luckfox-pico-max使用framebuffer驱动ili9431芯片的LCD，使用LVGL显示

tao_sc

已于 2024-09-21 10:35:55 修改

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分类专栏： LuckFox-RV1106 文章标签： linux 驱动开发

于 2024-07-08 08:41:03 首次发布

本文链接：https://blog.youkuaiyun.com/tao_sc/article/details/140257776

1.1内核设置

进入内核目录。

cd /SDK目录/sysdrv/source/kernel
cp ./arch/arm/configs/luckfox_rv1106_linux_defconfig .config
make ARCH=arm menuconfig

在内核中依次开启FB相关的驱动

CONFIG_VT_CONSOLE=y
CONFIG_FRAMEBUFFER_CONSOLE=y
CONFIG_FONTS=y

将编译芯片对应驱动程序选项打开：默认是打开st7735R和ST7789v，对应程序在/luckfox-pico/sysdrv/source/kernel/drivers/staging/fbtft文件夹内，如果没有对应芯片驱动程序，则自行添加
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保存配置

make ARCH=arm savedefconfig
cp defconfig arch/arm/configs/luckfox_rv1106_linux_defconfig

1.2 设备树文件

要驱动 LCD，除了在内核中启用 FB 相关驱动程序外，还必须确保所有与 LCD 通讯的引脚功能正常。在此之前，我们需要确定 Pico-LCD-1.3 与 Luckfox Pico Pro/Max 的连接引脚。设备树用于描述硬件资源，因此需要对设备树进行相应的修改。

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按键相关的引脚如果没使用可以不设置

1.2.2设备树编写

在默认的设备树中， GPIO1_C7_d 的默认功能是 PWM 功能，在程序中，我们希望通过读取该引脚电平判断按键状态，所以我们需要将该引脚配置为普通IO。打开<SDK目录>/sysdrv/source/kernel/arch/arm/boot/dts/rv1106g-luckfox-pico-pro-max.dts

/{
   
   
    gpio1pc7:gpio1pc7 {
   
   
        compatible = "regulator-fixed";
        pinctrl-names = "default";
        pinctrl-0 = <&gpio1_pc7>;
        regulator-name = "gpio1_pc7";
        regulator-always-on;
    };
};

&pinctrl {
   
   
    gpio1-pc7 {
   
   
        gpio1_pc7:gpio1-pc7 {
   
   
            rockchip,pins = <1 RK_PC7 RK_FUNC_GPIO &pcfg_pull_up>;
        };
    };
};

SPI 配置需要禁用spidev@0，否则fb无法进行初始化。
如果是st7789v等其它芯片，则将ili9341@0改为芯片名@0，如st7789@0
compatible改为"sitronix,st7789v"

&spi0 {
   
   
	status = "okay";
	pinctrl-names = "default";
	pinctrl-0 = <&spi0m0_cs0 &spi0m0_pins>;			
	spidev@0 {
   
   //一定要禁用
		status = "disabled";
	};
	ili9341@0{
   
   						
		status = "okay";
		compatible = "ilitek,ili9341"; 
		reg = <0>;			
		spi-max-frequency = <20000000>;			
		fps = <30>;
		buswidth = <8>;
		debug = <0x7>;
		led-gpios = <&gpio2 RK_PB0 GPIO_ACTIVE_LOW>;//BL
		dc = <&gpio2 RK_PB1 GPIO_ACTIVE_HIGH>;		//DC
		reset = <&gpio1 RK_PC3 GPIO_ACTIVE_LOW>;	//RES
	};
};

&pinctrl {
   
   
    spi0 {
   
   
        /omit-if-no-ref/
        spi0m0_pins: spi0m0-pins {
   
   
            rockchip,pins =
                /* spi0_clk_m0 */
                <1 RK_PC1 4 &pcfg_pull_none>,
                /* spie_miso_m0 */
                // <1 RK_PC3 6 &pcfg_pull_none>,
                /* spi_mosi_m0 */
                <1 RK_PC2 6 &pcfg_pull_none>;
        };
    };
};

完整dts文件如下：

// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
 * Copyright (c) 2022 Rockchip Electronics Co., Ltd.
 */

/dts-v1/;

#include "rv1106.dtsi"
#include "rv1106-evb.dtsi"
#include "rv1106-luckfox-pico-pro-max-ipc.dtsi"

/ {
   
   
	model = "Luckfox Pico Max";
	compatible = "rockchip,rv1103g-38x38-ipc-v10", "rockchip,rv1106";

	/*LCD_BL*/
	gpio2pb0:gpio2pb0 {
   
   
		compatible = "regulator-fixed";
		pinctrl-names = "default";
		pinctrl-0 = <&gpio2_pb0>;
		regulator-name = "gpio2_pb0";
		regulator-always-on;
	};

	/*LCD_DC*/
    gpio2pb1:gpio2pb1 {
   
   
		compatible = "regulator-fixed";
		pinctrl-names = "default";
		pinctrl-0 = <&gpio2_pb1>;
		regulator-name = "gpio2_pb1";
		regulator-always-on;
	};

	/*LCD_RES*/
    gpio1pc3:gpio1pc3 {
   
   
        compatible = "regulator-fixed";
        pinctrl-names = "default";
        pinctrl-0 = <&gpio1_pc3>;
        regulator-name = "gpio1_pc3";
        regulator-always-on;
    };

	/*KEY*/
	gpio2pa0:gpio2pa0 {
   
   
		compatible = "regulator-fixed";
		pinctrl-names = "default";
		pinctrl-0 = <&gpio2_pa0>;
		regulator-name = "gpio2_pa0";
		regulator-always-on;
	};

	gpio2pa1:gpio2pa1 {
   
   
		compatible = "regulator-fixed";
		pinctrl-names = "default";
		pinctrl-0 = <&gpio2_pa1>;
		regulator-name = "gpio2_pa1";
		regulator-always-on;
	};

	gpio2pa2:gpio2pa2 {
   
   
		compatible = "regulator-fixed";
		pinctrl-names = "default";
		pinctrl-0 = <&gpio2_pa2>;
		regulator-name = "gpio2_pa2";
		regulator-always-on;
	};

	gpio2pa3:gpio2pa3 {
   
   
		compatible = "regulator-fixed";
		pinctrl-names = "default";
		pinctrl-0 = <&gpio2_pa3>;
		regulator-name = "gpio2_pa3";
		regulator-always-on;
	};
	
	gpio2pa4:gpio2pa4 {
   
   
		compatible = "regulator-fixed";
		pinctrl-names = "default";
		pinctrl-0 = <&gpio2_pa4>;
		regulator-name = "gpio2_pa4";
		regulator-always-on;
	};

	gpio2pa5:gpio2pa5 {
   
   
		compatible = "regulator-fixed";
		pinctrl-names = "default";
		pinctrl-0 = <&gpio2_pa5&g