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标题: pic16f54可调LED亮度程序 [打印本页]

作者: star 时间: 2012-8-20 10:50
标题: pic16f54可调LED亮度程序
按钮控制LED亮度芯片PIC16F54 晶振4M

#include<pic.h>
#define uchar  unsigned char
#define uint unsigned int
__CONFIG (XT&WDTEN&CP) ;
#define LED  RB1

#define  K1 RB3
#define  K2 RB2

#define  KEY PORTB
#define  keyi  0B1100
uchar LED_pc,h,l,LEDH,LEDL;

static  bit  HL_bit;
static volatile  bit TM_RBit @ ((unsigned)&TMR0*8)+5;
void TMR0_interrupt(void);

void TMR0_interrupt()
{  if(TM_RBit)
{ TM_RBit=0;
   if(HL_bit){if(h>0)h--; }
   else    {if(l>0)l--; }
}
else return ;
}

void main()
  { uchar i;
OPTION=0B00000000; // 预分频器分配给定时器0
TRISB=0B1101;
LEDH= h=0;
LEDL=l=255;
   while(1){ CLRWDT();
            TMR0_interrupt();
            if(HL_bit){if(h>0)LED=1;else {l=LEDL;HL_bit=0;}}
            else    {if(l>0)LED=0;else {h=LEDH;HL_bit=1;}}
            if((KEY&keyi)!=keyi)//按健扫描
            {i--;
               if((i==0) )
                  {
                  if(!K1&&LEDH<255){ LEDH++;LEDL--;}
                  if(!K2&&LEDL<255){ LEDH--;LEDL++;}
                  }
            }
            else i=0;//按健扫描计数器清0
      }

  }

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