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 void portb_isr_do_to_inc(void)
105 th = (GPIOB_PDIR >> CORE_PIN0_BIT) & 1;
107 GPIOD_PDOR = g.stream_to[g.t_o][th];
109 g.t_o = (g.t_o + 1) & STREAM_BUF_MASK;
112 attachInterruptVector(IRQ_PORTB, portb_isr_fixed);
118 static void portb_isr_do_to(void)
124 th = (GPIOB_PDIR >> CORE_PIN0_BIT) & 1;
126 GPIOD_PDOR = g.stream_to[g.t_o][th];
130 static void portc_isr_nop(void)
138 // /vsync starts at line 235/259 (ntsc/pal), just as vcounter jumps back
139 // we care when it comes out (/vsync goes high) after 3 lines at 238/262
140 static void portc_isr_frameinc(void)
147 g.t_o = (g.t_o + 1) & STREAM_BUF_MASK;
148 if (g.t_o == g.t_i) {
149 attachInterruptVector(IRQ_PORTB, portb_isr_fixed);
150 attachInterruptVector(IRQ_PORTC, portc_isr_nop);
155 /* "recording" data */
156 static noinline void do_from_step(void)
160 // should hopefully give atomic fixed_state read..
162 g.fixed_state32 = g.pending_state32;
163 g.stream_from[g.f_i][0] = s;
164 g.stream_from[g.f_i][1] = s >> 8;
165 g.f_i = (g.f_i + 1) & STREAM_BUF_MASK;
168 static void portb_isr_fixed_do_from(void)
174 th = (GPIOB_PDIR >> CORE_PIN0_BIT) & 1;
176 GPIOD_PDOR = g.fixed_state[th];
182 static void portc_isr_frameinc_do_from(void)
193 static void udelay(uint32_t us)
195 uint32_t start = micros();
197 while ((micros() - start) < us) {
198 asm volatile("nop; nop; nop; nop");
203 static void do_start_seq(void)
205 uint32_t edge_cnt_last;
207 uint32_t start, t1, t2;
211 edge_cnt = g.edge_cnt;
215 g.fixed_state[1] = 0x25;
217 for (tout = 10000; tout > 0; tout--) {
218 edge_cnt_last = edge_cnt;
220 edge_cnt = g.edge_cnt;
222 if (edge_cnt != edge_cnt_last)
224 if (!(GPIOB_PDIR & CORE_PIN0_BITMASK))
228 g.fixed_state[0] = 0x33;
229 g.fixed_state[1] = 0x3f;
234 printf("start_seq timeout1, t=%u\n", t1 - start);
238 for (tout = 100000; tout > 0; tout--) {
241 if (GPIOB_PDIR & CORE_PIN0_BITMASK)
247 printf("start_seq timeout2, t1=%u, t2=%u\n",
248 t1 - start, t2 - t1);
252 //printf(" t1=%u, t2=%u\n", t1 - start, t2 - t1);
254 if (g.stream_started) {
255 printf("got start_seq when already started\n");
259 if (!g.stream_enable_to && !g.stream_enable_from) {
260 printf("got start_seq, without enable from USB\n");
264 if (g.stream_enable_to && g.t_i == g.t_o) {
265 printf("got start_seq while stream_to is empty\n");
269 if (g.stream_enable_from && g.f_i != g.f_o) {
270 printf("got start_seq while stream_from is not empty\n");
275 g.stream_started = 1;
276 if (g.stream_enable_to) {
278 attachInterruptVector(IRQ_PORTB, portb_isr_do_to_inc);
279 attachInterruptVector(IRQ_PORTC, portc_isr_nop);
282 attachInterruptVector(IRQ_PORTB, portb_isr_do_to);
283 attachInterruptVector(IRQ_PORTC, portc_isr_frameinc);
286 else if (g.stream_enable_from) {
289 attachInterruptVector(IRQ_PORTB,
290 portb_isr_fixed_do_from);
291 attachInterruptVector(IRQ_PORTC, portc_isr_nop);
294 attachInterruptVector(IRQ_PORTB, portb_isr_fixed);
295 attachInterruptVector(IRQ_PORTC,
296 portc_isr_frameinc_do_from);
302 // callers must disable IRQs
303 static void clear_state(void)
305 g.stream_enable_to = 0;
306 g.stream_enable_from = 0;
307 g.stream_started = 0;
314 attachInterruptVector(IRQ_PORTB, portb_isr_fixed);
315 attachInterruptVector(IRQ_PORTC, portc_isr_nop);
318 static int get_space_to(void)
320 return STREAM_BUF_SIZE - ((g.t_i - g.t_o) & STREAM_BUF_MASK);
323 static int get_used_from(void)
325 return (g.f_i - g.f_o) & STREAM_BUF_MASK;
328 static void do_usb(void *buf)
330 struct tas_pkt *pkt = buf;
335 case PKT_FIXED_STATE:
336 memcpy(&i, pkt->data, sizeof(i));
338 g.pending_state32 = i;
342 case PKT_STREAM_ENABLE:
345 /* wait for start from MD */
346 g.stream_enable_to = pkt->enable.stream_to;
347 g.stream_enable_from = pkt->enable.stream_from;
348 g.use_readinc = pkt->enable.use_readinc;
351 case PKT_STREAM_ABORT:
358 printf("end of stream\n");
360 case PKT_STREAM_DATA_TO:
362 space = get_space_to();
363 if (space <= pkt->size / STREAM_EL_SZ) {
364 printf("got data pkt while space=%d\n", space);
367 for (i = 0; i < pkt->size / STREAM_EL_SZ; i++) {
368 memcpy(&g.stream_to[t_i++],
369 pkt->data + i * STREAM_EL_SZ,
371 t_i &= STREAM_BUF_MASK;
376 printf("got unknown pkt type: %04x\n", pkt->type);
383 uint32_t led_time = 0;
384 uint32_t scheck_time = 0;
385 uint32_t edge_cnt_last;
390 delay(1000); // wait for usb..
392 /* ?0SA 00DU, ?1CB RLDU */
393 g.fixed_state[0] = 0x33;
394 g.fixed_state[1] = 0x3f;
396 printf("starting, rawhid: %d\n", usb_rawhid_available());
398 // md pin th tr tl r l d u vsync
399 // md bit* 6 5 4 3 2 1 0
400 // t bit b16 d5 d4 d3 d2 d1 d0 c6
401 // t pin 0 20 6 8 7 14 2 11
402 // * - note: tl/tr mixed in most docs
404 attachInterrupt(0, portb_isr_fixed, CHANGE);
405 attachInterruptVector(IRQ_PORTB, portb_isr_fixed);
407 attachInterrupt(11, portc_isr_nop, RISING);
408 attachInterruptVector(IRQ_PORTC, portc_isr_nop);
410 NVIC_SET_PRIORITY(IRQ_PORTB, 0);
411 NVIC_SET_PRIORITY(IRQ_PORTC, 16);
423 // CORE_PIN0_PORTSET CORE_PIN0_BITMASK PORTB_PCR16
424 printf("GPIOB PDDR, PDIR: %08x %08x\n", GPIOB_PDIR, GPIOB_PDDR);
425 printf("GPIOC PDDR, PDIR: %08x %08x\n", GPIOC_PDIR, GPIOC_PDDR);
426 printf("GPIOD PDDR, PDIR: %08x %08x\n", GPIOD_PDIR, GPIOD_PDDR);
427 printf("PORTB_PCR16: %08x\n", PORTB_PCR16);
428 printf("PORTC_PCR6: %08x\n", PORTC_PCR6);
430 asm("mrs %0, BASEPRI" : "=r"(ret));
431 printf("BASEPRI: %d\n", ret);
433 edge_cnt_last = g.edge_cnt;
439 while (g.stream_enable_to && !g.stream_ended
440 && get_space_to() > sizeof(pkt.data) / STREAM_EL_SZ)
442 if (g.t_i == g.t_o && g.frame_cnt != 0) {
443 printf("underflow detected\n");
444 g.stream_enable_to = 0;
448 pkt.type = PKT_STREAM_REQ;
449 pkt.req.frame = g.frame_cnt;
451 ret = usb_rawhid_send(&pkt, 1000);
452 if (ret != sizeof(pkt)) {
453 printf("send STREAM_REQ: %d\n", ret);
457 ret = usb_rawhid_recv(buf, 1000);
459 printf("usb_rawhid_recv/s: %d\n", ret);
464 while (g.stream_enable_from && !g.stream_ended
465 && get_used_from() >= sizeof(pkt.data) / STREAM_EL_SZ)
471 for (i = 0; i < sizeof(pkt.data); i += STREAM_EL_SZ) {
472 memcpy(pkt.data + i, &g.stream_from[f_o++],
474 f_o &= STREAM_BUF_MASK;
478 pkt.type = PKT_STREAM_DATA_FROM;
481 ret = usb_rawhid_send(&pkt, 1000);
482 if (ret != sizeof(pkt)) {
483 printf("send DATA_FROM: %d\n", ret);
490 // start condition check
491 if (now - scheck_time > 1000) {
492 edge_cnt = g.edge_cnt;
493 //printf("e: %d th: %d\n", edge_cnt - edge_cnt_last,
494 // (GPIOB_PDIR >> CORE_PIN0_BIT) & 1);
495 if ((g.stream_enable_to || g.stream_enable_from)
497 && edge_cnt - edge_cnt_last > 10000)
500 edge_cnt = g.edge_cnt;
502 edge_cnt_last = edge_cnt;
507 if (CORE_PIN13_PORTREG & CORE_PIN13_BITMASK) {
508 if ((int)(now - led_time) > 10)
509 CORE_PIN13_PORTCLEAR = CORE_PIN13_BITMASK;
512 // something on rawhid?
513 if (usb_rawhid_available() > 0)
515 ret = usb_rawhid_recv(buf, 20);
518 CORE_PIN13_PORTSET = CORE_PIN13_BITMASK;
523 printf("usb_rawhid_recv: %d\n", ret);