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 noinline __attribute__((noinline))
37 #define STREAM_BUF_SIZE 512
38 #define STREAM_BUF_MASK (512 - 1)
40 /* ?0SA 00DU, ?1CB RLDU */
41 #define STREAM_EL_SZ 2
44 uint8_t stream_to[STREAM_BUF_SIZE][STREAM_EL_SZ];
45 uint8_t stream_from[STREAM_BUF_SIZE][STREAM_EL_SZ];
47 uint8_t fixed_state[4];
48 uint32_t fixed_state32;
51 uint8_t pending_state[4];
52 uint32_t pending_state32;
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;
68 ssize_t _write(int fd, const void *buf, size_t nbyte)
73 if (fd != 1 && fd != 2) {
74 snprintf(tbuf, sizeof(tbuf), "write to fd %d\n", fd);
75 usb_seremu_write(tbuf, strlen(tbuf));
78 ret = usb_seremu_write(buf, nbyte);
79 return ret < 0 ? ret : nbyte;
86 /* portb handles TH */
87 static void portb_isr_fixed(void)
93 th = (GPIOB_PDIR >> CORE_PIN0_BIT) & 1;
95 GPIOD_PDOR = g.fixed_state[th];
99 static noinline void do_to_step(void)
103 g.t_o = (g.t_o + 1) & STREAM_BUF_MASK;
106 attachInterruptVector(IRQ_PORTB, portb_isr_fixed);
109 static void portb_isr_do_to_inc(void)
115 th = (GPIOB_PDIR >> CORE_PIN0_BIT) & 1;
117 GPIOD_PDOR = g.stream_to[g.t_o][th];
122 static void portb_isr_do_to(void)
128 th = (GPIOB_PDIR >> CORE_PIN0_BIT) & 1;
130 GPIOD_PDOR = g.stream_to[g.t_o][th];
134 static void portc_isr_nop(void)
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)
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);
159 /* "recording" data */
160 static noinline void do_from_step(void)
164 // should hopefully give atomic fixed_state read..
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;
172 static void portb_isr_fixed_do_from(void)
178 th = (GPIOB_PDIR >> CORE_PIN0_BIT) & 1;
180 GPIOD_PDOR = g.fixed_state[th];
186 static void portc_isr_frameinc_do_from(void)
197 static void udelay(uint32_t us)
199 uint32_t start = micros();
201 while ((micros() - start) < us) {
202 asm volatile("nop; nop; nop; nop");
207 static void do_start_seq(void)
209 uint32_t edge_cnt_last;
211 uint32_t start, t1, t2;
215 edge_cnt = g.edge_cnt;
219 g.fixed_state[1] = 0x25;
221 for (tout = 10000; tout > 0; tout--) {
222 edge_cnt_last = edge_cnt;
224 edge_cnt = g.edge_cnt;
226 if (edge_cnt != edge_cnt_last)
228 if (!(GPIOB_PDIR & CORE_PIN0_BITMASK))
232 g.fixed_state[0] = 0x33;
233 g.fixed_state[1] = 0x3f;
238 printf("start_seq timeout1, t=%u\n", t1 - start);
242 for (tout = 100000; tout > 0; tout--) {
245 if (GPIOB_PDIR & CORE_PIN0_BITMASK)
251 printf("start_seq timeout2, t1=%u, t2=%u\n",
252 t1 - start, t2 - t1);
256 //printf(" t1=%u, t2=%u\n", t1 - start, t2 - t1);
258 if (g.stream_started) {
259 printf("got start_seq when already started\n");
263 if (!g.stream_enable_to && !g.stream_enable_from) {
264 printf("got start_seq, without enable from USB\n");
268 if (g.stream_enable_to && g.t_i == g.t_o) {
269 printf("got start_seq while stream_to is empty\n");
273 if (g.stream_enable_from && g.f_i != g.f_o) {
274 printf("got start_seq while stream_from is not empty\n");
279 g.stream_started = 1;
280 if (g.stream_enable_to) {
282 attachInterruptVector(IRQ_PORTB, portb_isr_do_to_inc);
283 attachInterruptVector(IRQ_PORTC, portc_isr_nop);
286 attachInterruptVector(IRQ_PORTB, portb_isr_do_to);
287 attachInterruptVector(IRQ_PORTC, portc_isr_frameinc);
290 else if (g.stream_enable_from) {
293 attachInterruptVector(IRQ_PORTB,
294 portb_isr_fixed_do_from);
295 attachInterruptVector(IRQ_PORTC, portc_isr_nop);
298 attachInterruptVector(IRQ_PORTB, portb_isr_fixed);
299 attachInterruptVector(IRQ_PORTC,
300 portc_isr_frameinc_do_from);
306 // callers must disable IRQs
307 static void clear_state(void)
309 g.stream_enable_to = 0;
310 g.stream_enable_from = 0;
311 g.stream_started = 0;
318 attachInterruptVector(IRQ_PORTB, portb_isr_fixed);
319 attachInterruptVector(IRQ_PORTC, portc_isr_nop);
322 static int get_space_to(void)
324 return STREAM_BUF_SIZE - ((g.t_i - g.t_o) & STREAM_BUF_MASK);
327 static int get_used_from(void)
329 return (g.f_i - g.f_o) & STREAM_BUF_MASK;
332 static void do_usb(void *buf)
334 struct tas_pkt *pkt = buf;
339 case PKT_FIXED_STATE:
340 memcpy(&i, pkt->data, sizeof(i));
342 g.pending_state32 = i;
346 case PKT_STREAM_ENABLE:
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;
355 case PKT_STREAM_ABORT:
362 printf("end of stream\n");
364 case PKT_STREAM_DATA_TO:
366 space = get_space_to();
367 if (space <= pkt->size / STREAM_EL_SZ) {
368 printf("got data pkt while space=%d\n", space);
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,
375 t_i &= STREAM_BUF_MASK;
380 printf("got unknown pkt type: %04x\n", pkt->type);
387 uint32_t led_time = 0;
388 uint32_t scheck_time = 0;
389 uint32_t edge_cnt_last;
394 delay(1000); // wait for usb..
396 /* ?0SA 00DU, ?1CB RLDU */
397 g.fixed_state[0] = 0x33;
398 g.fixed_state[1] = 0x3f;
400 printf("starting, rawhid: %d\n", usb_rawhid_available());
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
408 attachInterrupt(0, portb_isr_fixed, CHANGE);
409 attachInterruptVector(IRQ_PORTB, portb_isr_fixed);
411 attachInterrupt(11, portc_isr_nop, RISING);
412 attachInterruptVector(IRQ_PORTC, portc_isr_nop);
414 NVIC_SET_PRIORITY(IRQ_PORTB, 0);
415 NVIC_SET_PRIORITY(IRQ_PORTC, 16);
416 SCB_SHPR1 = SCB_SHPR2 = SCB_SHPR3 = 0x10101010;
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);
436 asm("mrs %0, BASEPRI" : "=r"(ret));
437 printf("BASEPRI: %d, SHPR: %08x %08x %08x\n",
438 ret, SCB_SHPR1, SCB_SHPR2, SCB_SHPR3);
440 edge_cnt_last = g.edge_cnt;
446 while (g.stream_enable_to && !g.stream_ended
447 && get_space_to() > sizeof(pkt.data) / STREAM_EL_SZ)
449 if (g.t_i == g.t_o && g.frame_cnt != 0) {
450 printf("underflow detected\n");
451 g.stream_enable_to = 0;
455 pkt.type = PKT_STREAM_REQ;
456 pkt.req.frame = g.frame_cnt;
458 ret = usb_rawhid_send(&pkt, 1000);
459 if (ret != sizeof(pkt)) {
460 printf("send STREAM_REQ: %d\n", ret);
464 ret = usb_rawhid_recv(buf, 1000);
466 printf("usb_rawhid_recv/s: %d\n", ret);
471 while (g.stream_enable_from && !g.stream_ended
472 && get_used_from() >= sizeof(pkt.data) / STREAM_EL_SZ)
478 for (i = 0; i < sizeof(pkt.data); i += STREAM_EL_SZ) {
479 memcpy(pkt.data + i, &g.stream_from[f_o++],
481 f_o &= STREAM_BUF_MASK;
485 pkt.type = PKT_STREAM_DATA_FROM;
488 ret = usb_rawhid_send(&pkt, 1000);
489 if (ret != sizeof(pkt)) {
490 printf("send DATA_FROM: %d\n", ret);
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)
504 && edge_cnt - edge_cnt_last > 10000)
507 edge_cnt = g.edge_cnt;
509 edge_cnt_last = edge_cnt;
514 if (CORE_PIN13_PORTREG & CORE_PIN13_BITMASK) {
515 if ((int)(now - led_time) > 10)
516 CORE_PIN13_PORTCLEAR = CORE_PIN13_BITMASK;
519 // something on rawhid?
520 if (usb_rawhid_available() > 0)
522 ret = usb_rawhid_recv(buf, 20);
525 CORE_PIN13_PORTSET = CORE_PIN13_BITMASK;
530 printf("usb_rawhid_recv: %d\n", ret);