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    【R128】应用开发案例——适配SPI驱动ST7789V2.4寸LCD

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    r128开发指南
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    • livpo
      livpo LV 6 最后由 q1215200171 编辑

      基于R128-S2设计的全套开发板已上线淘宝百问网韦东山老师个人店进行售卖，包含黑色的DshanMCU-R128s2-R16N16模组和全套的DshanMCU-R128s2-DEVKIT。

      • DshanMCU-R128s2-R16N16模组：39.9元
      • DshanMCU-R128s2-DEVKIT开发板：59.9元

      R128开发板购买链接：https://item.taobao.com/item.htm?spm=a21n57.1.0.0.46b0523cMfarLo&id=736154682975&ns=1&abbucket=5#detail

      “主图_01”为智能对象-1.jpg

      SPI驱动ST7789V1.47寸LCD

      R128 平台提供了 SPI DBI 的 SPI TFT 接口，具有如下特点：

      • Supports DBI Type C 3 Line/4 Line Interface Mode
      • Supports 2 Data Lane Interface Mode
      • Supports data source from CPU or DMA
      • Supports RGB111/444/565/666/888 video format
      • Maximum resolution of RGB666 240 x 320@30Hz with single data lane
      • Maximum resolution of RGB888 240 x 320@60Hz or 320 x 480@30Hz with dual data lane
      • Supports tearing effect
      • Supports software flexible control video frame rate

      同时，提供了 SPILCD 驱动框架以供 SPI 屏幕使用。

      此次适配的SPI屏为 ZJY147S0800TG01，使用的是 SPI 进行驱动。

      image-20231023091543023.png

      引脚配置如下：

      R128 Devkit TFT 模块
      PA12 CS
      PA13 SCL
      PA18 SDA
      PA9 BLK
      PA20 RES
      PA19 DC
      3V3 VCC
      GND GND

      载入方案

      我们使用的开发板是 R128-Devkit，需要开发 C906 核心的应用程序，所以载入方案选择 r128s2_module_c906

      $ source envsetup.sh 
$ lunch_rtos 1

      image-20230802110150203 (7).png

      设置 SPI 驱动

      屏幕使用的是SPI驱动，所以需要勾选SPI驱动，运行 mrtos_menuconfig 进入配置页面。前往下列地址找到 SPI Devices

      Drivers Options  --->
    soc related device drivers  --->
        SPI Devices --->
        -*- enable spi driver

      image-20230825144134701 (3).png

      配置 SPI 引脚

      打开你喜欢的编辑器，修改文件：board/r128s2/module/configs/sys_config.fex，在这里我们不需要用到 SPI HOLD与SPI WP引脚，注释掉即可。

      ;----------------------------------------------------------------------------------
;SPI controller configuration
;----------------------------------------------------------------------------------
;Please config spi in dts
[spi1]
spi1_used       = 1
spi1_cs_number  = 1
spi1_cs_bitmap  = 1
spi1_cs0        = port:PA12<6><0><3><default>
spi1_sclk       = port:PA13<6><0><3><default>
spi1_mosi       = port:PA18<6><0><3><default>
spi1_miso       = port:PA21<6><0><3><default>
;spi1_hold       = port:PA19<6><0><2><default>
;spi1_wp         = port:PA20<6><0><2><default>

      image-20230825144205551 (2).png

      设置 PWM 驱动

      屏幕背光使用的是PWM驱动，所以需要勾选PWM驱动，运行 mrtos_menuconfig 进入配置页面。前往下列地址找到 PWM Devices

      Drivers Options  --->
    soc related device drivers  --->
        PWM Devices --->
        -*- enable pwm driver

      image-20230825144408144 (2).png

      配置 PWM 引脚

      打开你喜欢的编辑器，修改文件：board/r128s2/module/configs/sys_config.fex，增加 PWM1 节点

      [pwm1]
pwm_used        = 1
pwm_positive    = port:PA9<4><0><3><default>

      image-20230825150128954 (2).png

      设置 SPI LCD 驱动

      SPI LCD 由专门的驱动管理。运行 mrtos_menuconfig 进入配置页面。前往下列地址找到 SPILCD Devices ，注意同时勾选 spilcd hal APIs test 方便测试使用。

      Drivers Options  --->
    soc related device drivers  --->
        [*] DISP Driver Support(spi_lcd)
        [*]   spilcd hal APIs test

      image-20231023094633231.png

      编写 SPI LCD 显示屏驱动

      获取屏幕初始化序列

      首先询问屏厂提供驱动源码

      image-20231023094633231 (1).png )

      找到 LCD 的初始化序列代码

      image-20231017103842527 (1).png

      找到屏幕初始化的源码

      image-20231023094659100.png

      整理后的初始化代码如下：

      LCD_WR_REG(0x11);
delay_ms(120);
LCD_WR_REG(0x36);
LCD_WR_DATA8(0x00);

LCD_WR_REG(0x3A);
LCD_WR_DATA8(0x05);

LCD_WR_REG(0xB2);
LCD_WR_DATA8(0x0C);
LCD_WR_DATA8(0x0C);
LCD_WR_DATA8(0x00);
LCD_WR_DATA8(0x33);
LCD_WR_DATA8(0x33);

LCD_WR_REG(0xB7);
LCD_WR_DATA8(0x35);

LCD_WR_REG(0xBB);
LCD_WR_DATA8(0x35);

LCD_WR_REG(0xC0);
LCD_WR_DATA8(0x2C);

LCD_WR_REG(0xC2);
LCD_WR_DATA8(0x01);

LCD_WR_REG(0xC3);
LCD_WR_DATA8(0x13);

LCD_WR_REG(0xC4);
LCD_WR_DATA8(0x20);

LCD_WR_REG(0xC6);
LCD_WR_DATA8(0x0F);

LCD_WR_REG(0xD0);
LCD_WR_DATA8(0xA4);
LCD_WR_DATA8(0xA1);

LCD_WR_REG(0xD6);
LCD_WR_DATA8(0xA1);

LCD_WR_REG(0xE0);
LCD_WR_DATA8(0xF0);
LCD_WR_DATA8(0x00);
LCD_WR_DATA8(0x04);
LCD_WR_DATA8(0x04);
LCD_WR_DATA8(0x04);
LCD_WR_DATA8(0x05);
LCD_WR_DATA8(0x29);
LCD_WR_DATA8(0x33);
LCD_WR_DATA8(0x3E);
LCD_WR_DATA8(0x38);
LCD_WR_DATA8(0x12);
LCD_WR_DATA8(0x12);
LCD_WR_DATA8(0x28);
LCD_WR_DATA8(0x30);

LCD_WR_REG(0xE1);
LCD_WR_DATA8(0xF0);
LCD_WR_DATA8(0x07);
LCD_WR_DATA8(0x0A);
LCD_WR_DATA8(0x0D);
LCD_WR_DATA8(0x0B);
LCD_WR_DATA8(0x07);
LCD_WR_DATA8(0x28);
LCD_WR_DATA8(0x33);
LCD_WR_DATA8(0x3E);
LCD_WR_DATA8(0x36);
LCD_WR_DATA8(0x14);
LCD_WR_DATA8(0x14);
LCD_WR_DATA8(0x29);
LCD_WR_DATA8(0x32);

LCD_WR_REG(0x21);

LCD_WR_REG(0x11);
delay_ms(120);
LCD_WR_REG(0x29);

      用现成驱动改写 SPI LCD 驱动

      选择一个现成的 SPI LCD 改写即可，这里选择 nv3029s.c 驱动来修改

      image-20231017104714827 (1).png

      复制这两个驱动，重命名为 st7789v.c

      image-20231017104740060 (1).png

      先编辑 st7789v.h 将 nv3029s 改成 st7789v

      image-20231017104851772 (1).png

      #ifndef _ST7789V_H
#define _ST7789V_H

#include "panels.h"

struct __lcd_panel st7789v_panel;

#endif /*End of file*/

      编辑 st7789v.c 将 nv3029s 改成 st7789v

      image-20231017104942286 (1).png

      编写初始化序列

      先删除 static void LCD_panel_init(unsigned int sel) 中的初始化函数。

      image-20231017105101421 (1).png

      然后将屏厂提供的初始化序列复制进来

      image-20231023095000428.png

      然后按照 spi_lcd 框架的接口改写驱动接口，具体接口如下

      屏厂函数 SPILCD框架接口
      LCD_WR_REG sunxi_lcd_cmd_write
      LCD_WR_DATA8 sunxi_lcd_para_write
      delay_ms sunxi_lcd_delay_ms

      可以直接进行替换

      image-20231023095114146.png

      完成后如下

      image-20231023095158411.png

      然后对照屏厂提供的驱动修改 address 函数

      image-20231023100959968.png

      做如下修改

      static void address(unsigned int sel, int x, int y, int width, int height)
{
	sunxi_lcd_cmd_write(sel, 0x2A); /* Set coloum address */
	sunxi_lcd_para_write(sel, (x + 34) >> 8);
	sunxi_lcd_para_write(sel, (x + 34));
	sunxi_lcd_para_write(sel, (width + 34) >> 8);
	sunxi_lcd_para_write(sel, (width + 34));
	sunxi_lcd_cmd_write(sel, 0x2B); /* Set row address */
	sunxi_lcd_para_write(sel, y >> 8);
	sunxi_lcd_para_write(sel, y);
	sunxi_lcd_para_write(sel, height >> 8);
	sunxi_lcd_para_write(sel, height);
	sunxi_lcd_cmd_write(sel, 0x2c);
}

      完成驱动如下

      #include "st7789v.h"

static void LCD_power_on(u32 sel);
static void LCD_power_off(u32 sel);
static void LCD_bl_open(u32 sel);
static void LCD_bl_close(u32 sel);
static void LCD_panel_init(u32 sel);
static void LCD_panel_exit(u32 sel);
#define RESET(s, v) sunxi_lcd_gpio_set_value(s, 0, v)
#define power_en(sel, val) sunxi_lcd_gpio_set_value(sel, 0, val)

static struct disp_panel_para info[LCD_FB_MAX];

static void address(unsigned int sel, int x, int y, int width, int height)
{
	sunxi_lcd_cmd_write(sel, 0x2A); /* Set coloum address */
	sunxi_lcd_para_write(sel, (x + 34) >> 8);
	sunxi_lcd_para_write(sel, (x + 34));
	sunxi_lcd_para_write(sel, (width + 34) >> 8);
	sunxi_lcd_para_write(sel, (width + 34));
	sunxi_lcd_cmd_write(sel, 0x2B); /* Set row address */
	sunxi_lcd_para_write(sel, y >> 8);
	sunxi_lcd_para_write(sel, y);
	sunxi_lcd_para_write(sel, height >> 8);
	sunxi_lcd_para_write(sel, height);
	sunxi_lcd_cmd_write(sel, 0x2c);
}

static void LCD_panel_init(unsigned int sel)
{
	if (bsp_disp_get_panel_info(sel, &info[sel])) {
		lcd_fb_wrn("get panel info fail!\n");
		return;
	}

	sunxi_lcd_cmd_write(sel, 0x11);
	sunxi_lcd_delay_ms(120);
	sunxi_lcd_cmd_write(sel, 0x36);
	sunxi_lcd_para_write(sel, 0x00);

	sunxi_lcd_cmd_write(sel, 0x3A);
	sunxi_lcd_para_write(sel, 0x05);

	sunxi_lcd_cmd_write(sel, 0xB2);
	sunxi_lcd_para_write(sel, 0x0C);
	sunxi_lcd_para_write(sel, 0x0C);
	sunxi_lcd_para_write(sel, 0x00);
	sunxi_lcd_para_write(sel, 0x33);
	sunxi_lcd_para_write(sel, 0x33);

	sunxi_lcd_cmd_write(sel, 0xB7);
	sunxi_lcd_para_write(sel, 0x35);

	sunxi_lcd_cmd_write(sel, 0xBB);
	sunxi_lcd_para_write(sel, 0x35);

	sunxi_lcd_cmd_write(sel, 0xC0);
	sunxi_lcd_para_write(sel, 0x2C);

	sunxi_lcd_cmd_write(sel, 0xC2);
	sunxi_lcd_para_write(sel, 0x01);

	sunxi_lcd_cmd_write(sel, 0xC3);
	sunxi_lcd_para_write(sel, 0x13);

	sunxi_lcd_cmd_write(sel, 0xC4);
	sunxi_lcd_para_write(sel, 0x20);

	sunxi_lcd_cmd_write(sel, 0xC6);
	sunxi_lcd_para_write(sel, 0x0F);

	sunxi_lcd_cmd_write(sel, 0xD0);
	sunxi_lcd_para_write(sel, 0xA4);
	sunxi_lcd_para_write(sel, 0xA1);

	sunxi_lcd_cmd_write(sel, 0xD6);
	sunxi_lcd_para_write(sel, 0xA1);

	sunxi_lcd_cmd_write(sel, 0xE0);
	sunxi_lcd_para_write(sel, 0xF0);
	sunxi_lcd_para_write(sel, 0x00);
	sunxi_lcd_para_write(sel, 0x04);
	sunxi_lcd_para_write(sel, 0x04);
	sunxi_lcd_para_write(sel, 0x04);
	sunxi_lcd_para_write(sel, 0x05);
	sunxi_lcd_para_write(sel, 0x29);
	sunxi_lcd_para_write(sel, 0x33);
	sunxi_lcd_para_write(sel, 0x3E);
	sunxi_lcd_para_write(sel, 0x38);
	sunxi_lcd_para_write(sel, 0x12);
	sunxi_lcd_para_write(sel, 0x12);
	sunxi_lcd_para_write(sel, 0x28);
	sunxi_lcd_para_write(sel, 0x30);

	sunxi_lcd_cmd_write(sel, 0xE1);
	sunxi_lcd_para_write(sel, 0xF0);
	sunxi_lcd_para_write(sel, 0x07);
	sunxi_lcd_para_write(sel, 0x0A);
	sunxi_lcd_para_write(sel, 0x0D);
	sunxi_lcd_para_write(sel, 0x0B);
	sunxi_lcd_para_write(sel, 0x07);
	sunxi_lcd_para_write(sel, 0x28);
	sunxi_lcd_para_write(sel, 0x33);
	sunxi_lcd_para_write(sel, 0x3E);
	sunxi_lcd_para_write(sel, 0x36);
	sunxi_lcd_para_write(sel, 0x14);
	sunxi_lcd_para_write(sel, 0x14);
	sunxi_lcd_para_write(sel, 0x29);
	sunxi_lcd_para_write(sel, 0x32);

	sunxi_lcd_cmd_write(sel, 0x21);

	sunxi_lcd_cmd_write(sel, 0x11);
	sunxi_lcd_delay_ms(120);
	sunxi_lcd_cmd_write(sel, 0x29);

	if (info[sel].lcd_x < info[sel].lcd_y)
		address(sel, 0, 0, info[sel].lcd_x - 1, info[sel].lcd_y - 1);
	else
		address(sel, 0, 0, info[sel].lcd_y - 1, info[sel].lcd_x - 1);
}

static void LCD_panel_exit(unsigned int sel)
{
	sunxi_lcd_cmd_write(sel, 0x28);
	sunxi_lcd_delay_ms(20);
	sunxi_lcd_cmd_write(sel, 0x10);
	sunxi_lcd_delay_ms(20);
	sunxi_lcd_pin_cfg(sel, 0);
}

static s32 LCD_open_flow(u32 sel)
{
	lcd_fb_here;
	/* open lcd power, and delay 50ms */
	LCD_OPEN_FUNC(sel, LCD_power_on, 50);
	/* open lcd power, than delay 200ms */
	LCD_OPEN_FUNC(sel, LCD_panel_init, 200);

	LCD_OPEN_FUNC(sel, lcd_fb_black_screen, 50);
	/* open lcd backlight, and delay 0ms */
	LCD_OPEN_FUNC(sel, LCD_bl_open, 0);

	return 0;
}

static s32 LCD_close_flow(u32 sel)
{
	lcd_fb_here;
	/* close lcd backlight, and delay 0ms */
	LCD_CLOSE_FUNC(sel, LCD_bl_close, 50);
	/* open lcd power, than delay 200ms */
	LCD_CLOSE_FUNC(sel, LCD_panel_exit, 10);
	/* close lcd power, and delay 500ms */
	LCD_CLOSE_FUNC(sel, LCD_power_off, 10);

	return 0;
}

static void LCD_power_on(u32 sel)
{
	/* config lcd_power pin to open lcd power0 */
	lcd_fb_here;
	power_en(sel, 1);

	sunxi_lcd_power_enable(sel, 0);

	sunxi_lcd_pin_cfg(sel, 1);
	RESET(sel, 1);
	sunxi_lcd_delay_ms(100);
	RESET(sel, 0);
	sunxi_lcd_delay_ms(100);
	RESET(sel, 1);
}

static void LCD_power_off(u32 sel)
{
	lcd_fb_here;
	/* config lcd_power pin to close lcd power0 */
	sunxi_lcd_power_disable(sel, 0);
	power_en(sel, 0);
}

static void LCD_bl_open(u32 sel)
{
	sunxi_lcd_pwm_enable(sel);
	/* config lcd_bl_en pin to open lcd backlight */
	sunxi_lcd_backlight_enable(sel);
	lcd_fb_here;
}

static void LCD_bl_close(u32 sel)
{
	/* config lcd_bl_en pin to close lcd backlight */
	sunxi_lcd_backlight_disable(sel);
	sunxi_lcd_pwm_disable(sel);
	lcd_fb_here;
}


/* sel: 0:lcd0; 1:lcd1 */
static s32 LCD_user_defined_func(u32 sel, u32 para1, u32 para2, u32 para3)
{
	lcd_fb_here;
	return 0;
}

static int lcd_set_var(unsigned int sel, struct fb_info *p_info)
{
	return 0;
}

static int lcd_set_addr_win(unsigned int sel, int x, int y, int width, int height)
{
	address(sel, x, y, width, height);
	return 0;
}

static int lcd_blank(unsigned int sel, unsigned int en)
{
	return 0;
}

struct __lcd_panel st7789v_panel = {
    /* panel driver name, must mach the name of lcd_drv_name in sys_config.fex
       */
	.name = "st7789v",
	.func = {
		.cfg_open_flow = LCD_open_flow,
		.cfg_close_flow = LCD_close_flow,
		.lcd_user_defined_func = LCD_user_defined_func,
		.blank = lcd_blank,
		.set_var = lcd_set_var,
		.set_addr_win = lcd_set_addr_win,
	},
};

      对接驱动框架

      完成了屏幕驱动的编写，接下来需要对接到 SPILCD 驱动框架。首先编辑 Kconfig

      image-20231017105738155 (1).png

      增加 st7789v 的配置

      image-20231017105814814 (1).png

      config LCD_SUPPORT_ST7789V
    bool "LCD support st7789v panel"
    default n
    ---help---
        If you want to support st7789v panel for display driver, select it.

      然后编辑 panels.c 在 panel_array 里增加 st7789 驱动的引用

      image-20231017105948156 (1).png

      如下图

      image-20231017105919628 (1).png

      #ifdef CONFIG_LCD_SUPPORT_ST7789V
    &st7789v_panel,
#endif

      之后编辑 panels.h 同样增加引用

      image-20231017110043805 (1).png

      如下图

      image-20231017110122397 (1).png

      #ifdef CONFIG_LCD_SUPPORT_ST7789V
extern struct __lcd_panel st7789v_panel;
#endif

      最后编辑外层的 Makefile 增加编译选项

      image-20231017110204681 (1).png

      如下所示

      image-20231017110242997 (1).png

      obj-${CONFIG_LCD_SUPPORT_ST7789V} += panels/st7789v.o

      选择 ST7789V 驱动

      在 SPILCD 驱动选择界面可以看到 LCD_FB panels select 选择 SPI 屏幕的驱动

      进入 LCD_FB panels select 选项

      image-20230825150812435 (2).png

      选择并勾选 [*] LCD support st7789v panel

      image-20231017110344277 (1).png

      配置 SPI LCD 引脚

      打开你喜欢的编辑器，修改文件：board/r128s2/module/configs/sys_config.fex

      [lcd_fb0]
lcd_used            = 1   
lcd_model_name      = "spilcd"   
lcd_driver_name     = "st7789v" 
lcd_x               = 172   
lcd_y               = 320  
lcd_width           = 17  
lcd_height          = 32  
lcd_data_speed      = 50
lcd_pwm_used        = 1
lcd_pwm_ch          = 1
lcd_pwm_freq        = 5000 
lcd_pwm_pol         = 0 
lcd_if              = 0
lcd_pixel_fmt       = 11 
lcd_dbi_fmt         = 2
lcd_dbi_clk_mode    = 1
lcd_dbi_te          = 1
fb_buffer_num       = 2
lcd_dbi_if          = 4
lcd_rgb_order       = 0
lcd_fps             = 60
lcd_spi_bus_num     = 1
lcd_frm             = 2
lcd_gamma_en        = 1
lcd_backlight       = 100

lcd_power_num       = 0
lcd_gpio_regu_num   = 0
lcd_bl_percent_num  = 0

lcd_spi_dc_pin      = port:PA19<1><0><3><0>
;RESET Pin
lcd_gpio_0          = port:PA20<1><0><2><0>

      编译打包

      运行命令 mp 编译打包，可以看到编译了 st7789v.o

      image-20231017111015362 (1).png

      测试

      烧录启动之后，屏幕背光启动，但是屏幕全黑。

      image-20231023101653067.png

      输入 test_spilcd ，屏幕显示黄色。

      image-20231023101719108.png

      image-20231023101636223.png

      输入 lv_examples 1 可以显示 lvgl 界面

      image-20231023101800720.png

      常见问题

      LVGL 出现 DMA Over Size

      image-20231023101154351 (1).png

      这是由于 LVGL 配置的 LV_COLOR_DEPTH 为 32，但是 SPI 屏配置为16位。请修改 lv_conf.h

      image-20231023101317634 (1).png

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