[examples] Add example for LP503x led driver for Nucleo F042

examples/nucleo_f042k6/lp503x/main.cpp

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+/*
+ * Copyright (c) 2020, Christopher Durand
+ *
+ * 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/driver/pwm/lp503x.hpp>
+
+using namespace Board;
+
+/*
+ * Example to demonstrate LP503x driver
+ * It assumes an LP5036 is connected to the following pins:
+ *   A10 SDA
+ *   A11 SCL
+ *   A7  Enable
+ */
+
+using I2cSda	= GpioA10;
+using I2cScl	= GpioA11;
+using LedEnable	= GpioA7;
+
+constexpr uint8_t i2cAddress = 0b011'0000;
+
+int
+main()
+{
+	Board::initialize();
+	LedEnable::setOutput();
+
+	MODM_LOG_INFO << "LP5036 demo" << modm::endl;
+
+	I2cMaster1::connect<I2cSda::Sda, I2cScl::Scl>();
+	I2cMaster1::initialize<SystemClock, 400_kBd>();
+
+	modm::Lp5036<I2cMaster1> leds{i2cAddress};
+	LedEnable::set();
+
+	// Initialize and enable chip
+	RF_CALL_BLOCKING(leds.initialize());
+	RF_CALL_BLOCKING(leds.enable());
+
+	// Turn on all leds with increasing brightness
+	for(uint8_t channel = 0; channel < 36; ++channel) {
+		const uint8_t brightness = (channel + 1) * 7;
+		RF_CALL_BLOCKING(leds.setChannelBrightness(channel, brightness));
+	}
+
+	modm::delayMilliseconds(1000);
+
+	// Configure outputs 0-5 (rgb led 0-1) in bank mode
+	using LedBankMode = modm::lp503x::LedBankMode;
+	const auto bankLeds = LedBankMode::Led0 | LedBankMode::Led1;
+	RF_CALL_BLOCKING(leds.setBankModeEnabled(bankLeds));
+
+	// Set bank leds to full brightness
+	RF_CALL_BLOCKING(leds.setBankABrightness(255));
+	RF_CALL_BLOCKING(leds.setBankBBrightness(255));
+	RF_CALL_BLOCKING(leds.setBankCBrightness(255));
+
+	// Blink leds in bank mode
+	while(true) {
+		RF_CALL_BLOCKING(leds.setBankBrightness(255));
+		modm::delayMilliseconds(500);
+		RF_CALL_BLOCKING(leds.setBankBrightness(0));
+		modm::delayMilliseconds(500);
+	}
+}

examples/nucleo_f042k6/lp503x/project.xml

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+<library>
+  <extends>modm:nucleo-f042k6</extends>
+  <options>
+    <option name="modm:build:build.path">../../../build/nucleo_f042k6/lp503x</option>
+  </options>
+  <modules>
+    <module>modm:build:scons</module>
+    <module>modm:driver:lp503x</module>
+    <module>modm:platform:i2c:1</module>
+  </modules>
+</library>