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RK3288的LCD调试,根据屏幕规格书对dts作相应的修改基本都可点亮,配置也较为简单
Platform : Rockchip Soc : RK3288 System : linux(buidroot) IC:NT35523 内核:4.4 先做一些准备工作,多看看LCD的手册 提炼出来关键信息是: Hactive = 800 ,水平分辨率 Vactive = 2560 ,垂直分辨率 Lanes = 4 ,Mipi data 信号线通道数 硬件上,复位信号的时序要对: 主要参数的提取: 关键信息提炼出来: 4 data lines(厂家推荐值): Hactive = 800 HFP = 40 HBP = 20 Hsync = 20 Vactive = 1280 VFP = 20 VBP = 20 VSync = 10 clock-frequency = (h_active + hfp + hbp + h_sync) * (v_active + vfp + vbp + v_sync) * fps 厂商给参考值60Hz, fps= clk/ (800 + 40 + 20 +20) * (1280 + 20 + 20 + 10) = 60Hz Pixel Clock Frequency(Pclk)= 70.22MHZ 这里我们详细说一下各个参数的含义,这个对我们后续调屏会非常有帮助。 另外根据以上的信息,我们还能计算出 Mipi Dsi Clock 。 DCLK = 100 + H_total×V_total × fps × 3 × 8 / lanes_nums total 这里指的是 sync + front + back + active 比如 H_total = Hsync + HFP(hfront-proch) + HBP(hback-porch) + Hactive fps 指的是帧率,一般我们按照 60 帧来计算 3 × 8 代表一个 RGB 为 3 个字节,每个字节 8 bit lanes 代表 mipi data 通道数 所以对于我这个屏 DCLK = 100Mbps + H_Total × V_Total x fps x 3 x 8 / lanes_nums = 100 + ( 800 + 40 + 20 + 20 ) x ( 1280 + 20 + 20+ 10 ) x 60 帧 x 3 字节 x 8 bit / 4 lanes = 100Mbps + 421Mbps = 521 Mbps MIPI CLK Lane * 2 = MIPI DATA Lane 原理图,GPIO的配置: 现在附上设备树中dts文件LCD部分的代码: +/*************add by lml start*********************/ + + +&dsi0 { + status = "okay"; + + panel@0 { + compatible = "simple-panel-dsi"; + reg = <0>; + backlight = <&backlight>; + // enable-gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>; + reset-gpios = <&gpio6 5 GPIO_ACTIVE_LOW>; + + prepare-delay-ms = <120>; + reset-delay-ms = <120>; + init-delay-ms = <120>; + enable-delay-ms = <120>; + unprepare-delay-ms = <120>; + disable-delay-ms = <120>; + + width-mm = <113>; + height-mm = <181>; + + dsi,flags = <(MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | + MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_EOT_PACKET)>; + dsi,format = + dsi,lanes = <4>; + + panel-init-sequence = [ + 39 00 06 f0 55 aa 52 08 00 + 39 00 0a c0 00 00 00 00 00 00 00 00 02 + 15 00 02 c8 80 + 39 00 03 b1 e8 21 + 39 00 03 b5 05 00 + 39 00 03 bb 93 93 + 39 00 03 bc 0f 00 + 39 00 05 bd 11 30 10 10 + 39 00 06 f0 55 aa 52 08 01 + 15 00 02 ce 00 + 39 00 03 b7 00 48 + 15 00 02 ce 00 + 15 00 02 ca 03 + 39 00 03 b3 23 23 + 39 00 03 b4 23 23 + 39 00 03 c3 5a 5a + 39 00 03 c4 5a 5a + 39 00 03 c2 5a 5a + 39 00 03 b9 44 44 + 39 00 03 ba 24 24 + 39 00 03 bc 50 00 + 39 00 03 bd 50 00 + 39 00 03 be 00 71 + 39 00 03 bf 00 a0 + 39 00 06 f0 55 aa 52 08 02 + 15 00 02 b0 40 + 39 00 11 d1 00 00 00 1b 00 40 00 5b 00 71 00 97 00 b5 00 e6 + 39 00 11 d2 01 0d 01 4b 01 7c 01 c8 02 03 02 05 02 3a 02 72 + 39 00 11 d3 02 95 02 c5 02 e7 03 15 03 32 03 57 03 71 03 95 + 39 00 05 d4 03 b0 03 b3 + 39 00 06 f0 55 aa 52 08 03 + 39 00 05 b0 00 00 00 00 + 39 00 05 b1 00 00 00 00 + 39 00 08 b2 00 00 0a 06 00 f0 5b + 39 00 08 b3 00 00 09 06 00 f0 5b + 39 00 0b b6 f0 05 06 03 00 00 00 00 10 10 + 39 00 0b b7 f0 05 07 03 00 00 00 00 10 10 + 39 00 08 bc c5 03 00 08 00 f0 5b + 39 00 03 c4 00 00 + 39 00 06 f0 55 aa 52 08 05 + 39 00 05 b0 33 04 00 01 + 39 00 03 b1 40 00 + 39 00 04 b2 03 02 22 + 39 00 05 b3 83 23 42 9a + 39 00 05 b4 c5 35 77 53 + 39 00 08 b5 4c e5 31 33 33 a3 0a + 39 00 07 b6 00 00 d5 31 77 53 + 39 00 06 b9 00 00 00 05 00 + 39 00 06 c0 35 33 33 50 05 + 39 00 05 c6 00 00 00 00 + 39 00 03 ce f0 1f + 39 00 06 d2 00 25 02 00 00 + 39 00 03 e7 e8 ff + 39 00 03 e8 ff ff + 15 00 02 e9 00 + 15 00 02 ea aa + 15 00 02 eb aa + 15 00 02 ec aa + 15 00 02 ee aa + 39 00 06 f0 55 aa 52 08 06 + 39 00 06 b0 7d 4a 7d 7d 7d + 39 00 06 b1 7d 7d 42 5d 7d + 39 00 06 b2 7d 63 61 7d 7d + 39 00 06 b3 5f 72 7d 7d 7d + 39 00 03 b4 7d 7d + 39 00 06 b5 7d 48 7d 7d 7d + 39 00 06 b6 7d 7d 40 5c 7d + 39 00 06 b7 7d 62 60 7d 7d + 39 00 06 b8 5e 72 7d 7d 7d + 39 00 03 b9 7d 7d + 15 00 02 35 00 + 05 96 01 11 + 05 96 01 29 + ]; + + panel-exit-sequence = [ + 05 00 01 28 + 05 78 01 10 + ]; + + display-timings { + native-mode = <&timing0>; + + timing0: timing0 { + clock-frequency = <66000000>; + hactive = <1280>; + vactive = <800>; + hback-porch = <20>; + hsync-len = <10>; + hfront-porch = <40>; + vback-porch = <20>; + vfront-porch = <20>; + vsync-len = <10>; + hsync-active = <0>; + vsync-active = <0>; + de-active = <0>; + pixelclk-active = <0>; + }; + }; + }; +}; + + +&dsi0_in_vopl { + status = "disabled"; +}; + +&dsi0_in_vopb { + status = "okay"; +}; + +&route_dsi0 { + connect = <&vopb_out_dsi0>; + status = "okay"; +}; + +/*************add by lml end*********************/ 初始化代码解析(MIPI必须有初始化代码才能点亮,这个有原厂提供): panel-init-sequence = [ 39 00 06 f0 55 aa 52 08 00 .................................................. 05 96 01 29 ]; 说明:前 3 个字节(16 进制),分别代表 Data Type,Delay,Payload Length。 从第四个字节开始的数据代表长度为 Length 的实际有效 Payload。 第一条命令的解析如下: 39 00 06 f0 55 aa 52 08 00 Data Type:0x39 (DCS Long Write) Delay:0x00 (0 ms) Payload Length:0x06 (4 Bytes) Payload:f0 55 aa 52 08 00 最后一条命令的解析如下: 05 96 01 29 Data Type:0x05 (DCS Short Write, no parameters) Delay:0x96 (150 ms) Payload Length:0x01 (1 Bytes) Payload:0x29 |
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