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»论坛 › 嵌入式/单片机论坛 › 24小时必答区 › 这个单片机st7920液晶程序里面Write_Data(00);的作用?
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这个单片机st7920液晶程序里面Write_Data(00);的作用?

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ID:721008 发表于 2020-9-16 17:24 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
此程序是一个开发板（51单片机的12684显示）的教程程序，void DisplayCGRAM(unsigned char x,unsigned char y)这个函数是如何对void CGRAM()函数进行显示的，Display是一个关键字吗？还有Write_Data(00);这条语句的作用是什么？如何去理解？
求大神解答，谢谢。
  1. /*-----------------------------------------------
  2.   名称：st7920字库液晶显示
  3.   修改：无
  4.   内容：通过显示字符、数字、汉字和图片测试液晶基本功能
  5. ------------------------------------------------*/
  6. #include <reg52.h>
  7. #include <intrins.h>
  8. #include "delay.h"

  10. sbit RS = P2^4;
  11. sbit RW = P2^5;
  12. sbit E  = P2^6;
  13. sbit RES = P2^3;
  14. sbit PSB = P2^1;
  15. sbit PAUSE = P3^0;

  17. #define DataPort P0        //MCU P0<------> LCM



  21. unsigned char code user16x16[]={ //笑脸图片
  22. 0x0F,0xF0,0x10,0x08,0x20,0x04,0x40,0x02,0x9C,0x39,0xBE,0x7D,0x80,0x01,0x80,0x01,
  23. 0x80,0x01,0x88,0x11,0x84,0x21,0x43,0xC2,0x20,0x04,0x10,0x08,0x0F,0xF0,0x00,0x00,
  24. };
  25. unsigned char code pic1[]=      // 图片代码
  26. {
  27. 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
  28. 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
  29. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  30. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  31. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  32. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  33. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  34. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  35. 0xC0,0x1F,0xFF,0x81,0xFF,0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  36. 0xC0,0x1F,0xFF,0x81,0xFF,0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  37. 0xC0,0x18,0x01,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x20,0x08,0x00,0x00,0x00,0x03,
  38. 0xC0,0x1F,0xFF,0x80,0x00,0x00,0x04,0x07,0x81,0xE0,0x10,0x10,0x03,0xC0,0x30,0x03,
  39. 0xC0,0x1F,0xFF,0x80,0x00,0x00,0x0C,0x0C,0xC3,0x30,0x08,0x20,0x0C,0xE0,0x70,0x03,
  40. 0xC0,0x18,0x01,0x87,0xFF,0xFE,0x3C,0x18,0x66,0x18,0x04,0x40,0x0C,0x60,0x70,0x03,
  41. 0xC0,0x1F,0xFF,0x87,0xFF,0xFE,0x0C,0x18,0x66,0x18,0x02,0x80,0x18,0x00,0xB0,0x03,
  42. 0xC0,0x1F,0xFF,0x80,0x06,0x00,0x0C,0x18,0x66,0x18,0x01,0x00,0x1B,0x81,0x30,0x03,
  43. 0xC0,0x01,0x98,0x00,0x06,0x00,0x0C,0x00,0xE3,0x30,0x02,0x80,0x1C,0xC1,0x30,0x03,
  44. 0xC0,0x19,0x99,0x80,0x66,0x60,0x0C,0x00,0xC1,0xE0,0x04,0x40,0x18,0x62,0x30,0x03,
  45. 0xC0,0x19,0x99,0x80,0x66,0x30,0x0C,0x01,0x83,0x30,0x08,0x20,0x18,0x66,0x30,0x03,
  46. 0xC0,0x0D,0x9B,0x00,0xC6,0x38,0x0C,0x03,0x06,0x18,0x10,0x10,0x18,0x67,0xFC,0x03,
  47. 0xC0,0x0D,0x9B,0x01,0xC6,0x1C,0x0C,0x06,0x06,0x18,0x20,0x08,0x18,0x60,0x30,0x03,
  48. 0xC0,0x01,0x98,0x03,0x86,0x0C,0x0C,0x0C,0x06,0x18,0x00,0x00,0x08,0x60,0x30,0x03,
  49. 0xC0,0x7F,0xFF,0xE3,0x06,0x00,0x0C,0x18,0x03,0x30,0x00,0x00,0x0C,0xC0,0x30,0x03,
  50. 0xC0,0x7F,0xFF,0xE0,0x1E,0x00,0x0C,0x1F,0xE1,0xE0,0x00,0x00,0x07,0x80,0x30,0x03,
  51. 0xC0,0x00,0x00,0x00,0x1C,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  52. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  53. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  54. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  55. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  56. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  57. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  58. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  59. 0xC0,0x00,0x00,0x00,0x00,0x00,0x0C,0x00,0x00,0x18,0x00,0x00,0x00,0x06,0x0C,0x03,
  60. 0xC3,0xFF,0xFC,0x3F,0xF0,0x80,0x0C,0x00,0x3F,0x18,0x01,0xFF,0xFE,0x06,0x0C,0x03,
  61. 0xC3,0xFF,0xFC,0x3F,0xF1,0x80,0x0F,0xFC,0x3F,0x18,0x01,0xFF,0xFE,0x06,0x0C,0x03,
  62. 0xC3,0x0C,0x0C,0x0C,0xC3,0x00,0x0F,0xFC,0x33,0x7F,0xE1,0x86,0x06,0x06,0x0C,0x03,
  63. 0xC3,0x1F,0xCC,0x0C,0xC6,0x00,0x0C,0x00,0x33,0x7F,0xE1,0x8F,0xE6,0x06,0x0C,0x03,
  64. 0xC3,0x3F,0xCC,0x0C,0xCC,0x00,0x0C,0x00,0x36,0x30,0x01,0x9F,0xE6,0x07,0xFF,0xE3,
  65. 0xC3,0x79,0x8C,0x0C,0xC8,0x00,0xFF,0xF0,0x36,0x36,0x01,0xBC,0xC6,0x07,0xFF,0xE3,
  66. 0xC3,0x6F,0x0C,0x7F,0xF0,0xC0,0xFF,0xF0,0x36,0x66,0x01,0xB7,0x86,0x06,0x00,0x03,
  67. 0xC3,0x0F,0x0C,0x7F,0xF1,0x80,0xC0,0x30,0x36,0x7F,0xC1,0x87,0x86,0x06,0x00,0x03,
  68. 0xC3,0x79,0xEC,0x0C,0xC3,0x00,0xC0,0x30,0x33,0x7F,0xC1,0xBC,0xF6,0x06,0x00,0x03,
  69. 0xC3,0x76,0xEC,0x0C,0xC6,0x00,0xC0,0x30,0x33,0x06,0x01,0xBB,0x76,0x07,0xFF,0x03,
  70. 0xC3,0x07,0x0C,0x0C,0xCC,0x20,0xFF,0xF0,0x33,0x06,0x01,0x83,0x86,0x07,0xFF,0x03,
  71. 0xC3,0x03,0x0C,0x18,0xC8,0x60,0xFF,0xF0,0x3F,0x06,0x01,0x81,0x86,0x06,0x03,0x03,
  72. 0xC3,0x1C,0x0C,0x18,0xC0,0xC0,0x00,0x00,0x3E,0xFF,0xE1,0x8E,0x06,0x06,0x03,0x03,
  73. 0xC3,0x1F,0x0C,0x18,0xC1,0x81,0xB1,0x8C,0x30,0xFF,0xE1,0x8F,0x86,0x06,0x03,0x03,
  74. 0xC3,0x03,0x0C,0x30,0xC7,0x01,0xB1,0x8C,0x30,0x06,0x01,0x81,0x86,0x0C,0x03,0x03,
  75. 0xC3,0xFF,0xFC,0x70,0xDE,0x03,0x18,0xC6,0x30,0x06,0x01,0xFF,0xFE,0x0C,0x03,0x03,
  76. 0xC3,0xFF,0xFC,0x20,0x18,0x03,0x18,0xC6,0x30,0x06,0x01,0xFF,0xFE,0x18,0x03,0x03,
  77. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  78. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  79. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  80. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  81. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  82. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  83. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  84. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  85. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  86. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  87. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  88. 0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
  89. 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
  90. 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,

  92. };

  94. /*------------------------------------------------
  95.                     检测忙位
  96. ------------------------------------------------*/
  97. void Check_Busy()
  98. {  
  99.     RS=0;
  100.     RW=1;
  101.     E=1;
  102.     DataPort=0xff;
  103.     while((DataPort&0x80)==0x80);//忙则等待
  104.     E=0;
  105. }
  106. /*------------------------------------------------
  107.                    写命令
  108. ------------------------------------------------*/
  109. void Write_Cmd(unsigned char Cmd)
  110. {
  111.         Check_Busy();
  112.         RS=0;
  113.         RW=0;
  114.         E=1;
  115.         DataPort=Cmd;
  116.         DelayUs2x(5);
  117.         E=0;
  118.         DelayUs2x(5);
  119. }
  120. /*------------------------------------------------
  121.                     写数据
  122. ------------------------------------------------*/
  123. void Write_Data(unsigned char Data)
  124. {
  125.         Check_Busy();
  126.         RS=1;
  127.         RW=0;
  128.         E=1;
  129.         DataPort=Data;
  130.         DelayUs2x(5);
  131.         E=0;
  132.         DelayUs2x(5);
  133. }
  134. /*------------------------------------------------
  135.                    液晶屏初始化
  136. ------------------------------------------------*/
  137. void Init_ST7920()
  138. {  
  139.    DelayMs(40);           //大于40MS的延时程序
  140.    PSB=1;                 //设置为8BIT并口工作模式
  141.    DelayMs(1);            //延时
  142.    RES=0;                 //复位
  143.    DelayMs(1);            //延时
  144.    RES=1;                 //复位置高
  145.    DelayMs(10);
  146.    Write_Cmd(0x30);       //选择基本指令集
  147.    DelayUs2x(50);         //延时大于100us
  148.    Write_Cmd(0x30);       //选择8bit数据流
  149.    DelayUs2x(20);         //延时大于37us
  150.    Write_Cmd(0x0c);       //开显示(无游标、不反白)
  151.    DelayUs2x(50);         //延时大于100us
  152.    Write_Cmd(0x01);       //清除显示，并且设定地址指针为00H
  153.    DelayMs(15);           //延时大于10ms
  154.    Write_Cmd(0x06);       //指定在资料的读取及写入时，设定游标的移动方向及指定显示的移位，光标从右向左加1位移动
  155.    DelayUs2x(50);         //延时大于100us
  156. }
  157. /*------------------------------------------------
  158.                    用户自定义字符
  159. ------------------------------------------------*/
  160. void CGRAM()
  161. {
  162.      int i;
  163.      Write_Cmd(0x30);
  164.      Write_Cmd(0x40);
  165.      for(i=0;i<16;i++)
  166.        {
  167.             Write_Data(user16x16[i*2]);
  168.         Write_Data(user16x16[i*2+1]);
  169.       }
  170. }   
  171. /*------------------------------------------------
  172.                    显示用户自定义字符
  173. ------------------------------------------------*/
  174. void DisplayCGRAM(unsigned char x,unsigned char y)
  175. {
  176. switch(y)
  177.      {
  178.           case 1: Write_Cmd(0x80+x);break;
  179.           case 2: Write_Cmd(0x90+x);break;
  180.           case 3: Write_Cmd(0x88+x);break;
  181.           case 4: Write_Cmd(0x98+x);break;
  182.       default:break;
  183.          }
  184.     Write_Data(00);
  185.     Write_Data(00);

  187. }         
  188. /*------------------------------------------------
  189.                    显示字符串
  190. x:横坐标值，范围0~8
  191. y:纵坐标值，范围1~4
  192. ------------------------------------------------*/
  193. void LCD_PutString(unsigned char x,unsigned char y,unsigned char code *s)
  194. {
  195. switch(y)
  196.      {
  197.           case 1: Write_Cmd(0x80+x);break;
  198.           case 2: Write_Cmd(0x90+x);break;
  199.           case 3: Write_Cmd(0x88+x);break;
  200.           case 4: Write_Cmd(0x98+x);break;
  201.       default:break;
  202.          }
  203. while(*s>0)
  204.    {
  205.       Write_Data(*s);
  206.       s++;
  207.       DelayUs2x(50);
  208.    }
  209. }
  210. /*------------------------------------------------
  211.                       清屏
  212. ------------------------------------------------*/
  213. void ClrScreen()
  214. {
  215.    Write_Cmd(0x01);
  216.    DelayMs(15);
  217. }
  218.          
  219. /*------------------------------------------------
  220.                    显示图片
  221. ------------------------------------------------*/
  222. void LCD_PutGraphic(unsigned char code *img)
  223. {
  224. int i,j;
  225. //显示上半屏内容设置
  226.    for(i=0;i<32;i++)            
  227.     {
  228.       Write_Cmd(0x80 + i); //SET  垂直地址 VERTICAL ADD
  229.       Write_Cmd(0x80);     //SET  水平地址 HORIZONTAL ADD
  230.       for(j=0;j<16;j++)
  231.        {
  232.          Write_Data(*img);
  233.          img++;
  234.        }
  235.     }
  236. //显示下半屏内容设置
  237.    for(i=0;i<32;i++)            
  238.     {
  239.       Write_Cmd(0x80 + i); //SET 垂直地址 VERTICAL ADD
  240.       Write_Cmd(0x88);     //SET 水平地址 HORIZONTAL ADD
  241.       for(j=0;j<16;j++)
  242.        {
  243.          Write_Data(*img);
  244.          img++;
  245.        }
  246.     }  

  248. }
  249. /*------------------------------------------------
  250.                  设置到绘图模式
  251. ------------------------------------------------*/
  252. void SetGraphicMode()
  253. {
  254.    Write_Cmd(0x36);       //选择8bit数据流 图形模式
  255.    DelayUs2x(20);

  257. }
  258. /*------------------------------------------------
  259.                  主程序
  260. ------------------------------------------------*/
  261. main()
  262. {
  263.   unsigned char i;
  264.    CGRAM();     //写入自定义字符
  265.    while(1)
  266.    {

  268.       Init_ST7920();   //初始化
  269.       LCD_PutString(0,1,"  单片机  ");
  270.           LCD_PutString(0,2,"技术论坛");
  271.           LCD_PutString(0,3,"LCD12864点阵液晶");
  272.       LCD_PutString(0,4,"ST7920  测试程序");   
  273.           DisplayCGRAM(7,1); //在第一行第一个位置和
  274.           DisplayCGRAM(0,1);//最后一个位置写入自定义图片笑脸
  275.           //延时30x200ms   
  276.       for(i=0;i<30;i++)
  277.           DelayMs(200);

  279.           LCD_PutString(0,1,"  专用技术论坛  ");
  280.           LCD_PutString(0,2," wwwxxxx.net ");
  281.           LCD_PutString(0,3," wwwxxxxxcom ");
  282.       LCD_PutString(0,4,"  专业成就卓越! ");   
  283.           DisplayCGRAM(0,1); //写入自定义图片笑脸
  284.           DisplayCGRAM(0,4);
  285.           //延时30x200ms   
  286.       for(i=0;i<30;i++)
  287.           DelayMs(200);

  289.           ClrScreen();          //清屏
  290.           SetGraphicMode();     //设置成绘图模式
  291.       LCD_PutGraphic(pic1); //调入一幅图画
  292.       //延时20x200ms
  293.       for(i=0;i<20;i++)
  294.           DelayMs(200);

  296.           ClrScreen();
  297.          


  300.    }
  301. }
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沙发
ID:328014 发表于 2020-9-16 21:10 | 只看该作者
这个是往st7920寄存器里面写数据,要弄懂这个必须得先精通液晶的寄存器才行
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