[examples] Add LVGL example for Nucleo-L452RE with Ili9341

examples/nucleo_l452re/lvgl/lv_conf_local.h

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+/*
+ * Copyright (c) 2021, Raphael Lehmann
+ *
+ * This file is part of the modm project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef LV_CONF_H
+#	error	"Don't include this file directly, use 'lv_conf.h' instead!"
+#endif
+
+#undef LV_FONT_MONTSERRAT_36
+#define LV_FONT_MONTSERRAT_36    1

examples/nucleo_l452re/lvgl/main.cpp

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+/*
+ * Copyright (c) 2021, Raphael Lehmann
+ *
+ * This file is part of the modm project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+// ----------------------------------------------------------------------------
+
+#include <modm/board.hpp>
+#include <modm/debug/logger.hpp>
+#include <modm/driver/display/ili9341_spi.hpp>
+#include <modm/driver/touch/touch2046.hpp>
+
+#include <lvgl/lvgl.h>
+
+
+// Set the log level
+#undef	MODM_LOG_LEVEL
+#define	MODM_LOG_LEVEL modm::log::DEBUG
+
+using namespace Board;
+using namespace modm::literals;
+
+
+namespace tft
+{
+	using DmaRx = Dma1::Channel2;
+	using DmaTx = Dma1::Channel3;
+	using Spi = SpiMaster1_Dma<DmaRx, DmaTx>;
+	//using Spi = SpiMaster1;
+	using Cs = modm::platform::GpioC8;
+	using Sck = modm::platform::GpioA5;
+	using Miso = modm::platform::GpioA6;
+	using Mosi = modm::platform::GpioA7;
+	using DataCommands = modm::platform::GpioC5;
+	using Reset = modm::platform::GpioC6;
+	using Backlight = modm::platform::GpioC9;
+}
+
+modm::Ili9341Spi<
+	tft::Spi,
+	tft::Cs,
+	tft::DataCommands,
+	tft::Reset,
+	tft::Backlight
+> tftController;
+
+namespace touch
+{
+	using Spi = SpiMaster2;
+	using Cs = modm::platform::GpioB3;
+	using Sck = modm::platform::GpioB13;
+	using Miso = modm::platform::GpioB14;
+	using Mosi = modm::platform::GpioB15;
+	//using Interrupt = modm::platform::GpioA10;
+}
+
+modm::Touch2046<touch::Spi, touch::Cs> touchController;
+
+
+static lv_disp_buf_t disp_buf;
+static constexpr size_t buf_size = LV_HOR_RES_MAX * LV_VER_RES_MAX / 8;
+static lv_color_t buf[buf_size];
+
+bool my_touchpad_read(lv_indev_drv_t* indev, lv_indev_data_t* data)
+{
+	data->state = RF_CALL_BLOCKING(touchController.isTouched()) ? LV_INDEV_STATE_PR : LV_INDEV_STATE_REL;
+	if(data->state == LV_INDEV_STATE_PR) {
+		auto xy = RF_CALL_BLOCKING(touchController.getTouchPosition());
+		data->point.x = std::get<0>(xy);
+		data->point.y = std::get<1>(xy);
+	}
+	return false;
+}
+
+void my_flush_cb(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p)
+{
+	tftController.drawRaw(
+		{area->x1, area->y1},
+		(area->x2 - area->x1 +1),
+		(area->y2 - area->y1 + 1),
+		(modm::glcd::Color*)color_p);
+	lv_disp_flush_ready(disp_drv);
+}
+
+int
+main()
+{
+	Board::initialize();
+	Dma1::enable();
+
+	tft::Spi::connect<
+		tft::Sck::Sck,
+		tft::Miso::Miso,
+		tft::Mosi::Mosi>();
+	tft::Spi::initialize<SystemClock, 40_MHz>();
+	tftController.initialize();
+	tftController.enableBacklight(true);
+
+	touch::Spi::connect<
+		touch::Sck::Sck,
+		touch::Miso::Miso,
+		touch::Mosi::Mosi>();
+	touch::Spi::initialize<SystemClock, 2500_kHz>();
+	modm::touch2046::Calibration cal{
+		.OffsetX = -11,
+		.OffsetY = 335,
+		.FactorX = 22018,
+		.FactorY = -29358,
+		.MaxX = 240,
+		.MaxY = 320,
+		.ThresholdZ = 500,
+	};
+	touchController.setCalibration(cal);
+
+	MODM_LOG_INFO << "modm LVGL example on Nucleo-L452RE board!\n\n";
+
+	lv_init();
+
+	// Initialize the display buffer
+	lv_disp_buf_init(&disp_buf, buf, NULL, buf_size);
+
+	// Initialize the display:
+	lv_disp_drv_t disp_drv;
+	lv_disp_drv_init(&disp_drv);
+	disp_drv.buffer = &disp_buf;
+	disp_drv.flush_cb = my_flush_cb;
+	disp_drv.hor_res = LV_HOR_RES_MAX;
+	disp_drv.ver_res = LV_VER_RES_MAX;
+	lv_disp_t * disp;
+	disp = lv_disp_drv_register(&disp_drv);
+
+	// Initialize touchscreen driver:
+	lv_indev_drv_t indev_drv;
+	lv_indev_drv_init(&indev_drv);
+	indev_drv.type = LV_INDEV_TYPE_POINTER;
+	indev_drv.read_cb = my_touchpad_read;
+	lv_indev_drv_register(&indev_drv);
+
+	lv_obj_t* scr = lv_disp_get_scr_act(disp); // Get the current screen
+
+	lv_obj_t* labelA =  lv_label_create(scr, NULL);
+	lv_label_set_text(labelA, "Hello world!");
+	lv_obj_set_pos(labelA, 60, 10);
+	lv_obj_set_size(labelA, 120, 50);
+
+	lv_obj_t* btn = lv_btn_create(lv_scr_act(), NULL);
+	lv_obj_set_pos(btn, 60, 135);
+	lv_obj_set_size(btn, 120, 50);
+	lv_obj_t* btnLabel = lv_label_create(btn, NULL);
+	lv_label_set_text(btnLabel, "Button");
+	lv_obj_set_event_cb(btn, [](struct _lv_obj_t * obj, lv_event_t event) {
+		static uint16_t btnCounter = 0;
+		if(event == LV_EVENT_PRESSED) {
+			lv_label_set_text_fmt(lv_obj_get_child(obj, NULL), "Button: %d", ++btnCounter);
+		}
+	});
+
+	lv_obj_t* labelB =  lv_label_create(scr, NULL);
+	lv_label_set_text(labelB, "Big Font");
+	lv_obj_set_pos(labelB, 40, 260);
+	lv_obj_set_style_local_text_font(labelB, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, &lv_font_montserrat_36);
+
+	uint16_t counter = 0;
+
+	while (true)
+	{
+		lv_label_set_text_fmt(labelA, "counter=%d", ++counter);
+		lv_tick_inc(10);
+		lv_task_handler();
+		modm::delay(10ms);
+	}
+
+	return 0;
+}

examples/nucleo_l452re/lvgl/project.xml

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+<library>
+  <extends>modm:nucleo-l452re</extends>
+  <options>
+    <option name="modm:build:build.path">../../../build/nucleo_l452re/lvgl</option>
+    <option name="modm:lvgl:resolution_horizontal_max">240</option>
+    <option name="modm:lvgl:resolution_vertical_max">320</option>
+    <option name="modm:lvgl:color_depth">RGB565</option>
+    <option name="modm:lvgl:dpi">200</option>
+    <option name="modm:lvgl:logging">Info</option>
+  </options>
+  <modules>
+    <module>modm:build:scons</module>
+    <module>modm:driver:ili9341</module>
+    <module>modm:driver:touch2046</module>
+    <module>modm:platform:spi:1</module>
+    <module>modm:platform:spi:2</module>
+    <module>modm:platform:dma</module>
+    <module>modm:lvgl</module>
+  </modules>
+</library>