effects.cpp

00001 #include "mbed.h"
00002 
00003 // LED on/off times.
00004 // First time is time between toggling sound IO pin and starting lights
00005 // Allows for audio playback start latency and lead in time.
00006 const float thunder1Times[] = {0.1,0.3,0.1,0.3,0.1,0.2,0.2,0.3,0.1,0.3};
00007 const int thunder1Len       =   1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1  ;
00008 
00009 const float thunder2Times[] = {0.1,0.3,0.1,0.3,0.1,0.2, 0.6 ,0.3,0.1,0.3,0.2,0.1, 2 ,0.3,0.15,0.4,0.1,0.2};
00010 const int thunder2Len       =   1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1  + 1 + 1 + 1  ;
00011 
00012 // min time between starting a thunder playback and starting the next audio
00013 const float thunder1AudioLen = 20;
00014 const float thunder2AudioLen = 25;
00015 
00016 // min time between starting a SFX playback and starting the next audio
00017 const float effectAudioLen = 5;
00018 
00019 
00020 // actual time between sound starts will be these numbers plus the thunder/effect length above.
00021 const float minTimeBetweenSounds = 10;
00022 const float maxTimeBetweenSounds = 20;
00023 
00024 // percentage chance of lightnings
00025 const int pLightning = 40;
00026 const int pLightning2 = 15;
00027 
00028 
00029 const int randomRange = 10*(maxTimeBetweenSounds - minTimeBetweenSounds); // range of time between sounds in units of 10ths of a second 
00030 
00031 
00032 DigitalOut soundEffectPin(P0_19);
00033 DigitalOut thunder1Pin(P0_4);
00034 DigitalOut thunder2Pin(P0_5);
00035 
00036 DigitalOut LEDsPin(P0_18);
00037 
00038 DigitalOut LED_1(LED1);
00039 DigitalOut LED_2(LED2);
00040 DigitalOut LED_3(LED3);
00041 BusOut LED_47(LED4,LED5,LED6,LED7);
00042 
00043 
00044 
00045 
00046 void LEDon()
00047 {
00048     LEDsPin = 1;
00049     LED_1 = 1;
00050 }
00051 
00052 void LEDoff()
00053 {
00054     LEDsPin = 0;
00055     LED_1 = 0;
00056 }
00057 
00058 void toggleLED()
00059 {
00060     LEDsPin = !LEDsPin;
00061     LED_1 = LEDsPin;
00062 }
00063 
00064 void randomSoundEffect(void)
00065 {
00066     LED_2 = 1;
00067     soundEffectPin = 0;
00068     wait(1);
00069     LED_2 = 0;
00070     soundEffectPin = 1;
00071     wait(effectAudioLen);
00072 }
00073 
00074 void thunderEffect1(void)
00075 {
00076     LEDoff();
00077     thunder1Pin = 0;
00078     int count = 0;
00079     float totalTime = 0;
00080     while (count < thunder1Len) {
00081         wait (thunder1Times[count]);
00082         totalTime += thunder1Times[count];
00083         toggleLED();
00084         count++;
00085     }
00086     LEDoff();
00087     thunder1Pin = 1;
00088     if (thunder1AudioLen > totalTime)
00089         wait (thunder1AudioLen - totalTime);
00090 }
00091 
00092 void thunderEffect2(void)
00093 {
00094     LEDoff();
00095     thunder2Pin = 0;
00096     int count = 0;
00097     float totalTime = 0;
00098     while (count < thunder2Len) {
00099         wait (thunder2Times[count]);
00100         totalTime += thunder2Times[count];
00101         toggleLED();
00102         count++;
00103     }
00104     LEDoff();
00105     thunder2Pin = 1;
00106     if (thunder2AudioLen > totalTime)
00107         wait (thunder2AudioLen - totalTime);
00108 }
00109 
00110 
00111 void playEffect(void)
00112 {
00113     int randomOrder = rand() % 100;
00114     LED_47 = randomOrder;
00115     LED_3 = 1;
00116     if (randomOrder < pLightning) {
00117         LED_47 = 1;
00118         thunderEffect1();
00119     } else if (randomOrder < (pLightning+pLightning2)) {
00120         LED_47 = 2;
00121         thunderEffect2();
00122     } else {
00123         LED_47 = 3;
00124         randomSoundEffect();
00125     }
00126     LED_3 = 0;
00127 }
00128 
00129 void setupRandom(void)
00130 {
00131     AnalogIn RandomIn(P0_14);
00132     // create a 32 bit number out of 32 LSBs from the ADC
00133     uint32_t seedValue = 0;
00134     uint16_t value;
00135     uint8_t counter;
00136 
00137     for (counter = 0; counter < 32; counter++) {
00138         seedValue = seedValue<<1;
00139         value = RandomIn.read_u16(); // reads a 10 bit ADC normalised to 16 bits.
00140         if (value & 0x0040)          // LSB of ADC output = 1
00141             seedValue++;
00142     }
00143 
00144     srand(seedValue);
00145 }
00146 
00147 main()
00148 {
00149     LED_47 = 0;
00150     LED_2 = 0;
00151     LED_3 = 0;
00152     LEDoff();
00153     thunder1Pin = 1;
00154     thunder2Pin = 1;
00155     soundEffectPin = 1;
00156 
00157     setupRandom();
00158 
00159     float randomTime;
00160     while (true) {
00161         randomTime = minTimeBetweenSounds + (rand() % randomRange)/10.0;
00162         wait(randomTime);
00163         playEffect();
00164     }
00165 }