【资料图】
一. 简介
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pi屏调试一般都要在RK平台的dts中配置屏幕上电初始化时序 ：panel-init-sequence和下电初始化时序：panel-exit-sequence。本文讲解如何配置屏幕的这些初始化时序。专栏总目录
二. 数据类型：Data Type
2.1 常见数据类型 1 ：DCS Write
注意：这里的parameter并不是指数据字节个数
0x05 命令类型: 单字节数据 (DCS Short Write, no parameters)0x15 命令类型: 双字节数据 (DCS Short Write, 1 parameter)0x39 命令类型: 多字节数据 (DCS Long Write, n parameters n > 2)
0x05 命令类型：(DCS Short Write, no parameters)
05 95 01 1105 95 01 29
0x15 命令类型：(DCS Short Write, 1 parameter)
15 00 02 80 77| | | | || | | | 数据| | | | 寄存器地址| | 数据长度| 延时命令类型（0x05: 单字节数据 0x15: 双字节数据 0x39: 多字节数据）解析：Data Type：0x15 ( 0x15格式的数据类型 DCS Short Write, 1 parameter)Delay：0x00 ( 延时，表示当前 Packet 发送完成之后，需要延时多少 ms，再开始发送下一条命令 )PayloadLength：0x02 ( Packet 的有效负载长度为2 Bytes，数据字节个数为2 )Payload: 0x80 0x77 ( Payload 数据 )
0x39 命令类型是带多个参数,大于两个参数 (DCS Long Write / write_LUT Command Packet)
39 00 06 FF 77 01 00 00 1039 00 03 C0 63 0039 00 03 C1 11 02
2.2 常见数据类型 2 ：Generic Write
注意：这里的parameter并不是指数据字节个数
0x03 命令类型： 单字节数据 (Generic Short Write, no parameters)0x13 命令类型： 双字节数据 (Generic Short Write, 1 parameter)0x23 命令类型： 三字节数据 (Generic Short Write, 2 parameters)0x29 命令类型： 多字节数据 (Generic Long Write, n parameters n > 2)
三. RK平台上电初始化时序配置
屏厂给的MIPI屏初始化代码：
params- >dsi.vertical_sync_active=2params- >dsi.vertical_backporch=10params- >dsi.vertical_frontporch=14params- >dsi.horizontal_sync_active=24params- >dsi.horizontal_backporch=80params- >dsi.horizontal_frontporch=60params- >dsi.PLL_CLOCK=478 LCD_nReset=1;Delayms(5);LCD_nReset=0;Delayms(20);//10LCD_nReset=1;Delayms(200);//120Generic_Short_Write_1P(0xB0,0x01);Generic_Short_Write_1P(0xC0,0x26);Generic_Short_Write_1P(0xC1,0x10);Generic_Short_Write_1P(0xC2,0x0E);Generic_Short_Write_1P(0xC3,0x00);Generic_Short_Write_1P(0xC4,0x00);Generic_Short_Write_1P(0xC5,0x23);Generic_Short_Write_1P(0xC6,0x11);Generic_Short_Write_1P(0xC7,0x22);Generic_Short_Write_1P(0xC8,0x20);Generic_Short_Write_1P(0xC9,0x1E);Generic_Short_Write_1P(0xCA,0x1C);Generic_Short_Write_1P(0xCB,0x0C);Generic_Short_Write_1P(0xCC,0x0A);Generic_Short_Write_1P(0xCD,0x08);Generic_Short_Write_1P(0xCE,0x06);Generic_Short_Write_1P(0xCF,0x18);Generic_Short_Write_1P(0xD0,0x02);Generic_Short_Write_1P(0xD1,0x00);Generic_Short_Write_1P(0xD2,0x00);Generic_Short_Write_1P(0xD3,0x00);Generic_Short_Write_1P(0xD4,0x26);Generic_Short_Write_1P(0xD5,0x0F);Generic_Short_Write_1P(0xD6,0x0D);Generic_Short_Write_1P(0xD7,0x00);Generic_Short_Write_1P(0xD8,0x00);Generic_Short_Write_1P(0xD9,0x23);Generic_Short_Write_1P(0xDA,0x11);Generic_Short_Write_1P(0xDB,0x21);Generic_Short_Write_1P(0xDC,0x1F);Generic_Short_Write_1P(0xDD,0x1D);Generic_Short_Write_1P(0xDE,0x1B);Generic_Short_Write_1P(0xDF,0x0B);Generic_Short_Write_1P(0xE0,0x09);Generic_Short_Write_1P(0xE1,0x07);Generic_Short_Write_1P(0xE2,0x05);Generic_Short_Write_1P(0xE3,0x17);Generic_Short_Write_1P(0xE4,0x01);Generic_Short_Write_1P(0xE5,0x00);Generic_Short_Write_1P(0xE6,0x00);Generic_Short_Write_1P(0xE7,0x00);Generic_Short_Write_1P(0xB0,0x03);Generic_Short_Write_1P(0xBE,0x04);Generic_Short_Write_1P(0xB9,0x40);Generic_Short_Write_1P(0xCC,0x88);Generic_Short_Write_1P(0xC8,0x0C);Generic_Short_Write_1P(0xC9,0x07);Generic_Short_Write_1P(0xCD,0x01);Generic_Short_Write_1P(0xCA,0x40);Generic_Short_Write_1P(0xCE,0x1A);Generic_Short_Write_1P(0xCF,0x60);Generic_Short_Write_1P(0xD2,0x08);Generic_Short_Write_1P(0xD3,0x08);Generic_Short_Write_1P(0xDB,0x01);Generic_Short_Write_1P(0xD9,0x06);Generic_Short_Write_1P(0xD4,0x00);Generic_Short_Write_1P(0xD5,0x01);Generic_Short_Write_1P(0xD6,0x04);Generic_Short_Write_1P(0xD7,0x03);Generic_Short_Write_1P(0xC2,0x00);Generic_Short_Write_1P(0xC3,0x0E);Generic_Short_Write_1P(0xC4,0x00);Generic_Short_Write_1P(0xC5,0x0E);Generic_Short_Write_1P(0xDD,0x00);Generic_Short_Write_1P(0xDE,0x0E);Generic_Short_Write_1P(0xE6,0x00);Generic_Short_Write_1P(0xE7,0x0E);Generic_Short_Write_1P(0xC2,0x00);Generic_Short_Write_1P(0xC3,0x0E);Generic_Short_Write_1P(0xC4,0x00);Generic_Short_Write_1P(0xC5,0x0E);Generic_Short_Write_1P(0xDD,0x00);Generic_Short_Write_1P(0xDE,0x0E);Generic_Short_Write_1P(0xE6,0x00);Generic_Short_Write_1P(0xE7,0x0E);Generic_Short_Write_1P(0xB0,0x06);Generic_Short_Write_1P(0xC0,0xA5);Generic_Short_Write_1P(0xD5,0x1C);Generic_Short_Write_1P(0xC0,0x00);Generic_Short_Write_1P(0xB0,0x00);Generic_Short_Write_1P(0xBD,0x30);//VCOM 37Generic_Short_Write_1P(0xF9,0x5C);Generic_Short_Write_1P(0xC2,0x14);Generic_Short_Write_1P(0xC4,0x14);Generic_Short_Write_1P(0xBF,0x15);Generic_Short_Write_1P(0xC0,0x0C);Generic_Short_Write_1P(0xB0,0x00);Generic_Short_Write_1P(0xB1,0x79);Generic_Short_Write_1P(0xBA,0x8F);// DCS_Short_Write_NP(0x11); Delay(200); DCS_Short_Write_NP(0x29); Delay(50);
3.1 分析客户给的mipi屏初始化代码：
Generic_Short_Write_1P(0xBA,0x8F);Generic_Short_Write_1P表示：发送Generic命令，带1个参数，数据字节个数为2(Generic Short Write, 1 parameter)0xBA：寄存器地址0x8F：数据1为0x8F
在DTS上转成RK上的mipi屏初始化格式13 00 02 BA 8F解析：13 表示0x13数据类型的指令00 表示没有延时02 表示两个数据长度 ：0xBA,0x8FBA 表示寄存器地址0xBA8F 表示0x8F这个数据
分析客户给的mipi屏初始化代码：DCS_Short_Write_NP(0x11); Delay(200); DCS_Short_Write_NP(0x29); Delay(50); 解析： DCS_Short_Write_NP表示：只发送DCS命令，不带参数，数据字节个数为1。(DCS Short Write, no parameters) 0x11：数据1为0x11 Delay(200)：延迟为200
在DTS上转成RK上的mipi屏初始化格式05 C8 01 1105 32 01 29解析：05 表示0x05数据类型的指令C8 表示延时为200 转换成16进制为0xC801 表示1个数据长度 ：0x1111 表示数据：0x11
3.2 将屏厂的初始化代码转换成RK平台的屏幕上电初始化时序DTS配置：
panel-init-sequence = [13 00 02 B0 0113 00 02 C0 2613 00 02 C1 1013 00 02 C2 0E13 00 02 C3 0013 00 02 C4 0013 00 02 C5 2313 00 02 C6 1113 00 02 C7 2213 00 02 C8 2013 00 02 C9 1E13 00 02 CA 1C13 00 02 CB 0C13 00 02 CC 0A13 00 02 CD 0813 00 02 CE 0613 00 02 CF 1813 00 02 D0 0213 00 02 D1 0013 00 02 D2 0013 00 02 D3 0013 00 02 D4 2613 00 02 D5 0F13 00 02 D6 0D13 00 02 D7 0013 00 02 D8 0013 00 02 D9 2313 00 02 DA 1113 00 02 DB 2113 00 02 DC 1F13 00 02 DD 1D13 00 02 DE 1B13 00 02 DF 0B13 00 02 E0 0913 00 02 E1 0713 00 02 E2 0513 00 02 E3 1713 00 02 E4 0113 00 02 E5 0013 00 02 E6 0013 00 02 E7 0013 00 02 B0 0313 00 02 BE 0413 00 02 B9 4013 00 02 CC 8813 00 02 C8 0C13 00 02 C9 0713 00 02 CD 0113 00 02 CA 4013 00 02 CE 1A13 00 02 CF 6013 00 02 D2 0813 00 02 D3 0813 00 02 DB 0113 00 02 D9 0613 00 02 D4 0013 00 02 D5 0113 00 02 D6 0413 00 02 D7 0313 00 02 C2 0013 00 02 C3 0E13 00 02 C4 0013 00 02 C5 0E13 00 02 DD 0013 00 02 DE 0E13 00 02 E6 0013 00 02 E7 0E13 00 02 C2 0013 00 02 C3 0E13 00 02 C4 0013 00 02 C5 0E13 00 02 DD 0013 00 02 DE 0E13 00 02 E6 0013 00 02 E7 0E13 00 02 B0 0613 00 02 C0 A513 00 02 D5 1C13 00 02 C0 0013 00 02 B0 0013 00 02 BD 3013 00 02 F9 5C13 00 02 C2 1413 00 02 C4 1413 00 02 BF 1513 00 02 C0 0C13 00 02 B0 0013 00 02 B1 7913 00 02 BA 8F05 C8 01 1105 32 01 29];panel-exit-sequence = [05 00 01 2805 00 01 10];
审核编辑：汤梓红
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