ex4-6.lst

这 个 范 例 说 明 如 何 使 用 按 钮 输 入 数 据 .

C51 COMPILER V8.05a   EX4_6                                                                08/22/2008 14:44:51 PAGE 1   


C51 COMPILER V8.05a, COMPILATION OF MODULE EX4_6
OBJECT MODULE PLACED IN ex4-6.OBJ
COMPILER INVOKED BY: d:\Keil\C51\BIN\C51.EXE ex4-6.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          /*
   2          标题：范例 4-6
   3          版本：1.0
   4          Target：89S51
   5          程序描述：这个范例说明如何使用按钮输入数据 */
   6          /* ***************************************************** */
   7          #include <REGX51.H>
   8          #define TRUE    1
   9          #define FALSE   0
  10          const 
  11          seven_seg[10]={0XC0,0XF9,0XA4,0XB0,0X99,0X92,0X82,0XF8,0X80,
  12          0X90};
  13          void delay (void)  {    /* wait function */
  14   1        unsigned char i,j;    /* only to delay for LED flashes */
  15   1           for (i=0;i<96;i++)
  16   1                for(j=0;j<255;j++)
  17   1                ;
  18   1      }
  19          //
  20          // 函数 keypressed 检查是否有按键按下 
  21          //
  22          int keypressed()
  23          {
  24   1              do {
  25   2                  while (P2_0==1);
  26   2                  delay();
  27   2                  if(P2_0==0) {
  28   3                       delay();
  29   3                       if (P2_0==0)
  30   3                       return TRUE;
  31   3                   }
  32   2              } while(1);
  33   1      }
  34          void main (void)  
  35          {
  36   1        int c;
  37   1        P1=seven_seg[c];
  38   1        do {
  39   2            if ( keypressed() ) c++;
  40   2            if(c==10) c=0;
  41   2            P1=seven_seg[c];
  42   2        }   while(1);
  43   1      }
  44          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     75    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =     20    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.

C51 COMPILER V8.05a   EX4_6                                                                08/22/2008 14:44:51 PAGE 2   


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