h26.c

51单片机程序C和汇编

#include <reg51.h>

#define LEDLen 6
#define PB1    2
#define PB0    1
#define mode   0x82

xdata unsigned char CTL  _at_ 0x8003;
xdata unsigned char PA   _at_ 0x8000; 

xdata unsigned char OUTBIT _at_ 0x9002;   // 位控制地址
xdata unsigned char OUTSEG _at_ 0x9004;   // 段控制地址
xdata unsigned char IN     _at_ 0x9001;

unsigned char LEDBuf[LEDLen];
code unsigned char LEDMAP[] = {
  0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07,
  0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71
};

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;

  // 初始位置为右边
  Pos = 0x20;
  for (i = 0; i < LEDLen; i++) {
    // 关闭所显示位
    OUTBIT = 0;
    // 取出显示数据
    LED = LEDBuf[i];
    OUTSEG = LED;
    // 输出位选通信号,选择一位LED点亮
    OUTBIT = Pos;
    // 延时
    Delay(1);
    // 移位,选择下一位LED准备点亮
    Pos >>= 1;
  }
  OUTBIT = 0;
}

code unsigned char KeyTable[] = {
  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()
{
   //输出列扫描信号
   OUTBIT = 0;
   //读入行信号
   return (~IN & 0x0f);
}

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

  // 共扫描6列
  i = 6;
  Pos = 0x20;
  do {
    // 输出列扫描信号
    OUTBIT = ~ Pos;
    // 移位,准备扫描下一列
    Pos >>= 1;
    // 读入行值
    k = ~IN & 0x0f;
  // 当6列扫描完或读到行值时,退出
  } while ((--i != 0) && (k == 0));

  //如果有键输入
  if (k != 0) {
    // 列值x4 + 行值 为键值
    i *= 4;
    if (k & 2)
      i += 1;
    else if (k & 4)
      i += 2;
    else if (k & 8)
      i += 3;

    OUTBIT = 0;
    // 等待按键松开
    do Delay(10); while (TestKey());
    // 根据键值查表得到键码,并返回键码
    return(KeyTable[i]);
  } else return(0xff);
}

/* =============================*/

#define UP     0x16
#define DOWN   0x15

#define LowLimit  10
#define HighLimit 30
#define LowTemp   (-40)   // A/D 0
#define HighTemp  50      // A/D 255
#define Heat 1
#define Cool 2

xdata unsigned char ADPort _at_ 0xa000;

signed char SetTemp, CurTemp;

void DisplayResult()
{
  signed char T;

  T = CurTemp;
  if (T < 0) {
    //如果温度低于零度,显示'-'号
    LEDBuf[0] = 0x40;
    T = - T;
  } else LEDBuf[0] = 0;
  //显示温度十位数
  LEDBuf[1] = LEDMAP[T / 10];
  //显示温度个位数
  LEDBuf[2] = LEDMAP[T % 10];

  LEDBuf[3] = 0;
  //后两位显示设定温度
  LEDBuf[4] = LEDMAP[SetTemp / 10];
  LEDBuf[5] = LEDMAP[SetTemp % 10];
}

unsigned char ReadAD()
{
  unsigned int i;

  // 启动A/D变换
  ADPort = 0;
  //延时100us,
  for (i=0; i<20; i++) ;
  //得到A/D采样值
  return (ADPort);
}

void ReadTemp()
{
  unsigned char i;
  signed int Temp;

  Temp = 0;
  //采样16次,取平均数
  for (i=0; i<16; i++) {
    Temp += ReadAD();
  };
  //AD采样值转换为实际温度
  CurTemp = (Temp/16) * (HighTemp-LowTemp) / 256 + LowTemp;
}


void main()
{
  unsigned char Key;
  
  CTL = mode;
  //初始设定温度为20
  SetTemp = 20;
  while (1) {
    while (!TestKey()) {
      // 当前温度和设定温度送显示缓冲
      DisplayResult();
      // 显示当前温度和设定温度
      DisplayLED();
      // 读入当前温度
      ReadTemp();
      // 如果当前温度低于设定温度2度
      // 则开动加热电机
      if (CurTemp < (SetTemp - 2)) {
        PA = Heat ;
      } else
      // 如果当前温度高于设定温度2度
      // 则开动致冷电机
      if (CurTemp > (SetTemp + 2)) {
        PA = Cool;
      } else {
      // 在设定温度+/- 2度内
      // 无需开动电机
        PA = 0;
      }
    }
    // 读键盘
    Key = GetKey();

    if (Key == DOWN) {
      // 设定温度向下调低
      if (SetTemp > LowLimit) SetTemp--;
    } else if (Key == UP) {
      // 设定温度向上调高

      if (SetTemp < HighLimit) SetTemp++;
    }
  }
}