LPC55S69-EVK开发板__ 让TFT显示屏亮起来

jinglixixi

受物趣系列的感召开始学习LPC55S69-EVK开发板的使用，首先要做的就是让显示屏亮起来。且显示屏的尺寸要尽量合适。太小显示的内容不易分辨，太大的话若显示屏的分辨率比高，就需要有较高的刷新速度，否则会由于显示的原因而开销较多的时间，会影响到对摄像头获取数据的相应。

这里选用的是SPI接口的2.2'串口屏，为便于灵活地选用引脚，特以GPIO口模拟SPI通讯的方式来驱动该显示屏的显示。

该显示屏与MCU的连接关系如下：

SCK---PIO1_20

SDI---PIO1_21

D/C---PIO1_2

RST---PIO1_3

CS ---PIO0_26

LED---PIO1_1

相关引脚输出高低电平的语句定义为：

#define LCD_SCK_Low()   GPIO_PinWrite(GPIO, 1u, 20u, 0) //CLK

#define LCD_SCK_High()  GPIO_PinWrite(GPIO, 1u, 20u, 1)

#define LCD_SDI_Low()   GPIO_PinWrite(GPIO, 1u, 21u, 0) //DIN

#define LCD_SDI_High()  GPIO_PinWrite(GPIO, 1u, 21u, 1)

#define LCD_REST_Low()  GPIO_PinWrite(GPIO, 1u, 2u, 0) //RES

#define LCD_REST_High() GPIO_PinWrite(GPIO,1u, 2u, 1)

#define LCD_DC_Low()    GPIO_PinWrite(GPIO, 1u, 3u, 0) //DC

#define LCD_DC_High()   GPIO_PinWrite(GPIO, 1u, 3u, 1)

#define LCD_CS_Low()    GPIO_PinWrite(GPIO, 0u, 26u, 0) //CS

#define LCD_CS_High()   GPIO_PinWrite(GPIO, 0u, 26u, 1)

#define LCD_LED_Low()   GPIO_PinWrite(GPIO, 1u, 1u, 0) //BLK

#define LCD_LED_High()  GPIO_PinWrite(GPIO, 1u, 1u, 1)

配置相关引脚为输出功能的函数为：

1. void app_tft_init(void)
   
2. {
   
3. gpio_pin_config_t   gpioPinConfig;
   
4. gpioPinConfig.pinDirection = kGPIO_DigitalOutput;
   
5. gpioPinConfig.outputLogic  = 1u;
   
6. GPIO_PinInit (GPIO, 1u, 20u, &gpioPinConfig);
   
7. GPIO_PinInit (GPIO, 1u, 21u, &gpioPinConfig);
   
8. GPIO_PinInit (GPIO, 1u, 2u, &gpioPinConfig);
   
9. GPIO_PinInit (GPIO, 1u, 3u, &gpioPinConfig);
   
10. GPIO_PinInit (GPIO, 0u, 26u, &gpioPinConfig);
    
11. GPIO_PinInit (GPIO, 1u, 1u, &gpioPinConfig);
    
12. LCD_LED_High();
    
13. }

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TFT显示屏的初始化函数为：

1. void tft_Init(void)
   
2. {
   
3. LCD_REST_Low();
   
4. SysTick_DelayTicks(20);
   
5. LCD_REST_High();
   
6. SysTick_DelayTicks(20);
   
7. LCD_CS_Low();
   
8. LCD_WR_REG(0xCB);
   
9. LCD_WR_DATA8(0x39);
   
10. LCD_WR_DATA8(0x2C);
    
11. LCD_WR_DATA8(0x00);
    
12. LCD_WR_DATA8(0x34);
    
13. LCD_WR_DATA8(0x02);
    
14. LCD_WR_REG(0xCF);
    
15. LCD_WR_DATA8(0x00);
    
16. LCD_WR_DATA8(0XC1);
    
17. LCD_WR_DATA8(0X30);
    
18. LCD_WR_REG(0xE8);
    
19. LCD_WR_DATA8(0x85);
    
20. LCD_WR_DATA8(0x00);
    
21. LCD_WR_DATA8(0x78);
    
22. LCD_WR_REG(0xEA);
    
23. LCD_WR_DATA8(0x00);
    
24. LCD_WR_DATA8(0x00);
    
25. LCD_WR_REG(0xED);
    
26. LCD_WR_DATA8(0x64);
    
27. LCD_WR_DATA8(0x03);
    
28. LCD_WR_DATA8(0X12);
    
29. LCD_WR_DATA8(0X81);
    
30. LCD_WR_REG(0xF7);
    
31. LCD_WR_DATA8(0x20);
    
32. LCD_WR_REG(0xC0);
    
33. LCD_WR_DATA8(0x23);
    
34. LCD_WR_REG(0xC1);
    
35. LCD_WR_DATA8(0x10);
    
36. LCD_WR_REG(0xC5);
    
37. LCD_WR_DATA8(0x3e);
    
38. LCD_WR_DATA8(0x28);
    
39. LCD_WR_REG(0xC7);
    
40. LCD_WR_DATA8(0x86);
    
41. LCD_WR_REG(0x36);
    
42. LCD_WR_DATA8(0x48);
    
43. LCD_WR_REG(0x3A);
    
44. LCD_WR_DATA8(0x55);
    
45. LCD_WR_REG(0xB1);
    
46. LCD_WR_DATA8(0x00);
    
47. LCD_WR_DATA8(0x18);
    
48. LCD_WR_REG(0xB6);
    
49. LCD_WR_DATA8(0x08);
    
50. LCD_WR_DATA8(0x82);
    
51. LCD_WR_DATA8(0x27);
    
52. LCD_WR_REG(0xF2);
    
53. LCD_WR_DATA8(0x00);
    
54. LCD_WR_REG(0x26);
    
55. LCD_WR_DATA8(0x01);
    
56. LCD_WR_REG(0xE0);
    
57. LCD_WR_DATA8(0x0F);
    
58. LCD_WR_DATA8(0x31);
    
59. LCD_WR_DATA8(0x2B);
    
60. LCD_WR_DATA8(0x0C);
    
61. LCD_WR_DATA8(0x0E);
    
62. LCD_WR_DATA8(0x08);
    
63. LCD_WR_DATA8(0x4E);
    
64. LCD_WR_DATA8(0xF1);
    
65. LCD_WR_DATA8(0x37);
    
66. LCD_WR_DATA8(0x07);
    
67. LCD_WR_DATA8(0x10);
    
68. LCD_WR_DATA8(0x03);
    
69. LCD_WR_DATA8(0x0E);
    
70. LCD_WR_DATA8(0x09);
    
71. LCD_WR_DATA8(0x00);
    
72. LCD_WR_REG(0XE1);
    
73. LCD_WR_DATA8(0x00);
    
74. LCD_WR_DATA8(0x0E);
    
75. LCD_WR_DATA8(0x14);
    
76. LCD_WR_DATA8(0x03);
    
77. LCD_WR_DATA8(0x11);
    
78. LCD_WR_DATA8(0x07);
    
79. LCD_WR_DATA8(0x31);
    
80. LCD_WR_DATA8(0xC1);
    
81. LCD_WR_DATA8(0x48);
    
82. LCD_WR_DATA8(0x08);
    
83. LCD_WR_DATA8(0x0F);
    
84. LCD_WR_DATA8(0x0C);
    
85. LCD_WR_DATA8(0x31);
    
86. LCD_WR_DATA8(0x36);
    
87. LCD_WR_DATA8(0x0F);
    
88. LCD_WR_REG(0x11);
    
89. SysTick_DelayTicks(120);
    
90. LCD_WR_REG(0x29);
    
91. LCD_WR_REG(0x2c);
    
92. }

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显示屏显示图片的函数为：

1. void show_pic(const unsigned char *p)
   
2. {
   
3. int i,j;
   
4. unsigned char picH,picL;
   
5. Address_set(0,0,LCD_W-1,LCD_H-1);
   
6. for(i=0;i<240;i++)
   
7. {
   
8. for(j=0;j<320;j++)
   
9. {
   
10. picH=*p++;
    
11. picL=*p++;
    
12. LCD_WR_DATA8(picH);
    
13. LCD_WR_DATA8(picL);
    
14. }
    
15. }
    
16. }

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显示图1所示效果的主程序为:

1. int main(void)
   
2. {
   
3. volatile uint8_t s_KeyValue = 0;
   
4. POWER_SetBodVbatLevel(kPOWER_BodVbatLevel1650mv, kPOWER_BodHystLevel50mv, false);
   
5. BOARD_BootClockFROHF96M();
   
6. SystemCoreClockUpdate();
   
7. if (SysTick_Config(SystemCoreClock / 1000U))
   
8. {
   
9. while (1)
   
10. {
    
11. }
    
12. }
    
13. app_tft_init();
    
14. SysTick_DelayTicks(500);
    
15. tft_Init();
    
16. LCD_Clear(WHITE);
    
17. show_pic(gImage_123);
    
18. while(1);
    
19. }

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图1 图片显示效果

图2 功能界面显示效果

后续的任务可能会困难起来，因为手头的摄像头是当年很随意买的，是不带FIFO缓存的，不知在图像获取时是否能用，此外也没有相应的驱程，只好慢慢探索了！

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realjace

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jinglixixi

realjace 发表于 2020-11-11 22:38
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