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Software/Cpp/grovepi_digital_read.cpp

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+// GrovePi Example for using the digital read command
+// http://dexterindustries.com/grovepi
+
+/*
+## License
+
+   The MIT License (MIT)
+
+   GrovePi for the Raspberry Pi: an open source platform for connecting Grove Sensors to the Raspberry Pi.
+   Copyright (C) 2017  Dexter Industries
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include "grovepi.h"
+using namespace GrovePi;
+
+// sudo g++ -Wall grovepi.cpp grovepi_digital_read.cpp -o grovepi_digital_read.out -> without grovepicpp package installed
+// sudo g++ -Wall -lgrovepicpp grovepi_digital_read.cpp -o grovepi_digital_read.out -> with grovepicpp package installed
+
+int main()
+{
+	int pin = 4; // use port D4
+	int state; // variable to hold the ON/OFF state
+
+	try
+	{
+		initGrovePi(); // initialize communication w/ GrovePi
+		pinMode(pin, INPUT); // set the pin for reading
+
+		// continuously read the data
+		while(true)
+		{
+			// read the data
+			state = digitalRead(pin);
+			printf("[pin %d][digital read = ", pin);
+			if(state == 0)
+				printf("LOW]\n");
+			else
+				printf("HIGH]\n");
+
+			// wait 50 ms so that the program doesn't run too fast
+			delay(50);
+		}
+	}
+	catch (I2CError &error)
+	{
+		printf(error.detail());
+
+		return -1;
+	}
+
+	return 0;
+}