mtk android lcm调试

参考MTK 文档LCM_Customer_document_MT6575.pdf

The following shows the steps to add a new LCM driver:

(1)  Create LCM driver folder $LCM in alps/mediatek/custom/common/kernel/lcm/

(2)  Create LCM driver source file $LCM.c in alps/mediatek/custom/common/kernel/lcm/$LCM

(3)  Implement LCM driver and export lcm_driver_list/lcm_count variables.

Adaptive LCM Support 

At first you should add you new lcm driver as listed in the previous section, and then add the 

adaptive support: 

1.  Modify the adaptive lcm driver common file:  

alps/mediatek/custom/common/kernel/lcm/mt65xx_lcm_list.c

2.  Add the new LCM driver global variables as shown in the figure below:

3.  [VERY IMPORTANT] Please delete the unused LCM driver folder in the customization folder, 

such as shown in the figure below:

4. But what if I didn’t delete the folders un-usable? The code size will increase, because the 

other LCM drivers will be compiled into codebase too; And if your project doesn’t define 

GPIO usage for serial interface, there will be build error.

5.  Modify the project makefile alps/mediate/config/(project)/ProjetConfig.mk 

Modify CUSTOM_KERNEL_LCM=mt65xx 

Modify CUSTOM_UBOOT_LCM=mt65xx

Case Study – DBI Interface LCM Driver Porting 

In this chapter, we’ll go through a real case study of DBI LCM driver porting.

LCM specifications: 

  LCM Drive IC: hx8369 

  Interface: 24-bit 80 system bus interface 

  LCD size: 480*800 

  

1.  Create LCM driver folder and LCM driver source file 

alps/mediatek/custom/common/kernel/lcm/hx8369/lcm_dr.c 



2.  Modify the project makefile alps/mtk/make/$(project).mak 

Add CUSTOM_KERNEL_LCM= hx8369 

Add CUSTOM_UBOOT_LCM= hx8369 



3.  Fill the LCM parameters 

A.  Configure the basic information according to the HW connection, LCM type and LCM size:

MT6575 LCD IO selection is as shown in following table. LCD data pin can share between DPI and NAND data pin

For example, we use 24bits DBI interface LCM, and connect LCM data pin to MT6575 baseband 

Pin DPIR[7:0], DPIG[7:0], DPIB[7:0]. So we must set io_select_mode to be 1; if connect LCM data 

pin to Nand IF, we must set io_select_mode to be 0

B.  Configure data format according to the RGB data pin assignment of the LCM datasheet

C.  Configure LCM waveform timing according to the requirement specified in the LCM datasheet

Note: MT6575 LCD controller clock frequency is 130MHz, so clock cycle time is 1/130MHz = 7.69ns

4.  Implement LCM init function

According the init process specified in LCM datasheet, pull down/up the reset pin, delay and set 

LCM init register settings.

5.  Implement LCM update function 

Send the block update commands to LCM

6.  Implement LCM suspend/resume functions 

Send suspend/resume commands to LCM

7. Rebuild uboot and kernel 

In the root directory: 

./mk $(project) gen_cust 

./mk $(project) remake uboot/kernel 

./mk $(project) bootimage

参考代码：

[cpp] view
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    SAN FRANCISCO, CA, UNDER
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    (ICC).
33. *
34. *****************************************************************************/
35. #include <linux/string.h>
36. #include "lcm_drv.h"
37. //#include <linux/kernel.h> //for printk()
38. //extern void printf(const char* fmt, ...);
39. #ifdef BUILD_UBOOT
40. #include <asm/arch/mt6575_gpio.h>
41. #define print(x...) printf(x)
42. #else
43. #include <mach/mt6575_gpio.h>
44. #define print(x...) printk(x)
45. #endif
46. //libin modify for M1-4 on 20120726
47. #define GPIO_LCD_RST   18 //GPIO18
48. #define  GPIO_MODE_00  0
49. #define GPIO_DIR_OUT   1
50. #define GPIO_OUT_ONE  1
51. #define GPIO_OUT_ZERO  0
52. extern s32
    mt_set_gpio_mode(u32 u4Pin, u32 u4Mode);
53. extern s32
    mt_set_gpio_out(u32 u4Pin, u32 u4PinOut);
54. extern s32
    mt_set_gpio_dir(u32 u4Pin, u32 u4Dir);
55. // ---------------------------------------------------------------------------
56. //  Local Constants
57. // ---------------------------------------------------------------------------
58. #define FRAME_WIDTH  (320)
59. #define FRAME_HEIGHT (480)
60. // ---------------------------------------------------------------------------
61. //  Local Variables
62. // ---------------------------------------------------------------------------
63. static LCM_UTIL_FUNCS
    lcm_util = {0};
64. #define SET_RESET_PIN(v)    (lcm_util.set_reset_pin((v)))
65. #define UDELAY(n) (lcm_util.udelay(n))
66. #define MDELAY(n) (lcm_util.mdelay(n))
67. // ---------------------------------------------------------------------------
68. //  Local Functions
69. // ---------------------------------------------------------------------------
70. static __inline
    unsigned int HIGH_BYTE(unsigned int val)
71. {
72. return (val
    >> 8) & 0xFF;
73. }
74. static __inline
    unsigned int LOW_BYTE(unsigned int val)
75. {
76. return (val
    & 0xFF);
77. }
78. static __inline void send_ctrl_cmd(unsigned int cmd)
79. {
80. //MDELAY(5);
81. //mt_set_gpio_out(16, GPIO_OUT_ZERO);
82. lcm_util.send_cmd(cmd);
83. //  mt_set_gpio_out(16, GPIO_OUT_ONE);
84. }
85. static __inline void send_data_cmd(unsigned int data)
86. {
87. //MDELAY(5);
88. //mt_set_gpio_out(16, GPIO_OUT_ZERO);
89. lcm_util.send_data(data);
90. //  mt_set_gpio_out(16, GPIO_OUT_ONE);
91. }
92. static __inline
    unsigned int read_data_cmd()
93. {
94. return lcm_util.read_data();
95. }
96. static __inline void set_lcm_register(unsigned int regIndex,
97. unsigned int regData)
98. {
99. send_ctrl_cmd(regIndex);
100. send_data_cmd(regData);
101. }
102. static void init_lcm_registers(void)
103. {
104. send_ctrl_cmd(0xF1);
105. send_data_cmd(0x36);
106. send_data_cmd(0x04);
107. send_data_cmd(0x00);
108. send_data_cmd(0x3C);
109. send_data_cmd(0x0F);
110. send_data_cmd(0x8F);
111. send_ctrl_cmd(0xf2);
112. send_data_cmd(0x18);
113. send_data_cmd(0xa3);
114. send_data_cmd(0x12);
115. send_data_cmd(0x02);
116. send_data_cmd(0xb2);
117. send_data_cmd(0x12);
118. send_data_cmd(0xff);
119. send_data_cmd(0x10);
120. send_data_cmd(0x00);
121. send_ctrl_cmd(0xf8);
122. send_data_cmd(0x21);
123. send_data_cmd(0x04);
124. send_ctrl_cmd(0xf9);
125. send_data_cmd(0x00);
126. send_data_cmd(0x08);
127. send_ctrl_cmd(0xC0);
128. send_data_cmd(0x0F);
129. send_data_cmd(0x0F);
130. send_ctrl_cmd(0xc1);
131. send_data_cmd(0x42);
132. send_ctrl_cmd(0xC2);
133. send_data_cmd(0x22);
134. send_ctrl_cmd(0xc5);
135. send_data_cmd(0x00);
136. send_data_cmd(0x08);
137. send_data_cmd(0x80);
138. send_ctrl_cmd(0xb1);
139. send_data_cmd(0xB0);
140. send_data_cmd(0x11);
141. send_ctrl_cmd(0xb4);
142. send_data_cmd(0x02);
143. send_ctrl_cmd(0xb6);
144. send_data_cmd(0x02);
145. send_data_cmd(0x02); //cpu?02
146. send_ctrl_cmd(0xb7);
147. send_data_cmd(0xC6);
148. send_ctrl_cmd(0x3a);
149. send_data_cmd(0x66/*0x55*/);//16bit
     ?55  18bit  ?66
150. send_ctrl_cmd(0x35);
151. send_data_cmd(0x00);
152. send_ctrl_cmd(0x44);
153. send_data_cmd(0x00);
154. send_data_cmd(0x5f);
155. send_ctrl_cmd(0x36);
156. send_data_cmd(0x08); // 0xc8
157. send_ctrl_cmd(0x2a);
158. send_data_cmd(0x00);
159. send_data_cmd(0x00);
160. send_data_cmd(0x01);
161. send_data_cmd(0x3f);
162. send_ctrl_cmd(0x2b);
163. send_data_cmd(0x00);
164. send_data_cmd(0x00);
165. send_data_cmd(0x01);
166. send_data_cmd(0xdf);
167. send_ctrl_cmd(0xe0);
168. send_data_cmd(0x00);
169. send_data_cmd(0x1D);
170. send_data_cmd(0x19);
171. send_data_cmd(0x0c);
172. send_data_cmd(0x0f);
173. send_data_cmd(0x0A);
174. send_data_cmd(0x45);
175. send_data_cmd(0x95);
176. send_data_cmd(0x38);
177. send_data_cmd(0x0a);
178. send_data_cmd(0x12);
179. send_data_cmd(0x03);
180. send_data_cmd(0x09);
181. send_data_cmd(0x06);
182. send_data_cmd(0x00);
183. send_ctrl_cmd(0xe1);
184. send_data_cmd(0x0f);
185. send_data_cmd(0x37);
186. send_data_cmd(0x35);
187. send_data_cmd(0x0C);
188. send_data_cmd(0x0d);
189. send_data_cmd(0x04);
190. send_data_cmd(0x48);
191. send_data_cmd(0x43);
192. send_data_cmd(0x35);
193. send_data_cmd(0x04);
194. send_data_cmd(0x0D);
195. send_data_cmd(0x02);
196. send_data_cmd(0x1C);
197. send_data_cmd(0x18);
198. send_data_cmd(0x0F);
199. send_ctrl_cmd(0x11);
200. MDELAY(120);
201. send_ctrl_cmd(0x29);
202. send_ctrl_cmd(0x2c);
203. MDELAY(10);
204. }
205. // ---------------------------------------------------------------------------
206. //  LCM Driver Implementations
207. // ---------------------------------------------------------------------------
208. static void lcm_set_util_funcs(const LCM_UTIL_FUNCS
     *util)
209. {
210. memcpy(&lcm_util, util, sizeof(LCM_UTIL_FUNCS));
211. }
212. static void lcm_get_params(LCM_PARAMS
     *params)
213. {
214. memset(params, 0, sizeof(LCM_PARAMS));
215. params->type   = LCM_TYPE_DBI;
216. params->ctrl   = LCM_CTRL_PARALLEL_DBI;
217. params->width  = FRAME_WIDTH;
218. params->height = FRAME_HEIGHT;
219. params->io_select_mode = 1;
220. params->dbi.port                    = 0; // 1;
221. //params->dbi.clock_freq              = LCM_DBI_CLOCK_FREQ_104M; 
     //aa
222. params->dbi.data_width              = LCM_DBI_DATA_WIDTH_18BITS;//LCM_DBI_DATA_WIDTH_16BITS;
223. params->dbi.data_format.color_order = LCM_COLOR_ORDER_RGB;
224. params->dbi.data_format.trans_seq   = LCM_DBI_TRANS_SEQ_MSB_FIRST;
225. params->dbi.data_format.padding     = LCM_DBI_PADDING_ON_LSB; //LCM_DBI_PADDING_ON_LSB;
     //bb
226. params->dbi.data_format.format      = LCM_DBI_FORMAT_RGB666; //LCM_DBI_FORMAT_RGB565;
227. params->dbi.data_format.width       = LCM_DBI_DATA_WIDTH_18BITS; //LCM_DBI_DATA_WIDTH_16BITS;
228. params->dbi.cpu_write_bits          = LCM_DBI_CPU_WRITE_32_BITS; //LCM_DBI_CPU_WRITE_16_BITS;
229. params->dbi.io_driving_current      = LCM_DRIVING_CURRENT_6575_8MA ;  //
     0;
230. /* params->dbi.parallel.write_setup    = 1;
231. params->dbi.parallel.write_hold     = 1;
232. params->dbi.parallel.write_wait     = 9; // 3;
233. params->dbi.parallel.read_setup     = 1;
234. params->dbi.parallel.read_latency   = 31;
235. params->dbi.parallel.wait_period    = 2;*/
236. params->dbi.parallel.write_setup    = 2;
237. params->dbi.parallel.write_hold     = 2;
238. params->dbi.parallel.write_wait     = 15;
239. params->dbi.parallel.read_setup     = 1;
240. params->dbi.parallel.read_latency   = 31;
241. params->dbi.parallel.wait_period    = 2;
242. params->dbi.parallel.cs_high_width = 0;
243. // enable tearing-free
244. //  params->dbi.te_mode                 = LCM_DBI_TE_MODE_VSYNC_ONLY;
245. // params->dbi.te_edge_polarity        = LCM_POLARITY_FALLING;
246. /* params->dbi.te_mode                 = LCM_DBI_TE_MODE_VSYNC_OR_HSYNC;
247. params->dbi.te_edge_polarity        = LCM_POLARITY_RISING;
248. params->dbi.te_hs_delay_cnt         = 50;
249. params->dbi.te_vs_width_cnt         = 277;
250. params->dbi.te_vs_width_cnt_div     = LCM_DBI_TE_VS_WIDTH_CNT_DIV_16;*/
251. }
252. #define GPIO_LCD_RST   18 //GPIO18
253. #define  GPIO_MODE_00  0
254. #define GPIO_DIR_OUT   1
255. #define GPIO_OUT_ONE  1
256. #define GPIO_OUT_ZERO  0
257. extern s32
     mt_set_gpio_mode(u32 u4Pin, u32 u4Mode);
258. extern s32
     mt_set_gpio_out(u32 u4Pin, u32 u4PinOut);
259. extern s32
     mt_set_gpio_dir(u32 u4Pin, u32 u4Dir);
260. static void lcm_init(void)
261. {
262. /* SET_RESET_PIN(0);
263. MDELAY(200);
264. SET_RESET_PIN(1);
265. MDELAY(400);*/
266. // SET_RESET_PIN(1);
267. mt_set_gpio_mode(GPIO_LCD_RST,GPIO_MODE_00);
268. mt_set_gpio_dir(GPIO_LCD_RST,GPIO_DIR_OUT);
269. mt_set_gpio_out(GPIO_LCD_RST,GPIO_OUT_ONE);
270. MDELAY(1);
271. //SET_RESET_PIN(0);
272. mt_set_gpio_out(GPIO_LCD_RST,GPIO_OUT_ZERO);
273. MDELAY(10);
274. //SET_RESET_PIN(1);
275. mt_set_gpio_out(GPIO_LCD_RST,GPIO_OUT_ONE);
276. MDELAY(100);
277. init_lcm_registers();
278. }
279. static void lcm_suspend(void)
280. {
281. send_ctrl_cmd(0x28);
282. MDELAY(20);
283. send_ctrl_cmd(0x10);
284. MDELAY(100);
285. }
286. static void lcm_resume(void)
287. {
288. send_ctrl_cmd(0x11);
289. MDELAY(100);
290. send_ctrl_cmd(0x29);
291. //MDELAY(100);
292. /*
293. send_ctrl_cmd(0x29);
294. MDELAY(120);
295. send_ctrl_cmd(0x11);
296. MDELAY(120); */
297. }
298. static void lcm_update(unsigned int x,
     unsigned int y,
299. unsigned int width,
     unsigned int height)
300. {
301. unsigned int x0
     = x;
302. unsigned int y0
     = y;
303. unsigned int x1
     = x0 + width - 1;
304. unsigned int y1
     = y0 + height - 1;
305. print( "[LCM] *********************ili9486 lcm_update*******************\n\r");
306. send_ctrl_cmd(0x2A);
307. send_data_cmd(HIGH_BYTE(x0));
308. send_data_cmd(LOW_BYTE(x0));
309. send_data_cmd(HIGH_BYTE(x1));
310. send_data_cmd(LOW_BYTE(x1));
311. send_ctrl_cmd(0x2B);
312. send_data_cmd(HIGH_BYTE(y0));
313. send_data_cmd(LOW_BYTE(y0));
314. send_data_cmd(HIGH_BYTE(y1));
315. send_data_cmd(LOW_BYTE(y1));
316. // Write To GRAM
317. send_ctrl_cmd(0x2C);
318. }
319. static unsigned int lcm_compare_id(void)
320. {
321. return 1;
322. }
323. // ---------------------------------------------------------------------------
324. //  Get LCM Driver Hooks
325. // ---------------------------------------------------------------------------
326. LCM_DRIVER ili9486_lcm_drv =
327. {
328. .name           = "ili9486",
329. .set_util_funcs = lcm_set_util_funcs,
330. .get_params     = lcm_get_params,
331. .init           = lcm_init,
332. .suspend        = lcm_suspend,
333. .resume         = lcm_resume,
334. .update         = lcm_update,
335. .compare_id     = lcm_compare_id
336. };

注意事项：

1.调试屏幕主要的工作是初始化和时序设置

2.编译的时候，仅仅使用./mk r ub k 是不够的，还需要运行./mk bootimage命令

3.可能是更改了gpio口中LRSTB的原因导致reset失败，代码中通过以下代码手动设置reset信号

[cpp] view
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1. static void lcm_init(void)
2. {
3. // SET_RESET_PIN(1);
4. mt_set_gpio_mode(GPIO_LCD_RST,GPIO_MODE_00);
5. mt_set_gpio_dir(GPIO_LCD_RST,GPIO_DIR_OUT);
6. mt_set_gpio_out(GPIO_LCD_RST,GPIO_OUT_ONE);
7. MDELAY(1);
8. //SET_RESET_PIN(0);
9. mt_set_gpio_out(GPIO_LCD_RST,GPIO_OUT_ZERO);
10. MDELAY(10);
11. //SET_RESET_PIN(1);
12. mt_set_gpio_out(GPIO_LCD_RST,GPIO_OUT_ONE);
13. MDELAY(100);
14. ...
15. }