- #include<reg52.h>
- sbit KEY_IN_1 = P2^4;
- sbit KEY_IN_2 = P2^5;
- sbit KEY_IN_3 = P2^6;
- sbit KEY_IN_4 = P2^7;
- sbit KEY_OUT_1 = P2^3;
- sbit KEY_OUT_2 = P2^2;
- sbit KEY_OUT_3 = P2^1;
- sbit KEY_OUT_4 = P2^0;
- signed long beats = 0;
- unsigned char KeySta[4][4] = {
- {1,1,1,1},{1,1,1,1},{1,1,1,1},{1,1,1,1}
- };
- unsigned char code KeyCodeMap[4][4] = { //矩阵按键编号到标准键盘键码的映射表
- { 0x31, 0x32, 0x33, 0x26 }, //数字键1、数字键2、数字键3、向上键
- { 0x34, 0x35, 0x36, 0x25 }, //数字键4、数字键5、数字键6、向左键
- { 0x37, 0x38, 0x39, 0x28 }, //数字键7、数字键8、数字键9、向下键
- { 0x30, 0x1B, 0x0D, 0x27 } //数字键0、ESC键、 回车键、 向右键
- };
- void KeyDriver();
- void main()
- {
- EA = 1; //使能总中断
- TMOD = 0x01; //设置T0为模式1
- TH0 = 0xFC; //为T0赋初值0xFC67,定时1ms
- TL0 = 0x67;
- ET0 = 1; //使能T0中断
- TR0 = 1; //启动T0
-
- while (1)
- {
- KeyDriver(); //调用按键驱动函数
- }
- }
- void StartMotor(signed long angle)
- {
- EA = 0;
- beats = (angle*4076)/360;
- EA = 1;
- }
- void StopMotor()
- {
- EA = 0;
- beats = 0;
- EA = 1;
- }
- void KeyAction(unsigned char keycode)
- {
- static bit dirMotor = 0;
-
- if((keycode >= 0x30) &&(keycode <= 0x39))
- {
- if(dirMotor == 0)
- {
- StartMotor(360 * (keycode - 0x30));
- }
- else
- {
- StartMotor(-360 * (keycode - 0x30));
- }
- }
-
- else if(keycode == 0x26)
- {
- dirMotor = 0;
- }
- else if(keycode == 0x28)
- {
- dirMotor = 1;
- }
- else if(keycode == 0x25)
- {
- StartMotor(90);
- }
- else if(keycode == 0x27)
- {
- StartMotor(-90);
- }
- else if(keycode == 0x1B)
- {
- StopMotor();
- }
-
- }
- void KeyDriver()
- {
- unsigned char i, j;
- static unsigned char backup [4][4] = {
- {1,1,1,1},{1,1,1,1},{1,1,1,1},{1,1,1,1}
- };
- for(i=0; i<4; i++)
- {
- for(j=0; j<4; j++)
- {
- if(backup[i][j] != KeySta[i][j])
- {
- if(backup[i][j] == 0)
- {
- KeyAction(KeyCodeMap[i][j]);
- }
- backup[i][j] = KeySta[i][j];
- }
- }
- }
-
- }
- /* 按键扫描函数,需在定时中断中调用,推荐调用间隔1ms */
- void KeyScan()
- {
- unsigned char i;
- static unsigned char keyout = 0; //矩阵按键扫描输出索引
- static unsigned char keybuf[4][4] = { //矩阵按键扫描缓冲区
- {0xFF, 0xFF, 0xFF, 0xFF}, {0xFF, 0xFF, 0xFF, 0xFF},
- {0xFF, 0xFF, 0xFF, 0xFF}, {0xFF, 0xFF, 0xFF, 0xFF}
- };
- //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][i] & 0x0F) == 0x00)
- { //连续4次扫描值为0,即4*4ms内都是按下状态时,可认为按键已稳定的按下
- KeySta[keyout][i] = 0;
- }
- else if ((keybuf[keyout][i] & 0x0F) == 0x0F)
- { //连续4次扫描值为1,即4*4ms内都是弹起状态时,可认为按键已稳定的弹起
- KeySta[keyout][i] = 1;
- }
- }
- //执行下一次的扫描输出
- keyout++; //输出索引递增
- keyout = keyout & 0x03; //索引值加到4即归零
- switch (keyout) //根据索引,释放当前输出引脚,拉低下次的输出引脚
- {
- 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;
- }
- }
- void TurnMotor()
- {
- unsigned char tmp;
- static unsigned char index = 0;
- unsigned char code BeatCode[8] = {
- 0x0E, 0x0C, 0x0D, 0x09, 0x0B, 0x03, 0x07, 0x06};
- if(beats != 0)
- {
- if(beats > 0)
- {
- index++;
- index = index & 0x07;
- beats--;
- }
- else
- {
- index--;
- index = index & 0x07;
- beats++;
- }
- tmp = P1;
- tmp = tmp & 0xF0;
- tmp = tmp | BeatCode[index];
- P1 = tmp;
- }
- else
- {
- P1 = P1 | 0x0F;
- }
- }
- /* T0中断服务函数,用于数码管显示扫描与按键扫描 */
- void InterruptTimer0() interrupt 1
- {
- static bit div = 0;
- TH0 = 0xFC;
- TL0 = 0x67;
- KeyScan();
- div = ~ div;
- if(div == 1)
- {
- TurnMotor();
- }
- }
- #include
- sbit ADDR0 = P1^0;
- sbit ADDR1 = P1^1;
- sbit ADDR2 = P1^2;
- sbit ADDR3 = P1^3;
- sbit ENLED = P1^4;
- unsigned char code LedChar[] = { //数码管显示字符转换表
- 0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8,
- 0x80, 0x90, 0x88, 0x83, 0xC6, 0xA1, 0x86, 0x8E
- };
- unsigned char LedBuff[6] = { //数码管显示缓冲区,初值 0xFF 确保启动时都不亮
- 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
- };
- void SecondCount();
- void LedRefresh();
- void main(){
- ENLED = 0; //使能 U3,选择控制数码管
- ADDR3 = 1; //因为需要动态改变 ADDR0-2 的值,所以不需要再初始化了
- TMOD = 0x01; //设置 T0 为模式 1
- TH0 = 0xFC; //为 T0 赋初值 0xFC67,定时 1ms
- TL0 = 0x67;
- TR0 = 1; //启动 T0
- while (1){
- if (TF0 == 1){ //判断 T0 是否溢出
- TF0 = 0; //T0 溢出后,清零中断标志
- TH0 = 0xFC; //并重新赋初值
- TL0 = 0x67;
- SecondCount(); //调用秒计数函数
- LedRefresh(); //调用显示刷新函数
- }
- }
- }
- /* 秒计数函数,每秒进行一次秒数+1,并转换为数码管显示字符 */
- void SecondCount(){
- static unsigned int cnt = 0; //记录 T0 中断次数
- static unsigned long sec = 0; //记录经过的秒数
- cnt++; //计数值自加 1
- if (cnt >= 1000){ //判断 T0 溢出是否达到 1000 次
- cnt = 0; //达到 1000 次后计数值清零
- sec++; //秒计数自加 1
-
- LedBuff[0] = LedChar[sec%10];
- LedBuff[1] = LedChar[sec/10%10];
- LedBuff[2] = LedChar[sec/100%10];
- LedBuff[3] = LedChar[sec/1000%10];
- LedBuff[4] = LedChar[sec/10000%10];
- LedBuff[5] = LedChar[sec/100000%10];
- }
- }
- /* 数码管动态扫描刷新函数 */
- void LedRefresh(){
- static unsigned char i = 0; //动态扫描的索引
- switch (i){
- case 0: ADDR2=0; ADDR1=0; ADDR0=0; i++; P0=LedBuff[0]; break;
- case 1: ADDR2=0; ADDR1=0; ADDR0=1; i++; P0=LedBuff[1]; break;
- case 2: ADDR2=0; ADDR1=1; ADDR0=0; i++; P0=LedBuff[2]; break;
- case 3: ADDR2=0; ADDR1=1; ADDR0=1; i++; P0=LedBuff[3]; break;
- case 4: ADDR2=1; ADDR1=0; ADDR0=0; i++; P0=LedBuff[4]; break;
- case 5: ADDR2=1; ADDR1=0; ADDR0=1; i=0; P0=LedBuff[5]; break;
- default: break;
- }
- }
这里有两个程序,一个是在main()里只调用了一个KeyDriver()函数,另一个是在main()调用SecondCount()和LedRefresh()函数,我想问一下为什么第一个程序没有像第二个程序那样子写直接在main里面调用函数,而是在函数里面调用函数。我应该怎么去理解第一个程序,难道要跟着他的函数思路跳来跳去?例如第一个是KeyDriver函数,然后到backup--->Keysta--->KeyCodeMap---->然后呢?我没找到去哪个函数了。这样子怎么办,各位是如何处理这样子的问题的?我应该怎么理解这样子的程序?如果跟着函数跳来跳去的话,代码量一多起来的话脑袋都绕晕了还怎么理解程序?