Pwm波形，頻率，占空比，可調，且LCD1602顯示占空比

ID:297159 · 發表于 2018-4-20 16:17

#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int //float fosc=12000000;  //系統時鐘頻率
sbit key1=P1^1;    //控制周期的增加
sbit key2=P1^2;       //控制周期的減少
sbit key3=P1^3;    //控制占空比的增加
sbit key4=P1^4;       //控制占空比的減少
sbit clk=P1^0; //pwm輸出
sbit wei=P2^7;
sbit duan=P2^6;
sbit RS = P3^5;
sbit RW = P3^6;
sbit EN = P3^4;
uint zkb=50;    //占空比初值，取值范圍為1到99
uint shi,ge;
uint period=35;    //周期初值，取值范圍為5ms到60ms
uint time0_H,time0_L,time1_H,time1_L;  //延時程序
  void delayms(uint z)
{ uint i,j;
   for(i=z;i--;i>0)
      for(j=110;j--;j>0);
}
  //系統初始化
/*uint code leddata[]={

            0x3F,  //"0"
            0x06,  //"1"
            0x5B,  //"2"
            0x4F,  //"3"
            0x66,  //"4"
            0x6D,  //"5"
            0x7D,  //"6"
            0x07,  //"7"
            0x7F,  //"8"
            0x6F,  //"9"
            0x77,  //"A"
            0x7C,  //"B"
            0x39,  //"C"
            0x5E,  //"D"
            0x79,  //"E"
            0x71,  //"F"
            0x76,  //"H"
            0x38,  //"L"
            0x37,  //"n"
            0x3E,  //"u"
            0x73,  //"P"
            0x5C,  //"o"
            0x40,  //"-"
            0x00,  //熄滅
            0x00  //自定義

                     }; */
//void display(uint i)
/*{
uint shi,ge;
shi=i/10;
ge=i%10;

P0=0xff;
wei=1;
P0=0xfe;//1111 1110
wei=0;

duan=1;
P0=leddata[shi];
duan=0;
delayms(10);

P0=0xff;
wei=1;
P0=0xfd;//1111 1101
wei=0;

duan=1;
P0=leddata[ge];
duan=0;
delayms(10);

}*/
  void init()
  {  TMOD=0x11;    //定時器0和1都工作在方式1
   time0_H=(65536-35000)/256;
   time0_L=(65536-35000)%256; //35ms定時
   time1_H=(65536-17500)/256;
   time1_L=(65536-17500)%256; //17.5ms定時，50%占空比
   TH0=time0_H;
//定時器0裝入初值，計數器計數35000次，35ms
   TL0=time0_L;
   TH1=time1_H; //定時器1裝入初值，計數器計數17500次，17.5ms
   TL1=time1_L;
   IT0=1;    //外部中斷0為下降沿觸發
   EX0=1;    //開外部中斷0允許位
   ET0=1;    //定時器T0中斷允許
   ET1=1;    //定時器T1中斷允許
   EA=1;    //開啟總中斷
   TR0=1;    //開啟定時器0
  }
//判斷液晶忙，如果忙則等待    第一步：讀狀態
void Read_Busy()
{
uchar busy;
P0 = 0xff; //給P0送1111 1111
RS = 0;
RW = 1;
do
{
EN = 1;
busy = P0;
EN = 0;
}while(busy & 0x80);//讀寫檢測，判斷STA7為是否位1,為1，則忙，循環等待。
}
//寫LCD1602一個字節命令
void Write_Cmd(uchar cmd)    //第二步：寫指令
{
Read_Busy();//判斷忙
RS = 0;
RW = 0;
P0 = cmd;
EN = 1;
EN = 0;
}
//寫一個字節數據
void Write_Dat(uint dat)    //第三步：寫數據
{
Read_Busy();
RS = 1;
RW = 0;
P0 = dat;
EN = 1;
EN = 0;
}
void LCD_init()
{
Write_Cmd(0x38);//設置16*2顯示
Write_Cmd(0x0c);//開顯示顯示光標，光標閃爍
Write_Cmd(0x01);//清屏

Write_Cmd(0x06);//地址指針移位命令
}
  //主程序
  void main()
  {
      uint num[2];
      init( );

shi=zkb/10;
ge=zkb%10;

      num[0]=shi;
      num[1]=ge;

      LCD_init();

//Write_Cmd(0x80 | 0x00);//顯示地址
while(1)
{
      shi=zkb/10;
ge=zkb%10;
      num[0]=shi;
      num[1]=ge;
   Write_Cmd(0x80 | 0x00);//顯示地址
Write_Dat(25 + 'A');  //z
Write_Dat(10 + 'A');  //k
Write_Dat(1 + 'A');    //b
Write_Dat(0x3A);    //:
Write_Dat(num[0]+'0'); //十位
Write_Dat(num[1]+'0'); //個位
delayms(10);
}
}
  //TO中斷程序

  void T0_time() interrupt 1 //控制PWM波的周期
{
   TR1=1;          //開定時器1
   TH0=time0_H;
   TL0=time0_L;
   clk=1;
   } //T1中斷程序
  void T1_time() interrupt 3 //控制PWM波的占空比
{ TR1=0;          //關定時器1
   TH1=time1_H;
   TL1=time1_L;
   clk=0;
   } //鍵盤掃描程序
  void  keyscan()  interrupt 0 //外部中斷0，用來查詢是否有按鍵按下
   { float TX,TZ; //定義浮點型變量，4字節長度
      EX0=0;          //關中斷
      delayms(10);    //延時消抖
      if(P1!=0x1e)    //延時消抖完畢，判斷的確有按鍵按下
   if(key1==0)       //判斷是哪個按鍵按下
      {
   period=period+5;
   if(period>60)
      period=5;
   }
   if(key2==0)
      {    period=period-5;
   if(period<5)
               period=60;
   }
if(key3==0)
   {

         zkb=zkb+1;


   if(zkb>99)
               zkb=1;
      }
         if(key4==0)
               {

   zkb=zkb-1;

   if(zkb<1)
   zkb=99;
   }
      TX=(65536-(period)*1000);//周期計算 �。。�！
      TZ=(65536-(period/2)*1000+(50-zkb)*period*10);//占空比計算？？？
      time0_H=(uint)TX/256;
            time0_L=(uint)TX%256;
            time1_H=(uint)TZ/256;
            time1_L=(uint)TZ%256;
      P1=0x1e;  //P1口重新賦值，以便下次按鍵判斷
            EX0=1; //開外部中斷
      TR0=1;  //開定時器0
      TR1=1; //開定時器1
   }