1023;
  OC1CON = 0x0006;   //OC1设置为PWM
  OC1RS = 1000;
  T2CON = (1 << 15)|(0 << 5)|(0 << 4);   //启动时钟，1分频

  T3CON = 0;
  TMR3 = 0;
  PR3 = 144 - 1;                         //10ms
  T3CON = (1 << 15)|(1 << 5)|(1 << 4);   //启动时钟，256分频

  AD1PCFG = ~(1 << 5);//AN5作为模拟输入
  AD1CON1 = 0x8000;
  AD1CON2 = 0x0000;
  AD1CON3 = 0x0F00;
  AD1CSSL = 0;
  AD1CHS = 5;
  AD1CON1bits.SAMP = 1;

while(1)
{
if(IFS0bits.T3IF)//每10ms改变一次PWM状态
    {
      IFS0bits.T3IF = 0;

      cnt++;
if(cnt >= 100) //每秒改变一次LED状态
      {
        cnt = 0;
        LED = !LED;
}
      AD1CON1bits.SAMP = 0;
while(!AD1CON1bits.DONE);
      OC1RS = ADC1BUF0;    //设置OC1占空比
      AD1CON1bits.SAMP = 1;
}    
}

return 0;  
}