适配ST7789V1.3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 ZJY130S0800TG01，使用的是 SPI 进行驱动。

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

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

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>

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

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>

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

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

找到 LCD 的初始化序列代码

找到屏幕初始化的源码

整理后的初始化代码如下：

LCD_WR_REG(0x11); // Sleep out 
delay_ms(120);    // Delay 120ms 
//************* Start Initial Sequence **********// 
LCD_WR_REG(0x36);
LCD_WR_DATA8(0x00);

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

LCD_WR_REG(0xB2);     
LCD_WR_DATA8(0x1F);   
LCD_WR_DATA8(0x1F);   
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(0x20);   // 2b

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

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

LCD_WR_REG(0xC3);     
LCD_WR_DATA8(0x01);   

LCD_WR_REG(0xC4);     
LCD_WR_DATA8(0x18);   // VDV, 0x20:0v

LCD_WR_REG(0xC6);     
LCD_WR_DATA8(0x13);   // 0x13:60Hz   

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

LCD_WR_REG(0xD6);     
LCD_WR_DATA8(0xA1);   // sleep in后，gate输出为GND

LCD_WR_REG(0xE0);     
LCD_WR_DATA8(0xF0);   
LCD_WR_DATA8(0x04);   
LCD_WR_DATA8(0x07);   
LCD_WR_DATA8(0x04);   
LCD_WR_DATA8(0x04);   
LCD_WR_DATA8(0x04);   
LCD_WR_DATA8(0x25);   
LCD_WR_DATA8(0x33);   
LCD_WR_DATA8(0x3C);   
LCD_WR_DATA8(0x36);   
LCD_WR_DATA8(0x14);   
LCD_WR_DATA8(0x12);   
LCD_WR_DATA8(0x29);   
LCD_WR_DATA8(0x30);   

LCD_WR_REG(0xE1);     
LCD_WR_DATA8(0xF0);   
LCD_WR_DATA8(0x02);   
LCD_WR_DATA8(0x04);   
LCD_WR_DATA8(0x05);   
LCD_WR_DATA8(0x05);   
LCD_WR_DATA8(0x21);   
LCD_WR_DATA8(0x25);   
LCD_WR_DATA8(0x32);   
LCD_WR_DATA8(0x3B);   
LCD_WR_DATA8(0x38);   
LCD_WR_DATA8(0x12);   
LCD_WR_DATA8(0x14);   
LCD_WR_DATA8(0x27);   
LCD_WR_DATA8(0x31);   

LCD_WR_REG(0xE4);     
LCD_WR_DATA8(0x1D);   // 使用240根gate  (N+1)*8
LCD_WR_DATA8(0x00);   // 设定gate起点位置
LCD_WR_DATA8(0x00);   // 当gate没有用完时，bit4(TMG)设为0

LCD_WR_REG(0x21);     

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

复制这两个驱动，重命名为 st7789v.c

先编辑 st7789v.h 将 nv3029s 改成 st7789v

#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

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。

然后将屏厂提供的初始化序列复制进来

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

完成后如下

然后对照屏厂提供的驱动修改 address 函数

做如下修改

static void address(unsigned int sel, int x, int y, int width, int height)
{
    sunxi_lcd_cmd_write(sel, 0x2B); /* Set row address */
    sunxi_lcd_para_write(sel, (y >> 8) & 0xff);
    sunxi_lcd_para_write(sel, y & 0xff);
    sunxi_lcd_para_write(sel, (height >> 8) & 0xff);
    sunxi_lcd_para_write(sel, height & 0xff);
    sunxi_lcd_cmd_write(sel, 0x2A); /* Set coloum address */
    sunxi_lcd_para_write(sel, (x >> 8) & 0xff);
    sunxi_lcd_para_write(sel, x & 0xff);
    sunxi_lcd_para_write(sel, (width >> 8) & 0xff);
    sunxi_lcd_para_write(sel, width & 0xff);
    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, 0x2B); /* Set row address */
    sunxi_lcd_para_write(sel, (y >> 8) & 0xff);
    sunxi_lcd_para_write(sel, y & 0xff);
    sunxi_lcd_para_write(sel, (height >> 8) & 0xff);
    sunxi_lcd_para_write(sel, height & 0xff);
    sunxi_lcd_cmd_write(sel, 0x2A); /* Set coloum address */
    sunxi_lcd_para_write(sel, (x >> 8) & 0xff);
    sunxi_lcd_para_write(sel, x & 0xff);
    sunxi_lcd_para_write(sel, (width >> 8) & 0xff);
    sunxi_lcd_para_write(sel, width & 0xff);
    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); // Sleep out 
    sunxi_lcd_delay_ms(120);    // Delay 120ms 
    //************* Start Initial Sequence **********// 
    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, 0x1F);   
    sunxi_lcd_para_write(sel, 0x1F);   
    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, 0x20);   // 2b

    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, 0x01);   

    sunxi_lcd_cmd_write(sel, 0xC4);     
    sunxi_lcd_para_write(sel, 0x18);   // VDV, 0x20:0v

    sunxi_lcd_cmd_write(sel, 0xC6);     
    sunxi_lcd_para_write(sel, 0x13);   // 0x13:60Hz   

    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);   // sleep in后，gate输出为GND

    sunxi_lcd_cmd_write(sel, 0xE0);     
    sunxi_lcd_para_write(sel, 0xF0);   
    sunxi_lcd_para_write(sel, 0x04);   
    sunxi_lcd_para_write(sel, 0x07);   
    sunxi_lcd_para_write(sel, 0x04);   
    sunxi_lcd_para_write(sel, 0x04);   
    sunxi_lcd_para_write(sel, 0x04);   
    sunxi_lcd_para_write(sel, 0x25);   
    sunxi_lcd_para_write(sel, 0x33);   
    sunxi_lcd_para_write(sel, 0x3C);   
    sunxi_lcd_para_write(sel, 0x36);   
    sunxi_lcd_para_write(sel, 0x14);   
    sunxi_lcd_para_write(sel, 0x12);   
    sunxi_lcd_para_write(sel, 0x29);   
    sunxi_lcd_para_write(sel, 0x30);   

    sunxi_lcd_cmd_write(sel, 0xE1);     
    sunxi_lcd_para_write(sel, 0xF0);   
    sunxi_lcd_para_write(sel, 0x02);   
    sunxi_lcd_para_write(sel, 0x04);   
    sunxi_lcd_para_write(sel, 0x05);   
    sunxi_lcd_para_write(sel, 0x05);   
    sunxi_lcd_para_write(sel, 0x21);   
    sunxi_lcd_para_write(sel, 0x25);   
    sunxi_lcd_para_write(sel, 0x32);   
    sunxi_lcd_para_write(sel, 0x3B);   
    sunxi_lcd_para_write(sel, 0x38);   
    sunxi_lcd_para_write(sel, 0x12);   
    sunxi_lcd_para_write(sel, 0x14);   
    sunxi_lcd_para_write(sel, 0x27);   
    sunxi_lcd_para_write(sel, 0x31);   

    sunxi_lcd_cmd_write(sel, 0xE4);     
    sunxi_lcd_para_write(sel, 0x1D);   // 使用240根gate  (N+1)*8
    sunxi_lcd_para_write(sel, 0x00);   // 设定gate起点位置
    sunxi_lcd_para_write(sel, 0x00);   // 当gate没有用完时，bit4(TMG)设为0

    sunxi_lcd_cmd_write(sel, 0x21);     

    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

增加 st7789v 的配置

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

如下图

#ifdef CONFIG_LCD_SUPPORT_ST7789V
    &st7789v_panel,
#endif

之后编辑 panels.h 同样增加引用

如下图

#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

如下所示

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

选择并勾选 [*] LCD support st7789v panel

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               = 240
lcd_y               = 240  
lcd_width           = 32  
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

测试

烧录启动之后，屏幕背光启动，但是屏幕全黑。

输入 test_spilcd ，屏幕显示黄色。

输入 lv_examples 1 可以显示 lvgl 界面

常见问题

LVGL 出现 DMA Over Size

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

出现部分花屏

• 检查 address 函数是否正确
• 检查 sys_config.fex 屏幕配置分辨率是否正确