有大神能帮帮解读一段程序吗？lm3122液晶官方演示程序

Leimonkey

大神能帮我解读下红色箭头的这段程序吗？C语言刚学不久，前面的都能看懂，就是这一句看不懂了；这是一块lm3122（无字库）液晶的官方演示程序；

单纯数字的话能显示，但是是倒过来的，中文的话就显示不正常了

decai

指针都是一道坎.要突破的一个瓶颈
在这个函数里.可以把displaydata当成是一个数组
那么这句的意思其实就是tempdata=displaydata[i*202+j]
最里面的括号就没什么好说的了.
中间的括号就是displaydata+xxx,displaydata这个变量表示的地址往后推xxx个u_int的地址
整个括号内的都是在计算变量存放在哪的意思
再在括号前加个*,那就是该地址内存的数据,由括号内计算得到的地址把数据读过来给tempdata

Leimonkey

decai 发表于 2021-1-27 19:40
指针都是一道坎.要突破的一个瓶颈
在这个函数里.可以把displaydata当成是一个数组
那么这句的意思其实就是t ...

中括号里的数据是按正常的加减乘除吗？

玛德陛下

displaydata 是个指针

在　u_int * 做了定义

后面 *表示取内容

在主程序里面应该定义有显示缓存，808字节，还不小，一般51装不下，就128的RAM,

好像函数传递指针，这样可以减少编译空间吧。

Leimonkey

这是程序代码

1. //-------------------------------------------
   
2. // Shenzhen TOPWAY Technology Co. Ltd.
   
3. // LCD Module:        LM3122
   
4. // Display size:      202x32
   
5. // Driver/Controller: AX6120/AX6121
   
6. // Date:              2005-02-24
   
7. //-------------------------------------------
   
8. #include <stdio.h>
   
9. #include <reg51.h>
   
10. #include <intrins.h>
    
11. 
    
12. #define u_char  unsigned char
    
13. #define u_int   unsigned int
    
14. 
    
15. sbit RES        = P3^5;       
    
16. sbit _WR1        = P3^1;
    
17. sbit _WR2        = P3^2;
    
18. sbit _WR3        = P3^3;
    
19. sbit A0                = P3^6;
    
20. // DataBus = P1
    
21. 
    
22. //====================
    
23. // Display Data
    
24. //====================
    
25. /*--  TOPWAY 202x32     --*/
    
26. u_int code Logo1[]={
    
27. 0xFE,0xFE,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,
    
28. 0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0xFE,0xFE,0x00,0x00,0x80,
    
29. 0xE0,0x70,0x38,0x18,0x0C,0x06,0x06,0x02,0x03,0x01,0x81,0x81,0x81,0x81,0x81,0x81,
    
30. 0x81,0x01,0x03,0x02,0x06,0x06,0x0C,0x1C,0x38,0x70,0xE0,0xC0,0x00,0x00,0x00,0x00,
    
31. 0xFE,0xFE,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,
    
32. 0x02,0x02,0x02,0x02,0x06,0x04,0x04,0x0C,0x18,0x30,0xE0,0xC0,0x00,0x06,0x7E,0xFA,
    
33. 0x82,0x02,0x02,0x02,0x02,0x02,0xFE,0xFE,0x80,0x00,0x00,0x00,0x00,0xF0,0xFE,0x1E,
    
34. 0x02,0x02,0x02,0x02,0x02,0x1E,0xFE,0xF0,0x00,0x00,0x00,0x00,0x80,0xFE,0xFE,0x02,
    
35. 0x02,0x02,0x02,0x02,0x82,0xFA,0x7E,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    
36. 0x00,0xE0,0xFC,0x1E,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x1E,0xFC,0xE0,
    
37. 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x02,0x0E,0x1E,0x7A,0xE2,0x82,0x02,
    
38. 0x02,0x02,0x02,0x06,0x1E,0x78,0xE0,0x80,0x00,0x00,0x00,0x80,0xE0,0x78,0x1E,0x06,
    
39. 0x02,0x02,0x02,0x02,0x82,0xE2,0x7A,0x1E,0x0E,0x02,0x01,0x01,0x01,0x01,0x01,0x01,
    
40. 0x01,0x01,0x01,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFF,0x01,0x01,
    
41. 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0xF8,0xFF,0x0F,0x01,0x00,0x00,0x00,0x00,0x00,
    
42. 0xF0,0xFE,0x0F,0x03,0x01,0x00,0x00,0x00,0x00,0x00,0x01,0x03,0x0F,0xFE,0xF0,0x00,
    
43. 0x00,0x00,0x00,0x00,0x01,0x07,0xFF,0xF8,0x00,0x00,0xFF,0xFF,0x00,0x00,0x00,0x00,
    
44. 0x00,0x00,0x00,0x7F,0x7F,0x41,0x41,0x41,0x41,0x41,0x41,0x63,0x3E,0x1C,0x00,0x00,
    
45. 0x00,0x00,0x00,0x00,0x80,0xFF,0x7F,0x00,0x00,0x07,0xFF,0xF8,0x80,0x00,0x00,0x00,
    
46. 0x00,0x3F,0xFF,0xE0,0x00,0xC0,0xFE,0x7F,0x03,0x00,0x80,0xFC,0xFC,0xFC,0x80,0x00,
    
47. 0x03,0x7F,0xFE,0xC0,0x00,0xE0,0xFF,0x3F,0x00,0x00,0x00,0x00,0x80,0xF8,0xFF,0x07,
    
48. 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0xF8,0x3F,0x07,0x00,0x00,0x00,0x00,
    
49. 0xF0,0xFE,0x0F,0xFE,0xE0,0x00,0x00,0x00,0x00,0x07,0x3F,0xF8,0xC0,0x00,0x00,0x00,
    
50. 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x07,0x1E,0x38,0xE0,0xC0,0x00,0x00,0x00,
    
51. 0x01,0x07,0x1E,0x38,0x1E,0x07,0x01,0x00,0x00,0x00,0xC0,0xE0,0x38,0x1E,0x07,0x01,
    
52. 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFF,0x00,
    
53. 0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    
54. 0x00,0x1F,0xFF,0xE0,0x80,0x00,0x00,0x00,0x00,0x00,0x0F,0x7F,0xF0,0xC0,0x80,0x00,
    
55. 0x00,0x00,0x00,0x00,0x80,0xC0,0xF0,0x7F,0x0F,0x00,0x00,0x00,0x00,0x00,0x80,0xE0,
    
56. 0xFF,0x1F,0x00,0x00,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xE0,0xE0,0x20,
    
57. 0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x30,0x10,0x10,0x18,0x0C,0x0E,0x07,0x01,
    
58. 0x00,0x00,0x00,0x00,0x00,0x0F,0xFF,0xF8,0x80,0x00,0x00,0x00,0x0F,0xFF,0xFE,0x7F,
    
59. 0x03,0x00,0x00,0xE0,0xFF,0x1F,0x00,0x1F,0xFF,0xE0,0x00,0x00,0x03,0x7F,0xFE,0xFF,
    
60. 0x0F,0x00,0x00,0x00,0x80,0xF8,0xFF,0x0F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,
    
61. 0xF8,0x3F,0x07,0x01,0x00,0x00,0x00,0x00,0x78,0x7F,0x47,0x40,0x40,0x40,0x47,0x7F,
    
62. 0x78,0x00,0x00,0x00,0x00,0x01,0x0F,0x3F,0xF8,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,
    
63. 0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x0F,0xFC,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,
    
64. 0x00,0xF8,0xFC,0x0F,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    
65. 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFF,0x80,0x80,0x80,0x80,0x80,0x80,0x80,
    
66. 0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x07,0x0E,
    
67. 0x1C,0x18,0x30,0x60,0x60,0x40,0xC0,0x80,0x81,0x81,0x81,0x81,0x81,0x81,0x81,0x80,
    
68. 0xC0,0x40,0x60,0x60,0x30,0x18,0x1C,0x0E,0x07,0x01,0x00,0x00,0x00,0x00,0xFF,0xFF,
    
69. 0x80,0x80,0x80,0x80,0x80,0x80,0x80,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    
70. 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    
71. 0x00,0x0F,0xFF,0xF0,0x80,0x80,0x80,0x81,0x81,0x80,0x80,0x80,0xF8,0xFF,0x07,0x00,
    
72. 0x00,0x00,0x07,0xFF,0xF8,0x80,0x80,0x80,0x81,0x81,0x80,0x80,0x80,0xF0,0xFF,0x0F,
    
73. 0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xF0,0xFE,0x8F,0x81,0x80,0x80,0x80,0x80,0xC0,
    
74. 0xF8,0x38,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x38,0xF8,0xC0,0x80,0x80,
    
75. 0x80,0x80,0x81,0x8F,0xFE,0xF0,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    
76. 0x00,0x00,0xFF,0xFF,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0xFF,0xFF,0x00,0x00,0x00,
    
77. 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
    
78. 
    
79. //====================
    
80. // delay routine
    
81. //====================
    
82. void delay100us(void)        //delay 100us for 12MHz
    
83. {
    
84. u_char data i;
    
85. for(i=0;i<=70;i++)
    
86.         {_nop_(); _nop_();}
    
87. }
    
88. 
    
89. void delay1ms(void)                //delay 1ms for 12MHz
    
90. {
    
91. u_char data i;
    
92. for(i=0;i<=250;i++)
    
93.         {_nop_(); _nop_();}
    
94. }
    
95. 
    
96. void delay100ms(void)
    
97. {
    
98. u_char data j;
    
99. for(j=0;j<=100;j++)
    
100.         {delay1ms();}       
     
101. }
     
102. 
     
103. 
     
104. //====================
     
105. // write command
     
106. //====================
     
107. void wr_command(u_char ChipNo,command)
     
108. {
     
109. P1 = command;
     
110. A0=0;
     
111. _nop_();
     
112. switch(ChipNo)
     
113.         {
     
114.         case 0:        _WR1=0; _WR2=0; _WR3=0;  break;// write into all driver
     
115.         case 1:        _WR1=0; _WR2=1; _WR3=1;  break;// write into 1st driver
     
116.         case 2:        _WR1=1; _WR2=0; _WR3=1;  break;// write into 2nd driver
     
117.         case 3:        _WR1=1; _WR2=1; _WR3=0;  break;// write into 3rd driver
     
118.         }
     
119. _WR1=1; _WR2=1; _WR3=1;
     
120. delay100us();
     
121. }
     
122. 
     
123. //====================
     
124. // write data
     
125. //====================
     
126. void wr_data(u_char ChipNo,ddata)
     
127. {
     
128. P1 = ddata;
     
129. A0=1;
     
130. _nop_();
     
131. switch(ChipNo)
     
132.         {
     
133.         case 0:        _WR1=0; _WR2=0; _WR3=0; break; // write into all driver
     
134.         case 1:        _WR1=0; _WR2=1; _WR3=1; break; // write into 1st driver
     
135.         case 2:        _WR1=1; _WR2=0; _WR3=1; break; // write into 2nd driver
     
136.         case 3:        _WR1=1; _WR2=1; _WR3=0; break; // write into 3rd driver
     
137.         }
     
138. _WR1=1; _WR2=1; _WR3=1;
     
139. }
     
140. 
     
141. //====================
     
142. // clear screen
     
143. //====================
     
144. void ClrScreen()        // fill 00h into DD RAM
     
145. {
     
146. u_char i,j;
     
147. for(i=0;i<4;i++)
     
148.             {
     
149.             wr_command(0,0xb8 | i);        // select page
     
150.             wr_command(0,0x00);        // start form column 0
     
151.             for(j=0;j<80;j++)
     
152.                     {
     
153.                     wr_data(0,0x00);// fill 00h in to DD RAM
     
154.                     }
     
155.             }
     
156. }
     
157. 
     
158. //====================
     
159. // Write a Screen
     
160. //====================
     
161. void WriteScreen(u_int *DisplayData)        // DisplayData should be 202x32/8 = 808 bytes
     
162. {
     
163.         u_char TempData;
     
164.         u_char i, j;
     
165.         for(i=0;i<4;i++)
     
166.         {
     
167.             wr_command(0,0xb8 | i);        // select page
     
168.             wr_command(0,0);        // all chip start form column 0
     
169.              for(j=0;j<201;j++)
     
170.                      {
     
171.                      TempData=(*(DisplayData+(i*202)+j));
     
172.                      if (j<61)
     
173.                         {
     
174.                              wr_data(1,TempData);        // 0-60 column goto chip1
     
175.                         }
     
176.                     else if ((j>=61)&(j<=140))
     
177.                         {
     
178.                              wr_data(2,TempData);        // 61-141 column goto chip2
     
179.                         }
     
180.                     else
     
181.                         {
     
182.                              wr_data(3,TempData);        // 141-201 column goto chip3
     
183.                         }
     
184.                 }
     
185.             }
     
186.            
     
187. }
     
188. 
     
189. //====================
     
190. // Init LCD module
     
191. //====================
     
192. void initLCDM(void)
     
193. {
     
194.         _WR1=1; _WR2=1; _WR3=1;        // init WR status
     
195.         RES = 0;
     
196.         delay1ms();
     
197.         RES = 1;
     
198.         delay1ms();
     
199.         RES = 0;                // RES=0, 80 I/F mode
     
200.         wr_command(0,0xa9);        // set duty cycle 1/32
     
201.         wr_command(0,0xa4);        // static drive = OFF
     
202.         wr_command(0,0xa0);        // adc=0
     
203.         wr_command(0,0xc0);        // display start line =0;
     
204.         wr_command(0,0xaf);        // display ON;
     
205.         //wr_command(0,0xee);   // read modify write=Off;
     
206. }
     
207. 
     
208. //************************
     
209. // Main Program
     
210. //************************
     
211. void main(void)
     
212. {
     
213. SP = 0x60;                        // stack pointer
     
214. EA = 0;                         // disable interrupts
     
215. 
     
216. initLCDM();                // init LCD module
     
217. ClrScreen();                // clear DD RAM
     
218. WriteScreen(Logo1);        //send a screen of display
     
219. 
     
220. while(1)                        // end of program
     
221.         {
     
222.         _nop_();
     
223.         }
     
224. }
     

复制代码

hxjxyz

如果显示方向不对，查初始化代码

ccma1000

字模方向不符合要求

慕名而来

应该根据LCD屏的驱动芯片的型号查找数据手册，而后才能调整字体的显示方式以及字符取模的设置方式，现在已经可以显示数字了，接下来应该好弄了。

Leimonkey

慕名而来 发表于 2021-1-28 11:20
应该根据LCD屏的驱动芯片的型号查找数据手册，而后才能调整字体的显示方式以及字符取模的设置方式，现在已 ...

已经显示正常了，之前参数没调对