标题: TFT2.4寸显示屏不显示 [打印本页]

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作者: LAW1100    时间: 2025-6-24 19:31
标题: TFT2.4寸显示屏不显示
前几天在淘宝上购了一块TFT2.4寸显示屏回来玩玩，驱动IC是ILI9341,卖家附有例程资料，按照例程资料弄个简单的刷屏却只有背光亮，其它啥也没有，检查了好几遍没解决，把我搞矇逼了，问了卖家说出厂检查过没问题，特在这向大佬请教下：

1. 
   
2. #include <AI8051U.H>
   
3. #include <intrins.h>
   
4. 
   
5. //#include "lcd.h"
   
6. #define uchar unsigned char
   
7. #define uint unsigned int
   
8. 
   
9. #define RED   0XF800
   
10. #define GREEN 0X07E0
    
11. #define BLUE  0X001F
    
12. #define WHITE 0XFFFF
    
13. 
    
14. sbit LCD_CS = P1^2; // 片选
    
15. sbit LCD_RESET = P1^6;
    
16. sbit LCD_MOSI = P3^1;
    
17. sbit LCD_DC =P1^3;// 数据/命令控制
    
18. sbit LCD_SCK = P3^0;// SPI时钟
    
19. 
    
20. void Delay1ms() //@12.000MHz
    
21. {
    
22. unsigned char i, j;
    
23. 
    
24. i = 12;
    
25. j = 169;
    
26. do
    
27. {
    
28. while (--j);
    
29. } while (--i);
    
30. }
    
31. 
    
32. void delay_ms(unsigned int ms)
    
33. {
    
34. while(ms--)
    
35. {
    
36. Delay1ms();
    
37. }
    
38. }
    
39. // SPI延时（根据实际速度调整）
    
40. void SPI_Delay()
    
41.         {
    
42.     _nop_(); _nop_(); _nop_();
    
43.     _nop_(); _nop_(); _nop_();
    
44. }
    
45. void SPI_RW(unsigned char byte)
    
46. {
    
47.   unsigned char i;
    
48.     for(i=0; i<8; i++)
    
49.           {
    
50.         LCD_SCK = 0;
    
51.         if(byte & 0x80) LCD_MOSI = 1;
    
52.         else LCD_MOSI = 0;
    
53.         SPI_Delay();
    
54.         LCD_SCK = 1;
    
55.         byte <<= 1;
    
56.                           SPI_Delay() ;
    
57.    }
    
58. }
    
59. void LCD_WR_REG(unsigned char reg)
    
60. {
    
61. LCD_DC = 1; // 命令模式
    
62.     LCD_CS = 0; // 使能片选
    
63.     SPI_RW(reg);
    
64.     LCD_CS = 1; // 禁用片选
    
65. }
    
66. void LCD_WR_DATA(unsigned char val)
    
67. {
    
68.    LCD_DC = 0; // 数据模式
    
69.     LCD_CS = 0;
    
70.     SPI_RW(val);
    
71.     LCD_CS = 1;
    
72. }
    
73. 
    
74. 
    
75. 
    
76. void LCD_Init()
    
77. {
    
78. 
    
79. LCD_RESET=0;
    
80. delay_ms(10);
    
81. LCD_RESET=1;
    
82. delay_ms(120);
    
83. LCD_WR_REG(0xCF);
    
84. LCD_WR_DATA(0x00);
    
85. LCD_WR_DATA(0xC1);
    
86. LCD_WR_DATA(0X30);
    
87. LCD_WR_REG(0xED);
    
88. LCD_WR_DATA(0x64);
    
89. LCD_WR_DATA(0x03);
    
90. LCD_WR_DATA(0X12);
    
91. LCD_WR_DATA(0X81);
    
92. LCD_WR_REG(0xE8);
    
93. LCD_WR_DATA(0x85);
    
94. LCD_WR_DATA(0x10);
    
95. LCD_WR_DATA(0x7A);
    
96. LCD_WR_REG(0xCB);
    
97. LCD_WR_DATA(0x39);
    
98. LCD_WR_DATA(0x2C);
    
99. LCD_WR_DATA(0x00);
    
100. LCD_WR_DATA(0x34);
     
101. LCD_WR_DATA(0x02);
     
102. LCD_WR_REG(0xF7);
     
103. LCD_WR_DATA(0x20);
     
104. LCD_WR_REG(0xEA);
     
105. LCD_WR_DATA(0x00);
     
106. LCD_WR_DATA(0x00);
     
107. LCD_WR_REG(0xC0); //Power control
     
108. LCD_WR_DATA(0x1B);//VRH[5:0]
     
109. LCD_WR_REG(0xC1);//Pwer control
     
110. LCD_WR_DATA(0x01);//SAP[2:0];BT[3:0]
     
111. LCD_WR_REG(0xC5); //VCM control
     
112. LCD_WR_DATA(0x30); //3F
     
113. LCD_WR_DATA(0x30); //3C
     
114. LCD_WR_REG(0xC7); //VCM control2
     
115. LCD_WR_DATA(0XB7);
     
116. LCD_WR_REG(0x36); // Memory Access Control
     
117. LCD_WR_DATA(0x48);
     
118. LCD_WR_REG(0x3A);
     
119. LCD_WR_DATA(0x55);
     
120. LCD_WR_REG(0xB1);
     
121. LCD_WR_DATA(0x00);
     
122. LCD_WR_DATA(0x1A);
     
123. LCD_WR_REG(0xB6); // Display Function Control
     
124. LCD_WR_DATA(0x0A);
     
125. LCD_WR_DATA(0xA2);
     
126. LCD_WR_REG(0xF2);// 3Gamma Function Disable
     
127. LCD_WR_DATA(0x00);
     
128. LCD_WR_REG(0x26); //Gamma curve selected
     
129. LCD_WR_DATA(0x01);
     
130. LCD_WR_REG(0xE0); //Set Gamma
     
131. LCD_WR_DATA(0x0F);
     
132. LCD_WR_DATA(0x2A);
     
133. LCD_WR_DATA(0x28);
     
134. LCD_WR_DATA(0x08);
     
135. LCD_WR_DATA(0x0E);
     
136. LCD_WR_DATA(0x08);
     
137. LCD_WR_DATA(0x54);
     
138. LCD_WR_DATA(0XA9);
     
139. LCD_WR_DATA(0x43);
     
140. LCD_WR_DATA(0x0A);
     
141. LCD_WR_DATA(0x0F);
     
142. LCD_WR_DATA(0x00);
     
143. LCD_WR_DATA(0x00);
     
144. LCD_WR_DATA(0x00);
     
145. LCD_WR_DATA(0x00);
     
146. LCD_WR_REG(0XE1); //Set Gamma
     
147. LCD_WR_DATA(0x00);
     
148. LCD_WR_DATA(0x15);
     
149. LCD_WR_DATA(0x17);
     
150. LCD_WR_DATA(0x07);
     
151. LCD_WR_DATA(0x11);
     
152. LCD_WR_DATA(0x06);
     
153. LCD_WR_DATA(0x2B);
     
154. LCD_WR_DATA(0x56);
     
155. LCD_WR_DATA(0x3C);
     
156. LCD_WR_DATA(0x05);
     
157. LCD_WR_DATA(0x10);
     
158. LCD_WR_DATA(0x0F);
     
159. LCD_WR_DATA(0x3F);
     
160. LCD_WR_DATA(0x3F);
     
161. LCD_WR_DATA(0x0F);
     
162. LCD_WR_REG(0x2B);
     
163. LCD_WR_DATA(0x00);
     
164. LCD_WR_DATA(0x00);
     
165. LCD_WR_DATA(0x01);
     
166. LCD_WR_DATA(0x3f);
     
167. LCD_WR_REG(0x2A);
     
168. LCD_WR_DATA(0x00);
     
169. LCD_WR_DATA(0x00);
     
170. LCD_WR_DATA(0x00);
     
171. LCD_WR_DATA(0xef);
     
172. LCD_WR_REG(0x11); //Exit Sleep
     
173. delay_ms(120);
     
174. LCD_WR_REG(0x29); //display on? ? ? ?
     
175. }
     
176. 
     
177. void LCD_SetArea(unsigned int stx,unsigned int sty,unsigned int endx,unsigned int endy)
     
178. {
     
179. LCD_WR_REG(0x2A);
     
180. LCD_WR_DATA(stx>>8);
     
181. LCD_WR_DATA(stx&0xff);
     
182. LCD_WR_DATA(endx>>8);
     
183. LCD_WR_DATA(endx&0xff);
     
184. 
     
185. LCD_WR_REG(0x2B);
     
186. LCD_WR_DATA(sty>>8);
     
187. LCD_WR_DATA(sty&0xff);
     
188. LCD_WR_DATA(endy>>8);
     
189. LCD_WR_DATA(endy&0xff);
     
190. }
     
191. 
     
192. void LCD_Clear(unsigned int color)
     
193. {
     
194. unsigned int i,j;
     
195. 
     
196. LCD_SetArea(0,0,239,319);
     
197. LCD_WR_REG(0x2C);
     
198. for(i=0;i<320;i++)
     
199. {
     
200. for(j=0;j<240;j++)
     
201. {
     
202. LCD_WR_DATA(color>>8);
     
203. LCD_WR_DATA(color);
     
204. }
     
205. }
     
206. }
     
207. 
     
208. void main()
     
209. {
     
210.         P3M0=0xFF;
     
211.         P3M1=0x00;
     
212.         P1M0=0x00;
     
213.         P1M1=0x00;
     
214. delay_ms(100);
     
215. LCD_Init();
     
216. 
     
217. while(1)
     
218. {
     
219. LCD_Clear(RED);
     
220. delay_ms(300);
     
221. LCD_Clear(WHITE);
     
222. delay_ms(300);
     
223. LCD_Clear(BLUE);
     
224. delay_ms(300);
     
225. LCD_Clear(GREEN);
     
226. delay_ms(300);
     
227. }
     
228. }

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作者: LAW1100    时间: 2025-6-24 19:32

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作者: LAW1100    时间: 2025-6-25 08:43
有那位大佬看出什么问题来？

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作者: powerdruy    时间: 2025-6-25 10:10
1，LCD片选选中的同时，TP的片选应该要关闭
2，检查SPI通信波形，测试SPI读取ILI9341版本寄存器之类是否正确

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作者: LAW1100    时间: 2025-6-25 17:16

powerdruy 发表于 2025-6-25 10:10
1，LCD片选选中的同时，TP的片选应该要关闭
2，检查SPI通信波形，测试SPI读取ILI9341版本寄存器之类是否正 ...

在家里没有仪器测，真麻烦。

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作者: rayin    时间: 2025-6-27 11:59
要检查一下SPI的SCL/MOSI/RS三条信号线有没有接错. MISO不需要接线. 点屏不需要示波器, 万用表检查线路就可以了

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