zephyr学习： 4.LVGL+LCD显示触摸
参考：ESP32移植Zephyr RTOS（二）-----使用LVGL_esp32 zephyr-CSDN博客
立创实战派开发板(esp32-s3)
1. 硬件结构
触摸屏是I2C接口，TFT是SPI接口（LCD_CS比较特殊，是由PCA9557扩展出来的）
IO扩展是由I2C驱动的
2. 配置LCD的设备树
2.1 配置SPI引脚复用( lc_shizhanpai-pinctrl.dtsi )
[*]SCLK：GPIO41
[*]MOSI：GPIO40
[*]使用SPI3/SPI2, SPI1已经被外部Flash使用了
[*]这里先不配置LCD_CS引脚，因为LCD_CS引脚不是MCU上的引脚。
spim3_default: spim3_default {
group1 {
pinmux = <SPIM3_SCLK_GPIO41>;
};
group2 {
pinmux = <SPIM3_MOSI_GPIO40>;
output-low;
};
};
2.2 配置mipi_dbi
参考esp32的板子可以知道在驱动lcd时用了mipi_dbi的接口，对应zephyr,mipi-dbi-spi的驱动；
LCD驱动芯片是st7789，使用了兼容的sitronix,st7789v驱。
[*] 配置DC引脚：GPIO39
mipi_dbi {
compatible = "zephyr,mipi-dbi-spi";
dc-gpios = <&gpio1 39 GPIO_ACTIVE_HIGH>;
spi-dev = <&spi3>;
write-only;
#address-cells = <1>;
#size-cells = <0>;
st7789v: st7789v@0 {
compatible = "sitronix,st7789v";
mipi-max-frequency = <80000000>;
reg = <0>;
width = <240>;
height = <320>;
x-offset = <0>;
y-offset = <0>;
vcom = <0x19>;
gctrl = <0x35>;
vrhs = <0x12>;
vdvs = <0x20>;
mdac = <0x00>;
gamma = <0x01>;
colmod = <0x55>;
lcm = <0x2c>;
porch-param = ;
cmd2en-param = ;
pwctrl1-param = ;
pvgam-param = ;
nvgam-param = ;
ram-param = ;
rgb-param = ;
mipi-mode = "MIPI_DBI_MODE_SPI_4WIRE";
};
};
2.3 配置I2C0
配置pca9557IO扩展芯片和ft6336触摸屏
[*]两者共用I2C0
[*]pca9557兼容nxp,pca9554
[*]ft6336兼容focaltech,ft5336
&i2c0 {
status = "okay";
clock-frequency = <I2C_BITRATE_STANDARD>;
pinctrl-0 = <&i2c0_default>;
pinctrl-names = "default";
pca9557_io_expander: pca9554@19 {
compatible = "nxp,pca9554";
label = "PCA9557";
status = "okay";
reg = <0x19>;
gpio-controller;
#gpio-cells = <2>;
ngpios = <8>;
};
ft6336_touch: ft5336@38 {
status = "okay";
compatible = "focaltech,ft5336";
reg = <0x38>;
};
};
2.4 配置spi3
[*]关键在于要把LCD_CS脚配置成 cs-gpios
[*]由于这里的spi cs引脚依赖于 pca9557_io_expander，所以在工程prj.conf里面需要降低SPI的初始化优先级（CONFIG_SPI_INIT_PRIORITY=70）
&spi3 {
status = "okay";
#address-cells = <1>;
#size-cells = <0>;
pinctrl-0 = <&spim3_default>;
pinctrl-names = "default";
cs-gpios = <&pca9557_io_expander 0 GPIO_ACTIVE_LOW>;
};
2.5 配置 chosen
zephyr,display = &st7789v;
zephyr,touch = &ft6336_touch;
2.6 配置背光引脚和 lvgl
[*]背光引脚使用gpio-leds驱动
[*]把触摸屏信号配置成lvgl的输入接口
leds {
compatible = "gpio-leds";
tft_backlight: led_0 {
gpios = <&gpio1 42 GPIO_ACTIVE_LOW>;
label = "TFT LCD Backlight";
};
};
lvgl_pointer {
input = <&ft6336_touch>;
compatible = "zephyr,lvgl-pointer-input";
};
完整propu_dts: 点击查看代码/* * Copyright (c) 2022 Espressif Systems (Shanghai) Co., Ltd. * * SPDX-License-Identifier: Apache-2.0 *//dts-v1/;#include #include #include #include #include "lc_shizhanpai-pinctrl.dtsi"/ { model = "lc_shizhanpai PROCPU"; compatible = "espressif,esp32s3"; aliases { i2c0 = &i2c0; watchdog0 = &wdt0; sw2 = &button0; backlight = &tft_backlight; }; chosen { zephyr,sram = &sram1; zephyr,console = &uart0; zephyr,shell-uart = &uart0; zephyr,flash = &flash0; zephyr,code-partition = &slot0_partition; zephyr,bt-hci = &esp32_bt_hci; zephyr,display = &st7789v; zephyr,touch = &ft6336_touch; // zephyr,camera = &lcd_cam; }; buttons { compatible = "gpio-keys"; button0: button_0 { gpios = ; label = "BOOT Button"; zephyr,code = ; }; }; mipi_dbi {
compatible = "zephyr,mipi-dbi-spi";
dc-gpios = <&gpio1 39 GPIO_ACTIVE_HIGH>;
spi-dev = <&spi3>;
write-only;
#address-cells = <1>;
#size-cells = <0>;
st7789v: st7789v@0 {
compatible = "sitronix,st7789v";
mipi-max-frequency = <80000000>;
reg = <0>;
width = <240>;
height = <320>;
x-offset = <0>;
y-offset = <0>;
vcom = <0x19>;
gctrl = <0x35>;
vrhs = <0x12>;
vdvs = <0x20>;
mdac = <0x00>;
gamma = <0x01>;
colmod = <0x55>;
lcm = <0x2c>;
porch-param = ;
cmd2en-param = ;
pwctrl1-param = ;
pvgam-param = ;
nvgam-param = ;
ram-param = ;
rgb-param = ;
mipi-mode = "MIPI_DBI_MODE_SPI_4WIRE";
};
}; leds { compatible = "gpio-leds"; tft_backlight: led_0 { gpios = ; label = "TFT LCD Backlight"; }; }; lvgl_pointer { input = ; compatible = "zephyr,lvgl-pointer-input"; };};&i2c0 {
status = "okay";
clock-frequency = <I2C_BITRATE_STANDARD>;
pinctrl-0 = <&i2c0_default>;
pinctrl-names = "default";
pca9557_io_expander: pca9554@19 {
compatible = "nxp,pca9554";
label = "PCA9557";
status = "okay";
reg = <0x19>;
gpio-controller;
#gpio-cells = <2>;
ngpios = <8>;
};
ft6336_touch: ft5336@38 {
status = "okay";
compatible = "focaltech,ft5336";
reg = <0x38>;
};
};&dma { status = "okay";};&uart0 { status = "okay"; current-speed = ; pinctrl-0 = ; pinctrl-names = "default";};&spi3 {
status = "okay";
#address-cells = <1>;
#size-cells = <0>;
pinctrl-0 = <&spim3_default>;
pinctrl-names = "default";
cs-gpios = <&pca9557_io_expander 0 GPIO_ACTIVE_LOW>;
};&gpio0 { status = "okay";};&gpio1 { status = "okay";};&i2s0 { pinctrl-0 = ; pinctrl-names = "default"; status = "disabled";};&timer0 { status = "disabled";};&timer1 { status = "disabled";};&timer2 { status = "disabled";};&timer3 { status = "disabled";};&wdt0 { status = "okay";};&trng0 { status = "okay";};&usb_serial { status = "disabled";};&esp32_bt_hci { status = "okay";};&wifi { status = "okay";};
3. app程序
3.1 获取背光引脚的信息
在适当时机打开背光。
static const struct gpio_dt_spec backlight = GPIO_DT_SPEC_GET(DT_ALIAS(backlight), gpios);
gpio_pin_configure_dt(&backlight, GPIO_OUTPUT);
gpio_pin_set(backlight.port, backlight.pin, 1);
3.2 创建界面
[*]创建按钮，绑定按键click事件回调，填充文本
[*]创建计数文本
static char count_str = {0};
const struct device *display_dev;
lv_obj_t *hello_world_label;
lv_obj_t *count_label;
lv_obj_t *hello_world_button;
hello_world_button = lv_button_create(lv_screen_active());
lv_obj_align(hello_world_button, LV_ALIGN_CENTER, 0, -15);
lv_obj_add_event_cb(hello_world_button, lv_btn_click_callback, LV_EVENT_CLICKED,
NULL);
hello_world_label = lv_label_create(hello_world_button);
lv_label_set_text(hello_world_label, "Hello world!");
lv_obj_align(hello_world_label, LV_ALIGN_CENTER, 0, 0);
count_label = lv_label_create(lv_screen_active());
lv_obj_align(count_label, LV_ALIGN_BOTTOM_MID, 0, 0);
3.3 屏幕显示
display_blanking_off(display_dev);
lv_timer_handler();
while (1) {
if ((count % 100) == 0U) {
sprintf(count_str, "%d", count/100U);
lv_label_set_text(count_label, count_str);
}
lv_timer_handler();
++count;
k_sleep(K_MSEC(10));
}
prj.conf 配置：点击查看代码# General Config
CONFIG_MAIN_STACK_SIZE=4096
CONFIG_CONSOLE=y
CONFIG_LOG=y
CONFIG_SHELL=y
# Device Config
CONFIG_GPIO=y
CONFIG_I2C=y
CONFIG_SPI=y
CONFIG_INPUT=y
# SPI CS delay depends on PCA9557 IO
CONFIG_SPI_INIT_PRIORITY=70
# LVGL Config
# 16KB
CONFIG_LV_Z_MEM_POOL_SIZE=16384
CONFIG_LV_Z_POINTER_INPUT=y
CONFIG_LV_Z_SHELL=y
CONFIG_LVGL=y
CONFIG_LV_USE_LOG=y
CONFIG_LV_USE_LABEL=y
CONFIG_LV_USE_ARC=y
CONFIG_LV_USE_MONKEY=y
CONFIG_LV_FONT_MONTSERRAT_14=y
# 16-bit color depth RGB565
CONFIG_LV_COLOR_DEPTH_16=y
CONFIG_LV_USE_PERF_MONITOR=y
CONFIG_LV_COLOR_16_SWAP=y
# Display Config
CONFIG_DISPLAY=y
CONFIG_DISPLAY_LOG_LEVEL_ERR=y
主程序:点击查看代码/* * Copyright (c) 2018 Jan Van Winkel* * SPDX-License-Identifier: Apache-2.0 */#include #include #include #include #include #include #include #include #include #define LOG_LEVEL CONFIG_LOG_DEFAULT_LEVEL#include LOG_MODULE_REGISTER(app);static uint32_t count;static const struct gpio_dt_spec backlight = GPIO_DT_SPEC_GET(DT_ALIAS(backlight), gpios);#ifdef CONFIG_GPIOstatic struct gpio_dt_spec button_gpio = GPIO_DT_SPEC_GET_OR(DT_ALIAS(sw0), gpios, {0});static struct gpio_callback button_callback;static void button_isr_callback(const struct device *port, struct gpio_callback *cb, uint32_t pins){ ARG_UNUSED(port); ARG_UNUSED(cb); ARG_UNUSED(pins); count = 0;}#endif /* CONFIG_GPIO */#ifdef CONFIG_LV_Z_ENCODER_INPUTstatic const struct device *lvgl_encoder = DEVICE_DT_GET(DT_COMPAT_GET_ANY_STATUS_OKAY(zephyr_lvgl_encoder_input));#endif /* CONFIG_LV_Z_ENCODER_INPUT */#ifdef CONFIG_LV_Z_KEYPAD_INPUTstatic const struct device *lvgl_keypad = DEVICE_DT_GET(DT_COMPAT_GET_ANY_STATUS_OKAY(zephyr_lvgl_keypad_input));#endif /* CONFIG_LV_Z_KEYPAD_INPUT */static void lv_btn_click_callback(lv_event_t *e){ ARG_UNUSED(e); count = 0;}int main(void){ static char count_str = {0}; const struct device *display_dev; lv_obj_t *hello_world_label; lv_obj_t *count_label; display_dev = DEVICE_DT_GET(DT_CHOSEN(zephyr_display)); if (!device_is_ready(display_dev)) { LOG_ERR("Device not ready, aborting test"); return 0; } lv_obj_t *hello_world_button; hello_world_button = lv_button_create(lv_screen_active()); lv_obj_align(hello_world_button, LV_ALIGN_CENTER, 0, -15); lv_obj_add_event_cb(hello_world_button, lv_btn_click_callback, LV_EVENT_CLICKED, NULL); hello_world_label = lv_label_create(hello_world_button); lv_label_set_text(hello_world_label, "Hello world!"); lv_obj_align(hello_world_label, LV_ALIGN_CENTER, 0, 0); count_label = lv_label_create(lv_screen_active()); lv_obj_align(count_label, LV_ALIGN_BOTTOM_MID, 0, 0); gpio_pin_configure_dt(&backlight, GPIO_OUTPUT); gpio_pin_set(backlight.port, backlight.pin, 1); display_blanking_off(display_dev);
lv_timer_handler();
while (1) {
if ((count % 100) == 0U) {
sprintf(count_str, "%d", count/100U);
lv_label_set_text(count_label, count_str);
}
lv_timer_handler();
++count;
k_sleep(K_MSEC(10));
}}
4. 最终结果
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