pwm.c

此程序可以显示输入波形

//--------------------------------------------------------------------                  



//模块：PWM.C

//功能：PWM解码模块

//晶振：24.000MHz

//芯片: STC12C5412AD

#include "stc12c5412ad.h"
//#ifndef  lcd12864_driver_new
//#include "lcd12864_driver_new.h"
//#endif
#define uchar unsigned char                  

#define uint unsigned int

#define CNT 32

//--------------------------------------------------------------------

extern uchar keyfuncindex;

extern void d2(void);

extern void lcd_init(void);

extern void dis_one_char(uchar x,uchar y,uchar asc_num,bit b_flag);

extern void dis_one_zi(uchar x_add,uchar y_add,uchar code *po,bit back_flag,bit char_moudle);

extern void delay(uint time);

extern void delay_1(uchar time);

extern void dis_cls(void);

extern uchar code tab[16];

uchar data value_h[CNT];

uchar count=0;

sbit key0=P3^0;

sbit key1=P3^1;

//--------------------------------------------------------------------

void pwm_init()

{

      TMOD=0x01;

      TH0=0;

      TL0=0;

      IT0=1;

      EX0=1;

      EA=1;

}

//--------------------------------------------------------------------

void clk() interrupt 0 

{

      if(TH0==TL0 && TL0==0)

      {

              TR0=1;

      }

      else

      {

              TR0=0;

              value_h[count]=TH0;

              TH0=0;

              TL0=0;

              TR0=1;

              count++;

              if(count==CNT-1)

              {

                    EX0=0;

                    count=0;

                    TH0=0;

                    TL0=0;

                    TR0=0;

              }

      }

}

//--------------------------------------------------------------------

void bin_to_hex(uchar x,uchar y,uchar bin)

{

      uchar b_h,b_l;

      b_h=bin & 0xf0;

      b_h>>=4;

      b_h=tab[b_h];

      b_l=bin & 0x0f;

      b_l=tab[b_l];

      y*=2;

      dis_one_char(x,y,b_h,1);

      dis_one_char(x,y+1,b_l,1);

}

//--------------------------------------------------------------------

void pwm()

{

      uchar i=0,x=0,y=0,ii;

      pwm_init();

      dis_cls();

      while(1)

      {

              for(x=0;x<4;x++)

              {

                    for(y=0;y<8;y++)

                    {

                            ii=value_h[i++];

                            bin_to_hex(x,y,ii);

                            

                    }

              }

              i=0;

              key0=1;

              key1=1;

              delay_1(5);

              if(key0==0 || key1==0)

              {

                    

                    for(i=0;i<32;i++)

                    {

                            value_h[i]=0;

                            

                    }

                    goto exit;

                            }

      }

      exit:for(i=0;i<32;i++)

                    {

                            value_h[i]=0;

                            

                    }

      TMOD=0x00;

      TH0=0;

      TL0=0;

      count=0;

      EX0=0;

      EA=0;

      TR0=0;

      TR1=0;

      keyfuncindex=2;

      d2();

}