实训第八天 ---------单片机LED、蜂鸣器、键盘

今日学习任务	了解51单片机的基本构成，会用编程来控制单片机各部件完成想要的一些操作
今日任务完成情况	今日任务基本完成，通过老师讲解了解了单片机的基本构成，并在老师的指导下通过编程仿真了解了如何实现一些简单功能。
今日开发问题汇总	sbit用来定义某一位，虽然放在程序较为靠前的地方，但末端的“；”不能忘记
今日未解决问题	个人单片机这一部分知识点学的不好，掌握程度不够，编写程序的时候有很多问题，需要重新多加练习编写代码。
今日开发收获	1.单片机的最小单元由电源电路、晶振电路、复位电路 2.定义某一位时用sbit，如：sbit LED = P1^0 3.矩阵按键分别通过P3.0~P3.7口来确定列和行从而确定哪个按键被按下
自我评价	基本能听懂老师所授内容，今天老师从最基本的讲起，让我觉得很多地方都有了不同的理解，受益匪浅
其他	#include <reg51.h> sbit Beep=P2^3; int key,i; /*unsigned char code    CharCode[]= {                0xc0, 0xf9, 0xa4,0xb0,0x99, 0x92,0x82,0xf8,          0x80, 0x90, 0x88, 0x83, 0xc6,0xa1,0x86,0x8e };      */ void delay(int x) {     while(x--)          {              for(i=0;i<200;i++);          } } int main() {          while (1)          {                   key = 0;                   Beep=1;                   P3 = 0xf0;//判断哪一列被按下                   if(P3 != 0xf0)                   {                           switch(P3)                           {                                    case 0xe0:        key = 0;    break;                                    case 0xd0:        key = 1;    break;                                    case 0xb0:        key = 2;    break;                                    case 0x70:        key = 3;    break;                           }                           P3 = 0x0f;//判断哪一行被按下                           switch(P3)                           {                                    case 0x0e:        key += 1;  break;                                    case 0x0d:        key += 5;  break;                                    case 0x0b:        key += 9;  break;                                    case 0x07:        key += 13;        break;                           }                   }                   switch (key)                   {                           case 1:                                    Beep=0;                                    delay(1);                                    break;                           case 2:                                    Beep = 0;                                    delay(20);                                    break;                           case 3:                                    Beep= 0;                                    delay(40);                                    break;                           case 4:                                    Beep = 0;                                    delay(80);                                    break;                           case 5:                                    Beep = 0;                                    delay(100);                                    break;                           case 6:                                    Beep= 0;                                    delay(120);                                    break;                           case 7:                                    Beep = 0;                                    delay(150);                                    break;                           case 8:                                    Beep = 0;                                    delay(180);                                    break;                   }          }          return 0; }