C51 COMPILER V7.08   PWM                                                                   05/12/2007 17:30:02 PAGE 1   


C51 COMPILER V7.08, COMPILATION OF MODULE PWM
OBJECT MODULE PLACED IN pwm.OBJ
COMPILER INVOKED BY: D:\工具安裝目錄二\Keil C51\C51\BIN\C51.EXE pwm.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          #include <reg52.h>
   2          //#include <at89x52.h>
   3          //#include <keyscan.h>
   4          extern void scan_full(void);
   5          extern unsigned char key_scan(void);
   6          extern bit key_ok;
   7          unsigned char pwm_set,key_value;
   8          unsigned char count;
   9          sbit PWM=P3^6;
  10          bit up,down,set_flag;
  11          unsigned char code BCD[]={0x3f,0x06,0x5b,0x4f, //此處是將0-F轉(zhuǎn)換成相應(yīng)的BCD碼
  12                                    0x66,0x6d,0x7d,0x07, 
  13                                    0x7f,0x6f,0x77,0x7c, 
  14                                    0x39,0x5e,0x79,0x71};
  15          void delay1(unsigned char t)
  16          {
  17   1       while(t--);
  18   1      }
  19          
  20          
  21          
  22          void pwm(void) interrupt 5//定時器2產(chǎn)生PWM波形
  23          {
  24   1              TF2=0;                                  //定時器2的溢出標(biāo)志要軟件清除,
  25   1                                                              //但當(dāng)RCLK或TCLK為1時由硬件清除
  26   1              if((count>=pwm_set)&&(count<10))
  27   1                      PWM=1;
  28   1              else    PWM=0;  
  29   1              count++;        
  30   1              if(count==10)
  31   1              count=0x00;
  32   1              
  33   1      }
  34          
  35          
  36          void key_pwm(unsigned char x)//把鍵值轉(zhuǎn)化為PWM設(shè)置值
  37          {
  38   1              switch(x)                               //把矩陣鍵盤轉(zhuǎn)化為獨(dú)立鍵盤
  39   1              {
  40   2                      case 1:up=1;break;
  41   2                      case 2:down=1;break;
  42   2                      case 3:set_flag=!set_flag;break;
  43   2                      default:break;
  44   2              }
  45   1              
  46   1              if(up&&set_flag)                //設(shè)置PWM參數(shù):pwm_set
  47   1              {
  48   2                      pwm_set++;
  49   2                      up=0;
  50   2                      if(pwm_set>=10)
  51   2                      pwm_set=0x00;
  52   2              }
  53   1              if(down&&set_flag)
  54   1              {
  55   2                      pwm_set--;
C51 COMPILER V7.08   PWM                                                                   05/12/2007 17:30:02 PAGE 2   

  56   2                      down=0;
  57   2                      if(pwm_set==0xff)
  58   2                      pwm_set=9;
  59   2              }
  60   1              if(!set_flag)
  61   1              {
  62   2                      up=0;
  63   2                      down=0;
  64   2              }
  65   1      }
  66          
  67          
  68          void main(void)
  69          {
  70   1              TH2=0xb1;       //定時20MS
  71   1              TL2=0xe0;
  72   1              RCAP2H=0xb1;//定時器2溢出時會把這個單元的內(nèi)容送到TH2和TL2中
  73   1              RCAP2L=0xe0;
  74   1              EA=1;
  75   1              ET2=1;
  76   1              TR2=1;
  77   1              while(1)
  78   1              {
  79   2                      scan_full();    //看是否有鍵按下
  80   2                      if(key_ok)              //有鍵按下,則判斷到底是哪個鍵按下
  81   2                      {
  82   3                              key_value=key_scan();//鍵值送key_value暫存
  83   3                              P0=~BCD[key_value];      /*此三句是將鍵值顯示出來*/
  84   3                              P2=0xfe;                        /**                                              */
  85   3                              delay1(200);            /*************************/
  86   3                              key_pwm(key_value);  //調(diào)用鍵值轉(zhuǎn)PWM設(shè)置參數(shù)函數(shù)
  87   3                              key_value=0x00;          //清除鍵值,以免一次按下,多次響應(yīng)
  88   3                      }
  89   2                      P0=~BCD[pwm_set];               /***此三句是將pwm_set值顯示出來*/
  90   2                      P2=0xfd;                                /*******                                        */
  91   2                      delay1(200);                    /****************************/
  92   2              }
  93   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    187    ----
   CONSTANT SIZE    =     16    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =      3    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =      3    ----
END OF MODULE INFORMATION.


C51 COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)