[examples] add example for STM32F4 discovery with AMSYS5915 pressure …

…sensor

examples/stm32f4_discovery/pressure_amsys5915/SConstruct

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+# path to the xpcc root directory
+xpccpath = '../../..'
+# execute the common SConstruct file
+execfile(xpccpath + '/scons/SConstruct')

examples/stm32f4_discovery/pressure_amsys5915/main.cpp

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+// coding: utf-8
+/* Copyright (c) 2017, Raphael Lehmann
+ * All Rights Reserved.
+ *
+ * The file is part of the xpcc library and is released under the 3-clause BSD
+ * license. See the file `LICENSE` for the full license governing this code.
+ */
+// ----------------------------------------------------------------------------
+
+#include <xpcc/architecture/platform.hpp>
+
+#include <xpcc/processing.hpp>
+#include <xpcc/driver/pressure/amsys5915.hpp>
+#include <xpcc/io/iostream.hpp>
+#include <xpcc/debug/logger.hpp>
+
+xpcc::IODeviceWrapper< Usart2, xpcc::IOBuffer::BlockIfFull > device;
+
+// Set all four logger streams to use the UART
+xpcc::log::Logger xpcc::log::debug(device);
+xpcc::log::Logger xpcc::log::info(device);
+xpcc::log::Logger xpcc::log::warning(device);
+xpcc::log::Logger xpcc::log::error(device);
+
+// Set the log level
+#undef	XPCC_LOG_LEVEL
+#define	XPCC_LOG_LEVEL xpcc::log::DEBUG
+
+/**
+ * Example to demonstrate a XPCC driver for pressure sensor AMSYS 5915
+ *
+ * This example uses I2cMaster2 of STM32F407
+ *
+ * SDA		PB11
+ * SCL		PB10
+ *
+ * GND and +3V are connected to the sensor.
+ */
+
+typedef I2cMaster2 MyI2cMaster;
+// typedef xpcc::SoftwareI2cMaster<GpioB10, GpioB11> MyI2cMaster;
+
+xpcc::amsys5915::Data data;
+xpcc::Amsys5915<MyI2cMaster> pressureSensor(data);
+
+class ThreadOne : public xpcc::pt::Protothread
+{
+public:
+	bool
+	update()
+	{
+		PT_BEGIN();
+
+		XPCC_LOG_DEBUG << "Ping the device from ThreadOne" << xpcc::endl;
+
+		// ping the device until it responds
+		while (true)
+		{
+			// we wait until the task started
+			if (PT_CALL(pressureSensor.ping())) {
+			 	break;
+			}
+			// otherwise, try again in 10ms
+			this->timeout.restart(10);
+			PT_WAIT_UNTIL(this->timeout.isExpired());
+		}
+
+		XPCC_LOG_DEBUG << "Device responded" << xpcc::endl;
+
+		while (true)
+		{
+			while (! PT_CALL(pressureSensor.readPressure()))
+			{
+				PT_YIELD();
+			}
+
+			XPCC_LOG_INFO << "Pressure [0..1]: " << data.getPressure() << xpcc::endl;
+			XPCC_LOG_INFO << "Temperature [degree centigrade]: " << data.getTemperature() << xpcc::endl;
+
+			// read next pressure measurement in 1ms
+			this->timeout.restart(1);
+			PT_WAIT_UNTIL(this->timeout.isExpired());
+		}
+
+		PT_END();
+	}
+private:
+	xpcc::ShortTimeout timeout;
+};
+
+ThreadOne one;
+
+// ----------------------------------------------------------------------------
+int
+main()
+{
+	Board::initialize();
+
+	GpioOutputA2::connect(Usart2::Tx);
+	Usart2::initialize<Board::systemClock, xpcc::Uart::B115200>(10);
+
+	GpioB11::connect(I2cMaster2::Sda);
+	GpioB10::connect(I2cMaster2::Scl);
+
+	MyI2cMaster::initialize<Board::systemClock, 400000>();
+
+	XPCC_LOG_INFO << "\n\nWelcome to AMSYS 5915 pressure sensor demo!\n\n";
+
+	xpcc::ShortPeriodicTimer tmr(500);
+
+	while (1)
+	{
+		one.update();
+		if (tmr.execute()) {
+			Board::LedOrange::toggle();
+		}
+	}
+
+	return 0;
+}

examples/stm32f4_discovery/pressure_amsys5915/project.cfg

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+[build]
+board = stm32f4_discovery
+buildpath = ${xpccpath}/build/stm32f4_discovery/${name}