[examples] Add RTT with OpenOCD example

examples/README.md

@@ -85,7 +85,8 @@ supported development boards:
 [CAN](https://github.com/modm-io/modm/blob/develop/examples/stm32f3_discovery/can/main.cpp),
 [Accelerometer](https://github.com/modm-io/modm/blob/develop/examples/stm32f3_discovery/accelerometer/main.cpp),
 [Gyroscope](https://github.com/modm-io/modm/blob/develop/examples/stm32f3_discovery/rotation/main.cpp),
-[TinyUSB DFU](https://github.com/modm-io/modm/blob/develop/examples/stm32f3_discovery/usb_dfu/main.cpp).
+[TinyUSB DFU](https://github.com/modm-io/modm/blob/develop/examples/stm32f3_discovery/usb_dfu/main.cpp),
+[Logging via RTT](https://github.com/modm-io/modm/blob/develop/examples/stm32f3_discovery/rtt/main.cpp).
 - STM32F4 Discovery:
 [Blinky](https://github.com/modm-io/modm/blob/develop/examples/stm32f4_discovery/blink/main.cpp),
 [CAN](https://github.com/modm-io/modm/blob/develop/examples/stm32f4_discovery/can/main.cpp),

examples/stm32f3_discovery/rtt/main.cpp

@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2021, Niklas Hauser
+ *
+ * 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/processing.hpp>
+#include <modm/debug.hpp>
+
+using namespace Board;
+
+Rtt rtt(0);
+modm::IODeviceObjectWrapper< Rtt, modm::IOBuffer::DiscardIfFull > rtt_device(rtt);
+// Set all four logger streams to use RTT
+modm::log::Logger modm::log::debug(rtt_device);
+modm::log::Logger modm::log::info(rtt_device);
+modm::log::Logger modm::log::warning(rtt_device);
+modm::log::Logger modm::log::error(rtt_device);
+
+#undef MODM_LOG_LEVEL
+#define MODM_LOG_LEVEL modm::log::INFO
+
+/*
+
+ $ scons log-rtt
+╭───OpenOCD───> Real Time Transfer
+╰─────RTT────── stm32f303vct6
+Info : STLINK V2J16S0 (API v2) VID:PID 0483:3748
+Info : stm32f3x.cpu: hardware has 6 breakpoints, 4 watchpoints
+Info : rtt: Searching for control block 'modm.rtt.modm'
+Info : rtt: Control block found at 0x20000c04
+Info : Listening on port 9090 for rtt connections
+Info
+Warning
+Error
+loop: 0
+loop: 1
+loop: 2
+loop: 3
+loop: 4
+loop: 5
+
+
+Type number 0-9, then press enter to send.
+The LED should blink slower or faster.
+
+Ctrl+D to exit
+
+*/
+
+// ----------------------------------------------------------------------------
+int
+main()
+{
+	Board::initialize();
+
+	MODM_LOG_DEBUG << "Debug" << modm::endl;
+	MODM_LOG_INFO << "Info" << modm::endl;
+	MODM_LOG_WARNING << "Warning" << modm::endl;
+	MODM_LOG_ERROR << "Error" << modm::endl;
+
+	uint32_t counter(0);
+	modm::PeriodicTimer tmr(100ms);
+
+	char data;
+	while (true)
+	{
+		MODM_LOG_INFO.get(data);
+		switch(data)
+		{
+			case '0':
+				tmr.restart(1s);
+				break;
+			case '1'...'9':
+				tmr.restart(std::chrono::milliseconds((data - '0') * 100));
+				break;
+		}
+		if (tmr.execute())
+		{
+			LedNorth::toggle();
+
+			MODM_LOG_INFO << "loop: " << counter++ << modm::endl;
+		}
+	}
+
+	return 0;
+}

examples/stm32f3_discovery/rtt/project.xml

@@ -0,0 +1,13 @@
+<library>
+  <extends>modm:disco-f303vc</extends>
+  <options>
+    <option name="modm:build:build.path">../../../build/stm32f3_discovery/rtt</option>
+    <option name="modm:platform:rtt:buffer.rx">16</option>
+  </options>
+  <modules>
+    <module>modm:platform:rtt</module>
+    <module>modm:processing:timer</module>
+    <module>modm:build:scons</module>
+    <module>modm:debug</module>
+  </modules>
+</library>