Erik Gilling | 3edead5 | 2011-03-08 15:59:23 -0800 | [diff] [blame^] | 1 | #include <Max3421e.h> |
| 2 | #include <Usb.h> |
| 3 | #include <Wire.h> |
| 4 | #include <Servo.h> |
| 5 | |
| 6 | #define USB_ACCESSORY_VENDOR_ID 0x18D1 |
| 7 | #define USB_ACCESSORY_PRODUCT_ID 0x2D00 |
| 8 | |
| 9 | #define USB_ACCESSORY_ADB_PRODUCT_ID 0x2D01 |
| 10 | #define ACCESSORY_STRING_MANUFACTURER 0 |
| 11 | #define ACCESSORY_STRING_MODEL 1 |
| 12 | #define ACCESSORY_STRING_TYPE 2 |
| 13 | #define ACCESSORY_STRING_VERSION 3 |
| 14 | |
| 15 | #define ACCESSORY_SEND_STRING 52 |
| 16 | #define ACCESSORY_START 53 |
| 17 | |
| 18 | |
| 19 | #define LED3_RED 2 |
| 20 | #define LED3_GREEN 3 |
| 21 | #define LED3_BLUE 4 |
| 22 | |
| 23 | #define LED2_RED 5 |
| 24 | #define LED2_GREEN 6 |
| 25 | #define LED2_BLUE 7 |
| 26 | |
| 27 | #define LED1_RED 8 |
| 28 | #define LED1_GREEN 9 |
| 29 | #define LED1_BLUE 10 |
| 30 | |
| 31 | #define SERVO1 11 |
| 32 | #define SERVO2 12 |
| 33 | #define SERVO3 13 |
| 34 | |
| 35 | #define TOUCH 14 |
| 36 | |
| 37 | #define RELAY1 A0 |
| 38 | #define RELAY2 A1 |
| 39 | |
| 40 | #define LIGHT_SENSOR A2 |
| 41 | #define TEMP_SENSOR A3 |
| 42 | |
| 43 | #define BUTTON1 A6 |
| 44 | #define BUTTON2 A7 |
| 45 | #define BUTTON3 A8 |
| 46 | |
| 47 | #define JOY_SWITCH A9 // pulls line down when pressed |
| 48 | #define JOY_nINT A10 // active low interrupt input |
| 49 | #define JOY_nRESET A11 // active low reset output |
| 50 | |
| 51 | |
| 52 | MAX3421E Max; |
| 53 | USB Usb; |
| 54 | Servo servos[3]; |
| 55 | |
| 56 | |
| 57 | void setup(); |
| 58 | void loop(); |
| 59 | |
| 60 | uint8_t usbBuff[256]; |
| 61 | |
| 62 | |
| 63 | void init_buttons() |
| 64 | { |
| 65 | pinMode( BUTTON1, INPUT ); |
| 66 | pinMode( BUTTON2, INPUT ); |
| 67 | pinMode( BUTTON3, INPUT ); |
| 68 | |
| 69 | digitalWrite( BUTTON1, HIGH ); // enable the internal pullups |
| 70 | digitalWrite( BUTTON2, HIGH ); |
| 71 | digitalWrite( BUTTON3, HIGH ); |
| 72 | } |
| 73 | |
| 74 | |
| 75 | void init_relays() |
| 76 | { |
| 77 | pinMode( RELAY1, OUTPUT ); |
| 78 | pinMode( RELAY2, OUTPUT ); |
| 79 | } |
| 80 | |
| 81 | |
| 82 | void init_leds() |
| 83 | { |
| 84 | digitalWrite( LED1_RED, 1 ); |
| 85 | digitalWrite( LED1_GREEN, 1 ); |
| 86 | digitalWrite( LED1_BLUE, 1 ); |
| 87 | |
| 88 | pinMode( LED1_RED, OUTPUT ); |
| 89 | pinMode( LED1_GREEN, OUTPUT ); |
| 90 | pinMode( LED1_BLUE, OUTPUT ); |
| 91 | |
| 92 | digitalWrite( LED2_RED, 1 ); |
| 93 | digitalWrite( LED2_GREEN, 1 ); |
| 94 | digitalWrite( LED2_BLUE, 1 ); |
| 95 | |
| 96 | pinMode( LED2_RED, OUTPUT ); |
| 97 | pinMode( LED2_GREEN, OUTPUT ); |
| 98 | pinMode( LED2_BLUE, OUTPUT ); |
| 99 | |
| 100 | digitalWrite( LED3_RED, 1 ); |
| 101 | digitalWrite( LED3_GREEN, 1 ); |
| 102 | digitalWrite( LED3_BLUE, 1 ); |
| 103 | |
| 104 | pinMode( LED3_RED, OUTPUT ); |
| 105 | pinMode( LED3_GREEN, OUTPUT ); |
| 106 | pinMode( LED3_BLUE, OUTPUT ); |
| 107 | } |
| 108 | |
| 109 | void init_joystick( int threshold ); |
| 110 | |
| 111 | void setup() |
| 112 | { |
| 113 | Serial.begin( 115200 ); |
| 114 | Serial.print("\r\nStart"); |
| 115 | |
| 116 | init_leds(); |
| 117 | init_relays(); |
| 118 | init_buttons(); |
| 119 | init_joystick( 5 ); // initialize with thresholding enabled, dead zone of 5 units |
| 120 | |
| 121 | |
| 122 | servos[0].attach(SERVO1); |
| 123 | servos[0].write(90); |
| 124 | servos[1].attach(SERVO2); |
| 125 | servos[1].write(90); |
| 126 | servos[2].attach(SERVO3); |
| 127 | servos[2].write(90); |
| 128 | |
| 129 | Max.powerOn(); |
| 130 | delay( 200 ); |
| 131 | } |
| 132 | |
| 133 | bool isAndroidVendor(USB_DEVICE_DESCRIPTOR *desc) |
| 134 | { |
| 135 | return desc->idVendor == 0x18d1 || desc->idVendor == 0x22B8; |
| 136 | } |
| 137 | |
| 138 | bool isAccessoryDevice(USB_DEVICE_DESCRIPTOR *desc) |
| 139 | { |
| 140 | return desc->idProduct == 0x2D00 || desc->idProduct == 0x2D01; |
| 141 | } |
| 142 | |
| 143 | void sendString(byte addr, int index, char *str) |
| 144 | { |
| 145 | Usb.ctrlReq(addr, 0, USB_SETUP_HOST_TO_DEVICE | USB_SETUP_TYPE_VENDOR | USB_SETUP_RECIPIENT_DEVICE, |
| 146 | ACCESSORY_SEND_STRING, 0, 0, index, strlen(str) + 1, str); |
| 147 | |
| 148 | } |
| 149 | |
| 150 | void switchDevice(byte addr) |
| 151 | { |
| 152 | sendString(addr, ACCESSORY_STRING_MANUFACTURER, "Google, Inc."); |
| 153 | sendString(addr, ACCESSORY_STRING_MODEL, "DemoKit"); |
| 154 | sendString(addr, ACCESSORY_STRING_TYPE, "Sample Program"); |
| 155 | sendString(addr, ACCESSORY_STRING_VERSION, "1.0"); |
| 156 | |
| 157 | Usb.ctrlReq(addr, 0, USB_SETUP_HOST_TO_DEVICE | USB_SETUP_TYPE_VENDOR | USB_SETUP_RECIPIENT_DEVICE, |
| 158 | ACCESSORY_START, 0, 0, 0, 0, NULL); |
| 159 | } |
| 160 | |
| 161 | bool findEndpoints(byte addr, EP_RECORD *inEp, EP_RECORD *outEp) |
| 162 | { |
| 163 | int len; |
| 164 | byte err; |
| 165 | uint8_t *p; |
| 166 | |
| 167 | err = Usb.getConfDescr(addr, 0, 4, 0, (char *)usbBuff); |
| 168 | if (err) { |
| 169 | Serial.print("Can't get config descriptor length\n"); |
| 170 | return false; |
| 171 | } |
| 172 | |
| 173 | len = usbBuff[2] | ((int)usbBuff[3] << 8); |
| 174 | Serial.print("Config Desc Length: "); |
| 175 | Serial.println(len, DEC); |
| 176 | if (len > sizeof(usbBuff)) { |
| 177 | Serial.print("config descriptor too large\n"); |
| 178 | /* might want to truncate here */ |
| 179 | return false; |
| 180 | } |
| 181 | |
| 182 | err = Usb.getConfDescr(addr, 0, len, 0, (char *)usbBuff); |
| 183 | if (err) { |
| 184 | Serial.print("Can't get config descriptor\n"); |
| 185 | return false; |
| 186 | } |
| 187 | |
| 188 | p = usbBuff; |
| 189 | inEp->epAddr = 0; |
| 190 | outEp->epAddr = 0; |
| 191 | while (p < (usbBuff + len)){ |
| 192 | uint8_t descLen = p[0]; |
| 193 | uint8_t descType = p[1]; |
| 194 | USB_ENDPOINT_DESCRIPTOR *epDesc; |
| 195 | EP_RECORD *ep; |
| 196 | |
| 197 | switch (descType) { |
| 198 | case USB_DESCRIPTOR_CONFIGURATION: |
| 199 | Serial.print("config desc\n"); |
| 200 | break; |
| 201 | |
| 202 | case USB_DESCRIPTOR_INTERFACE: |
| 203 | Serial.print("interface desc\n"); |
| 204 | break; |
| 205 | |
| 206 | case USB_DESCRIPTOR_ENDPOINT: |
| 207 | epDesc = (USB_ENDPOINT_DESCRIPTOR *)p; |
| 208 | if (!inEp->epAddr && (epDesc->bEndpointAddress & 0x80)) |
| 209 | ep = inEp; |
| 210 | else if (!outEp->epAddr) |
| 211 | ep = outEp; |
| 212 | else |
| 213 | ep = NULL; |
| 214 | |
| 215 | if (ep) { |
| 216 | ep->epAddr = epDesc->bEndpointAddress & 0x7f; |
| 217 | ep->Attr = epDesc->bmAttributes; |
| 218 | ep->MaxPktSize = epDesc->wMaxPacketSize; |
| 219 | ep->sndToggle = bmSNDTOG0; |
| 220 | ep->rcvToggle = bmRCVTOG0; |
| 221 | } |
| 222 | break; |
| 223 | |
| 224 | default: |
| 225 | Serial.print("unkown desc type "); |
| 226 | Serial.println( descType, HEX); |
| 227 | break; |
| 228 | } |
| 229 | |
| 230 | p += descLen; |
| 231 | } |
| 232 | |
| 233 | return inEp->epAddr && outEp->epAddr; |
| 234 | } |
| 235 | |
| 236 | EP_RECORD ep_record[ 8 ]; //endpoint record structure for the mouse |
| 237 | |
| 238 | |
| 239 | void doAndroid(void) |
| 240 | { |
| 241 | byte err; |
| 242 | byte idle; |
| 243 | byte b1, b2, b3, c; |
| 244 | EP_RECORD inEp, outEp; |
| 245 | byte count = 0; |
| 246 | |
| 247 | if (findEndpoints(1, &inEp, &outEp)) { |
| 248 | |
| 249 | ep_record[inEp.epAddr] = inEp; |
| 250 | if (outEp.epAddr != inEp.epAddr) |
| 251 | ep_record[outEp.epAddr] = outEp; |
| 252 | |
| 253 | Serial.print("inEp: "); |
| 254 | Serial.println(inEp.epAddr, HEX); |
| 255 | Serial.print("outEp: "); |
| 256 | Serial.println(outEp.epAddr, HEX); |
| 257 | |
| 258 | ep_record[0] = *(Usb.getDevTableEntry(0,0)); |
| 259 | Usb.setDevTableEntry(1, ep_record); |
| 260 | |
| 261 | err = Usb.setConf( 1, 0, 1 ); |
| 262 | if (err) |
| 263 | Serial.print("Can't set config to 1\n"); |
| 264 | |
| 265 | Usb.setUsbTaskState( USB_STATE_RUNNING ); |
| 266 | |
| 267 | b1 = digitalRead(BUTTON1); |
| 268 | b2 = digitalRead(BUTTON2); |
| 269 | b3 = digitalRead(BUTTON3); |
| 270 | c = captouched(); |
| 271 | |
| 272 | while(1) { |
| 273 | int len = Usb.newInTransfer(1, inEp.epAddr, sizeof(usbBuff), |
| 274 | (char *)usbBuff, 1); |
| 275 | int i; |
| 276 | byte b; |
| 277 | byte msg[3]; |
| 278 | msg[0] = 0x1; |
| 279 | |
| 280 | if (len > 0) { |
| 281 | // XXX: assumes only one command per packet |
| 282 | Serial.print(usbBuff[0], HEX); |
| 283 | Serial.print(":"); |
| 284 | Serial.print(usbBuff[1], HEX); |
| 285 | Serial.print(":"); |
| 286 | Serial.println(usbBuff[2], HEX); |
| 287 | if (usbBuff[0] == 0x2) { |
| 288 | if (usbBuff[1] == 0x0) |
| 289 | analogWrite( LED1_RED, 255 - usbBuff[2]); |
| 290 | else if (usbBuff[1] == 0x1) |
| 291 | analogWrite( LED1_GREEN, 255 - usbBuff[2]); |
| 292 | else if (usbBuff[1] == 0x2) |
| 293 | analogWrite( LED1_BLUE, 255 - usbBuff[2]); |
| 294 | else if (usbBuff[1] == 0x3) |
| 295 | analogWrite( LED2_RED, 255 - usbBuff[2]); |
| 296 | else if (usbBuff[1] == 0x4) |
| 297 | analogWrite( LED2_GREEN, 255 - usbBuff[2]); |
| 298 | else if (usbBuff[1] == 0x5) |
| 299 | analogWrite( LED2_BLUE, 255 - usbBuff[2]); |
| 300 | else if (usbBuff[1] == 0x6) |
| 301 | analogWrite( LED3_RED, 255 - usbBuff[2]); |
| 302 | else if (usbBuff[1] == 0x7) |
| 303 | analogWrite( LED3_GREEN, 255 - usbBuff[2]); |
| 304 | else if (usbBuff[1] == 0x8) |
| 305 | analogWrite( LED3_BLUE, 255 - usbBuff[2]); |
| 306 | else if (usbBuff[1] == 0x10) |
| 307 | servos[0].write(map(usbBuff[2], 0, 255, 0, 180)); |
| 308 | else if (usbBuff[1] == 0x11) |
| 309 | servos[1].write(map(usbBuff[2], 0, 255, 0, 180)); |
| 310 | else if (usbBuff[1] == 0x12) |
| 311 | servos[2].write(map(usbBuff[2], 0, 255, 0, 180)); |
| 312 | } else if (usbBuff[0] == 0x3) { |
| 313 | if (usbBuff[1] == 0x0) |
| 314 | digitalWrite( RELAY1, usbBuff[2] ? HIGH : LOW ); |
| 315 | else if (usbBuff[1] == 0x1) |
| 316 | digitalWrite( RELAY2, usbBuff[2] ? HIGH : LOW ); |
| 317 | |
| 318 | } |
| 319 | |
| 320 | // for (i = 0; i < len; i++) |
| 321 | // Serial.print('\n'); |
| 322 | } |
| 323 | |
| 324 | b = digitalRead(BUTTON1); |
| 325 | if (b != b1) { |
| 326 | msg[1] = 0; |
| 327 | msg[2] = b ? 0 : 1; |
| 328 | Usb.outTransfer(1, outEp.epAddr, 3, (char *)msg); |
| 329 | b1 = b; |
| 330 | } |
| 331 | |
| 332 | b = digitalRead(BUTTON2); |
| 333 | if (b != b2) { |
| 334 | msg[1] = 1; |
| 335 | msg[2] = b ? 0 : 1; |
| 336 | Usb.outTransfer(1, outEp.epAddr, 3, (char *)msg); |
| 337 | b2 = b; |
| 338 | } |
| 339 | |
| 340 | b = digitalRead(BUTTON3); |
| 341 | if (b != b3) { |
| 342 | msg[1] = 2; |
| 343 | msg[2] = b ? 0 : 1; |
| 344 | Usb.outTransfer(1, outEp.epAddr, 3, (char *)msg); |
| 345 | b3 = b; |
| 346 | } |
| 347 | |
| 348 | if ((count++ % 16) == 0) { |
| 349 | uint16_t val; |
| 350 | int x, y; |
| 351 | |
| 352 | val = analogRead(TEMP_SENSOR); |
| 353 | msg[0] = 0x4; |
| 354 | msg[1] = val >> 8; |
| 355 | msg[2] = val & 0xff; |
| 356 | Usb.outTransfer(1, outEp.epAddr, 3, (char *)msg); |
| 357 | |
| 358 | val = analogRead(LIGHT_SENSOR); |
| 359 | msg[0] = 0x5; |
| 360 | msg[1] = val >> 8; |
| 361 | msg[2] = val & 0xff; |
| 362 | Usb.outTransfer(1, outEp.epAddr, 3, (char *)msg); |
| 363 | |
| 364 | read_joystick(&x, &y); |
| 365 | msg[0] = 0x6; |
| 366 | msg[1] = constrain(x, -128, 127); |
| 367 | msg[2] = constrain(y, -128, 127); |
| 368 | Usb.outTransfer(1, outEp.epAddr, 3, (char *)msg); |
| 369 | |
| 370 | char c0 = captouched(); |
| 371 | if (c0 != c) { |
| 372 | msg[0] = 0x1; |
| 373 | msg[1] = 3; |
| 374 | msg[2] = c0 ? 0 : 1; |
| 375 | Usb.outTransfer(1, outEp.epAddr, 3, (char *)msg); |
| 376 | c = c0; |
| 377 | } |
| 378 | } |
| 379 | |
| 380 | delay(10); |
| 381 | |
| 382 | } |
| 383 | |
| 384 | } |
| 385 | |
| 386 | } |
| 387 | |
| 388 | |
| 389 | void loop() |
| 390 | { |
| 391 | USB_DEVICE_DESCRIPTOR *devDesc = (USB_DEVICE_DESCRIPTOR *) usbBuff; |
| 392 | byte err; |
| 393 | |
| 394 | Max.Task(); |
| 395 | Usb.Task(); |
| 396 | if( Usb.getUsbTaskState() >= USB_STATE_CONFIGURING ) { |
| 397 | Serial.print("\nDevice addressed... "); |
| 398 | Serial.print("Requesting device descriptor."); |
| 399 | |
| 400 | err = Usb.getDevDescr(1, 0, 0x12, (char *) devDesc); |
| 401 | if (err) { |
| 402 | Serial.print("\nDevice descriptor cannot be retrieved. Program Halted\n"); |
| 403 | while(1); |
| 404 | } |
| 405 | |
| 406 | if (isAndroidVendor(devDesc)) { |
| 407 | Serial.print("found android device\n"); |
| 408 | |
| 409 | if (isAccessoryDevice(devDesc)) { |
| 410 | Serial.print("found android acessory device\n"); |
| 411 | doAndroid(); |
| 412 | } else { |
| 413 | Serial.print("found possible device. swithcing to serial mode\n"); |
| 414 | switchDevice(1); |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | while (Usb.getUsbTaskState() != USB_DETACHED_SUBSTATE_WAIT_FOR_DEVICE) { |
| 419 | Max.Task(); |
| 420 | Usb.Task(); |
| 421 | |
| 422 | |
| 423 | } |
| 424 | |
| 425 | Serial.print("detached\n"); |
| 426 | |
| 427 | } |
| 428 | |
| 429 | } |
| 430 | |
| 431 | // ============================================================================== |
| 432 | // Austria Microsystems i2c Joystick |
| 433 | |
| 434 | /* |
| 435 | If a threshold is provided, the dead zone will be programmed such that interrupts will not |
| 436 | be generated unless the threshold is exceeded. |
| 437 | |
| 438 | Note that if you use that mode, you will have to use passage of time with no new interrupts |
| 439 | to detect that the stick has been released and has returned to center. |
| 440 | |
| 441 | If you need to explicitly track return to center, pass 0 as the threshold. "Center" will |
| 442 | still bounce around a little |
| 443 | */ |
| 444 | |
| 445 | |
| 446 | void init_joystick( int threshold ) |
| 447 | { |
| 448 | byte status = 0; |
| 449 | |
| 450 | pinMode( JOY_SWITCH, INPUT ); |
| 451 | digitalWrite( JOY_SWITCH, HIGH ); // enable the internal pullup |
| 452 | |
| 453 | pinMode( JOY_nINT, INPUT ); |
| 454 | digitalWrite( JOY_nINT, HIGH ); // enable the internal pullup |
| 455 | |
| 456 | pinMode( JOY_nRESET, OUTPUT ); |
| 457 | |
| 458 | digitalWrite( JOY_nRESET, 1 ); |
| 459 | delay(1); |
| 460 | digitalWrite( JOY_nRESET, 0 ); |
| 461 | delay(1); |
| 462 | digitalWrite( JOY_nRESET, 1 ); |
| 463 | |
| 464 | Wire.begin(); |
| 465 | |
| 466 | do { |
| 467 | status = read_joy_reg( 0x0f ); // XXX need timeout |
| 468 | } while ((status & 0xf0) != 0xf0); |
| 469 | |
| 470 | write_joy_reg( 0x2e, 0x86 ); // invert magnet polarity setting, per datasheet |
| 471 | |
| 472 | calibrate_joystick( threshold ); // calibrate & set up dead zone area |
| 473 | } |
| 474 | |
| 475 | |
| 476 | int offset_X, offset_Y; |
| 477 | |
| 478 | void calibrate_joystick( int dz ) |
| 479 | { |
| 480 | char iii; |
| 481 | int x_cal = 0; |
| 482 | int y_cal = 0; |
| 483 | |
| 484 | write_joy_reg( 0x0f, 0x00 ); // Low Power Mode, 20ms auto wakeup |
| 485 | // INTn output enabled |
| 486 | // INTn active after each measurement |
| 487 | // Normal (non-Reset) mode |
| 488 | delay(1); |
| 489 | |
| 490 | read_joy_reg( 0x11 ); // dummy read of Y_reg to reset interrupt |
| 491 | |
| 492 | for( iii = 0; iii != 16; iii++ ) { // read coords 16 times & average |
| 493 | while( !joystick_interrupt() ) // poll for interrupt |
| 494 | ; |
| 495 | x_cal += read_joy_reg( 0x10 ); // X pos |
| 496 | y_cal += read_joy_reg( 0x11 ); // Y pos |
| 497 | } |
| 498 | |
| 499 | offset_X = -(x_cal>>4); // divide by 16 to get average |
| 500 | offset_Y = -(y_cal>>4); |
| 501 | |
| 502 | //sprintf(msgbuf, "offsets = %d, %d\n", offset_X, offset_Y); |
| 503 | //Serial.print(msgbuf); |
| 504 | |
| 505 | write_joy_reg( 0x12, dz - offset_X ); // Xp, LEFT threshold for INTn |
| 506 | write_joy_reg( 0x13, -dz - offset_X ); // Xn, RIGHT threshold for INTn |
| 507 | write_joy_reg( 0x14, dz - offset_Y ); // Yp, UP threshold for INTn |
| 508 | write_joy_reg( 0x15, -dz - offset_Y ); // Yn, DOWN threshold for INTn |
| 509 | |
| 510 | if ( dz ) // dead zone threshold detect requested? |
| 511 | write_joy_reg( 0x0f, 0x04 ); // Low Power Mode, 20ms auto wakeup |
| 512 | // INTn output enabled |
| 513 | // INTn active when movement exceeds dead zone |
| 514 | // Normal (non-Reset) mode |
| 515 | } |
| 516 | |
| 517 | |
| 518 | void read_joystick( int *x, int *y ) |
| 519 | { |
| 520 | *x = read_joy_reg( 0x10 ) + offset_X; |
| 521 | *y = read_joy_reg( 0x11 ) + offset_Y; // reading Y clears the interrupt |
| 522 | } |
| 523 | |
| 524 | char joystick_interrupt() |
| 525 | { |
| 526 | return ( digitalRead( JOY_nINT ) == 0 ); |
| 527 | } |
| 528 | |
| 529 | |
| 530 | #define JOY_I2C_ADDR 0x40 |
| 531 | |
| 532 | char read_joy_reg( char reg_addr ) |
| 533 | { |
| 534 | char c; |
| 535 | |
| 536 | Wire.beginTransmission( JOY_I2C_ADDR ); |
| 537 | Wire.send( reg_addr ); |
| 538 | Wire.endTransmission(); |
| 539 | |
| 540 | Wire.requestFrom( JOY_I2C_ADDR, 1 ); |
| 541 | |
| 542 | while(Wire.available()) |
| 543 | c = Wire.receive(); |
| 544 | |
| 545 | return c; |
| 546 | } |
| 547 | |
| 548 | void write_joy_reg( char reg_addr, char val ) |
| 549 | { |
| 550 | Wire.beginTransmission( JOY_I2C_ADDR ); |
| 551 | Wire.send( reg_addr ); |
| 552 | Wire.send( val ); |
| 553 | Wire.endTransmission(); |
| 554 | } |
| 555 | |
| 556 | /* Capacitive touch technique from Mario Becker, Fraunhofer IGD, 2007 http://www.igd.fhg.de/igd-a4 */ |
| 557 | |
| 558 | char captouched() |
| 559 | { |
| 560 | char iii, jjj, retval; |
| 561 | |
| 562 | retval = 0; |
| 563 | |
| 564 | for( jjj = 0; jjj != 10; jjj++ ) { |
| 565 | delay( 10 ); |
| 566 | |
| 567 | pinMode( TOUCH, INPUT ); |
| 568 | digitalWrite( TOUCH, HIGH ); |
| 569 | |
| 570 | for ( iii = 0; iii < 16; iii++ ) |
| 571 | if( digitalRead( TOUCH ) ) |
| 572 | break; |
| 573 | |
| 574 | digitalWrite( TOUCH, LOW ); |
| 575 | pinMode( TOUCH, OUTPUT ); |
| 576 | |
| 577 | retval += iii; |
| 578 | } |
| 579 | |
| 580 | return retval; |
| 581 | } |