首先声明：程序是从《手把手收教你学51单片机》而来，之所以在这里发帖，是想让更多的单片机高手评论一下这些程序写的到底如何
#include ***it KEY_IN_1 = P2^4; //矩阵按键的扫描输入引脚1 ***it KEY_IN_2 = P2^5; //矩阵按键的扫描输入引脚2 ***it KEY_IN_3 = P2^6; //矩阵按键的扫描输入引脚3 ***it KEY_IN_4 = P2^7; //矩阵按键的扫描输入引脚4 ***it KEY_OUT_1 = P2^3; //矩阵按键的扫描输出引脚1 ***it KEY_OUT_2 = P2^2; //矩阵按键的扫描输出引脚2 ***it KEY_OUT_3 = P2^1; //矩阵按键的扫描输出引脚3 ***it KEY_OUT_4 = P2^0; //矩阵按键的扫描输出引脚4 ***it ADDR0 = P1^0; ***it ADDR1 = P1^1; ***it ADDR2 = P1^2; ***it ADDR3 = P1^3; ***it ENLED = P1^4; unsigned char code LedChar[] = { 0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8, 0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8e }; //数码管真值表 const unsigned char code KeyCodeMap[4][4] = { //矩阵按键编号到PC 标准键盘键码的映射表 { '1', '2', '3', 0x26 }, //数字键1、数字键2、数字键3、向上键 { '4', '5', '6', 0x25 }, //数字键4、数字键5、数字键6、向左键 { '7', '8', '9', 0x28 }, //数字键7、数字键8、数字键9、向下键 { '0', 0x1B, 0x0D, 0x27 } //数字键0、ESC 键、回车键、向右键 }; unsigned char KeySta[4][4] = { //全部矩阵按键的当前状态 {1, 1, 1, 1}, {1, 1, 1, 1}, {1, 1, 1, 1}, {1, 1, 1, 1} }; //由于数组不能定义成bit 型，这里定义成unsigned char 型 unsigned char LedBuf[6] = { //数码管动态扫描显示缓冲区 0xC0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; //// 要这个显示缓冲区干嘛？？？？？ void DisplayNum(unsigned long num); void KeyAction(unsigned char keycode); void main(void) 0{ unsigned char i, j; unsigned char backup[4][4] = { //按键值备份，保存前一次的值 {1, 1, 1, 1}, {1, 1, 1, 1}, {1, 1, 1, 1}, {1, 1, 1, 1} }; //选择数码管进行显示 P0 = 0xFF; ADDR3 = 1; ENLED = 0; //配置T0 工作在模式1，定时1ms TMOD = 0x01; TH0 = 0xFC; TL0 = 0x67; TR0 = 1; ET0 = 1; EA = 1; while(1) 1{ //检索按键状态的变化 for (i=0; i<4; i++) 2{for (j=0; j<4; j++) 3{if (backup[j] != KeySta[j]) 4{if (backup[j] == 0) //按键弹起时执行动作 5{KeyAction(KeyCodeMap[j]);}5 backup[j] = KeySta[j];}4 }3 }2 }1 }0 void KeyAction(unsigned char keycode) { static unsigned long result = 0; //用于保存运算结果 static unsigned long addend = 0; //用于保存输入的加数 if ((keycode>='0') && (keycode<='9')) //输入0-9 的数字 {addend = (addend*10) + (keycode-'0'); //原数据扩大10 倍，由新输入的 字填充其个位 DisplayNum(addend); //运算结果显示到数码管 } else if (keycode == 0x26) //向上键用作加号，执行加法或连加运算 {result += addend; //进行加法运算 addend = 0; DisplayNum(result); //运算结果显示到数码管} else if (keycode == 0x0D) //回车键，执行加法运算（实际效果与加号并无区 别）{ result += addend; //进行加法运算 addend = 0; DisplayNum(result); //运算结果显示到数码管 } else if (keycode == 0x1B) //Esc 键，清零结果 {addend = 0; result = 0; DisplayNum(addend); //清零后的加数显示到数码管} } void DisplayNum(unsigned long num) { signed char i; unsigned char buf[6]; for (i=0; i<6; i++) //把长整型数转换为6 位十进制的数组 {buf = num % 10; num /= 10; } for (i=5; i>=1; i--) //从最高位起，遇到0 即转换为空格，遇到非0 即退出 {if (buf == 0) {LedBuf = 0xFF;} else {break;} } for ( ; i>=0; i--) //剩余低位都如实转换为数字 {LedBuf = LedChar[buf];} } void InterruptTimer0() interrupt 1 { unsigned char i; static unsigned char ledcnt = 0; //数码管扫描计数器 static unsigned char keyout = 0; //矩阵按键扫描输出计数器 static unsigned char keybuf[4][4] = { //按键扫描缓冲区，保存一段时间内的扫描值 {0xFF, 0xFF, 0xFF, 0xFF}, {0xFF, 0xFF, 0xFF, 0xFF}, {0xFF, 0xFF, 0xFF, 0xFF}, {0xFF, 0xFF, 0xFF, 0xFF}}; TH0 = 0xFC; //溢出后进入中断重新赋值 TL0 = 0x67; //将一行的4 个按键值移入缓冲区 keybuf[keyout][0] = (keybuf[keyout][0] << 1) | KEY_IN_1; keybuf[keyout][1] = (keybuf[keyout][1] << 1) | KEY_IN_2; keybuf[keyout][2] = (keybuf[keyout][2] << 1) | KEY_IN_3; keybuf[keyout][3] = (keybuf[keyout][3] << 1) | KEY_IN_4; //消抖后更新按键状态 for (i=0; i<4; i++) //每行4 个按键，所以循环4 次 { if ((keybuf[keyout] & 0x0F) == 0x00) { //连续4 次扫描值为0，即16ms(4*4ms)内都只检测到按下状态时，可认为 按键已按下KeySta[keyout] = 0;} else if ((keybuf[keyout] & 0x0F) == 0x0F) { //连续4 次扫描值为1，即16ms(4*4ms)内都只检测到弹起状态时，可认为 按键已弹起KeySta[keyout] = 1;} } //执行下一次的扫描输出 keyout++; keyout &= 0x03; switch (keyout) {case 0: KEY_OUT_4 = 1; KEY_OUT_1 = 0; break; case 1: KEY_OUT_1 = 1; KEY_OUT_2 = 0; break; case 2: KEY_OUT_2 = 1; KEY_OUT_3 = 0; break; case 3: KEY_OUT_3 = 1; KEY_OUT_4 = 0; break; default: break; } //执行数码管动态扫描显示 P0 = 0xFF; switch (ledcnt) { case 0: ADDR0=0; ADDR1=0; ADDR2=0; break; case 1: ADDR0=1; ADDR1=0; ADDR2=0; break; case 2: ADDR0=0; ADDR1=1; ADDR2=0; break; case 3: ADDR0=1; ADDR1=1; ADDR2=0; break; case 4: ADDR0=0; ADDR1=0; ADDR2=1; break; case 5: ADDR0=1; ADDR1=0; ADDR2=1; break; default: break; } P0 = LedBuf[ledcnt]; ledcnt++; if (ledcnt >= 6) { ledcnt = 0; } }
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