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[example] Add LGVL example on NUCLEO-L476RG
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‎examples/nucleo_l476rg/lvgl/lv_conf_local.h‎

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/*
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* Copyright (c) 2024, Frank Altheim
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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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#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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// Fonts:
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#define LV_FONT_MONTSERRAT_36 1
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#define LV_FONT_MONTSERRAT_24 1
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#define LV_FONT_MONTSERRAT_16 1
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// Disable anti-aliasing
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#define LV_ANTIALIAS 0

‎examples/nucleo_l476rg/lvgl/main.cpp‎

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/*
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* Copyright (c) 2024, Frank Altheim
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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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// USER INCLUDES
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#include "test_screen.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 = Board::D10;
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using Sck = Board::D13;
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using Miso = Board::D12;
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using Mosi = Board::D11;
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using DataCommands = Board::D9;
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using Reset = Board::D8;
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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 = SpiMaster3;
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using Cs = modm::platform::GpioD2;
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using Sck = modm::platform::GpioC10;
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using Miso = modm::platform::GpioC11;
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using Mosi = modm::platform::GpioC12;
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using Interrupt = modm::platform::GpioC9;
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}
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modm::Touch2046<touch::Spi, touch::Cs> touchController;
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// Define display buffer 1
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static constexpr size_t buf_size = 240 * 320 / 8;
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static lv_color_t modm_aligned(4) buf[buf_size];
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// Define display buffer 2
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static constexpr size_t buf2_size = 240 * 320 / 8;
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static lv_color_t modm_aligned(4) buf2[buf2_size];
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void my_touchpad_read(lv_indev_t*, lv_indev_data_t* data)
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{
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data->state = touchController.isTouched() ? LV_INDEV_STATE_PRESSED : LV_INDEV_STATE_RELEASED;
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if(data->state == LV_INDEV_STATE_PRESSED) {
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std::tuple xy = 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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std::tuple xyRAW = touchController.getRawValues();
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int16_t rawX = std::get<0>(xyRAW);
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int16_t rawY = std::get<1>(xyRAW);
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// Display on test screen
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setTouchText(data->point.x, data->point.y, rawX, rawY);
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}
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}
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void disp_flush(lv_display_t* disp, const lv_area_t* area, uint8_t* px_map)
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{
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tftController.drawRaw(
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{uint16_t(area->x1), uint16_t(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::color::Rgb565*)px_map);
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lv_display_flush_ready(disp);
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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<Board::SystemClock, 24_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<Board::SystemClock, 1.5_MHz>();
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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 = 100,
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};
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touchController.setCalibration(cal);
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MODM_LOG_INFO << "reflow-display on nucleo-l476rg!\n\n";
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lv_display_t *disp = lv_display_create(240, 320);
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lv_display_set_flush_cb(disp, disp_flush);
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lv_display_set_buffers(disp, buf, buf2, sizeof(buf), LV_DISPLAY_RENDER_MODE_PARTIAL);
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// Initialize touchscreen driver:
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lv_indev_t* indev = lv_indev_create();
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// Assert touchscreen driver was created successfully:
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if (indev == NULL) {
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MODM_LOG_ERROR << "Failed to create input device\n";
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while (1) {}
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}
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lv_indev_set_type(indev, LV_INDEV_TYPE_POINTER);
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lv_indev_set_read_cb(indev, my_touchpad_read);
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drawTestScreen();
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modm::ShortPeriodicTimer tmr{20ms};
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while (true)
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{
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lv_timer_handler();
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if (tmr.execute())
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{
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setLblText();
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}
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}
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return 0;
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}

‎examples/nucleo_l476rg/lvgl/project.xml‎

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<library>
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<extends>modm:nucleo-l476rg</extends>
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<options>
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<option name="modm:build:build.path">../../../build/nucleo_l476rg/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:3</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>

‎examples/nucleo_l476rg/lvgl/test_screen.cpp‎

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/*
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* Copyright (c) 2024, Frank Altheim
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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 "test_screen.h"
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#include <lvgl/lvgl.h>
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static lv_obj_t* screen;
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static uint16_t counter = 0;
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static lv_obj_t* labelA;
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static lv_obj_t* labelTouch;
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static lv_obj_t* labelRawTouch;
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void btn_event_cb(lv_event_t *event)
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{
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static uint16_t btnCounter = 0;
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lv_label_set_text_fmt((lv_obj_t*) lv_event_get_user_data(event),
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"Button: %d", ++btnCounter);
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}
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void drawTestScreen(void)
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{
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screen = lv_obj_create(NULL);
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labelA = lv_label_create(screen);
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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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labelTouch = lv_label_create(screen);
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lv_label_set_text_fmt(labelTouch, "Pos Touch: x = %d, y = %d", 0, 0);
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lv_obj_set_pos(labelTouch, 60, 30);
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lv_obj_set_size(labelTouch, 120, 50);
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labelRawTouch = lv_label_create(screen);
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lv_label_set_text_fmt(labelRawTouch, "Raw Touch: x = %d, y = %d", 0, 0);
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lv_obj_set_pos(labelRawTouch, 60, 80);
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lv_obj_set_size(labelRawTouch, 120, 50);
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lv_obj_t* btn = lv_button_create(screen);
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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);
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lv_label_set_text(btnLabel, "Button");
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static lv_style_t style_btn_pressed;
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lv_style_init(&style_btn_pressed);
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lv_style_set_bg_color(&style_btn_pressed, lv_palette_main(LV_PALETTE_ORANGE));
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lv_obj_add_style(btn, &style_btn_pressed, LV_STATE_PRESSED);
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lv_obj_add_event_cb(btn, btn_event_cb, LV_EVENT_PRESSED, btnLabel);
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lv_obj_t* labelB = lv_label_create(screen);
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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_text_font(labelB, &lv_font_montserrat_36, LV_PART_MAIN);
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// Load screen
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lv_scr_load(screen);
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}
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void setLblText(void)
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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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void setTouchText(int16_t x, int16_t y, int16_t rawX, int16_t rawY)
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{
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lv_label_set_text_fmt(labelTouch, "Pos Touch: x = %d, y = %d", x, y);
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lv_label_set_text_fmt(labelRawTouch, "Raw Touch: x = %d, y = %d", rawX, rawY);
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}

‎examples/nucleo_l476rg/lvgl/test_screen.h‎

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/*
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* Copyright (c) 2024, Frank Altheim
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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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#ifndef TEST_SCREEN_H
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#define TEST_SCREEN_H
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#pragma once
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#include <cstdint>
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void drawTestScreen(void);
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void setLblText(void);
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void setTouchText(int16_t x, int16_t y, int16_t rawX, int16_t rawY);
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#endif //TEST_SCREEN_H

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