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[examples] Add LVGL example for Nucleo-L452RE with Ili9341
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‎examples/nucleo_l452re/lvgl/lv_conf_local.h‎

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/*
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* Copyright (c) 2021, 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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#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 240
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#define LV_VER_RES_MAX 320
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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
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// Enable a bigger font
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#define LV_FONT_MONTSERRAT_36 1
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// Disable anti-aliasing
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#define LV_ANTIALIAS 0

‎examples/nucleo_l452re/lvgl/main.cpp‎

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/*
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* Copyright (c) 2021, 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 <modm/driver/display/ili9341_spi.hpp>
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#include <modm/driver/touch/touch2046.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::literals;
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namespace tft
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{
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using DmaRx = Dma1::Channel2;
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using DmaTx = Dma1::Channel3;
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using Spi = SpiMaster1_Dma<DmaRx, DmaTx>;
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//using Spi = SpiMaster1;
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using Cs = modm::platform::GpioC8;
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using Sck = modm::platform::GpioA5;
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using Miso = modm::platform::GpioA6;
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using Mosi = modm::platform::GpioA7;
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using DataCommands = modm::platform::GpioC5;
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using Reset = modm::platform::GpioC6;
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using Backlight = modm::platform::GpioC9;
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}
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modm::Ili9341Spi<
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tft::Spi,
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tft::Cs,
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tft::DataCommands,
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tft::Reset,
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tft::Backlight
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> tftController;
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namespace touch
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{
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using Spi = SpiMaster2;
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using Cs = modm::platform::GpioB3;
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using Sck = modm::platform::GpioB13;
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using Miso = modm::platform::GpioB14;
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using Mosi = modm::platform::GpioB15;
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//using Interrupt = modm::platform::GpioA10;
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}
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modm::Touch2046<touch::Spi, touch::Cs> touchController;
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static lv_disp_buf_t disp_buf;
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static constexpr size_t buf_size = LV_HOR_RES_MAX * LV_VER_RES_MAX / 8;
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static lv_color_t buf[buf_size];
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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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data->state = RF_CALL_BLOCKING(touchController.isTouched()) ? LV_INDEV_STATE_PR : LV_INDEV_STATE_REL;
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if(data->state == LV_INDEV_STATE_PR) {
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auto xy = RF_CALL_BLOCKING(touchController.getTouchPosition());
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data->point.x = std::get<0>(xy);
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data->point.y = std::get<1>(xy);
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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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tftController.drawRaw(
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{area->x1, area->y1},
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(area->x2 - area->x1 +1),
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(area->y2 - area->y1 + 1),
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(modm::glcd::Color*)color_p);
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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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Dma1::enable();
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tft::Spi::connect<
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tft::Sck::Sck,
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tft::Miso::Miso,
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tft::Mosi::Mosi>();
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tft::Spi::initialize<SystemClock, 40_MHz>();
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tftController.initialize();
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tftController.enableBacklight(true);
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touch::Spi::connect<
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touch::Sck::Sck,
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touch::Miso::Miso,
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touch::Mosi::Mosi>();
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touch::Spi::initialize<SystemClock, 2500_kHz>();
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modm::touch2046::Calibration cal{
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.OffsetX = -11,
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.OffsetY = 335,
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.FactorX = 22018,
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.FactorY = -29358,
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.MaxX = 240,
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.MaxY = 320,
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.ThresholdZ = 500,
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};
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touchController.setCalibration(cal);
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MODM_LOG_INFO << "modm LVGL example on Nucleo-L452RE board!\n\n";
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lv_init();
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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, 60, 10);
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lv_obj_set_size(labelA, 120, 50);
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lv_obj_t* btn = lv_btn_create(lv_scr_act(), NULL);
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lv_obj_set_pos(btn, 60, 135);
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lv_obj_set_size(btn, 120, 50);
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lv_obj_t* btnLabel = lv_label_create(btn, NULL);
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lv_label_set_text(btnLabel, "Button");
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lv_obj_set_event_cb(btn, [](struct _lv_obj_t * obj, lv_event_t event) {
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static uint16_t btnCounter = 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: %d", ++btnCounter);
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}
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});
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lv_obj_t* labelB = lv_label_create(scr, NULL);
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lv_label_set_text(labelB, "Big Font");
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lv_obj_set_pos(labelB, 40, 260);
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lv_obj_set_style_local_text_font(labelB, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, &lv_font_montserrat_36);
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uint16_t counter = 0;
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modm::ShortPeriodicTimer tmr{10ms};
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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/nucleo_l452re/lvgl/project.xml‎

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<library>
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<extends>modm:nucleo-l452re</extends>
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<options>
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<option name="modm:build:build.path">../../../build/nucleo_l452re/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:driver:ili9341</module>
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<module>modm:driver:touch2046</module>
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<module>modm:platform:spi:1</module>
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<module>modm:platform:spi:2</module>
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<module>modm:platform:dma</module>
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<module>modm:lvgl</module>
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</modules>
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</library>

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