| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 Sam Lantinga |
| 4 | |
| 5 | This library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | This library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with this library; if not, write to the Free Software |
| 17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | |
| 19 | Sam Lantinga |
| 20 | slouken@libsdl.org |
| 21 | */ |
| 22 | #include "SDL_config.h" |
| 23 | |
| 24 | #include <unistd.h> |
| 25 | #include <sys/time.h> |
| 26 | #include <ctype.h> |
| 27 | |
| 28 | #include "SDL_stdinc.h" |
| 29 | #include "SDL_fbvideo.h" |
| 30 | #include "SDL_fbelo.h" |
| 31 | |
| 32 | /* |
| 33 | calibration default values |
| 34 | values are read from the following environment variables: |
| 35 | |
| 36 | SDL_ELO_MIN_X |
| 37 | SDL_ELO_MAX_X |
| 38 | SDL_ELO_MIN_Y |
| 39 | SDL_ELO_MAX_Y |
| 40 | */ |
| 41 | |
| 42 | static int ELO_MIN_X = 400; |
| 43 | static int ELO_MAX_X = 3670; |
| 44 | static int ELO_MIN_Y = 500; |
| 45 | static int ELO_MAX_Y = 3540; |
| 46 | |
| 47 | #define ELO_SNAP_SIZE 6 |
| 48 | #define ELO_TOUCH_BYTE 'T' |
| 49 | #define ELO_ID 'I' |
| 50 | #define ELO_MODE 'M' |
| 51 | #define ELO_PARAMETER 'P' |
| 52 | #define ELO_REPORT 'B' |
| 53 | #define ELO_ACK 'A' |
| 54 | |
| 55 | #define ELO_INIT_CHECKSUM 0xAA |
| 56 | |
| 57 | #define ELO_BTN_PRESS 0x01 |
| 58 | #define ELO_STREAM 0x02 |
| 59 | #define ELO_BTN_RELEASE 0x04 |
| 60 | |
| 61 | #define ELO_TOUCH_MODE 0x01 |
| 62 | #define ELO_STREAM_MODE 0x02 |
| 63 | #define ELO_UNTOUCH_MODE 0x04 |
| 64 | #define ELO_RANGE_CHECK_MODE 0x40 |
| 65 | #define ELO_TRIM_MODE 0x02 |
| 66 | #define ELO_CALIB_MODE 0x04 |
| 67 | #define ELO_SCALING_MODE 0x08 |
| 68 | #define ELO_TRACKING_MODE 0x40 |
| 69 | |
| 70 | #define ELO_SERIAL_MASK 0xF8 |
| 71 | |
| 72 | #define ELO_SERIAL_IO '0' |
| 73 | |
| 74 | #define ELO_MAX_TRIALS 3 |
| 75 | #define ELO_MAX_WAIT 100000 |
| 76 | #define ELO_UNTOUCH_DELAY 5 |
| 77 | #define ELO_REPORT_DELAY 1 |
| 78 | |
| 79 | /* eloParsePacket |
| 80 | */ |
| 81 | int eloParsePacket(unsigned char* mousebuf, int* dx, int* dy, int* button_state) { |
| 82 | static int elo_button = 0; |
| 83 | static int last_x = 0; |
| 84 | static int last_y = 0; |
| 85 | int x,y; |
| 86 | |
| 87 | /* Check if we have a touch packet */ |
| 88 | if (mousebuf[1] != ELO_TOUCH_BYTE) { |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | x = ((mousebuf[4] << 8) | mousebuf[3]); |
| 93 | y = ((mousebuf[6] << 8) | mousebuf[5]); |
| 94 | |
| 95 | if((SDL_abs(x - last_x) > ELO_SNAP_SIZE) || (SDL_abs(y - last_y) > ELO_SNAP_SIZE)) { |
| 96 | *dx = ((mousebuf[4] << 8) | mousebuf[3]); |
| 97 | *dy = ((mousebuf[6] << 8) | mousebuf[5]); |
| 98 | } |
| 99 | else { |
| 100 | *dx = last_x; |
| 101 | *dy = last_y; |
| 102 | } |
| 103 | |
| 104 | last_x = *dx; |
| 105 | last_y = *dy; |
| 106 | |
| 107 | if ( (mousebuf[2] & 0x07) == ELO_BTN_PRESS ) { |
| 108 | elo_button = 1; |
| 109 | } |
| 110 | if ( (mousebuf[2] & 0x07) == ELO_BTN_RELEASE ) { |
| 111 | elo_button = 0; |
| 112 | } |
| 113 | |
| 114 | *button_state = elo_button; |
| 115 | return 1; |
| 116 | } |
| 117 | |
| 118 | /* Convert the raw coordinates from the ELO controller |
| 119 | to a screen position. |
| 120 | */ |
| 121 | void eloConvertXY(_THIS, int *dx, int *dy) { |
| 122 | int input_x = *dx; |
| 123 | int input_y = *dy; |
| 124 | int width = ELO_MAX_X - ELO_MIN_X; |
| 125 | int height = ELO_MAX_Y - ELO_MIN_Y; |
| 126 | |
| 127 | *dx = ((int)cache_vinfo.xres - ((int)cache_vinfo.xres * (input_x - ELO_MIN_X)) / width); |
| 128 | *dy = (cache_vinfo.yres * (input_y - ELO_MIN_Y)) / height; |
| 129 | } |
| 130 | |
| 131 | |
| 132 | /* eloGetPacket |
| 133 | */ |
| 134 | int eloGetPacket(unsigned char* buffer, int* buffer_p, int* checksum, int fd) { |
| 135 | int num_bytes; |
| 136 | int ok; |
| 137 | |
| 138 | if(fd == 0) { |
| 139 | num_bytes = ELO_PACKET_SIZE; |
| 140 | } |
| 141 | else { |
| 142 | num_bytes = read(fd, |
| 143 | (char *) (buffer + *buffer_p), |
| 144 | ELO_PACKET_SIZE - *buffer_p); |
| 145 | } |
| 146 | |
| 147 | if (num_bytes < 0) { |
| 148 | #ifdef DEBUG_MOUSE |
| 149 | fprintf(stderr, "System error while reading from Elographics touchscreen.\n"); |
| 150 | #endif |
| 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | while (num_bytes) { |
| 155 | if ((*buffer_p == 0) && (buffer[0] != ELO_START_BYTE)) { |
| 156 | SDL_memcpy(&buffer[0], &buffer[1], num_bytes-1); |
| 157 | } |
| 158 | else { |
| 159 | if (*buffer_p < ELO_PACKET_SIZE-1) { |
| 160 | *checksum = *checksum + buffer[*buffer_p]; |
| 161 | *checksum = *checksum % 256; |
| 162 | } |
| 163 | (*buffer_p)++; |
| 164 | } |
| 165 | num_bytes--; |
| 166 | } |
| 167 | |
| 168 | if (*buffer_p == ELO_PACKET_SIZE) { |
| 169 | ok = (*checksum == buffer[ELO_PACKET_SIZE-1]); |
| 170 | *checksum = ELO_INIT_CHECKSUM; |
| 171 | *buffer_p = 0; |
| 172 | |
| 173 | if (!ok) { |
| 174 | return 0; |
| 175 | } |
| 176 | |
| 177 | return 1; |
| 178 | } |
| 179 | else { |
| 180 | return 0; |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | /* eloSendPacket |
| 185 | */ |
| 186 | |
| 187 | int eloSendPacket(unsigned char* packet, int fd) |
| 188 | { |
| 189 | int i, result; |
| 190 | int sum = ELO_INIT_CHECKSUM; |
| 191 | |
| 192 | packet[0] = ELO_START_BYTE; |
| 193 | for (i = 0; i < ELO_PACKET_SIZE-1; i++) { |
| 194 | sum += packet[i]; |
| 195 | sum &= 0xFF; |
| 196 | } |
| 197 | packet[ELO_PACKET_SIZE-1] = sum; |
| 198 | |
| 199 | result = write(fd, packet, ELO_PACKET_SIZE); |
| 200 | |
| 201 | if (result != ELO_PACKET_SIZE) { |
| 202 | #ifdef DEBUG_MOUSE |
| 203 | printf("System error while sending to Elographics touchscreen.\n"); |
| 204 | #endif |
| 205 | return 0; |
| 206 | } |
| 207 | else { |
| 208 | return 1; |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | |
| 213 | /* eloWaitForInput |
| 214 | */ |
| 215 | int eloWaitForInput(int fd, int timeout) |
| 216 | { |
| 217 | fd_set readfds; |
| 218 | struct timeval to; |
| 219 | int r; |
| 220 | |
| 221 | FD_ZERO(&readfds); |
| 222 | FD_SET(fd, &readfds); |
| 223 | to.tv_sec = 0; |
| 224 | to.tv_usec = timeout; |
| 225 | |
| 226 | r = select(FD_SETSIZE, &readfds, NULL, NULL, &to); |
| 227 | return r; |
| 228 | } |
| 229 | |
| 230 | /* eloWaitReply |
| 231 | */ |
| 232 | int eloWaitReply(unsigned char type, unsigned char *reply, int fd) { |
| 233 | int ok; |
| 234 | int i, result; |
| 235 | int reply_p = 0; |
| 236 | int sum = ELO_INIT_CHECKSUM; |
| 237 | |
| 238 | i = ELO_MAX_TRIALS; |
| 239 | do { |
| 240 | ok = 0; |
| 241 | |
| 242 | result = eloWaitForInput(fd, ELO_MAX_WAIT); |
| 243 | |
| 244 | if (result > 0) { |
| 245 | ok = eloGetPacket(reply, &reply_p, &sum, fd); |
| 246 | |
| 247 | if (ok && reply[1] != type && type != ELO_PARAMETER) { |
| 248 | #ifdef DEBUG_MOUSE |
| 249 | fprintf(stderr, "Wrong reply received\n"); |
| 250 | #endif |
| 251 | ok = 0; |
| 252 | } |
| 253 | } |
| 254 | else { |
| 255 | #ifdef DEBUG_MOUSE |
| 256 | fprintf(stderr, "No input!\n"); |
| 257 | #endif |
| 258 | } |
| 259 | |
| 260 | if (result == 0) { |
| 261 | i--; |
| 262 | } |
| 263 | } while(!ok && (i>0)); |
| 264 | |
| 265 | return ok; |
| 266 | } |
| 267 | |
| 268 | |
| 269 | /* eloWaitAck |
| 270 | */ |
| 271 | |
| 272 | int eloWaitAck(int fd) { |
| 273 | unsigned char packet[ELO_PACKET_SIZE]; |
| 274 | int i, nb_errors; |
| 275 | |
| 276 | if (eloWaitReply(ELO_ACK, packet, fd)) { |
| 277 | for (i = 0, nb_errors = 0; i < 4; i++) { |
| 278 | if (packet[2 + i] != '0') { |
| 279 | nb_errors++; |
| 280 | } |
| 281 | } |
| 282 | |
| 283 | if (nb_errors != 0) { |
| 284 | #ifdef DEBUG_MOUSE |
| 285 | fprintf(stderr, "Elographics acknowledge packet reports %d errors\n", nb_errors); |
| 286 | #endif |
| 287 | } |
| 288 | return 1; |
| 289 | } |
| 290 | else { |
| 291 | return 0; |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | |
| 296 | /* eloSendQuery -- |
| 297 | */ |
| 298 | int eloSendQuery(unsigned char *request, unsigned char* reply, int fd) { |
| 299 | int ok; |
| 300 | |
| 301 | if (eloSendPacket(request, fd)) { |
| 302 | ok = eloWaitReply(toupper(request[1]), reply, fd); |
| 303 | if (ok) { |
| 304 | ok = eloWaitAck(fd); |
| 305 | } |
| 306 | return ok; |
| 307 | } |
| 308 | else { |
| 309 | return 0; |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | |
| 314 | /* eloSendControl |
| 315 | */ |
| 316 | int eloSendControl(unsigned char* control, int fd) { |
| 317 | if (eloSendPacket(control, fd)) { |
| 318 | return eloWaitAck(fd); |
| 319 | } |
| 320 | else { |
| 321 | return 0; |
| 322 | } |
| 323 | } |
| 324 | |
| 325 | /* eloInitController |
| 326 | */ |
| 327 | int eloInitController(int fd) { |
| 328 | unsigned char req[ELO_PACKET_SIZE]; |
| 329 | unsigned char reply[ELO_PACKET_SIZE]; |
| 330 | const char *buffer = NULL; |
| 331 | int result = 0; |
| 332 | |
| 333 | struct termios mouse_termios; |
| 334 | |
| 335 | /* try to read the calibration values */ |
| 336 | buffer = SDL_getenv("SDL_ELO_MIN_X"); |
| 337 | if(buffer) { |
| 338 | ELO_MIN_X = SDL_atoi(buffer); |
| 339 | } |
| 340 | buffer = SDL_getenv("SDL_ELO_MAX_X"); |
| 341 | if(buffer) { |
| 342 | ELO_MAX_X = SDL_atoi(buffer); |
| 343 | } |
| 344 | buffer = SDL_getenv("SDL_ELO_MIN_Y"); |
| 345 | if(buffer) { |
| 346 | ELO_MIN_Y = SDL_atoi(buffer); |
| 347 | } |
| 348 | buffer = SDL_getenv("SDL_ELO_MAX_Y"); |
| 349 | if(buffer) { |
| 350 | ELO_MAX_Y = SDL_atoi(buffer); |
| 351 | } |
| 352 | |
| 353 | #ifdef DEBUG_MOUSE |
| 354 | fprintf( stderr, "ELO calibration values:\nmin_x: %i\nmax_x: %i\nmin_y: %i\nmax_y: %i\n", |
| 355 | ELO_MIN_X, |
| 356 | ELO_MAX_X, |
| 357 | ELO_MIN_Y, |
| 358 | ELO_MAX_Y); |
| 359 | #endif |
| 360 | |
| 361 | /* set comm params */ |
| 362 | SDL_memset(&mouse_termios, 0, sizeof(mouse_termios)); |
| 363 | mouse_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL; |
| 364 | mouse_termios.c_cc[VMIN] = 1; |
| 365 | result = tcsetattr(fd, TCSANOW, &mouse_termios); |
| 366 | |
| 367 | if (result < 0) { |
| 368 | #ifdef DEBUG_MOUSE |
| 369 | fprintf( stderr, "Unable to configure Elographics touchscreen port\n"); |
| 370 | #endif |
| 371 | return 0; |
| 372 | } |
| 373 | |
| 374 | SDL_memset(req, 0, ELO_PACKET_SIZE); |
| 375 | req[1] = tolower(ELO_PARAMETER); |
| 376 | if (!eloSendQuery(req, reply, fd)) { |
| 377 | #ifdef DEBUG_MOUSE |
| 378 | fprintf( stderr, "Not at the specified rate or model 2310, will continue\n"); |
| 379 | #endif |
| 380 | } |
| 381 | |
| 382 | SDL_memset(req, 0, ELO_PACKET_SIZE); |
| 383 | req[1] = tolower(ELO_ID); |
| 384 | if (eloSendQuery(req, reply, fd)) { |
| 385 | #ifdef DEBUG_MOUSE |
| 386 | fprintf(stderr, "Ok, controller configured!\n"); |
| 387 | #endif |
| 388 | } |
| 389 | else { |
| 390 | #ifdef DEBUG_MOUSE |
| 391 | fprintf( stderr, "Unable to ask Elographics touchscreen identification\n"); |
| 392 | #endif |
| 393 | return 0; |
| 394 | } |
| 395 | |
| 396 | SDL_memset(req, 0, ELO_PACKET_SIZE); |
| 397 | req[1] = ELO_MODE; |
| 398 | req[3] = ELO_TOUCH_MODE | ELO_STREAM_MODE | ELO_UNTOUCH_MODE; |
| 399 | req[4] = ELO_TRACKING_MODE; |
| 400 | if (!eloSendControl(req, fd)) { |
| 401 | #ifdef DEBUG_MOUSE |
| 402 | fprintf( stderr, "Unable to change Elographics touchscreen operating mode\n"); |
| 403 | #endif |
| 404 | return 0; |
| 405 | } |
| 406 | |
| 407 | SDL_memset(req, 0, ELO_PACKET_SIZE); |
| 408 | req[1] = ELO_REPORT; |
| 409 | req[2] = ELO_UNTOUCH_DELAY; |
| 410 | req[3] = ELO_REPORT_DELAY; |
| 411 | if (!eloSendControl(req, fd)) { |
| 412 | #ifdef DEBUG_MOUSE |
| 413 | fprintf( stderr, "Unable to change Elographics touchscreen reports timings\n"); |
| 414 | #endif |
| 415 | return 0; |
| 416 | } |
| 417 | |
| 418 | return 1; |
| 419 | } |
| 420 | |
| 421 | int eloReadPosition(_THIS, int fd, int* x, int* y, int* button_state, int* realx, int* realy) { |
| 422 | unsigned char buffer[ELO_PACKET_SIZE]; |
| 423 | int pointer = 0; |
| 424 | int checksum = ELO_INIT_CHECKSUM; |
| 425 | |
| 426 | while(pointer < ELO_PACKET_SIZE) { |
| 427 | if(eloGetPacket(buffer, &pointer, &checksum, fd)) { |
| 428 | break; |
| 429 | } |
| 430 | } |
| 431 | |
| 432 | if(!eloParsePacket(buffer, realx, realy, button_state)) { |
| 433 | return 0; |
| 434 | } |
| 435 | |
| 436 | *x = *realx; |
| 437 | *y = *realy; |
| 438 | |
| 439 | eloConvertXY(this, x, y); |
| 440 | |
| 441 | return 1; |
| 442 | } |