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SPI 驱动 TFT LCD 屏 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。 本次使用的是 Dshan_Display Module，如下图： 引脚配置如下： R128 Devkit TFT 模块
PA12CS
PA13SCK
PA18MOSI
PA9PWM
PA20RESET
PA19RS
3V33.3V
GNDGND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选择驱动的显示屏在 SPILCD 驱动选择界面可以看到 LCD_FB panels select 选择 SPI 屏幕的驱动，本文只注重于 SPI LCD 的使用，驱动编写请查看《SPI LCD 显示驱动》 进入 LCD_FB panels select 选项 选择并勾选 LCD support JLT35031C 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 FEX 解析器不支持行尾注释，直接复制需要删除行尾的注释
;----------------------------------------------------------------------------------;lcd_fb0 configuration;----------------------------------------------------------------------------------[lcd_fb0]lcd_used = 1 ; 使用显示屏lcd_model_name = "spilcd" ; 模型：spilcdlcd_driver_name = "jlt35031c" ; 屏幕驱动：jlt35031clcd_x = 320 ; 屏幕宽分辨率lcd_y = 480 ; 屏幕高分辨率lcd_width = 49 ; 屏幕物理宽度lcd_height = 74 ; 屏幕物理高度lcd_data_speed = 60 ; SPI 驱动频率 60MHzlcd_pwm_used = 1 ; lcd使用pwm背光lcd_pwm_ch = 1 ; lcd使用pwm背光通道1lcd_pwm_freq = 5000 ; lcd使用pwm背光频率5000Hzlcd_pwm_pol = 0 ; lcd使用pwm背光相位0lcd_if = 0 ; lcd使用spi接口，0-spi, 1-dbilcd_pixel_fmt = 11 ; 以下内容详见 SPILCD 文档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> ; DC脚;RESET Pinlcd_gpio_0 = port:PA20<1><0><2><0> ; 复位脚结果以上配置完成后，编译打包烧录，上电后屏幕背光亮起，屏幕为黑色。 并且可以在 LOG 中看到 [LCD_FB] lcd_fb_probe,line:103: 和 spi_clk_init()1609 [spi1] clk rate auto adjust to 48000000 SPI 初始化的 LOG。 然后可以用 test_spilcd 测试屏幕，日志如下 执行命令之后屏幕会变为黄色。 - SPI 屏幕颜色说明：<SPI LCD 显示驱动 - SPI LCD 颜色相关问题>
test_spilcd 代码如下： #include <stdio.h>#include <stdlib.h>#include <stdint.h>#include <string.h>#include <unistd.h>#include <hal_cache.h>#include <hal_mem.h>#include <hal_log.h>#include <hal_cmd.h>#include <hal_lcd_fb.h>static uint32_t width;static uint32_t height;static long int screensize = 0;static char *fbsmem_start = 0;static void lcdfb_fb_init(uint32_t yoffset, struct fb_info *p_info){ p_info->screen_base = fbsmem_start; p_info->var.xres = width; p_info->var.yres = height; p_info->var.xoffset = 0; p_info->var.yoffset = yoffset;}int show_rgb(unsigned int sel){ int i = 0, ret = -1; struct fb_info fb_info; int bpp = 4; unsigned char color[4] = {0xff,0x0,0xff,0x0}; width = bsp_disp_get_screen_width(sel); height = bsp_disp_get_screen_height(sel); screensize = width * bpp * height; fbsmem_start = hal_malloc_coherent(screensize); hal_log_info("width = %d, height = %d, screensize = %d, fbsmem_start = %x\n", width, height, screensize, fbsmem_start); memset(fbsmem_start, 0, screensize); for (i = 0; i < screensize / bpp; ++i) { memcpy(fbsmem_start+i*bpp, color, bpp); } memset(&fb_info, 0, sizeof(struct fb_info)); lcdfb_fb_init(0, &fb_info); hal_dcache_clean((unsigned long)fbsmem_start, screensize); bsp_disp_lcd_set_layer(sel, &fb_info); hal_free_coherent(fbsmem_start); return ret;}static int cmd_test_spilcd(int argc, char **argv){ uint8_t ret; hal_log_info("Run spilcd hal layer test case\n"); ret = show_rgb(0); hal_log_info("spilcd test finish\n"); return ret;}FINSH_FUNCTION_EXPORT_CMD(cmd_test_spilcd, test_spilcd, spilcd hal APIs tests)
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