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[examples] Add LVGL example for F469-Discovery
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‎examples/stm32f469_discovery/lvgl/lv_conf_local.h‎

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/*
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* Copyright (c) 2021, Niklas Hauser
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*
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* This file is part of the modm project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#ifndef LV_CONF_H
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# error "Don't include this file directly, use 'lv_conf.h' instead!"
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#endif
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// Maximal resolutions
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#define LV_HOR_RES_MAX 800
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#define LV_VER_RES_MAX 480
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#define LV_DPI 200
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/* Color depth:
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* - 1: 1 byte per pixel
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* - 8: RGB332
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* - 16: RGB565
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* - 32: ARGB8888
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*/
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#define LV_COLOR_DEPTH 16
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// Enable logging at INFO level
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#define LV_USE_LOG 1
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#define LV_LOG_LEVEL LV_LOG_LEVEL_INFO

‎examples/stm32f469_discovery/lvgl/main.cpp‎

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/*
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* Copyright (c) 2020, Raphael Lehmann
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*
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* This file is part of the modm project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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// ----------------------------------------------------------------------------
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#include <modm/board.hpp>
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#include <modm/debug.hpp>
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#include <modm/processing.hpp>
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#include <lvgl/lvgl.h>
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// Set the log level
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#undef MODM_LOG_LEVEL
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#define MODM_LOG_LEVEL modm::log::DEBUG
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using namespace Board;
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using namespace modm::glcd;
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using namespace Board::ft6;
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using namespace modm::literals;
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static uint16_t* displayBuffer;
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static lv_disp_buf_t disp_buf;
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static lv_color_t* buf;
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static constexpr size_t buf_size = LV_HOR_RES_MAX * LV_VER_RES_MAX;
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Touch::Data touchData;
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Touch touch{touchData};
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bool my_touchpad_read(lv_indev_drv_t*, lv_indev_data_t* data)
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{
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RF_CALL_BLOCKING(touch.readTouches());
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Touch::touch_t tp;
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touch.getData().getTouch(&tp, 0);
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// mirror and rotate correctly
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uint16_t x{tp.y}, y{uint16_t(480 - tp.x)};
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data->state = (tp.event == Touch::Event::Contact) ? LV_INDEV_STATE_PR : LV_INDEV_STATE_REL;
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if(data->state == LV_INDEV_STATE_PR) {
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data->point.x = x;
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data->point.y = y;
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}
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return false;
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}
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void my_flush_cb(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p)
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{
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for(lv_coord_t y = area->y1; y <= area->y2; y++) {
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std::memcpy(
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&displayBuffer[(800*y) + area->x1],
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&color_p[(y - area->y1) * (area->x2 - area->x1 + 1)],
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(area->x2 - area->x1 + 1) * sizeof(lv_color_t)
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);
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}
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lv_disp_flush_ready(disp_drv);
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}
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int
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main()
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{
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Board::initialize();
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Board::initializeDisplay();
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Board::initializeTouchscreen();
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MODM_LOG_INFO << "modm LVGL example on STM32F469-Discovery board!\n\n";
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RF_CALL_BLOCKING(touch.configure(Touch::InterruptMode::Trigger, 60, 60));
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lv_init();
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buf = new(modm::MemoryExternal) lv_color_t[buf_size];
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displayBuffer = new(modm::MemoryExternal) uint16_t[buf_size];
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setDisplayBuffer(displayBuffer);
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// Initialize the display buffer
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lv_disp_buf_init(&disp_buf, buf, NULL, buf_size);
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// Initialize the display:
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lv_disp_drv_t disp_drv;
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lv_disp_drv_init(&disp_drv);
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disp_drv.buffer = &disp_buf;
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disp_drv.flush_cb = my_flush_cb;
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disp_drv.hor_res = LV_HOR_RES_MAX;
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disp_drv.ver_res = LV_VER_RES_MAX;
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lv_disp_t * disp;
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disp = lv_disp_drv_register(&disp_drv);
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// Initialize touchscreen driver:
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lv_indev_drv_t indev_drv;
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lv_indev_drv_init(&indev_drv);
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indev_drv.type = LV_INDEV_TYPE_POINTER;
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indev_drv.read_cb = my_touchpad_read;
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lv_indev_drv_register(&indev_drv);
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lv_obj_t* scr = lv_disp_get_scr_act(disp); // Get the current screen
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lv_obj_t* labelA = lv_label_create(scr, NULL);
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lv_label_set_text(labelA, "Hello world!");
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lv_obj_set_pos(labelA, 10, 10);
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lv_obj_set_size(labelA, 120, 50);
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lv_obj_t* btn2 = lv_btn_create(lv_scr_act(), NULL);
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lv_obj_set_pos(btn2, 140, 10);
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lv_obj_set_size(btn2, 120, 50);
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lv_obj_t* label2 = lv_label_create(btn2, NULL);
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lv_label_set_text(label2, "Button2");
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lv_obj_set_event_cb(btn2, [](struct _lv_obj_t * obj, lv_event_t event) {
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static uint16_t btn2Counter = 0;
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if(event == LV_EVENT_PRESSED) {
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lv_label_set_text_fmt(lv_obj_get_child(obj, NULL), "Button 2: %d", ++btn2Counter);
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}
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});
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uint16_t counter = 0;
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modm::ShortPeriodicTimer tmr{20ms};
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while (true)
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{
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lv_task_handler();
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if (tmr.execute())
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{
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lv_label_set_text_fmt(labelA, "counter=%d", ++counter);
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}
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}
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return 0;
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}

‎examples/stm32f469_discovery/lvgl/project.xml‎

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<library>
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<extends>modm:disco-f469ni</extends>
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<options>
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<option name="modm:build:build.path">../../../build/stm32f469_discovery/lvgl</option>
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</options>
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<modules>
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<module>modm:build:scons</module>
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<module>modm:processing:timer</module>
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<module>modm:lvgl</module>
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</modules>
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</library>

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