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](/i/l/?n=24&i=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](/i/l/?n=24&i=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](/i/l/?n=24&i=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](/i/l/?n=24&i=other/1742799/202406/1742799-20240624104757615-2008571055.png)

6、安装驱动

·insmod oled_drv.ko·
![file](/i/l/?n=24&i=other/1742799/202406/1742799-20240624104757784-1206741841.png)

7、执行oled_test验证

`./oled_test /dev/myoled`
![file](/i/l/?n=24&i=other/1742799/202406/1742799-20240624104757969-1925996638.png)
![file](/i/l/?n=24&i=other/1742799/202406/1742799-20240624104758185-1460660820.png)
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