IMX6ULL開發板spi OLED驅動

xjxcxjx發表於2024-06-24

本文是IMX6ULL開發板spi OLED驅動學習筆記，方便後面檢視時快速的回顧，而不需要一點點的看影片

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

影片選集：P141 - P150

1、將檔案上傳到虛擬機器共享目錄
file

2、make編譯出驅動
file

3、修改裝置樹

vim 100ask_imx6ull-14x14.dts
file

&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>;
    };
		```
編譯裝置樹：
![file](https://img2024.cnblogs.com/other/1742799/202406/1742799-20240624104757076-887665210.png)
注意：必須退回到linux核心目錄裡編譯

將裝置樹檔案放到共享目錄：

`cp arch/arm/boot/dts/100ask_imx6ull-14x14.dts /home/book/nfs_rootfs/`

4、替換裝置樹

進入開發板，將裝置樹複製到/boot之後重啟

`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、驗證裝置樹

進入裝置樹查詢oled 

`cd /sys/firmware/devicetree/base`

`find -name "*oled*"`
![file](https://img2024.cnblogs.com/other/1742799/202406/1742799-20240624104757448-75871267.png)

進入oled目錄檢視：

`cd ./soc/aips-bus@02000000/spba-bus@02000000/ecspi@02008000/oled`
![file](https://img2024.cnblogs.com/other/1742799/202406/1742799-20240624104757615-2008571055.png)

6、安裝驅動

·insmod oled_drv.ko·
![file](https://img2024.cnblogs.com/other/1742799/202406/1742799-20240624104757784-1206741841.png)

7、執行oled_test驗證

`./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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