这个屏幕是给VerilogBoy实体机使用的屏幕，MIPI DSI接口，因为以前从来没有点过MIPI的屏幕，这里记录下过程方便以后参考。

基本信息

• 型号：AML-B16C15012Q
• 类型：RGB IPS TFT-LCD
• 模式：Normal Black
• 分辨率：320x320
• 灰度：接口支持8bpc，内部显存为6bpc，实际输出可能为6bpc
• 控制器：ST7796S
• 尺寸：1.54"
• 接口：MIPI 1-lane
• 背光：3并，VF=3.2V

接口定义

1. LEDA
2. LEDK
3. VCC 2.8
4. RESET
5. NC
6. NC
7. NC
8. VCCIO 1.8
9. GND
10. DATA0_P
11. TE
12. DATA0_N
13. NC
14. GND
15. GND
16. CLK_P
17. NC
18. CLK_N
19. NC
20. GND

笔记

• 时钟线最大频率500MHz，最低频率80MHz
• LP模式下DS要求每个状态保持时间为35-75ns，实测100ns也可行
• 0x2C通过LPDT无法正确写入数据（短包长包都不行），0x3C可行（仅限长包）

初始化

	Delay_ms(120); 
	 
	GP_COMMAD_PA(2);
	SPI_WriteData(0x36); // Memory data access control  
	SPI_WriteData(0x48); // Reverse X, BGR
	 
	GP_COMMAD_PA(2);
	SPI_WriteData(0x3A); // Interface pixel format
	SPI_WriteData(0x77); // 16.7M Color (not defined in DS???)
	 
	GP_COMMAD_PA(2);
	SPI_WriteData(0xF0); // Command Set Control
	SPI_WriteData(0xC3); // Enable Command 2 Part I
	 
	GP_COMMAD_PA(2);
	SPI_WriteData(0xF0); // Command Set Control
	SPI_WriteData(0x96); // Enable Command 2 Part II
	 
	GP_COMMAD_PA(3);
	SPI_WriteData(0xB1); // Frame Rate Control
	SPI_WriteData(0xA0); // FRS = 10 DIVA = 0 RTNA = 32
	SPI_WriteData(0x10); // FR = 10^7 / ((168+RTNA+32x(15-FRS))(320+VFP+VBP))
	 
	GP_COMMAD_PA(2);
	SPI_WriteData(0xB4); // Display Inversion Control
	SPI_WriteData(0x00); // 00: Column INV, 01: 1-Dot INV, 10: 2-Dot INV   
	 
	GP_COMMAD_PA(5);
	SPI_WriteData(0xB5); // Blacking Porch Control
	SPI_WriteData(0x40); // VFP = 64
	SPI_WriteData(0x40); // VBP = 64
	SPI_WriteData(0x00); // Reserved
	SPI_WriteData(0x04); // HBP = 4

	GP_COMMAD_PA(4);
	SPI_WriteData(0xB6); // Display Function Control
	SPI_WriteData(0x8A); // Bypass RAM, DE mode
	SPI_WriteData(0x07); // Non inverting
	SPI_WriteData(0x27); // 8*(0x27+1) = 320 lines
	 
	GP_COMMAD_PA(2);
	SPI_WriteData(0xB9); // There is no B9 in datasheet
	SPI_WriteData(0x02); 
	 
	GP_COMMAD_PA(2);
	SPI_WriteData(0xC5); // VCOM Control
	SPI_WriteData(0x2E); // 1.450V
	 
	GP_COMMAD_PA(9);
	SPI_WriteData(0xE8); // Display Output
	SPI_WriteData(0x40); 
	SPI_WriteData(0x8A); 
	SPI_WriteData(0x00); 
	SPI_WriteData(0x00); 
	SPI_WriteData(0x29); 
	SPI_WriteData(0x19); 
	SPI_WriteData(0xA5); 
	SPI_WriteData(0x93); 
	 
	GP_COMMAD_PA(15);
	SPI_WriteData(0xe0); // Positive Gamma Control
	SPI_WriteData(0xf0); 
	SPI_WriteData(0x07); 
	SPI_WriteData(0x0e); 
	SPI_WriteData(0x0a); 
	SPI_WriteData(0x08); 
	SPI_WriteData(0x25); 
	SPI_WriteData(0x38); 
	SPI_WriteData(0x43); 
	SPI_WriteData(0x51); 
	SPI_WriteData(0x38); 
	SPI_WriteData(0x14); 
	SPI_WriteData(0x12); 
	SPI_WriteData(0x32); 
	SPI_WriteData(0x3f); 

	GP_COMMAD_PA(15);
	SPI_WriteData(0xe1); // Negative Gamma Control
	SPI_WriteData(0xf0); 
	SPI_WriteData(0x08); 
	SPI_WriteData(0x0d); 
	SPI_WriteData(0x09); 
	SPI_WriteData(0x09); 
	SPI_WriteData(0x26); 
	SPI_WriteData(0x39); 
	SPI_WriteData(0x45); 
	SPI_WriteData(0x52); 
	SPI_WriteData(0x07); 
	SPI_WriteData(0x13); 
	SPI_WriteData(0x16); 
	SPI_WriteData(0x32); 
	SPI_WriteData(0x3f); 
	 
	GP_COMMAD_PA(2);
	SPI_WriteData(0xF0); // Command Set Control
	SPI_WriteData(0x3C); // Disable Command 2 Part I
	 
	GP_COMMAD_PA(2);
	SPI_WriteData(0xF0); // Command Set Control
	SPI_WriteData(0x69); // Disable Command 2 Part II
	 
	GP_COMMAD_PA(1),   
	SPI_WriteData(0x11); // Sleep Out
	Delay_ms(120);
	 
	GP_COMMAD_PA(1),   
	SPI_WriteData(0x29); // Display ON 
	Delay_ms(50);
	 
	GP_COMMAD_PA(1);
	SPI_WriteData(0x21); // Display Inversion ON
	
	
	GP_COMMAD_PA(5);
	SPI_WriteData(0x2A); // Column Address Set
	SPI_WriteData(0x00);   
	SPI_WriteData(0x00); 
	SPI_WriteData(0x01); 
	SPI_WriteData(0x3F); 
	 
	GP_COMMAD_PA(5);
	SPI_WriteData(0x2B); // Row Address Set
	SPI_WriteData(0x00);   
	SPI_WriteData(0x00); 
	SPI_WriteData(0x01); 
	SPI_WriteData(0x3F);