main.c

   1 /*
   2  * TeensyTAS, TAS input player for MegaDrive
   3  * Copyright (c) 2014 notaz
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining
   6  * a copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sublicense, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be
  14  * included in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  17  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  19  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  20  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  21  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
  24  */
  25
  26 #include <stdint.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include "teensy3/core_pins.h"
  30 #include "teensy3/usb_seremu.h"
  31 #include "teensy3/usb_rawhid.h"
  32 #include "pkts.h"
  33
  34 #define noinline __attribute__((noinline))
  35
  36 // use power of 2
  37 #define STREAM_BUF_SIZE 512
  38 #define STREAM_BUF_MASK (512 - 1)
  39
  40 /* ?0SA 00DU, ?1CB RLDU */
  41 #define STREAM_EL_SZ 2
  42
  43 static struct {
  44         uint8_t stream_to[STREAM_BUF_SIZE][STREAM_EL_SZ];
  45         uint8_t stream_from[STREAM_BUF_SIZE][STREAM_EL_SZ];
  46         union {
  47                 uint8_t fixed_state[4];
  48                 uint32_t fixed_state32;
  49         };
  50         union {
  51                 uint8_t pending_state[4];
  52                 uint32_t pending_state32;
  53         };
  54         uint32_t stream_enable_to:1;
  55         uint32_t stream_enable_from:1;
  56         uint32_t stream_started:1;
  57         uint32_t stream_ended:1;
  58         uint32_t use_readinc:1;
  59         uint32_t use_pending:1;
  60         uint32_t frame_cnt;
  61         uint32_t edge_cnt;
  62         uint32_t t_i;
  63         uint32_t t_o;
  64         uint32_t f_i;
  65         uint32_t f_o;
  66 } g;
  67
  68 ssize_t _write(int fd, const void *buf, size_t nbyte)
  69 {
  70         char tbuf[64];
  71         int ret;
  72
  73         if (fd != 1 && fd != 2) {
  74                 snprintf(tbuf, sizeof(tbuf), "write to fd %d\n", fd);
  75                 usb_seremu_write(tbuf, strlen(tbuf));
  76         }
  77
  78         ret = usb_seremu_write(buf, nbyte);
  79         return ret < 0 ? ret : nbyte;
  80 }
  81
  82 void yield(void)
  83 {
  84 }
  85
  86 /* portb handles TH */
  87 static void portb_isr_fixed(void)
  88 {
  89         uint32_t isfr, th;
  90
  91         isfr = PORTB_ISFR;
  92         PORTB_ISFR = isfr;
  93         th = (GPIOB_PDIR >> CORE_PIN0_BIT) & 1;
  94
  95         GPIOD_PDOR = g.fixed_state[th];
  96         g.edge_cnt++;
  97 }
  98
  99 static noinline void do_to_step(void)
 100 {
 101         g.frame_cnt++;
 102
 103         g.t_o = (g.t_o + 1) & STREAM_BUF_MASK;
 104         if (g.t_o == g.t_i)
 105                 // done
 106                 attachInterruptVector(IRQ_PORTB, portb_isr_fixed);
 107 }
 108
 109 static void portb_isr_do_to_inc(void)
 110 {
 111         uint32_t isfr, th;
 112
 113         isfr = PORTB_ISFR;
 114         PORTB_ISFR = isfr;
 115         th = (GPIOB_PDIR >> CORE_PIN0_BIT) & 1;
 116
 117         GPIOD_PDOR = g.stream_to[g.t_o][th];
 118         if (th)
 119                 do_to_step();
 120 }
 121
 122 static void portb_isr_do_to(void)
 123 {
 124         uint32_t isfr, th;
 125
 126         isfr = PORTB_ISFR;
 127         PORTB_ISFR = isfr;
 128         th = (GPIOB_PDIR >> CORE_PIN0_BIT) & 1;
 129
 130         GPIOD_PDOR = g.stream_to[g.t_o][th];
 131         g.edge_cnt++;
 132 }
 133
 134 static void portc_isr_nop(void)
 135 {
 136         uint32_t isfr;
 137
 138         isfr = PORTC_ISFR;
 139         PORTC_ISFR = isfr;
 140 }
 141
 142 // /vsync starts at line 235/259 (ntsc/pal), just as vcounter jumps back
 143 // we care when it comes out (/vsync goes high) after 3 lines at 238/262
 144 static void portc_isr_frameinc(void)
 145 {
 146         uint32_t isfr;
 147
 148         isfr = PORTC_ISFR;
 149         PORTC_ISFR = isfr;
 150
 151         g.t_o = (g.t_o + 1) & STREAM_BUF_MASK;
 152         if (g.t_o == g.t_i) {
 153                 attachInterruptVector(IRQ_PORTB, portb_isr_fixed);
 154                 attachInterruptVector(IRQ_PORTC, portc_isr_nop);
 155         }
 156         g.frame_cnt++;
 157 }
 158
 159 /* "recording" data */
 160 static noinline void do_from_step(void)
 161 {
 162         uint32_t s;
 163
 164         // should hopefully give atomic fixed_state read..
 165         s = g.fixed_state32;
 166         g.fixed_state32 = g.pending_state32;
 167         g.stream_from[g.f_i][0] = s;
 168         g.stream_from[g.f_i][1] = s >> 8;
 169         g.f_i = (g.f_i + 1) & STREAM_BUF_MASK;
 170 }
 171
 172 static void portb_isr_fixed_do_from(void)
 173 {
 174         uint32_t isfr, th;
 175
 176         isfr = PORTB_ISFR;
 177         PORTB_ISFR = isfr;
 178         th = (GPIOB_PDIR >> CORE_PIN0_BIT) & 1;
 179
 180         GPIOD_PDOR = g.fixed_state[th];
 181         if (th)
 182                 do_from_step();
 183         g.edge_cnt++;
 184 }
 185
 186 static void portc_isr_frameinc_do_from(void)
 187 {
 188         uint32_t isfr;
 189
 190         isfr = PORTC_ISFR;
 191         PORTC_ISFR = isfr;
 192
 193         do_from_step();
 194         g.frame_cnt++;
 195 }
 196
 197 static void udelay(uint32_t us)
 198 {
 199         uint32_t start = micros();
 200
 201         while ((micros() - start) < us) {
 202                 asm volatile("nop; nop; nop; nop");
 203                 yield();
 204         }
 205 }
 206
 207 static void do_start_seq(void)
 208 {
 209         uint32_t edge_cnt_last;
 210         uint32_t edge_cnt;
 211         uint32_t start, t1, t2;
 212         int tout;
 213
 214         start = micros();
 215         edge_cnt = g.edge_cnt;
 216
 217         /* magic value */
 218         g.fixed_state[0] =
 219         g.fixed_state[1] = 0x25;
 220
 221         for (tout = 10000; tout > 0; tout--) {
 222                 edge_cnt_last = edge_cnt;
 223                 udelay(100);
 224                 edge_cnt = g.edge_cnt;
 225
 226                 if (edge_cnt != edge_cnt_last)
 227                         continue;
 228                 if (!(GPIOB_PDIR & CORE_PIN0_BITMASK))
 229                         break;
 230         }
 231
 232         g.fixed_state[0] = 0x33;
 233         g.fixed_state[1] = 0x3f;
 234         GPIOD_PDOR = 0x33;
 235
 236         t1 = micros();
 237         if (tout == 0) {
 238                 printf("start_seq timeout1, t=%u\n", t1 - start);
 239                 return;
 240         }
 241
 242         for (tout = 100000; tout > 0; tout--) {
 243                 udelay(1);
 244
 245                 if (GPIOB_PDIR & CORE_PIN0_BITMASK)
 246                         break;
 247         }
 248
 249         t2 = micros();
 250         if (tout == 0) {
 251                 printf("start_seq timeout2, t1=%u, t2=%u\n",
 252                         t1 - start, t2 - t1);
 253                 return;
 254         }
 255
 256         //printf(" t1=%u, t2=%u\n", t1 - start, t2 - t1);
 257
 258         if (g.stream_started) {
 259                 printf("got start_seq when already started\n");
 260                 return;
 261         }
 262
 263         if (!g.stream_enable_to && !g.stream_enable_from) {
 264                 printf("got start_seq, without enable from USB\n");
 265                 return;
 266         }
 267
 268         if (g.stream_enable_to && g.t_i == g.t_o) {
 269                 printf("got start_seq while stream_to is empty\n");
 270                 return;
 271         }
 272
 273         if (g.stream_enable_from && g.f_i != g.f_o) {
 274                 printf("got start_seq while stream_from is not empty\n");
 275                 return;
 276         }
 277
 278         __disable_irq();
 279         g.stream_started = 1;
 280         if (g.stream_enable_to) {
 281                 if (g.use_readinc) {
 282                         attachInterruptVector(IRQ_PORTB, portb_isr_do_to_inc);
 283                         attachInterruptVector(IRQ_PORTC, portc_isr_nop);
 284                 }
 285                 else {
 286                         attachInterruptVector(IRQ_PORTB, portb_isr_do_to);
 287                         attachInterruptVector(IRQ_PORTC, portc_isr_frameinc);
 288                 }
 289         }
 290         else if (g.stream_enable_from) {
 291                 g.use_pending = 1;
 292                 if (g.use_readinc) {
 293                         attachInterruptVector(IRQ_PORTB,
 294                                                 portb_isr_fixed_do_from);
 295                         attachInterruptVector(IRQ_PORTC, portc_isr_nop);
 296                 }
 297                 else {
 298                         attachInterruptVector(IRQ_PORTB, portb_isr_fixed);
 299                         attachInterruptVector(IRQ_PORTC,
 300                                               portc_isr_frameinc_do_from);
 301                 }
 302         }
 303         __enable_irq();
 304 }
 305
 306 // callers must disable IRQs
 307 static void clear_state(void)
 308 {
 309         g.stream_enable_to = 0;
 310         g.stream_enable_from = 0;
 311         g.stream_started = 0;
 312         g.stream_ended = 0;
 313         g.use_readinc = 0;
 314         g.use_pending = 0;
 315         g.t_i = g.t_o = 0;
 316         g.f_i = g.f_o = 0;
 317         g.frame_cnt = 0;
 318         attachInterruptVector(IRQ_PORTB, portb_isr_fixed);
 319         attachInterruptVector(IRQ_PORTC, portc_isr_nop);
 320 }
 321
 322 static int get_space_to(void)
 323 {
 324         return STREAM_BUF_SIZE - ((g.t_i - g.t_o) & STREAM_BUF_MASK);
 325 }
 326
 327 static int get_used_from(void)
 328 {
 329         return (g.f_i - g.f_o) & STREAM_BUF_MASK;
 330 }
 331
 332 static void do_usb(void *buf)
 333 {
 334         struct tas_pkt *pkt = buf;
 335         uint32_t t_i, i;
 336         int space;
 337
 338         switch (pkt->type) {
 339         case PKT_FIXED_STATE:
 340                 memcpy(&i, pkt->data, sizeof(i));
 341                 if (g.use_pending)
 342                         g.pending_state32 = i;
 343                 else
 344                         g.fixed_state32 = i;
 345                 break;
 346         case PKT_STREAM_ENABLE:
 347                 __disable_irq();
 348                 clear_state();
 349                 /* wait for start from MD */
 350                 g.stream_enable_to = pkt->enable.stream_to;
 351                 g.stream_enable_from = pkt->enable.stream_from;
 352                 g.use_readinc = pkt->enable.use_readinc;
 353                 __enable_irq();
 354                 break;
 355         case PKT_STREAM_ABORT:
 356                 __disable_irq();
 357                 clear_state();
 358                 __enable_irq();
 359                 break;
 360         case PKT_STREAM_END:
 361                 g.stream_ended = 1;
 362                 printf("end of stream\n");
 363                 break;
 364         case PKT_STREAM_DATA_TO:
 365                 t_i = g.t_i;
 366                 space = get_space_to();
 367                 if (space <= pkt->size / STREAM_EL_SZ) {
 368                         printf("got data pkt while space=%d\n", space);
 369                         return;
 370                 }
 371                 for (i = 0; i < pkt->size / STREAM_EL_SZ; i++) {
 372                         memcpy(&g.stream_to[t_i++],
 373                                pkt->data + i * STREAM_EL_SZ,
 374                                STREAM_EL_SZ);
 375                         t_i &= STREAM_BUF_MASK;
 376                 }
 377                 g.t_i = t_i;
 378                 break;
 379         default:
 380                 printf("got unknown pkt type: %04x\n", pkt->type);
 381                 break;
 382         }
 383 }
 384
 385 int main(void)
 386 {
 387         uint32_t led_time = 0;
 388         uint32_t scheck_time = 0;
 389         uint32_t edge_cnt_last;
 390         uint32_t edge_cnt;
 391         uint8_t buf[64];
 392         int ret;
 393
 394         delay(1000); // wait for usb..
 395
 396         /* ?0SA 00DU, ?1CB RLDU */
 397         g.fixed_state[0] = 0x33;
 398         g.fixed_state[1] = 0x3f;
 399
 400         printf("starting, rawhid: %d\n", usb_rawhid_available());
 401
 402         // md pin   th tr tl  r  l  d  u vsync
 403         // md bit*   6  5  4  3  2  1  0
 404         // t bit   b16 d5 d4 d3 d2 d1 d0    c6
 405         // t pin     0 20  6  8  7 14  2    11
 406         // * - note: tl/tr mixed in most docs
 407         pinMode(0, INPUT);
 408         attachInterrupt(0, portb_isr_fixed, CHANGE);
 409         attachInterruptVector(IRQ_PORTB, portb_isr_fixed);
 410         pinMode(11, INPUT);
 411         attachInterrupt(11, portc_isr_nop, RISING);
 412         attachInterruptVector(IRQ_PORTC, portc_isr_nop);
 413
 414         NVIC_SET_PRIORITY(IRQ_PORTB, 0);
 415         NVIC_SET_PRIORITY(IRQ_PORTC, 16);
 416         SCB_SHPR1 = SCB_SHPR2 = SCB_SHPR3 = 0x10101010;
 417
 418         pinMode( 2, OUTPUT);
 419         pinMode(14, OUTPUT);
 420         pinMode( 7, OUTPUT);
 421         pinMode( 8, OUTPUT);
 422         pinMode( 6, OUTPUT);
 423         pinMode(20, OUTPUT);
 424
 425         // led
 426         pinMode(13, OUTPUT);
 427
 428         // CORE_PIN0_PORTSET CORE_PIN0_BITMASK PORTB_PCR16
 429         printf("GPIOB PDDR, PDIR: %08x %08x\n", GPIOB_PDIR, GPIOB_PDDR);
 430         printf("GPIOC PDDR, PDIR: %08x %08x\n", GPIOC_PDIR, GPIOC_PDDR);
 431         printf("GPIOD PDDR, PDIR: %08x %08x\n", GPIOD_PDIR, GPIOD_PDDR);
 432         printf("PORTB_PCR16: %08x\n", PORTB_PCR16);
 433         printf("PORTC_PCR6:  %08x\n", PORTC_PCR6);
 434         printf("PORTD_PCR0:  %08x\n", PORTD_PCR0);
 435
 436         asm("mrs %0, BASEPRI" : "=r"(ret));
 437         printf("BASEPRI: %d, SHPR: %08x %08x %08x\n",
 438                 ret, SCB_SHPR1, SCB_SHPR2, SCB_SHPR3);
 439
 440         edge_cnt_last = g.edge_cnt;
 441
 442         while (1) {
 443                 struct tas_pkt pkt;
 444                 uint32_t now;
 445
 446                 while (g.stream_enable_to && !g.stream_ended
 447                   && get_space_to() > sizeof(pkt.data) / STREAM_EL_SZ)
 448                 {
 449                         if (g.t_i == g.t_o && g.frame_cnt != 0) {
 450                                 printf("underflow detected\n");
 451                                 g.stream_enable_to = 0;
 452                                 break;
 453                         }
 454
 455                         pkt.type = PKT_STREAM_REQ;
 456                         pkt.req.frame = g.frame_cnt;
 457
 458                         ret = usb_rawhid_send(&pkt, 1000);
 459                         if (ret != sizeof(pkt)) {
 460                                 printf("send STREAM_REQ: %d\n", ret);
 461                                 break;
 462                         }
 463
 464                         ret = usb_rawhid_recv(buf, 1000);
 465                         if (ret != 64)
 466                                 printf("usb_rawhid_recv/s: %d\n", ret);
 467                         else
 468                                 do_usb(buf);
 469                 }
 470
 471                 while (g.stream_enable_from && !g.stream_ended
 472                   && get_used_from() >= sizeof(pkt.data) / STREAM_EL_SZ)
 473                 {
 474                         uint32_t f_o;
 475                         int i;
 476
 477                         f_o = g.f_o;
 478                         for (i = 0; i < sizeof(pkt.data); i += STREAM_EL_SZ) {
 479                                 memcpy(pkt.data + i, &g.stream_from[f_o++],
 480                                         STREAM_EL_SZ);
 481                                 f_o &= STREAM_BUF_MASK;
 482                         }
 483                         g.f_o = f_o;
 484
 485                         pkt.type = PKT_STREAM_DATA_FROM;
 486                         pkt.size = i;
 487
 488                         ret = usb_rawhid_send(&pkt, 1000);
 489                         if (ret != sizeof(pkt)) {
 490                                 printf("send DATA_FROM: %d\n", ret);
 491                                 break;
 492                         }
 493                 }
 494
 495                 now = millis();
 496
 497                 // start condition check
 498                 if (now - scheck_time > 1000) {
 499                         edge_cnt = g.edge_cnt;
 500                         //printf("e: %d th: %d\n", edge_cnt - edge_cnt_last,
 501                         //      (GPIOB_PDIR >> CORE_PIN0_BIT) & 1);
 502                         if ((g.stream_enable_to || g.stream_enable_from)
 503                             && !g.stream_started
 504                             && edge_cnt - edge_cnt_last > 10000)
 505                         {
 506                                 do_start_seq();
 507                                 edge_cnt = g.edge_cnt;
 508                         }
 509                         edge_cnt_last = edge_cnt;
 510                         scheck_time = now;
 511                 }
 512
 513                 // led?
 514                 if (CORE_PIN13_PORTREG & CORE_PIN13_BITMASK) {
 515                         if ((int)(now - led_time) > 10)
 516                                 CORE_PIN13_PORTCLEAR = CORE_PIN13_BITMASK;
 517                 }
 518
 519                 // something on rawhid?
 520                 if (usb_rawhid_available() > 0)
 521                 {
 522                         ret = usb_rawhid_recv(buf, 20);
 523                         if (ret == 64) {
 524                                 led_time = millis();
 525                                 CORE_PIN13_PORTSET = CORE_PIN13_BITMASK;
 526
 527                                 do_usb(buf);
 528                         }
 529                         else {
 530                                 printf("usb_rawhid_recv: %d\n", ret);
 531                         }
 532                 }
 533         }
 534
 535         return 0;
 536 }