ELEC2645 (2019/20) / Mbed 2 deprecated ELEC2645_Project_el18jkeo

Joshua O'hara 201291390

Dependencies:   mbed

Gamepad2/Gamepad.cpp@1:9b659b3c092b, 2020-03-11 (annotated)

Committer:
josh_ohara
Date:
Wed Mar 11 18:41:47 2020 +0000
Revision:
1:9b659b3c092b
initial 11.03.2020

Who changed what in which revision?

UserRevisionLine numberNew contents of line
josh_ohara 1:9b659b3c092b 1 #include "Gamepad.h"
josh_ohara 1:9b659b3c092b 2
josh_ohara 1:9b659b3c092b 3 #include "mbed.h"
josh_ohara 1:9b659b3c092b 4
josh_ohara 1:9b659b3c092b 5 //////////// constructor/destructor ////////////
josh_ohara 1:9b659b3c092b 6 Gamepad::Gamepad()
josh_ohara 1:9b659b3c092b 7 :
josh_ohara 1:9b659b3c092b 8 _led1(new PwmOut(PTA2)),
josh_ohara 1:9b659b3c092b 9 _led2(new PwmOut(PTC2)),
josh_ohara 1:9b659b3c092b 10 _led3(new PwmOut(PTC3)),
josh_ohara 1:9b659b3c092b 11 _led4(new PwmOut(PTA1)),
josh_ohara 1:9b659b3c092b 12 _led5(new PwmOut(PTC10)),
josh_ohara 1:9b659b3c092b 13 _led6(new PwmOut(PTC11)),
josh_ohara 1:9b659b3c092b 14
josh_ohara 1:9b659b3c092b 15 _button_A(new InterruptIn(PTC7)),
josh_ohara 1:9b659b3c092b 16 _button_B(new InterruptIn(PTC9)),
josh_ohara 1:9b659b3c092b 17 _button_X(new InterruptIn(PTC5)),
josh_ohara 1:9b659b3c092b 18 _button_Y(new InterruptIn(PTC0)),
josh_ohara 1:9b659b3c092b 19 _button_start(new InterruptIn(PTC8)),
josh_ohara 1:9b659b3c092b 20
josh_ohara 1:9b659b3c092b 21 _vert(new AnalogIn(PTB11)),
josh_ohara 1:9b659b3c092b 22 _horiz(new AnalogIn(PTB10)),
josh_ohara 1:9b659b3c092b 23
josh_ohara 1:9b659b3c092b 24 _pot1(new AnalogIn(PTB2)),
josh_ohara 1:9b659b3c092b 25 _pot2(new AnalogIn(PTB3)),
josh_ohara 1:9b659b3c092b 26
josh_ohara 1:9b659b3c092b 27 dac(new AnalogOut(DAC0_OUT)),
josh_ohara 1:9b659b3c092b 28 ticker(new Ticker),
josh_ohara 1:9b659b3c092b 29 timeout(new Timeout),
josh_ohara 1:9b659b3c092b 30 note_timeout(new Timeout),
josh_ohara 1:9b659b3c092b 31
josh_ohara 1:9b659b3c092b 32 _x0(0),
josh_ohara 1:9b659b3c092b 33 _y0(0)
josh_ohara 1:9b659b3c092b 34 {}
josh_ohara 1:9b659b3c092b 35
josh_ohara 1:9b659b3c092b 36
josh_ohara 1:9b659b3c092b 37 ///////////////// public methods /////////////////
josh_ohara 1:9b659b3c092b 38
josh_ohara 1:9b659b3c092b 39 void Gamepad::init()
josh_ohara 1:9b659b3c092b 40 {
josh_ohara 1:9b659b3c092b 41 leds_off();
josh_ohara 1:9b659b3c092b 42
josh_ohara 1:9b659b3c092b 43 // read centred values of joystick
josh_ohara 1:9b659b3c092b 44 _x0 = _horiz->read();
josh_ohara 1:9b659b3c092b 45 _y0 = _vert->read();
josh_ohara 1:9b659b3c092b 46
josh_ohara 1:9b659b3c092b 47 // Set all buttons to PullUp
josh_ohara 1:9b659b3c092b 48 _button_A->mode(PullUp);
josh_ohara 1:9b659b3c092b 49 _button_B->mode(PullUp);
josh_ohara 1:9b659b3c092b 50 _button_X->mode(PullUp);
josh_ohara 1:9b659b3c092b 51 _button_Y->mode(PullUp);
josh_ohara 1:9b659b3c092b 52 _button_start->mode(PullUp);
josh_ohara 1:9b659b3c092b 53
josh_ohara 1:9b659b3c092b 54 // Set up interrupts for the fall of buttons
josh_ohara 1:9b659b3c092b 55 _button_A->fall(callback(this,&Gamepad::A_fall_interrupt));
josh_ohara 1:9b659b3c092b 56 _button_B->fall(callback(this,&Gamepad::B_fall_interrupt));
josh_ohara 1:9b659b3c092b 57 _button_X->fall(callback(this,&Gamepad::X_fall_interrupt));
josh_ohara 1:9b659b3c092b 58 _button_Y->fall(callback(this,&Gamepad::Y_fall_interrupt));
josh_ohara 1:9b659b3c092b 59 _button_start->fall(callback(this,&Gamepad::start_fall_interrupt));
josh_ohara 1:9b659b3c092b 60
josh_ohara 1:9b659b3c092b 61 // initalise button flags
josh_ohara 1:9b659b3c092b 62 reset_buttons();
josh_ohara 1:9b659b3c092b 63
josh_ohara 1:9b659b3c092b 64 // number of samples
josh_ohara 1:9b659b3c092b 65 _n = 16;
josh_ohara 1:9b659b3c092b 66 _sample_array = new float[_n];
josh_ohara 1:9b659b3c092b 67
josh_ohara 1:9b659b3c092b 68 // create sample array for one period between 0.0 and 1.0
josh_ohara 1:9b659b3c092b 69 for (int i = 0; i < _n ; i++) {
josh_ohara 1:9b659b3c092b 70 _sample_array[i] = 0.5f + 0.5f*sin(i*2*PI/_n);
josh_ohara 1:9b659b3c092b 71 //printf("y[%i] = %f\n",i,_sample_array[i]);
josh_ohara 1:9b659b3c092b 72 }
josh_ohara 1:9b659b3c092b 73
josh_ohara 1:9b659b3c092b 74 }
josh_ohara 1:9b659b3c092b 75
josh_ohara 1:9b659b3c092b 76 void Gamepad::leds_off()
josh_ohara 1:9b659b3c092b 77 {
josh_ohara 1:9b659b3c092b 78 leds(0.0);
josh_ohara 1:9b659b3c092b 79 }
josh_ohara 1:9b659b3c092b 80
josh_ohara 1:9b659b3c092b 81 void Gamepad::leds_on()
josh_ohara 1:9b659b3c092b 82 {
josh_ohara 1:9b659b3c092b 83 leds(1.0);
josh_ohara 1:9b659b3c092b 84 }
josh_ohara 1:9b659b3c092b 85
josh_ohara 1:9b659b3c092b 86 void Gamepad::leds(float val) const
josh_ohara 1:9b659b3c092b 87 {
josh_ohara 1:9b659b3c092b 88 if (val < 0.0f) {
josh_ohara 1:9b659b3c092b 89 val = 0.0f;
josh_ohara 1:9b659b3c092b 90 }
josh_ohara 1:9b659b3c092b 91 if (val > 1.0f) {
josh_ohara 1:9b659b3c092b 92 val = 1.0f;
josh_ohara 1:9b659b3c092b 93 }
josh_ohara 1:9b659b3c092b 94
josh_ohara 1:9b659b3c092b 95 // leds are active-low, so subtract from 1.0
josh_ohara 1:9b659b3c092b 96 // 0.0 corresponds to fully-off, 1.0 to fully-on
josh_ohara 1:9b659b3c092b 97 val = 1.0f - val;
josh_ohara 1:9b659b3c092b 98
josh_ohara 1:9b659b3c092b 99 _led1->write(val);
josh_ohara 1:9b659b3c092b 100 _led2->write(val);
josh_ohara 1:9b659b3c092b 101 _led3->write(val);
josh_ohara 1:9b659b3c092b 102 _led4->write(val);
josh_ohara 1:9b659b3c092b 103 _led5->write(val);
josh_ohara 1:9b659b3c092b 104 _led6->write(val);
josh_ohara 1:9b659b3c092b 105 }
josh_ohara 1:9b659b3c092b 106
josh_ohara 1:9b659b3c092b 107 void Gamepad::led(int n,float val) const
josh_ohara 1:9b659b3c092b 108 {
josh_ohara 1:9b659b3c092b 109 // ensure they are within valid range
josh_ohara 1:9b659b3c092b 110 if (val < 0.0f) {
josh_ohara 1:9b659b3c092b 111 val = 0.0f;
josh_ohara 1:9b659b3c092b 112 }
josh_ohara 1:9b659b3c092b 113 if (val > 1.0f) {
josh_ohara 1:9b659b3c092b 114 val = 1.0f;
josh_ohara 1:9b659b3c092b 115 }
josh_ohara 1:9b659b3c092b 116
josh_ohara 1:9b659b3c092b 117 switch (n) {
josh_ohara 1:9b659b3c092b 118
josh_ohara 1:9b659b3c092b 119 // check for valid LED number and set value
josh_ohara 1:9b659b3c092b 120
josh_ohara 1:9b659b3c092b 121 case 1:
josh_ohara 1:9b659b3c092b 122 _led1->write(1.0f-val); // active-low so subtract from 1
josh_ohara 1:9b659b3c092b 123 break;
josh_ohara 1:9b659b3c092b 124 case 2:
josh_ohara 1:9b659b3c092b 125 _led2->write(1.0f-val); // active-low so subtract from 1
josh_ohara 1:9b659b3c092b 126 break;
josh_ohara 1:9b659b3c092b 127 case 3:
josh_ohara 1:9b659b3c092b 128 _led3->write(1.0f-val); // active-low so subtract from 1
josh_ohara 1:9b659b3c092b 129 break;
josh_ohara 1:9b659b3c092b 130 case 4:
josh_ohara 1:9b659b3c092b 131 _led4->write(1.0f-val); // active-low so subtract from 1
josh_ohara 1:9b659b3c092b 132 break;
josh_ohara 1:9b659b3c092b 133 case 5:
josh_ohara 1:9b659b3c092b 134 _led5->write(1.0f-val); // active-low so subtract from 1
josh_ohara 1:9b659b3c092b 135 break;
josh_ohara 1:9b659b3c092b 136 case 6:
josh_ohara 1:9b659b3c092b 137 _led6->write(1.0f-val); // active-low so subtract from 1
josh_ohara 1:9b659b3c092b 138 break;
josh_ohara 1:9b659b3c092b 139
josh_ohara 1:9b659b3c092b 140 }
josh_ohara 1:9b659b3c092b 141 }
josh_ohara 1:9b659b3c092b 142
josh_ohara 1:9b659b3c092b 143 float Gamepad::read_pot1() const
josh_ohara 1:9b659b3c092b 144 {
josh_ohara 1:9b659b3c092b 145 return _pot1->read();
josh_ohara 1:9b659b3c092b 146 }
josh_ohara 1:9b659b3c092b 147
josh_ohara 1:9b659b3c092b 148 float Gamepad::read_pot2() const
josh_ohara 1:9b659b3c092b 149 {
josh_ohara 1:9b659b3c092b 150 return _pot2->read();
josh_ohara 1:9b659b3c092b 151 }
josh_ohara 1:9b659b3c092b 152
josh_ohara 1:9b659b3c092b 153
josh_ohara 1:9b659b3c092b 154 // this method gets the magnitude of the joystick movement
josh_ohara 1:9b659b3c092b 155 float Gamepad::get_mag()
josh_ohara 1:9b659b3c092b 156 {
josh_ohara 1:9b659b3c092b 157 Polar p = get_polar();
josh_ohara 1:9b659b3c092b 158 return p.mag;
josh_ohara 1:9b659b3c092b 159 }
josh_ohara 1:9b659b3c092b 160
josh_ohara 1:9b659b3c092b 161 // this method gets the angle of joystick movement (0 to 360, 0 North)
josh_ohara 1:9b659b3c092b 162 float Gamepad::get_angle()
josh_ohara 1:9b659b3c092b 163 {
josh_ohara 1:9b659b3c092b 164 Polar p = get_polar();
josh_ohara 1:9b659b3c092b 165 return p.angle;
josh_ohara 1:9b659b3c092b 166 }
josh_ohara 1:9b659b3c092b 167
josh_ohara 1:9b659b3c092b 168 Direction Gamepad::get_direction()
josh_ohara 1:9b659b3c092b 169 {
josh_ohara 1:9b659b3c092b 170 float angle = get_angle(); // 0 to 360, -1 for centred
josh_ohara 1:9b659b3c092b 171
josh_ohara 1:9b659b3c092b 172 Direction d;
josh_ohara 1:9b659b3c092b 173 // partition 360 into segments and check which segment the angle is in
josh_ohara 1:9b659b3c092b 174 if (angle < 0.0f) {
josh_ohara 1:9b659b3c092b 175 d = CENTRE; // check for -1.0 angle
josh_ohara 1:9b659b3c092b 176 } else if (angle < 22.5f) { // then keep going in 45 degree increments
josh_ohara 1:9b659b3c092b 177 d = N;
josh_ohara 1:9b659b3c092b 178 } else if (angle < 67.5f) {
josh_ohara 1:9b659b3c092b 179 d = NE;
josh_ohara 1:9b659b3c092b 180 } else if (angle < 112.5f) {
josh_ohara 1:9b659b3c092b 181 d = E;
josh_ohara 1:9b659b3c092b 182 } else if (angle < 157.5f) {
josh_ohara 1:9b659b3c092b 183 d = SE;
josh_ohara 1:9b659b3c092b 184 } else if (angle < 202.5f) {
josh_ohara 1:9b659b3c092b 185 d = S;
josh_ohara 1:9b659b3c092b 186 } else if (angle < 247.5f) {
josh_ohara 1:9b659b3c092b 187 d = SW;
josh_ohara 1:9b659b3c092b 188 } else if (angle < 292.5f) {
josh_ohara 1:9b659b3c092b 189 d = W;
josh_ohara 1:9b659b3c092b 190 } else if (angle < 337.5f) {
josh_ohara 1:9b659b3c092b 191 d = NW;
josh_ohara 1:9b659b3c092b 192 } else {
josh_ohara 1:9b659b3c092b 193 d = N;
josh_ohara 1:9b659b3c092b 194 }
josh_ohara 1:9b659b3c092b 195
josh_ohara 1:9b659b3c092b 196 return d;
josh_ohara 1:9b659b3c092b 197 }
josh_ohara 1:9b659b3c092b 198
josh_ohara 1:9b659b3c092b 199 void Gamepad::reset_buttons()
josh_ohara 1:9b659b3c092b 200 {
josh_ohara 1:9b659b3c092b 201 A_fall = B_fall = X_fall = Y_fall = start_fall = false;
josh_ohara 1:9b659b3c092b 202 }
josh_ohara 1:9b659b3c092b 203
josh_ohara 1:9b659b3c092b 204 bool Gamepad::A_pressed()
josh_ohara 1:9b659b3c092b 205 {
josh_ohara 1:9b659b3c092b 206 if (A_fall) {
josh_ohara 1:9b659b3c092b 207 A_fall = false;
josh_ohara 1:9b659b3c092b 208 return true;
josh_ohara 1:9b659b3c092b 209 } else {
josh_ohara 1:9b659b3c092b 210 return false;
josh_ohara 1:9b659b3c092b 211 }
josh_ohara 1:9b659b3c092b 212 }
josh_ohara 1:9b659b3c092b 213
josh_ohara 1:9b659b3c092b 214 bool Gamepad::B_pressed()
josh_ohara 1:9b659b3c092b 215 {
josh_ohara 1:9b659b3c092b 216 if (B_fall) {
josh_ohara 1:9b659b3c092b 217 B_fall = false;
josh_ohara 1:9b659b3c092b 218 return true;
josh_ohara 1:9b659b3c092b 219 } else {
josh_ohara 1:9b659b3c092b 220 return false;
josh_ohara 1:9b659b3c092b 221 }
josh_ohara 1:9b659b3c092b 222 }
josh_ohara 1:9b659b3c092b 223
josh_ohara 1:9b659b3c092b 224 bool Gamepad::X_pressed()
josh_ohara 1:9b659b3c092b 225 {
josh_ohara 1:9b659b3c092b 226 if (X_fall) {
josh_ohara 1:9b659b3c092b 227 X_fall = false;
josh_ohara 1:9b659b3c092b 228 return true;
josh_ohara 1:9b659b3c092b 229 } else {
josh_ohara 1:9b659b3c092b 230 return false;
josh_ohara 1:9b659b3c092b 231 }
josh_ohara 1:9b659b3c092b 232 }
josh_ohara 1:9b659b3c092b 233
josh_ohara 1:9b659b3c092b 234 bool Gamepad::Y_pressed()
josh_ohara 1:9b659b3c092b 235 {
josh_ohara 1:9b659b3c092b 236 if (Y_fall) {
josh_ohara 1:9b659b3c092b 237 Y_fall = false;
josh_ohara 1:9b659b3c092b 238 return true;
josh_ohara 1:9b659b3c092b 239 } else {
josh_ohara 1:9b659b3c092b 240 return false;
josh_ohara 1:9b659b3c092b 241 }
josh_ohara 1:9b659b3c092b 242 }
josh_ohara 1:9b659b3c092b 243
josh_ohara 1:9b659b3c092b 244 bool Gamepad::start_pressed()
josh_ohara 1:9b659b3c092b 245 {
josh_ohara 1:9b659b3c092b 246 if (start_fall) {
josh_ohara 1:9b659b3c092b 247 start_fall = false;
josh_ohara 1:9b659b3c092b 248 return true;
josh_ohara 1:9b659b3c092b 249 } else {
josh_ohara 1:9b659b3c092b 250 return false;
josh_ohara 1:9b659b3c092b 251 }
josh_ohara 1:9b659b3c092b 252 }
josh_ohara 1:9b659b3c092b 253
josh_ohara 1:9b659b3c092b 254 bool Gamepad::A_held()
josh_ohara 1:9b659b3c092b 255 {
josh_ohara 1:9b659b3c092b 256 // Buttons are configured as PullUp hence the not
josh_ohara 1:9b659b3c092b 257 return !_button_A->read();
josh_ohara 1:9b659b3c092b 258 }
josh_ohara 1:9b659b3c092b 259
josh_ohara 1:9b659b3c092b 260 bool Gamepad::B_held()
josh_ohara 1:9b659b3c092b 261 {
josh_ohara 1:9b659b3c092b 262 return !_button_B->read();
josh_ohara 1:9b659b3c092b 263 }
josh_ohara 1:9b659b3c092b 264
josh_ohara 1:9b659b3c092b 265 bool Gamepad::X_held()
josh_ohara 1:9b659b3c092b 266 {
josh_ohara 1:9b659b3c092b 267 return !_button_X->read();
josh_ohara 1:9b659b3c092b 268 }
josh_ohara 1:9b659b3c092b 269
josh_ohara 1:9b659b3c092b 270 bool Gamepad::Y_held()
josh_ohara 1:9b659b3c092b 271 {
josh_ohara 1:9b659b3c092b 272 return !_button_Y->read();
josh_ohara 1:9b659b3c092b 273 }
josh_ohara 1:9b659b3c092b 274
josh_ohara 1:9b659b3c092b 275 bool Gamepad::start_held()
josh_ohara 1:9b659b3c092b 276 {
josh_ohara 1:9b659b3c092b 277 return !_button_start->read();
josh_ohara 1:9b659b3c092b 278 }
josh_ohara 1:9b659b3c092b 279
josh_ohara 1:9b659b3c092b 280 ///////////////////// private methods ////////////////////////
josh_ohara 1:9b659b3c092b 281
josh_ohara 1:9b659b3c092b 282 // get raw joystick coordinate in range -1 to 1
josh_ohara 1:9b659b3c092b 283 // Direction (x,y)
josh_ohara 1:9b659b3c092b 284 // North (0,1)
josh_ohara 1:9b659b3c092b 285 // East (1,0)
josh_ohara 1:9b659b3c092b 286 // South (0,-1)
josh_ohara 1:9b659b3c092b 287 // West (-1,0)
josh_ohara 1:9b659b3c092b 288 Vector2D Gamepad::get_coord()
josh_ohara 1:9b659b3c092b 289 {
josh_ohara 1:9b659b3c092b 290 // read() returns value in range 0.0 to 1.0 so is scaled and centre value
josh_ohara 1:9b659b3c092b 291 // substracted to get values in the range -1.0 to 1.0
josh_ohara 1:9b659b3c092b 292 float x = 2.0f*( _horiz->read() - _x0 );
josh_ohara 1:9b659b3c092b 293 float y = 2.0f*( _vert->read() - _y0 );
josh_ohara 1:9b659b3c092b 294
josh_ohara 1:9b659b3c092b 295 // Note: the y value here is inverted to ensure the positive y is up
josh_ohara 1:9b659b3c092b 296
josh_ohara 1:9b659b3c092b 297 Vector2D coord = {x,-y};
josh_ohara 1:9b659b3c092b 298 return coord;
josh_ohara 1:9b659b3c092b 299 }
josh_ohara 1:9b659b3c092b 300
josh_ohara 1:9b659b3c092b 301 // This maps the raw x,y coord onto a circular grid.
josh_ohara 1:9b659b3c092b 302 // See: http://mathproofs.blogspot.co.uk/2005/07/mapping-square-to-circle.html
josh_ohara 1:9b659b3c092b 303 Vector2D Gamepad::get_mapped_coord()
josh_ohara 1:9b659b3c092b 304 {
josh_ohara 1:9b659b3c092b 305 Vector2D coord = get_coord();
josh_ohara 1:9b659b3c092b 306
josh_ohara 1:9b659b3c092b 307 // do the transformation
josh_ohara 1:9b659b3c092b 308 float x = coord.x*sqrt(1.0f-pow(coord.y,2.0f)/2.0f);
josh_ohara 1:9b659b3c092b 309 float y = coord.y*sqrt(1.0f-pow(coord.x,2.0f)/2.0f);
josh_ohara 1:9b659b3c092b 310
josh_ohara 1:9b659b3c092b 311 Vector2D mapped_coord = {x,y};
josh_ohara 1:9b659b3c092b 312 return mapped_coord;
josh_ohara 1:9b659b3c092b 313 }
josh_ohara 1:9b659b3c092b 314
josh_ohara 1:9b659b3c092b 315 // this function converts the mapped coordinates into polar form
josh_ohara 1:9b659b3c092b 316 Polar Gamepad::get_polar()
josh_ohara 1:9b659b3c092b 317 {
josh_ohara 1:9b659b3c092b 318 // get the mapped coordinate
josh_ohara 1:9b659b3c092b 319 Vector2D coord = get_mapped_coord();
josh_ohara 1:9b659b3c092b 320
josh_ohara 1:9b659b3c092b 321 // at this point, 0 degrees (i.e. x-axis) will be defined to the East.
josh_ohara 1:9b659b3c092b 322 // We want 0 degrees to correspond to North and increase clockwise to 359
josh_ohara 1:9b659b3c092b 323 // like a compass heading, so we need to swap the axis and invert y
josh_ohara 1:9b659b3c092b 324 float x = coord.y;
josh_ohara 1:9b659b3c092b 325 float y = coord.x;
josh_ohara 1:9b659b3c092b 326
josh_ohara 1:9b659b3c092b 327 float mag = sqrt(x*x+y*y); // pythagoras
josh_ohara 1:9b659b3c092b 328 float angle = RAD2DEG*atan2(y,x);
josh_ohara 1:9b659b3c092b 329 // angle will be in range -180 to 180, so add 360 to negative angles to
josh_ohara 1:9b659b3c092b 330 // move to 0 to 360 range
josh_ohara 1:9b659b3c092b 331 if (angle < 0.0f) {
josh_ohara 1:9b659b3c092b 332 angle+=360.0f;
josh_ohara 1:9b659b3c092b 333 }
josh_ohara 1:9b659b3c092b 334
josh_ohara 1:9b659b3c092b 335 // the noise on the ADC causes the values of x and y to fluctuate slightly
josh_ohara 1:9b659b3c092b 336 // around the centred values. This causes the random angle values to get
josh_ohara 1:9b659b3c092b 337 // calculated when the joystick is centred and untouched. This is also when
josh_ohara 1:9b659b3c092b 338 // the magnitude is very small, so we can check for a small magnitude and then
josh_ohara 1:9b659b3c092b 339 // set the angle to -1. This will inform us when the angle is invalid and the
josh_ohara 1:9b659b3c092b 340 // joystick is centred
josh_ohara 1:9b659b3c092b 341
josh_ohara 1:9b659b3c092b 342 if (mag < TOL) {
josh_ohara 1:9b659b3c092b 343 mag = 0.0f;
josh_ohara 1:9b659b3c092b 344 angle = -1.0f;
josh_ohara 1:9b659b3c092b 345 }
josh_ohara 1:9b659b3c092b 346
josh_ohara 1:9b659b3c092b 347 Polar p = {mag,angle};
josh_ohara 1:9b659b3c092b 348 return p;
josh_ohara 1:9b659b3c092b 349 }
josh_ohara 1:9b659b3c092b 350
josh_ohara 1:9b659b3c092b 351 // ISRs for buttons
josh_ohara 1:9b659b3c092b 352 void Gamepad::A_fall_interrupt()
josh_ohara 1:9b659b3c092b 353 {
josh_ohara 1:9b659b3c092b 354 A_fall = true;
josh_ohara 1:9b659b3c092b 355 }
josh_ohara 1:9b659b3c092b 356 void Gamepad::B_fall_interrupt()
josh_ohara 1:9b659b3c092b 357 {
josh_ohara 1:9b659b3c092b 358 B_fall = true;
josh_ohara 1:9b659b3c092b 359 }
josh_ohara 1:9b659b3c092b 360 void Gamepad::X_fall_interrupt()
josh_ohara 1:9b659b3c092b 361 {
josh_ohara 1:9b659b3c092b 362 X_fall = true;
josh_ohara 1:9b659b3c092b 363 }
josh_ohara 1:9b659b3c092b 364 void Gamepad::Y_fall_interrupt()
josh_ohara 1:9b659b3c092b 365 {
josh_ohara 1:9b659b3c092b 366 Y_fall = true;
josh_ohara 1:9b659b3c092b 367 }
josh_ohara 1:9b659b3c092b 368 void Gamepad::start_fall_interrupt()
josh_ohara 1:9b659b3c092b 369 {
josh_ohara 1:9b659b3c092b 370 start_fall = true;
josh_ohara 1:9b659b3c092b 371 }
josh_ohara 1:9b659b3c092b 372
josh_ohara 1:9b659b3c092b 373 void Gamepad::set_bpm(float bpm)
josh_ohara 1:9b659b3c092b 374 {
josh_ohara 1:9b659b3c092b 375 _bpm = bpm;
josh_ohara 1:9b659b3c092b 376 }
josh_ohara 1:9b659b3c092b 377
josh_ohara 1:9b659b3c092b 378 void Gamepad::tone(float frequency,float duration)
josh_ohara 1:9b659b3c092b 379 {
josh_ohara 1:9b659b3c092b 380 // calculate time step between samples
josh_ohara 1:9b659b3c092b 381 float dt = 1.0f/(frequency*_n);
josh_ohara 1:9b659b3c092b 382 // start from beginning of LUT
josh_ohara 1:9b659b3c092b 383 _sample = 0;
josh_ohara 1:9b659b3c092b 384
josh_ohara 1:9b659b3c092b 385 // setup ticker and timeout to stop ticker
josh_ohara 1:9b659b3c092b 386
josh_ohara 1:9b659b3c092b 387 // the ticker repeats every dt to plat each sample in turn
josh_ohara 1:9b659b3c092b 388 ticker->attach(callback(this, &Gamepad::ticker_isr), dt);
josh_ohara 1:9b659b3c092b 389 // the timeout stops the ticker after the required duration
josh_ohara 1:9b659b3c092b 390 timeout->attach(callback(this, &Gamepad::timeout_isr), duration );
josh_ohara 1:9b659b3c092b 391 }
josh_ohara 1:9b659b3c092b 392
josh_ohara 1:9b659b3c092b 393 void Gamepad::play_melody(int length,const int *notes,const int *durations,float bpm,bool repeat)
josh_ohara 1:9b659b3c092b 394 {
josh_ohara 1:9b659b3c092b 395 // copy arguments to member variables
josh_ohara 1:9b659b3c092b 396 _bpm = bpm;
josh_ohara 1:9b659b3c092b 397 _notes = notes; // pointer for array
josh_ohara 1:9b659b3c092b 398 _durations = durations; // pointer for array
josh_ohara 1:9b659b3c092b 399 _melody_length = length;
josh_ohara 1:9b659b3c092b 400 _repeat = repeat;
josh_ohara 1:9b659b3c092b 401
josh_ohara 1:9b659b3c092b 402 _note = 0; // start from first note
josh_ohara 1:9b659b3c092b 403
josh_ohara 1:9b659b3c092b 404 play_next_note(); // play the next note in the melody
josh_ohara 1:9b659b3c092b 405 }
josh_ohara 1:9b659b3c092b 406
josh_ohara 1:9b659b3c092b 407 void Gamepad::write_dac(float val)
josh_ohara 1:9b659b3c092b 408 {
josh_ohara 1:9b659b3c092b 409 if (val < 0.0f) {
josh_ohara 1:9b659b3c092b 410 val = 0.0f;
josh_ohara 1:9b659b3c092b 411 } else if (val > 1.0f) {
josh_ohara 1:9b659b3c092b 412 val = 1.0f;
josh_ohara 1:9b659b3c092b 413 }
josh_ohara 1:9b659b3c092b 414 dac->write(val);
josh_ohara 1:9b659b3c092b 415 }
josh_ohara 1:9b659b3c092b 416
josh_ohara 1:9b659b3c092b 417
josh_ohara 1:9b659b3c092b 418 void Gamepad::play_next_note()
josh_ohara 1:9b659b3c092b 419 {
josh_ohara 1:9b659b3c092b 420 // _note is the note index to play
josh_ohara 1:9b659b3c092b 421
josh_ohara 1:9b659b3c092b 422 // calculate the duration and frequency of the note
josh_ohara 1:9b659b3c092b 423 float duration = 60.0f/(_bpm*_durations[_note]);
josh_ohara 1:9b659b3c092b 424 float frequency = float(_notes[_note]);
josh_ohara 1:9b659b3c092b 425 //printf("[%i] f = %f d = %f\n",_note,frequency,duration);
josh_ohara 1:9b659b3c092b 426
josh_ohara 1:9b659b3c092b 427 // check if the note is not a space and if not then play the note
josh_ohara 1:9b659b3c092b 428 if (frequency > 0) {
josh_ohara 1:9b659b3c092b 429 tone(frequency,duration);
josh_ohara 1:9b659b3c092b 430 }
josh_ohara 1:9b659b3c092b 431
josh_ohara 1:9b659b3c092b 432 // the timeout goes to the next note in the melody
josh_ohara 1:9b659b3c092b 433 // double the duration to leave a bit of a gap in between notes to be better
josh_ohara 1:9b659b3c092b 434 // able to distinguish them
josh_ohara 1:9b659b3c092b 435 note_timeout->attach(callback(this, &Gamepad::note_timeout_isr), duration*2.0f );
josh_ohara 1:9b659b3c092b 436 }
josh_ohara 1:9b659b3c092b 437
josh_ohara 1:9b659b3c092b 438 // called when the next note needs playing
josh_ohara 1:9b659b3c092b 439 void Gamepad::note_timeout_isr()
josh_ohara 1:9b659b3c092b 440 {
josh_ohara 1:9b659b3c092b 441 _note++; // go onto next note
josh_ohara 1:9b659b3c092b 442
josh_ohara 1:9b659b3c092b 443 // if in repeat mode then reset the note counter when get to end of melody
josh_ohara 1:9b659b3c092b 444 if (_repeat && _note == _melody_length) {
josh_ohara 1:9b659b3c092b 445 _note=0;
josh_ohara 1:9b659b3c092b 446 }
josh_ohara 1:9b659b3c092b 447
josh_ohara 1:9b659b3c092b 448 // check if note is within the melody
josh_ohara 1:9b659b3c092b 449 if (_note < _melody_length) {
josh_ohara 1:9b659b3c092b 450 play_next_note();
josh_ohara 1:9b659b3c092b 451 }
josh_ohara 1:9b659b3c092b 452 }
josh_ohara 1:9b659b3c092b 453
josh_ohara 1:9b659b3c092b 454 void Gamepad::ticker_isr()
josh_ohara 1:9b659b3c092b 455 {
josh_ohara 1:9b659b3c092b 456 dac->write(_sample_array[_sample%_n]); // use modulo to get index to play
josh_ohara 1:9b659b3c092b 457 _sample++; // increment the sample ready for next time
josh_ohara 1:9b659b3c092b 458 }
josh_ohara 1:9b659b3c092b 459
josh_ohara 1:9b659b3c092b 460 void Gamepad::timeout_isr()
josh_ohara 1:9b659b3c092b 461 {
josh_ohara 1:9b659b3c092b 462 // stops the ticker to end the note
josh_ohara 1:9b659b3c092b 463 ticker->detach();
josh_ohara 1:9b659b3c092b 464 }