[example] Add SAMV71 Xplained Ultra PWM example

examples/samv71_xplained_ultra/pwm/main.cpp

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+/*
+ * Copyright (c) 2023, 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>
+
+using namespace Board;
+
+// Complementary output on PWM0 Channel2 High / Low outputs
+using OutH2 = GpioC19;
+using OutL2 = GpioD26;
+
+int main()
+{
+	Board::initialize();
+
+	MODM_LOG_INFO << "PWM Test" << modm::endl;
+
+	Pwm0::connect<OutH2::PwmH2, OutL2::PwmL2>();
+
+	Pwm0::initialize();
+	// Period 1500 => MCLK / 1500 = 100 kHz
+	Pwm0::setPeriod(Pwm0::Channel::Ch2, 1500);
+	// 500/1500 = 33.3% duty-cycle
+	Pwm0::setDutyCycle(Pwm0::Channel::Ch2, 500);
+
+	constexpr auto mode = Pwm0::ChannelMode()
+		.setClock(Pwm0::ChannelClock::Mck)
+		.setDeadTimeGeneration(Pwm0::DeadTimeGeneration::Enabled);
+
+	Pwm0::setChannelMode(Pwm0::Channel::Ch2, mode);
+
+	// Set 50 ticks dead-time for both high and low output
+	const auto deadTimeL = 50; // ticks
+	const auto deadTimeH = 50; // ticks
+	Pwm0::setDeadTime(Pwm0::Channel::Ch2, deadTimeL, deadTimeH);
+
+	// Set all outputs to low in override mode
+	Pwm0::configureOutputOverrideValues(Pwm0::Outputs_t{});
+
+	Pwm0::enableChannelOutput(Pwm0::Channels::Ch2);
+
+	while (true)
+	{
+		Led0::toggle();
+		Led1::toggle();
+		modm::delay(500ms);
+
+		// Activate override mode to force outputs to low when button is pressed
+		const auto outputs = Pwm0::Outputs::Ch2PwmH | Pwm0::Outputs::Ch2PwmL;
+		if (ButtonSW0::read())
+			Pwm0::setOutputOverride(outputs, false);
+		else
+			Pwm0::clearOutputOverride(outputs, false);
+
+	}
+
+	return 0;
+}

examples/samv71_xplained_ultra/pwm/project.xml

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+<library>
+  <extends>modm:samv71-xplained-ultra</extends>
+  <options>
+    <option name="modm:build:build.path">../../../build/samv71_xplained_ultra/pwm</option>
+  </options>
+  <modules>
+    <module>modm:build:scons</module>
+    <module>modm:platform:pwm:*</module>
+  </modules>
+</library>