comparison examples/10-Instruments/d-box/StatusLED.cpp @ 464:8fcfbfb32aa0 prerelease

Examples reorder with subdirectories. Added header to each project. Moved Doxygen to bottom of render.cpp.

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