c/c++语言开发共享单片机三个引脚控制16路流水灯

我们先来看下最终的效果

我们先用单片机按照74hc595手动分解的例子，来实现我们想要的结果。
首先，我们让16个led灯交叉亮起来

代码部分：

int stcp_pin = 4; int shcp_pin = 6; int ds_pin = 5;    void setup () {   pinmode(stcp_pin,output);   pinmode(shcp_pin,output);   pinmode(ds_pin,output);  }  // 我们先让16个灯交叉亮 void loop() {   while(1)   {     digitalwrite(stcp_pin, low);          // 1     digitalwrite(shcp_pin, low);     digitalwrite(ds_pin, low);     digitalwrite(shcp_pin, high);     // 2     digitalwrite(shcp_pin, low);     digitalwrite(ds_pin, high);     digitalwrite(shcp_pin, high);     // 3     digitalwrite(shcp_pin, low);     digitalwrite(ds_pin, low);     digitalwrite(shcp_pin, high);     // 4     digitalwrite(shcp_pin, low);     digitalwrite(ds_pin, high);     digitalwrite(shcp_pin, high);     // 5     digitalwrite(shcp_pin, low);     digitalwrite(ds_pin, low);     digitalwrite(shcp_pin, high);     // 6     digitalwrite(shcp_pin, low);     digitalwrite(ds_pin, high);     digitalwrite(shcp_pin, high);          // 7     digitalwrite(shcp_pin, low);     digitalwrite(ds_pin, low);     digitalwrite(shcp_pin, high);     // 8     digitalwrite(shcp_pin, low);     digitalwrite(ds_pin, high);     digitalwrite(shcp_pin, high);     // 9     digitalwrite(shcp_pin, low);     digitalwrite(ds_pin, low);     digitalwrite(shcp_pin, high);     // 10     digitalwrite(shcp_pin, low);     digitalwrite(ds_pin, high);     digitalwrite(shcp_pin, high);     // 11     digitalwrite(shcp_pin, low);     digitalwrite(ds_pin, low);     digitalwrite(shcp_pin, high);     // 12     digitalwrite(shcp_pin, low);     digitalwrite(ds_pin, high);     digitalwrite(shcp_pin, high);          // 13     digitalwrite(shcp_pin, low);     digitalwrite(ds_pin, low);     digitalwrite(shcp_pin, high);     // 14     digitalwrite(shcp_pin, low);     digitalwrite(ds_pin, high);     digitalwrite(shcp_pin, high);     // 15     digitalwrite(shcp_pin, low);     digitalwrite(ds_pin, low);     digitalwrite(shcp_pin, high);     // 16     digitalwrite(shcp_pin, low);     digitalwrite(ds_pin, high);     digitalwrite(shcp_pin, high);          digitalwrite(stcp_pin, high);       } } 

运行效果

然后我们再把代码简化一下，使其看起来更简洁，实用

int stcp_pin = 4; int shcp_pin = 6; int ds_pin = 5;    void setup () {   pinmode(stcp_pin,output);   pinmode(shcp_pin,output);   pinmode(ds_pin,output);       digitalwrite(stcp_pin, low); }  void loop() {   unsigned char led_data;      while(1)   {            led_data = 0xaa;       // 第一个8位       digitalwrite(stcp_pin, low);        for(int i=0; i<8; i++)       {         if(led_data&0x80){ digitalwrite(ds_pin, high);}         else             { digitalwrite(ds_pin, low); }          digitalwrite(shcp_pin, low);         digitalwrite(shcp_pin, high);         led_data <<=1;       }             // 第二个8位       led_data = 0xaa;       for(int i=0; i<8; i++)       {         if(led_data&0x80){ digitalwrite(ds_pin, high);}         else             { digitalwrite(ds_pin, low); }          digitalwrite(shcp_pin, low);         digitalwrite(shcp_pin, high);         led_data <<=1;       }         digitalwrite(stcp_pin, high);       delay(1000);   } } 

我们稍微改变下，让led灯按照我们的意思工作，封装一下函数，然后让中间四个灯亮起来

int stcp_pin = 4; int shcp_pin = 6; int ds_pin = 5;   void hc595_write(unsigned char data1, unsigned char data2);  void setup () {   pinmode(stcp_pin,output);   pinmode(shcp_pin,output);   pinmode(ds_pin,output);   }  void loop() {   unsigned char led_data1 = 0x03;   unsigned char led_data2 = 0xc0;   while(1)   {     hc595_write(led_data1, led_data2);     delay(1000);   } }  void hc595_write(unsigned char data1, unsigned char data2) {              // 第一个8位       digitalwrite(stcp_pin, low);        for(int i=0; i<8; i++)       {         if(data1&0x80){ digitalwrite(ds_pin, high);}         else             { digitalwrite(ds_pin, low); }          digitalwrite(shcp_pin, low);         digitalwrite(shcp_pin, high);         data1 <<=1;       }             // 第二个8位       for(int i=0; i<8; i++)       {         if(data2&0x80){ digitalwrite(ds_pin, high);}         else             { digitalwrite(ds_pin, low); }          digitalwrite(shcp_pin, low);         digitalwrite(shcp_pin, high);         data2 <<=1;       }         digitalwrite(stcp_pin, high);  }  

中间四个led灯亮的效果

然后我们连贯起来搞个流水的灯玩玩

int stcp_pin = 4; int shcp_pin = 6; int ds_pin = 5;   unsigned char led_data1[8] = { 0x01, 0x02, 0x04, 0x08,                                0x10, 0x20, 0x40, 0x80}; unsigned char led_data2[8] = { 0x01, 0x02, 0x04, 0x08,                                0x10, 0x20, 0x40, 0x80};  void hc595_write(unsigned char data1, unsigned char data2);  void setup () {   pinmode(stcp_pin,output);   pinmode(shcp_pin,output);   pinmode(ds_pin,output);   }  void loop() {    while(1)   {     for(int i=0; i<8; i++)     {         hc595_write(0x00, led_data1[i]);         delay(1000);     }          for(int i=0; i<8; i++)     {         hc595_write( led_data2[i], 0x00);         delay(1000);     }   } }  void hc595_write(unsigned char data1, unsigned char data2) {              // 第一个8位       digitalwrite(stcp_pin, low);        for(int i=0; i<8; i++)       {         if(data1&0x80){ digitalwrite(ds_pin, high);}         else             { digitalwrite(ds_pin, low); }          digitalwrite(shcp_pin, low);         digitalwrite(shcp_pin, high);         data1 <<=1;       }             // 第二个8位       for(int i=0; i<8; i++)       {         if(data2&0x80){ digitalwrite(ds_pin, high);}         else             { digitalwrite(ds_pin, low); }          digitalwrite(shcp_pin, low);         digitalwrite(shcp_pin, high);         data2 <<=1;       }         digitalwrite(stcp_pin, high);  }  

最终的流水灯实验效果


当然arduino本身自带了移位函数，同样可以达到效果

 int stcp_pin = 4; int shcp_pin = 6; int ds_pin = 5;   unsigned char led_data1[8] = { 0x01, 0x02, 0x04, 0x08,                                0x10, 0x20, 0x40, 0x80}; unsigned char led_data2[8] = { 0x01, 0x02, 0x04, 0x08,                                0x10, 0x20, 0x40, 0x80};  void setup () {   pinmode(stcp_pin,output);   pinmode(shcp_pin,output);   pinmode(ds_pin,output);  } void loop() {   for(int a=0; a<8; a++)      {     digitalwrite(stcp_pin,low);      shiftout(ds_pin,shcp_pin,msbfirst,led_data1[a]);     shiftout(ds_pin,shcp_pin,msbfirst,0x00);     digitalwrite(stcp_pin,high);      delay(500);    }      for(int a=0; a<8; a++)      {     digitalwrite(stcp_pin,low);      shiftout(ds_pin,shcp_pin,msbfirst,0x00);     shiftout(ds_pin,shcp_pin,msbfirst,led_data2[a]);     digitalwrite(stcp_pin,high);      delay(500);    } }  

流水的延时500ms的效果

总结：

1、复杂的功能，深入分解后背后的原理其实还是挺简单的；

2、我们绝大部分时候都在造“轮子“，殊不知更优秀的“轮子”已经造好了；知晓“轮子”的由来，然后造出更优秀的“轮子”给自己用也是单片机学习路上的一项重要技能。

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