Raspberry pi pico|树莓派

文章目录接线测试代码LVGL中文手册
前言
前些日子到手了一块 pico和2.2寸屏,想通过显示屏让pico的实验做起来更加丰富多彩 。下图是我的实验成果:
实验说明
【Raspberry pi pico|树莓派】

Raspberry pi pico|树莓派

文章插图
实验中我使用的材料如下:
实验预期效果
pico在2.2寸屏显示一个量规实时显示滑动变阻器的数值 。
接线
Raspberry pi pico|树莓派

文章插图
测试代码
/*** Copyright (c) 2008-2021 深圳百问网科技有限公司** SPDX-License-Identifier: BSD-3-Clause*/#include "pico/stdlib.h"#include "hardware/adc.h"#include "lvgl_src/lvgl.h"#include "ili9341/ili9341.h"#include "ili9341/lv_port_disp.h"//extern void ili9341_init();//extern void lv_port_disp_init(void);static void lv_100ask_adc_gauge_anim(lv_obj_t * gauge, lv_anim_value_t value);static void lv_100ask_widget_test_init(void);static void lv_100ask_widget_test_init(void){lv_anim_t a;// 表盘动画lv_anim_init(&a);lv_obj_t * adc_gauge = lv_gauge_create(lv_scr_act(), NULL);lv_gauge_set_range(adc_gauge, 0 ,3000);lv_gauge_set_critical_value(adc_gauge, 2400);// 设置临界值,超过临界值部分的颜色为 scale_end_colorlv_obj_set_drag_parent(adc_gauge, true);lv_obj_set_size(adc_gauge, 200, 200);lv_obj_align(adc_gauge, NULL, 0, 0, 0);lv_obj_set_style_local_margin_top(adc_gauge, LV_GAUGE_PART_MAIN, LV_STATE_DEFAULT, LV_DPX(30));lv_obj_set_style_local_value_font(adc_gauge, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, &lv_font_montserrat_14); // 设置文字大小lv_obj_set_style_local_value_str(adc_gauge, LV_GAUGE_PART_MAIN, LV_STATE_DEFAULT, "ADC");lv_obj_set_style_local_value_align(adc_gauge, LV_GAUGE_PART_MAIN, LV_STATE_DEFAULT, LV_ALIGN_CENTER);lv_obj_set_style_local_value_ofs_y(adc_gauge, LV_GAUGE_PART_MAIN, LV_STATE_DEFAULT, LV_DPX(80));lv_obj_t * label = lv_label_create(adc_gauge, NULL);lv_obj_set_style_local_text_font(label, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, &lv_font_montserrat_10);// 设置文字大小lv_obj_align(label, adc_gauge, LV_ALIGN_CENTER, 0, lv_obj_get_width(adc_gauge)/4);lv_anim_set_var(&a, adc_gauge);lv_anim_set_exec_cb(&a, (lv_anim_exec_xcb_t)lv_100ask_adc_gauge_anim);lv_anim_set_values(&a, 0, 1);lv_anim_set_time(&a, 500);lv_anim_set_repeat_count(&a, LV_ANIM_REPEAT_INFINITE);lv_anim_start(&a);}/**函数名:static void lv_100ask_adc_gauge_anim(lv_obj_t * gauge, lv_anim_value_t value)*输入参数: 动画对象*输入参数: 传递给动画的数据*返回值:无*函数作用: 更新展示ADC检测值*/static void lv_100ask_adc_gauge_anim(lv_obj_t * gauge, lv_anim_value_t value){adc_select_input(0);uint adc_value = http://www.kingceram.com/post/adc_read();//adc_value = f_value*1000;lv_gauge_set_value(gauge, 0, adc_value);char tmpchar[32] = {0};lv_snprintf(tmpchar, sizeof(tmpchar),"AD:%d\nVoltage:%f v", adc_value, (float)(adc_value * (3.3 / 4096)));lv_obj_t * label = lv_obj_get_child(gauge, NULL);lv_label_set_text(label, tmpchar);lv_obj_align(label, gauge, LV_ALIGN_IN_BOTTOM_MID, 0, -lv_obj_get_height(label));}int main() {stdio_init_all();// possibly set ili9341_config parameters if your pins/spi port don't matchili9341_init();lv_init();lv_port_disp_init();adc_init();// Make sure GPIO is high-impedance, no pullups etcadc_gpio_init(26);//lv_obj_t * scr = lv_obj_create(NULL, NULL);//lv_scr_load(scr);lv_100ask_widget_test_init();while (true) {sleep_ms(5);/*Sleep for 5 millisecond*/lv_task_handler();lv_tick_inc(5);/*Tell LVGL that 5 milliseconds were elapsed*/}}
LVGL中文手册
lvgl官方的教程是英文的,这个是我在做项目时顺便做出来的中文教程站点(持续更新维护),不仅仅只是照搬lvgl官方文档的翻译,同时总结了我们在实际开发中遇到的各种细节,让这个文档更加适合我们在实际开发中的需求 。