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
- LEDA
- LEDK
- VCC 2.8
- RESET
- NC
- NC
- NC
- VCCIO 1.8
- GND
- DATA0_P
- TE
- DATA0_N
- NC
- GND
- GND
- CLK_P
- NC
- CLK_N
- NC
- 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);
