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适配 ST7789v 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 ZJY240S0800TG11，使用的是 SPI 进行驱动。注意请购买带 CS 引脚的 SPI 屏幕，由于 ST7789v SPI 时序问题，CS 引脚直接接地可能会导致初始化无法写入。如果很不幸SPI TFT是不带 CS 的，请飞线出来连接 CS 引脚（如图所示） ![]()
引脚配置如下：R128 Devkit TFT 模块
PA12CS（飞线）
PA13CLK
PA18MOSI
PA9BLK
PA20RES
PA19DC
3V3VCC
GNDGND
悬空MISO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 = 1spi1_cs_number = 1spi1_cs_bitmap = 1spi1_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 = 1pwm_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);delay_ms(120); // Delay 120ms// display and color format settingLCD_WR_REG(0X36);LCD_WR_DATA8(0x00);LCD_WR_REG(0X3A);LCD_WR_DATA8(0X05);// ST7789S Frame rate settingLCD_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);// ST7789S Power settingLCD_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(0xca);LCD_WR_DATA8(0x0f);LCD_WR_REG(0xc8);LCD_WR_DATA8(0x08);LCD_WR_REG(0x55);LCD_WR_DATA8(0x90);LCD_WR_REG(0xd0);LCD_WR_DATA8(0xa4);LCD_WR_DATA8(0xa1);// ST7789S gamma settingLCD_WR_REG(0xe0);LCD_WR_DATA8(0xd0);LCD_WR_DATA8(0x00);LCD_WR_DATA8(0x06);LCD_WR_DATA8(0x09);LCD_WR_DATA8(0x0b);LCD_WR_DATA8(0x2a);LCD_WR_DATA8(0x3c);LCD_WR_DATA8(0x55);LCD_WR_DATA8(0x4b);LCD_WR_DATA8(0x08);LCD_WR_DATA8(0x16);LCD_WR_DATA8(0x14);LCD_WR_DATA8(0x19);LCD_WR_DATA8(0x20);LCD_WR_REG(0xe1);LCD_WR_DATA8(0xd0);LCD_WR_DATA8(0x00);LCD_WR_DATA8(0x06);LCD_WR_DATA8(0x09);LCD_WR_DATA8(0x0b);LCD_WR_DATA8(0x29);LCD_WR_DATA8(0x36);LCD_WR_DATA8(0x54);LCD_WR_DATA8(0x4b);LCD_WR_DATA8(0x0d);LCD_WR_DATA8(0x16);LCD_WR_DATA8(0x14);LCD_WR_DATA8(0x21);LCD_WR_DATA8(0x20);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 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_REGsunxi_lcd_cmd_write
LCD_WR_DATA8sunxi_lcd_para_write
delay_mssunxi_lcd_delay_ms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); sunxi_lcd_delay_ms(120); /* display and color format setting */ sunxi_lcd_cmd_write(sel, 0X36); sunxi_lcd_para_write(sel, 0x00); sunxi_lcd_cmd_write(sel, 0X3A); sunxi_lcd_para_write(sel, 0X05); /* ST7789S Frame rate setting */ 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); /* ST7789S Power setting */ 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, 0xca); sunxi_lcd_para_write(sel, 0x0f); sunxi_lcd_cmd_write(sel, 0xc8); sunxi_lcd_para_write(sel, 0x08); sunxi_lcd_cmd_write(sel, 0x55); sunxi_lcd_para_write(sel, 0x90); sunxi_lcd_cmd_write(sel, 0xd0); sunxi_lcd_para_write(sel, 0xa4); sunxi_lcd_para_write(sel, 0xa1); /* ST7789S gamma setting */ sunxi_lcd_cmd_write(sel, 0xe0); sunxi_lcd_para_write(sel, 0xd0); sunxi_lcd_para_write(sel, 0x00); sunxi_lcd_para_write(sel, 0x06); sunxi_lcd_para_write(sel, 0x09); sunxi_lcd_para_write(sel, 0x0b); sunxi_lcd_para_write(sel, 0x2a); sunxi_lcd_para_write(sel, 0x3c); sunxi_lcd_para_write(sel, 0x55); sunxi_lcd_para_write(sel, 0x4b); sunxi_lcd_para_write(sel, 0x08); sunxi_lcd_para_write(sel, 0x16); sunxi_lcd_para_write(sel, 0x14); sunxi_lcd_para_write(sel, 0x19); sunxi_lcd_para_write(sel, 0x20); sunxi_lcd_cmd_write(sel, 0xe1); sunxi_lcd_para_write(sel, 0xd0); sunxi_lcd_para_write(sel, 0x00); sunxi_lcd_para_write(sel, 0x06); sunxi_lcd_para_write(sel, 0x09); sunxi_lcd_para_write(sel, 0x0b); sunxi_lcd_para_write(sel, 0x29); sunxi_lcd_para_write(sel, 0x36); sunxi_lcd_para_write(sel, 0x54); sunxi_lcd_para_write(sel, 0x4b); sunxi_lcd_para_write(sel, 0x0d); sunxi_lcd_para_write(sel, 0x16); sunxi_lcd_para_write(sel, 0x14); sunxi_lcd_para_write(sel, 0x21); sunxi_lcd_para_write(sel, 0x20); 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_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 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 = 320 lcd_width = 37 lcd_height = 48 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 常见问题屏幕白屏屏幕白屏，但是背光亮起 白屏是因为屏幕没有初始化，需要检查屏幕初始化序列或者初始化数据是否正确。 屏幕花屏屏幕花屏，无法控制 花屏一般是因为屏幕初始化后没有正确设置 addrwin，或者初始化序列错误。 LVGL 屏幕颜色不正确出现反色，颜色异常 请配置 LVGL LV_COLOR_DEPTH 参数为 16，LV_COLOR_16_SWAP 为 1，这是由 SPI LCD 的特性决定的。 显示反色运行 test_spilcd ，屏幕显示蓝色。 这是由于屏幕启动了 RB SWAP，一般是 0x36 寄存器修改 正常显示 sunxi_lcd_cmd_write(sel, 0X36);sunxi_lcd_para_write(sel, 0x00);反色显示 sunxi_lcd_cmd_write(sel, 0X36);sunxi_lcd_para_write(sel, 0x08);
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