giuliomoro@19: /*
giuliomoro@19:  * assignment1_crossover
giuliomoro@19:  * RTDSP 2015
giuliomoro@19:  *
giuliomoro@19:  * First assignment for ECS732 RTDSP, to implement a 2-way audio crossover
giuliomoro@19:  * using the BeagleBone Black.
giuliomoro@19:  *
giuliomoro@19:  * Andrew McPherson and Victor Zappi
giuliomoro@19:  * Queen Mary, University of London
giuliomoro@19:  */
giuliomoro@19: 
giuliomoro@19: #include <iostream>
giuliomoro@19: #include <cstdlib>
giuliomoro@19: #include <libgen.h>
giuliomoro@19: #include <signal.h>
giuliomoro@19: #include <getopt.h>
giuliomoro@19: #include <unistd.h>
giuliomoro@19: #include <stdlib.h>
giuliomoro@19: #include <fcntl.h>
giuliomoro@19: 
andrewm@56: #include <BeagleRT.h>
andrewm@56: 
giuliomoro@19: using namespace std;
giuliomoro@19: 
giuliomoro@19: // Handle Ctrl-C by requesting that the audio rendering stop
giuliomoro@19: void interrupt_handler(int var)
giuliomoro@19: {
giuliomoro@19: 	gShouldStop = true;
giuliomoro@19: }
giuliomoro@19: 
giuliomoro@19: // Print usage information
giuliomoro@19: void usage(const char * processName)
giuliomoro@19: {
giuliomoro@19: 	cerr << "Usage: " << processName << " [options]" << endl;
giuliomoro@19: 
giuliomoro@19: 	BeagleRT_usage();
giuliomoro@19: 
giuliomoro@19: 	cerr << "   --help [-h]:                Print this menu\n";
giuliomoro@19: }
giuliomoro@19: 
giuliomoro@19: int main(int argc, char *argv[])
giuliomoro@19: {
andrewm@52: 	BeagleRTInitSettings settings;	// Standard audio settings
giuliomoro@19: 	float frequency = 1000.0;	// Frequency of crossover
giuliomoro@19: 
giuliomoro@19: 	struct option customOptions[] =
giuliomoro@19: 	{
giuliomoro@19: 		{"help", 0, NULL, 'h'},
giuliomoro@19: 		{"frequency", 1, NULL, 'f'},
giuliomoro@19: 		{NULL, 0, NULL, 0}
giuliomoro@19: 	};
giuliomoro@19: 
giuliomoro@19: 	// Set default settings
giuliomoro@19: 	BeagleRT_defaultSettings(&settings);
giuliomoro@19: 
giuliomoro@19: 	// Parse command-line arguments
giuliomoro@19: 	while (1) {
giuliomoro@19: 		int c;
giuliomoro@19: 		if ((c = BeagleRT_getopt_long(argc, argv, "hf:", customOptions, &settings)) < 0)
giuliomoro@19: 				break;
giuliomoro@19: 		switch (c) {
giuliomoro@19: 		case 'h':
giuliomoro@19: 				usage(basename(argv[0]));
giuliomoro@19: 				exit(0);
giuliomoro@19:         case 'f':
giuliomoro@19:         		frequency = atof(optarg);
giuliomoro@19:         		if(frequency < 20.0)
giuliomoro@19:         			frequency = 20.0;
giuliomoro@19:         		if(frequency > 5000.0)
giuliomoro@19:         			frequency = 5000.0;
giuliomoro@19:         		break;
giuliomoro@19: 		case '?':
giuliomoro@19: 		default:
giuliomoro@19: 				usage(basename(argv[0]));
giuliomoro@19: 				exit(1);
giuliomoro@19: 		}
giuliomoro@19: 	}
giuliomoro@19: 
giuliomoro@19: 	// Initialise the PRU audio device
giuliomoro@19: 	if(BeagleRT_initAudio(&settings, &frequency) != 0) {
giuliomoro@19: 		cout << "Error: unable to initialise audio" << endl;
giuliomoro@19: 		return -1;
giuliomoro@19: 	}
giuliomoro@19: 
giuliomoro@19: 	// Start the audio device running
giuliomoro@19: 	if(BeagleRT_startAudio()) {
giuliomoro@19: 		cout << "Error: unable to start real-time audio" << endl;
giuliomoro@19: 		return -1;
giuliomoro@19: 	}
giuliomoro@19: 
giuliomoro@19: 	// Set up interrupt handler to catch Control-C
giuliomoro@19: 	signal(SIGINT, interrupt_handler);
giuliomoro@19: 	signal(SIGTERM, interrupt_handler);
giuliomoro@19: 
giuliomoro@19: 	// Run until told to stop
giuliomoro@19: 	while(!gShouldStop) {
giuliomoro@19: 		usleep(100000);
giuliomoro@19: 	}
giuliomoro@19: 
giuliomoro@19: 	// Stop the audio device
giuliomoro@19: 	BeagleRT_stopAudio();
giuliomoro@19: 
giuliomoro@19: 	// Clean up any resources allocated for audio
giuliomoro@19: 	BeagleRT_cleanupAudio();
giuliomoro@19: 
giuliomoro@19: 	// All done!
giuliomoro@19: 	return 0;
giuliomoro@19: }