comparison projects/basic_analog_input/main.cpp @ 57:72726dd4f66c newapi

Renamed basic_sensor project to basic_analog_input for clarity

+/*
+ * main.cpp
+ *
+ *  Created on: Oct 24, 2014
+ *      Author: parallels
+ */
+
+#include <iostream>
+#include <cstdlib>
+#include <libgen.h>
+#include <signal.h>
+#include <getopt.h>
+#include <BeagleRT.h>
+
+using namespace std;
+
+int gSensorInputFrequency = 0;
+int gSensorInputAmplitude = 1;
+
+// Handle Ctrl-C by requesting that the audio rendering stop
+void interrupt_handler(int var)
+{
+	gShouldStop = true;
+}
+
+// Print usage information
+void usage(const char * processName)
+{
+	cerr << "Usage: " << processName << " [options]" << endl;
+
+	BeagleRT_usage();
+
+	cerr << "   --frequency [-f] input:  Choose the analog input controlling frequency (0-7; default 0)\n";
+	cerr << "   --amplitude [-a] input:  Choose the analog input controlling amplitude (0-7; default 1)\n";
+	cerr << "   --help [-h]:             Print this menu\n";
+}
+
+int main(int argc, char *argv[])
+{
+	BeagleRTInitSettings settings;	// Standard audio settings
+
+	struct option customOptions[] =
+	{
+		{"help", 0, NULL, 'h'},
+		{"frequency", 1, NULL, 'f'},
+		{"amplitude", 1, NULL, 'a'},
+		{NULL, 0, NULL, 0}
+	};
+
+	// Set default settings
+	BeagleRT_defaultSettings(&settings);
+
+	// Parse command-line arguments
+	while (1) {
+		int c;
+		if ((c = BeagleRT_getopt_long(argc, argv, "hf:a:", customOptions, &settings)) < 0)
+				break;
+		switch (c) {
+		case 'h':
+				usage(basename(argv[0]));
+				exit(0);
+		case 'f':
+				gSensorInputFrequency = atoi(optarg);
+				if(gSensorInputFrequency < 0 || gSensorInputFrequency > 7) {
+					usage(basename(argv[0]));
+					exit(0);
+				}
+				break;
+		case 'a':
+				gSensorInputAmplitude = atoi(optarg);
+				if(gSensorInputAmplitude < 0 || gSensorInputAmplitude > 7) {
+					usage(basename(argv[0]));
+					exit(0);
+				}
+				break;
+		case '?':
+		default:
+				usage(basename(argv[0]));
+				exit(1);
+		}
+	}
+
+	// Initialise the PRU audio device
+	if(BeagleRT_initAudio(&settings, 0) != 0) {
+		cout << "Error: unable to initialise audio" << endl;
+		return -1;
+	}
+
+	if(settings.verbose) {
+		cout << "--> Frequency on input " << gSensorInputFrequency << endl;
+		cout << "--> Amplitude on input " << gSensorInputAmplitude << endl;
+	}
+
+	// Start the audio device running
+	if(BeagleRT_startAudio()) {
+		cout << "Error: unable to start real-time audio" << endl;
+		return -1;
+	}
+
+	// Set up interrupt handler to catch Control-C and SIGTERM
+	signal(SIGINT, interrupt_handler);
+	signal(SIGTERM, interrupt_handler);
+
+	// Run until told to stop
+	while(!gShouldStop) {
+		usleep(100000);
+	}
+
+	// Stop the audio device
+	BeagleRT_stopAudio();
+
+	// Clean up any resources allocated for audio
+	BeagleRT_cleanupAudio();
+
+	// All done!
+	return 0;
+}