全志R128使用SPI驱动ST7789V1.47寸LCD

SPI驱动ST7789V1.47寸LCDR128 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。

引脚配置如下：










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
code">$ 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
code">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。
code">;----------------------------------------------------------------------------------;SPI controller configuration;----------------------------------------------------------------------------------;Please config spi in dts[spi1]spi1_used       = 1spi1_cs_number  = 1spi1_cs_bitmap  = 1spi1_cs0        = port:PA12<6><0><3>spi1_sclk       = port:PA13<6><0><3>spi1_mosi       = port:PA18<6><0><3>spi1_miso       = port:PA21<6><0><3>;spi1_hold       = port:PA19<6><0><2>;spi1_wp         = port:PA20<6><0><2>
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
code">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
code">[pwm1]pwm_used        = 1pwm_positive    = port:PA9<4><0><3>
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。
code">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：
code">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

复制这两个驱动，重命名为 st7789v.c

先编辑 st7789v.h 将 nv3029s 改成 st7789v

code">#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
code">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
code">#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

增加 st7789v 的配置

code">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

code">#ifdef CONFIG_LCD_SUPPORT_ST7789V    &st7789v_panel,#endif之后编辑 panels.h 同样增加引用

如下图

code">#ifdef CONFIG_LCD_SUPPORT_ST7789Vextern struct __lcd_panel st7789v_panel;#endif最后编辑外层的 Makefile 增加编译选项

如下所示

code">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
code">[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      = 50lcd_pwm_used        = 1lcd_pwm_ch          = 1lcd_pwm_freq        = 5000 lcd_pwm_pol         = 0 lcd_if              = 0lcd_pixel_fmt       = 11 lcd_dbi_fmt         = 2lcd_dbi_clk_mode    = 1lcd_dbi_te          = 1fb_buffer_num       = 2lcd_dbi_if          = 4lcd_rgb_order       = 0lcd_fps             = 60lcd_spi_bus_num     = 1lcd_frm             = 2lcd_gamma_en        = 1lcd_backlight       = 100lcd_power_num       = 0lcd_gpio_regu_num   = 0lcd_bl_percent_num  = 0lcd_spi_dc_pin      = port:PA19<1><0><3><0>;RESET Pinlcd_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