IMX6ULL开发板spi OLED驱动

本文是IMX6ULL开发板spi OLED驱动学习笔记，方便后面查看时快速的回顾，而不需要一点点的看视频

视频地址：
https://www.bilibili.com/video/BV1Yb4y1t7Uj?p=144&spm_id_from=pageDriver&vd_source=1d93d6a5e22d4b223c6c3ac4f5727eb8

视频选集：P141 - P150

1、将文件上传到虚拟机共享目录

2、make编译出驱动

3、修改设备树

vim 100ask_imx6ull-14x14.dts

&ecspi1 {pinctrl-names = "default";pinctrl-0 = <&pinctrl_ecspi1>;fsl,spi-num-chipselects = <2>;cs-gpios = <&gpio4 26 GPIO_ACTIVE_LOW>, <&gpio4 24 GPIO_ACTIVE_LOW>;status = "okay";oled: oled {compatible = "100ask,oled";reg = <0>;spi-max-frequency = <1000000>;dc-gpios = <&gpio4 20 GPIO_ACTIVE_HIGH>;};```
编译设备树：
![file](https://img2024.cnblogs.com/other/1742799/202406/1742799-20240624104757076-887665210.png)
注意：必须退回到linux内核目录里编译将设备树文件放到共享目录：`cp arch/arm/boot/dts/100ask_imx6ull-14x14.dts /home/book/nfs_rootfs/`4、替换设备树进入开发板，将设备树拷贝到/boot之后重启`mount -t nfs -o nolock,vers=3 192.168.5.11:/home/book/nfs_rootfs /mnt`
![file](https://img2024.cnblogs.com/other/1742799/202406/1742799-20240624104757278-526445394.png)5、验证设备树进入设备树查找oled `cd /sys/firmware/devicetree/base``find -name "*oled*"`
![file](https://img2024.cnblogs.com/other/1742799/202406/1742799-20240624104757448-75871267.png)进入oled目录查看：`cd ./soc/aips-bus@02000000/spba-bus@02000000/ecspi@02008000/oled`
![file](https://img2024.cnblogs.com/other/1742799/202406/1742799-20240624104757615-2008571055.png)6、安装驱动·insmod oled_drv.ko·
![file](https://img2024.cnblogs.com/other/1742799/202406/1742799-20240624104757784-1206741841.png)7、执行oled_test验证`./oled_test /dev/myoled`
![file](https://img2024.cnblogs.com/other/1742799/202406/1742799-20240624104757969-1925996638.png)
![file](https://img2024.cnblogs.com/other/1742799/202406/1742799-20240624104758185-1460660820.png)
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