robert@464: /*
robert@464:  * StatusLED.cpp
robert@464:  *
robert@464:  * Routines for manipulating the status LED
robert@464:  *
robert@464:  * (c) 2014 Andrew McPherson and Victor Zappi
robert@464:  * QMUL, Centre for Digital Music
robert@464:  */
robert@464: 
robert@464: #include <iostream>
robert@464: #include "StatusLED.h"
robert@464: #include <GPIOcontrol.h>
robert@464: 
robert@464: extern int gShouldStop;
robert@464: extern int gVerbose;
robert@464: 
robert@464: using namespace std;
robert@464: 
robert@464: StatusLED::StatusLED() {
robert@464: 	gpio_number = -1;
robert@464: 	milliseconds_on = 0;
robert@464: 	milliseconds_off = 100;
robert@464: 	blink_thread = -1;
robert@464: }
robert@464: 
robert@464: StatusLED::~StatusLED() {
robert@464: 	if(gpio_number >= 0) {
robert@464: 		this_should_stop = true;
robert@464: 		pthread_join(blink_thread, NULL);
robert@464: 		gpio_unexport(gpio_number);
robert@464: 	}
robert@464: }
robert@464: 
robert@464: bool StatusLED::init(int gpio_pin) {
robert@464: 	gpio_number = gpio_pin;
robert@464: 	this_should_stop = false;
robert@464: 
robert@464: 	if(gpio_export(gpio_number)) {
robert@464: 		if(gVerbose)
robert@464: 			cout << "Warning: couldn't export status LED pin\n";
robert@464: 	}
robert@464: 	if(gpio_set_dir(gpio_number, OUTPUT_PIN)) {
robert@464: 		if(gVerbose)
robert@464: 			cout << "Couldn't set direction on status LED pin\n";
robert@464: 		return false;
robert@464: 	}
robert@464: 	if(gpio_set_value(gpio_number, LOW)) {
robert@464: 		if(gVerbose)
robert@464: 			cout << "Couldn't set value on status LED pin\n";
robert@464: 		return false;
robert@464: 	}
robert@464: 
robert@464: 
robert@464: 	if ( pthread_create(&blink_thread, NULL, static_blink_loop, this) )
robert@464: 	{
robert@464: 		cout << "Error:unable to create status LED thread" << endl;
robert@464: 		return false;
robert@464: 	}
robert@464: 
robert@464: 	return true;
robert@464: }
robert@464: 
robert@464: void StatusLED::on() {
robert@464: 	milliseconds_on = 100;
robert@464: 	milliseconds_off = 0;
robert@464: }
robert@464: 
robert@464: void StatusLED::off() {
robert@464: 	milliseconds_on = 0;
robert@464: 	milliseconds_off = 100;
robert@464: }
robert@464: 
robert@464: void StatusLED::blink(int ms_on, int ms_off) {
robert@464: 	milliseconds_on = ms_on;
robert@464: 	milliseconds_off = ms_off;
robert@464: }
robert@464: 
robert@464: void* StatusLED::blink_loop(void *) {
robert@464: 	while(!gShouldStop && !this_should_stop) {
robert@464: 		if(milliseconds_on != 0)
robert@464: 			gpio_set_value(gpio_number, HIGH);
robert@464: 		usleep(1000 * milliseconds_on);
robert@464: 		if(gShouldStop)
robert@464: 			break;
robert@464: 		if(milliseconds_off != 0)
robert@464: 			gpio_set_value(gpio_number, LOW);
robert@464: 		usleep(1000 * milliseconds_off);
robert@464: 	}
robert@464: 	pthread_exit(NULL);
robert@464: }