概述
屏是嵌入式驱动开发中常见的设备,一般的带屏项目中最开始要调试的,简单记录一下自己在项目开发中的经验过程。所用平台是rockchip的rk3568,android11。
1.硬件原理图
硬件原理图主要看接的是哪个mipi接口,屏的电源控制io,背光控制io,这些需要在设备树中配置的要仔细核对。文章来源:https://www.toymoban.com/news/detail-662462.html
2.dts参考:
&dsi1_in_vp1 {
status = "okay";
};
&dsi1 {
status = "okay";
//rockchip,lane-rate = <1000>;
dsi1_panel: panel@0 {
status = "okay";
reg = <0>;
compatible = "simple-panel-dsi";
power-supply = <&vcc3v3_lcd1_n>;
reset-gpios = <&gpio4 RK_PC6 GPIO_ACTIVE_LOW>;
pinctrl-names = "default";
pinctrl-0 = <&lcd1_rst_gpio>;
backlight = <&backlight>;
reset-delay-ms = <60>;
enable-delay-ms = <60>;
prepare-delay-ms = <60>;
unprepare-delay-ms = <60>;
disable-delay-ms = <60>;
dsi,flags = <(MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_EOT_PACKET)>;
dsi,format = <MIPI_DSI_FMT_RGB888>;
dsi,lanes = <4>;
panel-init-sequence = [
05 78 01 11
05 1E 01 29
];
panel-exit-sequence = [
05 00 01 28
05 00 01 10
];
disp_timings1: display-timings {
native-mode = <&dsi1_timing0>;
dsi1_timing0: timing0 {
clock-frequency = <132000000>;
hactive = <1200>;
vactive = <1920>;
hfront-porch = <80>;
hsync-len = <1>;
hback-porch = <60>;
vfront-porch = <35>;
vsync-len = <1>;
vback-porch = <25>;
hsync-active = <0>;
vsync-active = <0>;
de-active = <0>;
pixelclk-active = <1>;
};
};
ports {
#address-cells = <1>;
#size-cells = <0>;
port@0 {
reg = <0>;
panel_in_dsi1: endpoint {
remote-endpoint = <&dsi1_out_panel>;
};
};
};
};
ports {
#address-cells = <1>;
#size-cells = <0>;
port@1 {
reg = <1>;
dsi1_out_panel: endpoint {
remote-endpoint = <&panel_in_dsi1>;
};
};
};
};
&video_phy0 {
status = "disabled";
};
&video_phy1 {
status = "okay";
};
&route_dsi1 {
status = "okay";
connect = <&vp1_out_dsi1>;
};
PS:以上代码只是参考,并不完整。还有io的配置,包括是否有管脚复用等。
panel-init-sequence 和 panel-exit-sequence是mipi屏的初始化命令,timing0是屏的一些参数。一般是屏厂提供。格式就按照mipi的cmd格式来写。正常情况上电可以点亮屏幕了。如果出了问题,也有调试命令可以查看clk,dsi这些通道是否正常。
rk平台的点屏方式还是比较简洁的,直接在dts中完成。有些平台是需要增加代码实现的。不过原理都差不多。最后,祝大家都能点屏成功。文章来源地址https://www.toymoban.com/news/detail-662462.html
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