飞凌瑞芯微3399 双路mipi拼接屏+HDMI 三屏显示
2021年04月13日 16:19 发布者:哦哈哟
MIPI-DSI双路mipi拼接屏
软件修改
根据手册提供的示意图可知,reset引脚需要先拉高,然后拉低保持tRESW时间,再拉高保持tREST时间,显示控制芯片就进入Initial Condition,这个时候我们就可以进行写初始化序列了。一般可以再找FAE确认一下reset的时序要求。
fdtdec_set_gpio(&panel->reset_gpio, 1); msleep(panel->delay_init); fdtdec_set_gpio(&panel->reset_gpio, 0); msleep(panel->delay_reset); fdtdec_set_gpio(&panel->reset_gpio, 1); msleep(panel->delay_enable);
在设备树中配置mipi屏的初始化序列,在dsi节点中配置panel-init-sequence数组序列
命令解析:
进一步分析,该命令前3个字节属于命令格式,后面“B9 FF 83 99”才是要传输的指令。
B9是要写入的命令,“FF 83 99”是该命令后面的3个参数。
&dsi { panel@0{ display-timings { native-mode = <&timing0>; timing0: timing0 { clock-frequency = <120000000>; hactive = <1080>; vactive = <1920>; hback-porch = <32>; hfront-porch = <32>; vback-porch = <10>; vfront-porch = <8>; hsync-len = <32>; vsync-len = <4>; hsync-active = <0>; vsync-active = <0>; de-active = <0>; pixelclk-active = <0>; }; }; };};
dual-channel
&dsi { status = "okay"; rockchip,dual-channel = <&dsi1>; panel@0{ dsi,lanes = <8>; display-timings { native-mode = <&timing1>; timing1: timing1 { clock-frequency = <240000000>; hactive = <2160>; vactive = <1920>; hback-porch = <64>; hfront-porch = <64>; vback-porch = <10>; vfront-porch = <8>; hsync-len = <64>; vsync-len = <4>; hsync-active = <0>; vsync-active = <0>; de-active = <0>; pixelclk-active = <0>; }; }; };};&dsi1 { status = "okay";};
修改完就可以点亮两块mipi屏了,效果如下:
https://img-blog.csdnimg.cn/20210330151928200.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Njb3R0bXZw,size_16,color_FFFFFF,t_70
https://img-blog.csdnimg.cn/20210330152144578.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Njb3R0bXZw,size_16,color_FFFFFF,t_70
两个MIPI使用了VOP BIG,VOP LITTLE还可以再支持一路HDMI显示。再插入HDMI,显示效果如下:
https://img-blog.csdnimg.cn/2021033015235987.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Njb3R0bXZw,size_16,color_FFFFFF,t_70
这样就可以实现瑞芯微教学视频中的三屏显示方案了,通过写app就可以做出三屏拼接显示或者三屏异显的方案。原文链接:https://www.forlinx.com/article_view_687.html