h19.c

51单片机程序C和汇编

#include <reg51.h>
#define LEDLen 6

xdata unsigned char OUTBIT _at_ 0x8002;   // 位控制口
xdata unsigned char OUTSEG _at_ 0x8004;   // 段控制口
xdata unsigned char IN     _at_ 0x8001;   // 键盘读入口

unsigned char LEDBuf[LEDLen];  // 显示缓冲
unsigned char RcvBuf;          // 接收缓冲
bit HasRcv = 0;                // 接收标志

code unsigned char LEDMAP[] = {  // 八段管显示码
  0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07,
  0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71
};

void SerialIO0() interrupt 4
{

  if(RI)
  {
    RI = 0;
    RcvBuf = SBUF;
    HasRcv = 1;
  }else
  {
    TI = 0;
  }
}

void Delay(unsigned char CNT)
{
  unsigned char i;

  while (CNT-- !=0)
    for (i=100; i !=0; i--);
}

void DisplayLED()
{
  unsigned char i, j;
  unsigned char Pos;
  unsigned char LED;

  Pos = 0x20;  // 从左边开始显示
  for (i = 0; i < LEDLen; i++) {
    OUTBIT = 0;     // 关所有八段管
    LED = LEDBuf[i];
    OUTSEG = LED;
    OUTBIT = Pos;  // 显示一位八段管
    Delay(1);
    Pos >>= 1;     // 显示下一位
  }
}

code unsigned char KeyTable[] = {   // 键码定义
  0x16, 0x15, 0x14, 0xff,
  0x13, 0x12, 0x11, 0x10,
  0x0d, 0x0c, 0x0b, 0x0a,
  0x0e, 0x03, 0x06, 0x09,
  0x0f, 0x02, 0x05, 0x08,
  0x00, 0x01, 0x04, 0x07
};

unsigned char TestKey()
{
   OUTBIT = 0;            // 输出线置为0
   return (~IN & 0x0f);   // 读入键状态 (高四位不用)
}

unsigned char GetKey()
{
  unsigned char Pos;
  unsigned char i;
  //unsigned char j;
  unsigned char k;

  i = 6;
  Pos = 0x20;     // 找出键所在列
  do {
    OUTBIT = ~ Pos;
    Pos >>= 1;
    k = ~IN & 0x0f;
  } while ((--i != 0) && (k == 0));

  // 键值 = 列 X 4 + 行
  if (k != 0) {
    i *= 4;
    if (k & 2)
      i += 1;
    else if (k & 4)
      i += 2;
    else if (k & 8)
      i += 3;

    OUTBIT = 0;
    do Delay(10); while (TestKey());  // 等键释放

    return(KeyTable[i]);  // 取出键码
  } else return(0xff);
}

void main()
{
    IE =   0x00;  // DISABLE ALL INTERRUPT
    TMOD = 0x20;  // 定时器1工作于方式2 (8位重装)
    TH1  = 0xF3;  // 2400BPS @ 12MHz
    TL1  = 0xF3;
    PCON&= 0x7F;  // SMOD 位清零
    SCON = 0x50;  // 串行口工作方式设置


   LEDBuf[0] = 0xff;
   LEDBuf[1] = 0xff;
   LEDBuf[2] = 0xff;
   LEDBuf[3] = 0xff;
   LEDBuf[4] = 0x00;
   LEDBuf[5] = 0x00;

   TR1 = 1;
   ES  = 1;
   EA  = 1;
   HasRcv = 0;

   while (1) {
     if(HasRcv){
       LEDBuf[5] = LEDMAP[RcvBuf & 0x0f];
     }
     DisplayLED();
     if (TestKey()) SBUF = GetKey();
   }
}