[example] Add SAMV71 Xplained Ultra timer example

examples/samv71_xplained_ultra/timer/main.cpp

@@ -0,0 +1,72 @@
+/*
+ * 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>
+#include <modm/platform/timer/timer_channel_0.hpp>
+#include <modm/platform/timer/timer_channel_10.hpp>
+
+using namespace Board;
+
+// use timer channel 10 to toggle led
+MODM_ISR(TC10)
+{
+	// clear interrupt flags by reading
+	(void) TimerChannel10::getInterruptFlags();
+	Led0::toggle();
+}
+
+using Tioa0 = GpioA0;
+
+
+int main()
+{
+	Board::initialize();
+
+	MODM_LOG_INFO << "Timer / Counter Test" << modm::endl;
+
+	// generate 25% duty-cycle 100 kHz PWM waveform on TIOA0 output (GpioA0, output labeled D3 on board)
+	TimerChannel0::initialize();
+	TimerChannel0::connect<Tioa0::Tioa>();
+
+	TimerChannel0::setClockSource(TimerChannel0::ClockSource::Mck);
+	TimerChannel0::setWaveformMode(true);
+	// Up-counter, reset on register C compare match
+	TimerChannel0::setWaveformSelection(TimerChannel0::WavSel::Up_Rc);
+
+	// Clear output on register A match, set on register C match
+	TimerChannel0::setTioaEffects(TimerChannel0::TioEffect::Clear, TimerChannel0::TioEffect::Set);
+	// period MCLK = 150 MHz / 1500 = 100 kHz
+	// duty-cycle 375 / 1500 = 25%
+	TimerChannel0::setRegA(375);
+	TimerChannel0::setRegC(1500);
+	TimerChannel0::enable();
+	TimerChannel0::start();
+
+	// setup timer channel 10 to run interrupt at ~1 Hz from ~32 kHz internal slow clock
+	TimerChannel10::initialize();
+	TimerChannel10::setClockSource(TimerChannel10::ClockSource::Slck);
+	// Toggle every 16384 / 32768 kHz = 0.5s => 1 Hz period
+	TimerChannel10::setRegC(16384);
+	TimerChannel10::setWaveformMode(true);
+	TimerChannel10::setWaveformSelection(TimerChannel10::WavSel::Up_Rc);
+	TimerChannel10::enableInterruptVector(true);
+	TimerChannel10::enableInterrupt(TimerChannel10::Interrupt::RcCompare);
+	TimerChannel10::enable();
+	TimerChannel10::start();
+
+	while (true)
+	{
+		Led1::toggle();
+		modm::delay(500ms);
+	}
+
+	return 0;
+}

examples/samv71_xplained_ultra/timer/project.xml

@@ -0,0 +1,10 @@
+<library>
+  <extends>modm:samv71-xplained-ultra</extends>
+  <options>
+    <option name="modm:build:build.path">../../../build/samv71_xplained_ultra/timer</option>
+  </options>
+  <modules>
+    <module>modm:build:scons</module>
+    <module>modm:platform:timer:*</module>
+  </modules>
+</library>