Diff: main.cpp

Revision:

10:21943bd35341

Parent:

9:f1aebfbe7e78

--- a/main.cpp	Fri Nov 01 15:30:47 2013 +0000
+++ b/main.cpp	Fri Dec 05 18:16:56 2014 +0000
@@ -1,17 +1,148 @@
 #include "mbed.h"
 #include "USBHostMSD.h"
 #include "wave_player.h"
-//mbed Application board waveplayer demo
+//LED lighting effects with sound using the RTOS
 //Plays the wave file "sample.wav" on the USB flash drive
-//Outputs to onboard speaker (but at very low volume)
-//and the Audio Out jack for connection to a set of amplified PC speakers (at higher volume)
-//Needs a USB flash drive inserted with the wav file on it to run
+//using waveplayer code library
+//Class D style audio output on P26 or
+//use the Audio Out jack for connection to a set of amplified PC speakers (at higher volume)
+//Needs a USB flash drive inserted with the *.wav files on it to run with audio effects
+//Pins are setup for mbed LPC1768 on mbed application board
+//Analog Audio Out Jack for PC Speakers- Sparkfun also has a breakout
+//For more info see:
+//http://developer.mbed.org/users/4180_1/notebook/led-lighting-effects-for-modelers/
+AnalogOut DACout(p18);
+//On Board Speaker on Application board but very low volume using PWM
+PwmOut PWMout(p26);
+//LEDs used in demo
+PwmOut myled2(LED2);
+PwmOut myled4(LED4);
+//Use a PWM output to enable dimming
+//1.0 is full on, 0.0 off, 0.5 50% on
 
-//Analog Out Jack
-AnalogOut DACout(p18);
-//On Board Speaker
-PwmOut PWMout(p26);
+inline float random_number()
+{
+    return (rand()/(float(RAND_MAX)));
+}
+void beacon(void const *args)
+{
+    while(1) {
+        //LED warm up effect using PWM
+        for(int i=0; i<50; i++) {
+            myled2 = i/50.0;
+            Thread::wait(1000.0*0.02);
+        }
+        //LED at full brightness level
+        myled2 = 1.0;
+        Thread::wait(1000.0*0.25);
+        //LED cool down effect using PWM
+        for(int i=49; i>0; i--) {
+            myled2 = i/50.0;
+            Thread::wait(1000.0*0.02);
+        }
+        //LED off
+        myled2 = 0.0;
+        Thread::wait(1000.0*1.5);
+    }
+}
+void welding(void const *args)
+{
+    float x = 0.0;
+    while(1) {
+        //get a new random number for PWM
+        x = random_number();
+        //add some exponential brightness scaling
+        //for more of a fast flash effect
+        myled2 = x*x*x;
+        //fast update rate for welding flashes
+        Thread::wait(1000.0*0.02);
+        //add a random pause between welds
+        if (random_number()>0.995) {
+            myled2 = 0.0;
+            Thread::wait(1000.0*random_number());
+        }
+    }
+}
+void fire(void const *args)
+{
+    while(1) {
+//get a new random number for PWM
+        myled2 = random_number();
+//a bit slower time delay can be used for fire
+        wait(0.04);
+    }
+}
+void police(void const *args)
+{
+    while(1) {
+        //flash three times on LED1
+        for(int i=0; i<3; i++) {
+            //ramp up brightness level
+            for(double x = 0.0; x <= 1.0; x = x+0.2) {
+                myled2 = x*x;
+                wait(.02);
+            }
+        }
+        myled2=0.0; //LED1 off
+        //flash three times on LED2
+        for(int i=0; i<3; i++) {
+            //ramp up brightness level
+            for(double x = 0.0; x <= 1.0; x = x+0.2) {
+                myled4 = x*x;
+                wait(.02);
+            }
+        }
+        myled4=0.0; //LED2 off
+    }
+}
+void lighthouse(void const *args)
+{
+    float y=0.0;
 
+    while(1) {
+        for(double x=0.0; x <= 3.14159; x = x + 0.0314159) {
+            y = sin(x); //nice periodic function 0..1..0
+            myled2 = y*y*y;//exponential effect - needs a sharp peak
+            Thread::wait(1000.0*.025);
+        }
+        myled2 = 0.0;
+        //most lighthouses have a 5 second delay - so add another 2.5
+        Thread::wait(1000.0*2.5);
+    }
+}
+
+
+//function to simulate incandescent bulb warm up
+//and cool down cycles
+void incandescent_bulb(PwmOut led, float on_time = 0.1,
+                       float warm_time = 0.2)
+{
+    //LED warm up effect using PWM
+    for(int i=0; i<10; i++) {
+        led = i/10.0;
+        Thread::wait(1000.0*warm_time/10.0);
+    }
+    //LED at full brightness level
+    led = 1.0;
+    Thread::wait(1000.0*on_time);
+    //LED cool down effect using PWM
+    for(int i=9; i>0; i--) {
+        led = i/10.0;
+        Thread::wait(1000.0*warm_time/10.0);
+    }
+    //LED off
+    led = 0.0;
+}
+//LED Railroad Crossing Lighting Effect
+void rrcrossing(void const *args)
+{
+    while(1) {
+        incandescent_bulb(myled2);
+        incandescent_bulb(myled4);
+    }
+}
+
+//wave player plays a *.wav file to D/A and a PWM
 wave_player waver(&DACout,&PWMout);
 
 int main()
@@ -20,15 +151,66 @@
     FILE *wave_file;
     //setup PWM hardware for a Class D style audio output
     PWMout.period(1.0/400000.0);
-    printf("\n\n\nHello, wave world!\n");
     // wait until connected to a USB device
     while(!msd.connect()) {
-        Thread::wait(500);
+        Thread::wait(750);
     }
-    //open wav file and play it
-    wave_file=fopen("/usb/sample.wav","r");
-    waver.play(wave_file);
-    fclose(wave_file);
-    //end of program
-    while(1) {};
-}
\ No newline at end of file
+    while(1) {
+        {
+            //Lighthouse demo with foghorn
+            Thread thread(lighthouse); //Start LED effect thread
+            for(int i=0; i<4; ++i) {
+                //open wav file and play it
+                wave_file=fopen("/usb/foghorn.wav","r");
+                waver.play(wave_file); //Plays (*.wav file
+                fclose(wave_file);
+                Thread::wait(1925);
+            }
+            //end of lighthouse demo;
+            thread.terminate(); //kills LED effect thread whan audio stops
+
+        } //code block forces thread out of scope reclaims mem-can recreate thread object
+        {
+            //Arc Welding with sound
+            Thread thread(welding);
+            //open wav file and play it
+            wave_file=fopen("/usb/welding.wav","r");
+            waver.play(wave_file);
+            fclose(wave_file);
+            //end of welding demo;
+            thread.terminate();
+        }
+        {
+            //Police Lights with siren
+            //code block forces thread out of scope
+            Thread thread(police);
+            //open wav file and play it
+            wave_file=fopen("/usb/emgsiren.wav","r");
+            waver.play(wave_file);
+            fclose(wave_file);
+            //end of police light demo;
+            thread.terminate();
+        }
+        {
+            //Fire with sound
+            Thread thread(fire);
+            //open wav file and play it
+            wave_file=fopen("/usb/fire.wav","r");
+            waver.play(wave_file);
+            fclose(wave_file);
+            //end of fire demo;
+            thread.terminate();
+        }
+
+        {
+            //RR Crossing Lights with Signal Bells
+            Thread thread(rrcrossing);
+            //open wav file and play it
+            wave_file=fopen("/usb/SignalBell.wav","r");
+            waver.play(wave_file);
+            fclose(wave_file);
+            //end of railroad crossing demo;
+            thread.terminate();
+        }
+    }
+}