andrewm@57: /*
andrewm@57:  * main.cpp
andrewm@57:  *
andrewm@57:  *  Created on: Oct 24, 2014
andrewm@57:  *      Author: parallels
andrewm@57:  */
andrewm@57: 
andrewm@57: #include <iostream>
andrewm@57: #include <cstdlib>
andrewm@57: #include <libgen.h>
andrewm@57: #include <signal.h>
andrewm@57: #include <getopt.h>
giuliomoro@301: #include <Bela.h>
andrewm@57: 
andrewm@57: using namespace std;
andrewm@57: 
andrewm@57: int gSensorInputFrequency = 0;
andrewm@57: int gSensorInputAmplitude = 1;
andrewm@57: 
andrewm@57: // Handle Ctrl-C by requesting that the audio rendering stop
andrewm@57: void interrupt_handler(int var)
andrewm@57: {
andrewm@57: 	gShouldStop = true;
andrewm@57: }
andrewm@57: 
andrewm@57: // Print usage information
andrewm@57: void usage(const char * processName)
andrewm@57: {
andrewm@57: 	cerr << "Usage: " << processName << " [options]" << endl;
andrewm@57: 
giuliomoro@301: 	Bela_usage();
andrewm@57: 
andrewm@57: 	cerr << "   --frequency [-f] input:  Choose the analog input controlling frequency (0-7; default 0)\n";
andrewm@57: 	cerr << "   --amplitude [-a] input:  Choose the analog input controlling amplitude (0-7; default 1)\n";
andrewm@57: 	cerr << "   --help [-h]:             Print this menu\n";
andrewm@57: }
andrewm@57: 
andrewm@57: int main(int argc, char *argv[])
andrewm@57: {
giuliomoro@301: 	BelaInitSettings settings;	// Standard audio settings
andrewm@57: 
andrewm@57: 	struct option customOptions[] =
andrewm@57: 	{
andrewm@57: 		{"help", 0, NULL, 'h'},
andrewm@57: 		{"frequency", 1, NULL, 'f'},
andrewm@57: 		{"amplitude", 1, NULL, 'a'},
andrewm@57: 		{NULL, 0, NULL, 0}
andrewm@57: 	};
andrewm@57: 
andrewm@57: 	// Set default settings
giuliomoro@301: 	Bela_defaultSettings(&settings);
andrewm@57: 
andrewm@57: 	// Parse command-line arguments
andrewm@57: 	while (1) {
andrewm@57: 		int c;
giuliomoro@301: 		if ((c = Bela_getopt_long(argc, argv, "hf:a:", customOptions, &settings)) < 0)
andrewm@57: 				break;
andrewm@57: 		switch (c) {
andrewm@57: 		case 'h':
andrewm@57: 				usage(basename(argv[0]));
andrewm@57: 				exit(0);
andrewm@57: 		case 'f':
andrewm@57: 				gSensorInputFrequency = atoi(optarg);
andrewm@57: 				if(gSensorInputFrequency < 0 || gSensorInputFrequency > 7) {
andrewm@57: 					usage(basename(argv[0]));
andrewm@57: 					exit(0);
andrewm@57: 				}
andrewm@57: 				break;
andrewm@57: 		case 'a':
andrewm@57: 				gSensorInputAmplitude = atoi(optarg);
andrewm@57: 				if(gSensorInputAmplitude < 0 || gSensorInputAmplitude > 7) {
andrewm@57: 					usage(basename(argv[0]));
andrewm@57: 					exit(0);
andrewm@57: 				}
andrewm@57: 				break;
andrewm@57: 		case '?':
andrewm@57: 		default:
andrewm@57: 				usage(basename(argv[0]));
andrewm@57: 				exit(1);
andrewm@57: 		}
andrewm@57: 	}
andrewm@57: 
andrewm@57: 	// Initialise the PRU audio device
giuliomoro@301: 	if(Bela_initAudio(&settings, 0) != 0) {
andrewm@57: 		cout << "Error: unable to initialise audio" << endl;
andrewm@57: 		return -1;
andrewm@57: 	}
andrewm@57: 
andrewm@57: 	if(settings.verbose) {
andrewm@57: 		cout << "--> Frequency on input " << gSensorInputFrequency << endl;
andrewm@57: 		cout << "--> Amplitude on input " << gSensorInputAmplitude << endl;
andrewm@57: 	}
andrewm@57: 
andrewm@57: 	// Start the audio device running
giuliomoro@301: 	if(Bela_startAudio()) {
andrewm@57: 		cout << "Error: unable to start real-time audio" << endl;
andrewm@57: 		return -1;
andrewm@57: 	}
andrewm@57: 
andrewm@57: 	// Set up interrupt handler to catch Control-C and SIGTERM
andrewm@57: 	signal(SIGINT, interrupt_handler);
andrewm@57: 	signal(SIGTERM, interrupt_handler);
andrewm@57: 
andrewm@57: 	// Run until told to stop
andrewm@57: 	while(!gShouldStop) {
andrewm@57: 		usleep(100000);
andrewm@57: 	}
andrewm@57: 
andrewm@57: 	// Stop the audio device
giuliomoro@301: 	Bela_stopAudio();
andrewm@57: 
andrewm@57: 	// Clean up any resources allocated for audio
giuliomoro@301: 	Bela_cleanupAudio();
andrewm@57: 
andrewm@57: 	// All done!
andrewm@57: 	return 0;
andrewm@57: }