2 * TeensyTAS, TAS input player for MegaDrive
3 * Copyright (c) 2014 notaz
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:
13 * The above copyright notice and this permission notice shall be
14 * included in all copies or substantial portions of the Software.
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
29 #include "teensy3/core_pins.h"
30 #include "teensy3/usb_seremu.h"
31 #include "teensy3/usb_rawhid.h"
34 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
36 #define noinline __attribute__((noinline))
39 #define STREAM_BUF_SIZE 512
40 #define STREAM_BUF_MASK (512 - 1)
42 /* ?0SA 00DU, ?1CB RLDU */
43 #define STREAM_EL_SZ 2
46 uint8_t stream_to[2][STREAM_BUF_SIZE][STREAM_EL_SZ];
47 uint8_t stream_from[STREAM_BUF_SIZE][STREAM_EL_SZ];
50 uint8_t fixed_state[4];
51 uint32_t fixed_state32;
54 uint8_t pending_state[4];
55 uint32_t pending_state32;
58 uint32_t stream_enable_to:1;
59 uint32_t stream_enable_from:1;
60 uint32_t stream_started:1;
61 uint32_t stream_ended:1;
63 uint32_t use_pending:1;
69 } pos_to_p[2], pos_from;
72 ssize_t _write(int fd, const void *buf, size_t nbyte)
77 if (fd != 1 && fd != 2) {
78 snprintf(tbuf, sizeof(tbuf), "write to fd %d\n", fd);
79 usb_seremu_write(tbuf, strlen(tbuf));
82 ret = usb_seremu_write(buf, nbyte);
83 return ret < 0 ? ret : nbyte;
90 static noinline void choose_isrs_idle(void);
93 #define PL1_ISFR PORTD_ISFR
94 #define PL1_TH() ((CORE_PIN21_PINREG >> CORE_PIN21_BIT) & 1)
96 static void pl1th_isr_fixed(void)
104 GPIOD_PDOR = g.pl[0].fixed_state[th];
108 static noinline void do_to_step(void)
112 g.pos_to_p[0].o = (g.pos_to_p[0].o + 1) & STREAM_BUF_MASK;
113 if (g.pos_to_p[0].o == g.pos_to_p[0].i)
118 static void pl1th_isr_do_to_inc(void)
126 GPIOD_PDOR = g.stream_to[0][g.pos_to_p[0].o][th];
131 static void pl1th_isr_do_to(void)
139 GPIOD_PDOR = g.stream_to[0][g.pos_to_p[0].o][th];
144 #define PL2_ISFR PORTC_ISFR
145 #define PL2_TH() ((CORE_PIN15_PINREG >> CORE_PIN15_BIT) & 1)
146 #define PL2_ADJ(x) ((x) | ((x) << 12))
148 static void pl2th_isr_fixed(void)
150 uint32_t isfr, th, v;
156 v = g.pl[1].fixed_state[th];
157 GPIOB_PDOR = PL2_ADJ(v);
160 static void pl2th_isr_do_to(void)
162 uint32_t isfr, th, v;
168 v = g.stream_to[1][g.pos_to_p[0].o][th];
169 GPIOB_PDOR = PL2_ADJ(v);
171 g.pos_to_p[1].o = g.pos_to_p[0].o;
174 static void pl2th_isr_do_to_inc_pl1(void)
176 uint32_t isfr, th, v;
182 v = g.stream_to[1][g.pos_to_p[1].o][th];
183 GPIOB_PDOR = PL2_ADJ(v);
186 g.pos_to_p[1].o = g.pos_to_p[0].o;
191 #define VSYNC_ISFR PORTC_ISFR
193 static void vsync_isr_nop(void)
201 // /vsync starts at line 235/259 (ntsc/pal), just as vcounter jumps back
202 // we care when it comes out (/vsync goes high) after 3 lines at 238/262
203 static void vsync_isr_frameinc(void)
210 g.pos_to_p[0].o = (g.pos_to_p[0].o + 1) & STREAM_BUF_MASK;
211 g.pos_to_p[1].o = g.pos_to_p[0].o;
213 if (g.pos_to_p[0].o == g.pos_to_p[0].i)
218 /* "recording" data */
219 static noinline void do_from_step(void)
223 // should hopefully give atomic fixed_state read..
224 s = g.pl[0].fixed_state32;
225 g.pl[0].fixed_state32 = g.pl[0].pending_state32;
226 g.stream_from[g.pos_from.i][0] = s;
227 g.stream_from[g.pos_from.i][1] = s >> 8;
228 g.pos_from.i = (g.pos_from.i + 1) & STREAM_BUF_MASK;
231 static void pl1th_isr_fixed_do_from(void)
239 GPIOD_PDOR = g.pl[0].fixed_state[th];
245 static void vsync_isr_frameinc_do_from(void)
257 static void choose_isrs(void)
259 void (*pl1th_handler)(void) = pl1th_isr_fixed;
260 void (*pl2th_handler)(void) = pl2th_isr_fixed;
261 void (*vsync_handler)(void) = vsync_isr_nop;
263 if (g.stream_enable_to) {
264 switch (g.inc_mode) {
266 pl1th_handler = pl1th_isr_do_to;
267 pl2th_handler = pl2th_isr_do_to;
268 vsync_handler = vsync_isr_frameinc;
270 case INC_MODE_SHARED_PL1:
271 pl1th_handler = pl1th_isr_do_to_inc;
272 pl2th_handler = pl2th_isr_do_to;
274 case INC_MODE_SHARED_PL2:
275 pl1th_handler = pl1th_isr_do_to;
276 pl2th_handler = pl2th_isr_do_to_inc_pl1;
280 else if (g.stream_enable_from) {
282 switch (g.inc_mode) {
284 vsync_handler = vsync_isr_frameinc_do_from;
286 case INC_MODE_SHARED_PL1:
287 pl1th_handler = pl1th_isr_fixed_do_from;
289 case INC_MODE_SHARED_PL2:
295 attachInterruptVector(IRQ_PORTD, pl1th_handler);
296 attachInterruptVector(IRQ_PORTC, pl2th_handler);
297 attachInterruptVector(IRQ_PORTA, vsync_handler);
300 static noinline void choose_isrs_idle(void)
302 attachInterruptVector(IRQ_PORTD, pl1th_isr_fixed);
303 attachInterruptVector(IRQ_PORTC, pl2th_isr_fixed);
304 attachInterruptVector(IRQ_PORTA, vsync_isr_nop);
307 static void udelay(uint32_t us)
309 uint32_t start = micros();
311 while ((micros() - start) < us) {
312 asm volatile("nop; nop; nop; nop");
317 static void do_start_seq(void)
319 uint32_t edge_cnt_last;
321 uint32_t start, t1, t2;
325 edge_cnt = g.edge_cnt;
328 g.pl[0].fixed_state[0] =
329 g.pl[0].fixed_state[1] = 0x25;
331 for (tout = 10000; tout > 0; tout--) {
332 edge_cnt_last = edge_cnt;
334 edge_cnt = g.edge_cnt;
336 if (edge_cnt != edge_cnt_last)
342 g.pl[0].fixed_state[0] = 0x33;
343 g.pl[0].fixed_state[1] = 0x3f;
348 printf("start_seq timeout1, t=%u\n", t1 - start);
352 for (tout = 100000; tout > 0; tout--) {
361 printf("start_seq timeout2, t1=%u, t2=%u\n",
362 t1 - start, t2 - t1);
366 //printf(" t1=%u, t2=%u\n", t1 - start, t2 - t1);
368 if (g.stream_started) {
369 printf("got start_seq when already started\n");
373 if (!g.stream_enable_to && !g.stream_enable_from) {
374 printf("got start_seq, without enable from USB\n");
378 if (g.stream_enable_to && g.pos_to_p[0].i == g.pos_to_p[0].o) {
379 printf("got start_seq while stream_to is empty\n");
383 if (g.stream_enable_from && g.pos_from.i != g.pos_from.o) {
384 printf("got start_seq while stream_from is not empty\n");
390 g.stream_started = 1;
394 // callers must disable IRQs
395 static void clear_state(void)
399 g.stream_enable_to = 0;
400 g.stream_enable_from = 0;
401 g.stream_started = 0;
403 g.inc_mode = INC_MODE_VSYNC;
405 for (i = 0; i < ARRAY_SIZE(g.pos_to_p); i++)
406 g.pos_to_p[i].i = g.pos_to_p[i].o = 0;
407 g.pos_from.i = g.pos_from.o = 0;
412 static int get_space_to(int p)
414 return STREAM_BUF_SIZE - ((g.pos_to_p[p].i - g.pos_to_p[p].o)
418 static int get_used_from(void)
420 return (g.pos_from.i - g.pos_from.o) & STREAM_BUF_MASK;
423 static void do_usb(void *buf)
425 struct tas_pkt *pkt = buf;
426 uint32_t pos_to_i, i, p;
430 case PKT_FIXED_STATE:
431 memcpy(&i, pkt->data, sizeof(i));
433 g.pl[0].pending_state32 = i;
435 g.pl[0].fixed_state32 = i;
437 case PKT_STREAM_ENABLE:
440 /* wait for start from MD */
441 g.stream_enable_to = pkt->enable.stream_to;
442 g.stream_enable_from = pkt->enable.stream_from;
443 g.inc_mode = pkt->enable.inc_mode;
444 if (pkt->enable.no_start_seq) {
447 g.stream_started = 1;
451 case PKT_STREAM_ABORT:
458 printf("end of stream\n");
460 case PKT_STREAM_DATA_TO_P1:
461 case PKT_STREAM_DATA_TO_P2:
462 p = pkt->type == PKT_STREAM_DATA_TO_P1 ? 0 : 1;
463 pos_to_i = g.pos_to_p[p].i;
464 space = get_space_to(p);
465 if (space <= pkt->size / STREAM_EL_SZ) {
466 printf("got data pkt while space=%d\n", space);
469 for (i = 0; i < pkt->size / STREAM_EL_SZ; i++) {
470 memcpy(&g.stream_to[p][pos_to_i++],
471 pkt->data + i * STREAM_EL_SZ,
473 pos_to_i &= STREAM_BUF_MASK;
475 g.pos_to_p[p].i = pos_to_i;
478 printf("got unknown pkt type: %04x\n", pkt->type);
483 static void check_get_data(int p)
489 if (get_space_to(p) <= sizeof(pkt.data) / STREAM_EL_SZ)
492 if (g.pos_to_p[p].i == g.pos_to_p[p].o && g.frame_cnt != 0) {
493 printf("underflow detected\n");
494 g.stream_enable_to = 0;
498 pkt.type = PKT_STREAM_REQ;
499 pkt.req.frame = g.frame_cnt;
502 ret = usb_rawhid_send(&pkt, 1000);
503 if (ret != sizeof(pkt)) {
504 printf("send STREAM_REQ/%d: %d\n", p, ret);
508 ret = usb_rawhid_recv(buf, 1000);
510 printf("usb_rawhid_recv/s: %d\n", ret);
517 uint32_t led_time = 0;
518 uint32_t scheck_time = 0;
519 uint32_t edge_cnt_last;
524 delay(1000); // wait for usb..
526 /* ?0SA 00DU, ?1CB RLDU */
527 for (i = 0; i < 2; i++) {
528 g.pl[i].fixed_state[0] = 0x33;
529 g.pl[i].fixed_state[1] = 0x3f;
532 printf("starting, rawhid: %d\n", usb_rawhid_available());
536 // md pin th tr tl r l d u vsync th tr tl r l d u
537 // 7 9 6 4 3 2 1 7 9 6 4 3 2 1
538 // md bit* 6 5 4 3 2 1 0 6 5 4 3 2 1 0
539 // t bit d6 d5 d4 d3 d2 d1 d0 a12 c0 b17 b16 b3 b2 b1 b0
540 // t pin 21 20 6 8 7 14 2 3 15 1 0 18 19 17 16
541 // * - note: tl/tr mixed in most docs
545 attachInterrupt(21, pl1th_isr_fixed, CHANGE);
546 NVIC_SET_PRIORITY(IRQ_PORTD, 0);
557 attachInterrupt(15, pl1th_isr_fixed, CHANGE);
558 NVIC_SET_PRIORITY(IRQ_PORTC, 0);
569 attachInterrupt(3, vsync_isr_nop, RISING);
570 NVIC_SET_PRIORITY(IRQ_PORTA, 16);
575 // lower other priorities
576 SCB_SHPR1 = SCB_SHPR2 = SCB_SHPR3 = 0x10101010;
578 // CORE_PIN0_PORTSET CORE_PIN0_BITMASK PORTB_PCR16
579 printf("GPIOB PDDR, PDIR: %08x %08x\n", GPIOB_PDIR, GPIOB_PDDR);
580 printf("GPIOC PDDR, PDIR: %08x %08x\n", GPIOC_PDIR, GPIOC_PDDR);
581 printf("GPIOD PDDR, PDIR: %08x %08x\n", GPIOD_PDIR, GPIOD_PDDR);
582 printf("PORTB_PCR16: %08x\n", PORTB_PCR16);
583 printf("PORTC_PCR6: %08x\n", PORTC_PCR6);
584 printf("PORTD_PCR0: %08x\n", PORTD_PCR0);
586 asm("mrs %0, BASEPRI" : "=r"(ret));
587 printf("BASEPRI: %d, SHPR: %08x %08x %08x\n",
588 ret, SCB_SHPR1, SCB_SHPR2, SCB_SHPR3);
590 edge_cnt_last = g.edge_cnt;
596 if (g.stream_enable_to && !g.stream_ended) {
598 if (g.inc_mode == INC_MODE_SHARED_PL2)
602 while (g.stream_enable_from && !g.stream_ended
603 && get_used_from() >= sizeof(pkt.data) / STREAM_EL_SZ)
609 for (i = 0; i < sizeof(pkt.data); i += STREAM_EL_SZ) {
610 memcpy(pkt.data + i, &g.stream_from[o++],
612 o &= STREAM_BUF_MASK;
616 pkt.type = PKT_STREAM_DATA_FROM;
619 ret = usb_rawhid_send(&pkt, 1000);
620 if (ret != sizeof(pkt)) {
621 printf("send DATA_FROM: %d\n", ret);
628 // start condition check
629 if (now - scheck_time > 1000) {
630 edge_cnt = g.edge_cnt;
631 //printf("e: %d th: %d\n", edge_cnt - edge_cnt_last,
633 if ((g.stream_enable_to || g.stream_enable_from)
635 && edge_cnt - edge_cnt_last > 10000)
638 edge_cnt = g.edge_cnt;
640 edge_cnt_last = edge_cnt;
645 if (CORE_PIN13_PORTREG & CORE_PIN13_BITMASK) {
646 if ((int)(now - led_time) > 10)
647 CORE_PIN13_PORTCLEAR = CORE_PIN13_BITMASK;
650 // something on rawhid?
651 if (usb_rawhid_available() > 0)
653 ret = usb_rawhid_recv(buf, 20);
656 CORE_PIN13_PORTSET = CORE_PIN13_BITMASK;
661 printf("usb_rawhid_recv: %d\n", ret);