+/*
+ * TeensyTAS, TAS input player for MegaDrive
+ * Copyright (c) 2014 notaz
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "teensy3/core_pins.h"
#include "teensy3/usb_seremu.h"
#include "teensy3/usb_rawhid.h"
+#include "pkts.h"
+
+#define noinline __attribute__((noinline))
+
+// use power of 2
+#define STREAM_BUF_SIZE 512
+#define STREAM_BUF_MASK (512 - 1)
/* ?0SA 00DU, ?1CB RLDU */
-static uint8_t fixed_state[4] = { 0x33, 0x3f };
+#define STREAM_EL_SZ 2
+
+static struct {
+ uint8_t stream_to[STREAM_BUF_SIZE][STREAM_EL_SZ];
+ uint8_t stream_from[STREAM_BUF_SIZE][STREAM_EL_SZ];
+ union {
+ uint8_t fixed_state[4];
+ uint32_t fixed_state32;
+ };
+ union {
+ uint8_t pending_state[4];
+ uint32_t pending_state32;
+ };
+ uint32_t stream_enable_to:1;
+ uint32_t stream_enable_from:1;
+ uint32_t stream_started:1;
+ uint32_t stream_ended:1;
+ uint32_t use_readinc:1;
+ uint32_t use_pending:1;
+ uint32_t frame_cnt;
+ uint32_t edge_cnt;
+ uint32_t t_i;
+ uint32_t t_o;
+ uint32_t f_i;
+ uint32_t f_o;
+} g;
ssize_t _write(int fd, const void *buf, size_t nbyte)
{
{
}
-static void pin0_irq(void)
+/* portb handles TH */
+static void portb_isr_fixed(void)
+{
+ uint32_t isfr, th;
+
+ isfr = PORTB_ISFR;
+ PORTB_ISFR = isfr;
+ th = (GPIOB_PDIR >> CORE_PIN0_BIT) & 1;
+
+ GPIOD_PDOR = g.fixed_state[th];
+ g.edge_cnt++;
+}
+
+static noinline void do_to_step(void)
+{
+ g.frame_cnt++;
+
+ g.t_o = (g.t_o + 1) & STREAM_BUF_MASK;
+ if (g.t_o == g.t_i)
+ // done
+ attachInterruptVector(IRQ_PORTB, portb_isr_fixed);
+}
+
+static void portb_isr_do_to_inc(void)
+{
+ uint32_t isfr, th;
+
+ isfr = PORTB_ISFR;
+ PORTB_ISFR = isfr;
+ th = (GPIOB_PDIR >> CORE_PIN0_BIT) & 1;
+
+ GPIOD_PDOR = g.stream_to[g.t_o][th];
+ if (th)
+ do_to_step();
+}
+
+static void portb_isr_do_to(void)
{
+ uint32_t isfr, th;
+
+ isfr = PORTB_ISFR;
+ PORTB_ISFR = isfr;
+ th = (GPIOB_PDIR >> CORE_PIN0_BIT) & 1;
+
+ GPIOD_PDOR = g.stream_to[g.t_o][th];
+ g.edge_cnt++;
}
-void portb_isr(void)
+static void portc_isr_nop(void)
{
uint32_t isfr;
- //printf("irq, GPIOB_PDIR: %08x\n", GPIOB_PDIR);
+ isfr = PORTC_ISFR;
+ PORTC_ISFR = isfr;
+}
- GPIOD_PDOR = fixed_state[(GPIOB_PDIR >> CORE_PIN0_BIT) & 1];
+// /vsync starts at line 235/259 (ntsc/pal), just as vcounter jumps back
+// we care when it comes out (/vsync goes high) after 3 lines at 238/262
+static void portc_isr_frameinc(void)
+{
+ uint32_t isfr;
+
+ isfr = PORTC_ISFR;
+ PORTC_ISFR = isfr;
+
+ g.t_o = (g.t_o + 1) & STREAM_BUF_MASK;
+ if (g.t_o == g.t_i) {
+ attachInterruptVector(IRQ_PORTB, portb_isr_fixed);
+ attachInterruptVector(IRQ_PORTC, portc_isr_nop);
+ }
+ g.frame_cnt++;
+}
+
+/* "recording" data */
+static noinline void do_from_step(void)
+{
+ uint32_t s;
+
+ // should hopefully give atomic fixed_state read..
+ s = g.fixed_state32;
+ g.fixed_state32 = g.pending_state32;
+ g.stream_from[g.f_i][0] = s;
+ g.stream_from[g.f_i][1] = s >> 8;
+ g.f_i = (g.f_i + 1) & STREAM_BUF_MASK;
+}
+
+static void portb_isr_fixed_do_from(void)
+{
+ uint32_t isfr, th;
isfr = PORTB_ISFR;
PORTB_ISFR = isfr;
+ th = (GPIOB_PDIR >> CORE_PIN0_BIT) & 1;
+
+ GPIOD_PDOR = g.fixed_state[th];
+ if (th)
+ do_from_step();
+ g.edge_cnt++;
+}
+
+static void portc_isr_frameinc_do_from(void)
+{
+ uint32_t isfr;
+
+ isfr = PORTC_ISFR;
+ PORTC_ISFR = isfr;
+
+ do_from_step();
+ g.frame_cnt++;
+}
+
+static void udelay(uint32_t us)
+{
+ uint32_t start = micros();
+
+ while ((micros() - start) < us) {
+ asm volatile("nop; nop; nop; nop");
+ yield();
+ }
+}
+
+static void do_start_seq(void)
+{
+ uint32_t edge_cnt_last;
+ uint32_t edge_cnt;
+ uint32_t start, t1, t2;
+ int tout;
+
+ start = micros();
+ edge_cnt = g.edge_cnt;
+
+ /* magic value */
+ g.fixed_state[0] =
+ g.fixed_state[1] = 0x25;
+
+ for (tout = 10000; tout > 0; tout--) {
+ edge_cnt_last = edge_cnt;
+ udelay(100);
+ edge_cnt = g.edge_cnt;
+
+ if (edge_cnt != edge_cnt_last)
+ continue;
+ if (!(GPIOB_PDIR & CORE_PIN0_BITMASK))
+ break;
+ }
+
+ g.fixed_state[0] = 0x33;
+ g.fixed_state[1] = 0x3f;
+ GPIOD_PDOR = 0x33;
+
+ t1 = micros();
+ if (tout == 0) {
+ printf("start_seq timeout1, t=%u\n", t1 - start);
+ return;
+ }
+
+ for (tout = 100000; tout > 0; tout--) {
+ udelay(1);
+
+ if (GPIOB_PDIR & CORE_PIN0_BITMASK)
+ break;
+ }
+
+ t2 = micros();
+ if (tout == 0) {
+ printf("start_seq timeout2, t1=%u, t2=%u\n",
+ t1 - start, t2 - t1);
+ return;
+ }
+
+ //printf(" t1=%u, t2=%u\n", t1 - start, t2 - t1);
+
+ if (g.stream_started) {
+ printf("got start_seq when already started\n");
+ return;
+ }
+
+ if (!g.stream_enable_to && !g.stream_enable_from) {
+ printf("got start_seq, without enable from USB\n");
+ return;
+ }
+
+ if (g.stream_enable_to && g.t_i == g.t_o) {
+ printf("got start_seq while stream_to is empty\n");
+ return;
+ }
+
+ if (g.stream_enable_from && g.f_i != g.f_o) {
+ printf("got start_seq while stream_from is not empty\n");
+ return;
+ }
+
+ __disable_irq();
+ g.stream_started = 1;
+ if (g.stream_enable_to) {
+ if (g.use_readinc) {
+ attachInterruptVector(IRQ_PORTB, portb_isr_do_to_inc);
+ attachInterruptVector(IRQ_PORTC, portc_isr_nop);
+ }
+ else {
+ attachInterruptVector(IRQ_PORTB, portb_isr_do_to);
+ attachInterruptVector(IRQ_PORTC, portc_isr_frameinc);
+ }
+ }
+ else if (g.stream_enable_from) {
+ g.use_pending = 1;
+ if (g.use_readinc) {
+ attachInterruptVector(IRQ_PORTB,
+ portb_isr_fixed_do_from);
+ attachInterruptVector(IRQ_PORTC, portc_isr_nop);
+ }
+ else {
+ attachInterruptVector(IRQ_PORTB, portb_isr_fixed);
+ attachInterruptVector(IRQ_PORTC,
+ portc_isr_frameinc_do_from);
+ }
+ }
+ __enable_irq();
+}
+
+// callers must disable IRQs
+static void clear_state(void)
+{
+ g.stream_enable_to = 0;
+ g.stream_enable_from = 0;
+ g.stream_started = 0;
+ g.stream_ended = 0;
+ g.use_readinc = 0;
+ g.use_pending = 0;
+ g.t_i = g.t_o = 0;
+ g.f_i = g.f_o = 0;
+ g.frame_cnt = 0;
+ attachInterruptVector(IRQ_PORTB, portb_isr_fixed);
+ attachInterruptVector(IRQ_PORTC, portc_isr_nop);
+}
+
+static int get_space_to(void)
+{
+ return STREAM_BUF_SIZE - ((g.t_i - g.t_o) & STREAM_BUF_MASK);
+}
+
+static int get_used_from(void)
+{
+ return (g.f_i - g.f_o) & STREAM_BUF_MASK;
+}
+
+static void do_usb(void *buf)
+{
+ struct tas_pkt *pkt = buf;
+ uint32_t t_i, i;
+ int space;
+
+ switch (pkt->type) {
+ case PKT_FIXED_STATE:
+ memcpy(&i, pkt->data, sizeof(i));
+ if (g.use_pending)
+ g.pending_state32 = i;
+ else
+ g.fixed_state32 = i;
+ break;
+ case PKT_STREAM_ENABLE:
+ __disable_irq();
+ clear_state();
+ /* wait for start from MD */
+ g.stream_enable_to = pkt->enable.stream_to;
+ g.stream_enable_from = pkt->enable.stream_from;
+ g.use_readinc = pkt->enable.use_readinc;
+ __enable_irq();
+ break;
+ case PKT_STREAM_ABORT:
+ __disable_irq();
+ clear_state();
+ __enable_irq();
+ break;
+ case PKT_STREAM_END:
+ g.stream_ended = 1;
+ printf("end of stream\n");
+ break;
+ case PKT_STREAM_DATA_TO:
+ t_i = g.t_i;
+ space = get_space_to();
+ if (space <= pkt->size / STREAM_EL_SZ) {
+ printf("got data pkt while space=%d\n", space);
+ return;
+ }
+ for (i = 0; i < pkt->size / STREAM_EL_SZ; i++) {
+ memcpy(&g.stream_to[t_i++],
+ pkt->data + i * STREAM_EL_SZ,
+ STREAM_EL_SZ);
+ t_i &= STREAM_BUF_MASK;
+ }
+ g.t_i = t_i;
+ break;
+ default:
+ printf("got unknown pkt type: %04x\n", pkt->type);
+ break;
+ }
}
int main(void)
{
- //int ret;
+ uint32_t led_time = 0;
+ uint32_t scheck_time = 0;
+ uint32_t edge_cnt_last;
+ uint32_t edge_cnt;
+ uint8_t buf[64];
+ int ret;
delay(1000); // wait for usb..
+ /* ?0SA 00DU, ?1CB RLDU */
+ g.fixed_state[0] = 0x33;
+ g.fixed_state[1] = 0x3f;
+
printf("starting, rawhid: %d\n", usb_rawhid_available());
- // md pin th tr tl r l d u
+ // md pin th tr tl r l d u vsync
// md bit* 6 5 4 3 2 1 0
- // t bit b16 d5 d4 d3 d2 d1 d0
- // t pin 0 20 6 8 7 14 2
+ // t bit b16 d5 d4 d3 d2 d1 d0 c6
+ // t pin 0 20 6 8 7 14 2 11
// * - note: tl/tr mixed in most docs
pinMode(0, INPUT);
- attachInterrupt(0, pin0_irq, CHANGE);
+ attachInterrupt(0, portb_isr_fixed, CHANGE);
+ attachInterruptVector(IRQ_PORTB, portb_isr_fixed);
+ pinMode(11, INPUT);
+ attachInterrupt(11, portc_isr_nop, RISING);
+ attachInterruptVector(IRQ_PORTC, portc_isr_nop);
+
+ NVIC_SET_PRIORITY(IRQ_PORTB, 0);
+ NVIC_SET_PRIORITY(IRQ_PORTC, 16);
+ SCB_SHPR1 = SCB_SHPR2 = SCB_SHPR3 = 0x10101010;
pinMode( 2, OUTPUT);
pinMode(14, OUTPUT);
// led
pinMode(13, OUTPUT);
- // CORE_PIN13_PORTSET = CORE_PIN13_BITMASK;
- // CORE_PIN13_PORTCLEAR = CORE_PIN13_BITMASK;
// CORE_PIN0_PORTSET CORE_PIN0_BITMASK PORTB_PCR16
+ printf("GPIOB PDDR, PDIR: %08x %08x\n", GPIOB_PDIR, GPIOB_PDDR);
printf("GPIOC PDDR, PDIR: %08x %08x\n", GPIOC_PDIR, GPIOC_PDDR);
printf("GPIOD PDDR, PDIR: %08x %08x\n", GPIOD_PDIR, GPIOD_PDDR);
printf("PORTB_PCR16: %08x\n", PORTB_PCR16);
+ printf("PORTC_PCR6: %08x\n", PORTC_PCR6);
+ printf("PORTD_PCR0: %08x\n", PORTD_PCR0);
+
+ asm("mrs %0, BASEPRI" : "=r"(ret));
+ printf("BASEPRI: %d, SHPR: %08x %08x %08x\n",
+ ret, SCB_SHPR1, SCB_SHPR2, SCB_SHPR3);
- // ret = usb_rawhid_recv(buf, 2000);
- // ret = usb_rawhid_send(buf, 2000);
+ edge_cnt_last = g.edge_cnt;
while (1) {
- delay(4000);
- fixed_state[1] &= ~0x20;
- CORE_PIN13_PORTSET = CORE_PIN13_BITMASK;
+ struct tas_pkt pkt;
+ uint32_t now;
- delay(700);
- fixed_state[1] |= 0x20;
- CORE_PIN13_PORTCLEAR = CORE_PIN13_BITMASK;
+ while (g.stream_enable_to && !g.stream_ended
+ && get_space_to() > sizeof(pkt.data) / STREAM_EL_SZ)
+ {
+ if (g.t_i == g.t_o && g.frame_cnt != 0) {
+ printf("underflow detected\n");
+ g.stream_enable_to = 0;
+ break;
+ }
+
+ pkt.type = PKT_STREAM_REQ;
+ pkt.req.frame = g.frame_cnt;
+
+ ret = usb_rawhid_send(&pkt, 1000);
+ if (ret != sizeof(pkt)) {
+ printf("send STREAM_REQ: %d\n", ret);
+ break;
+ }
+
+ ret = usb_rawhid_recv(buf, 1000);
+ if (ret != 64)
+ printf("usb_rawhid_recv/s: %d\n", ret);
+ else
+ do_usb(buf);
+ }
+
+ while (g.stream_enable_from && !g.stream_ended
+ && get_used_from() >= sizeof(pkt.data) / STREAM_EL_SZ)
+ {
+ uint32_t f_o;
+ int i;
+
+ f_o = g.f_o;
+ for (i = 0; i < sizeof(pkt.data); i += STREAM_EL_SZ) {
+ memcpy(pkt.data + i, &g.stream_from[f_o++],
+ STREAM_EL_SZ);
+ f_o &= STREAM_BUF_MASK;
+ }
+ g.f_o = f_o;
+
+ pkt.type = PKT_STREAM_DATA_FROM;
+ pkt.size = i;
+
+ ret = usb_rawhid_send(&pkt, 1000);
+ if (ret != sizeof(pkt)) {
+ printf("send DATA_FROM: %d\n", ret);
+ break;
+ }
+ }
+
+ now = millis();
+
+ // start condition check
+ if (now - scheck_time > 1000) {
+ edge_cnt = g.edge_cnt;
+ //printf("e: %d th: %d\n", edge_cnt - edge_cnt_last,
+ // (GPIOB_PDIR >> CORE_PIN0_BIT) & 1);
+ if ((g.stream_enable_to || g.stream_enable_from)
+ && !g.stream_started
+ && edge_cnt - edge_cnt_last > 10000)
+ {
+ do_start_seq();
+ edge_cnt = g.edge_cnt;
+ }
+ edge_cnt_last = edge_cnt;
+ scheck_time = now;
+ }
+
+ // led?
+ if (CORE_PIN13_PORTREG & CORE_PIN13_BITMASK) {
+ if ((int)(now - led_time) > 10)
+ CORE_PIN13_PORTCLEAR = CORE_PIN13_BITMASK;
+ }
+
+ // something on rawhid?
+ if (usb_rawhid_available() > 0)
+ {
+ ret = usb_rawhid_recv(buf, 20);
+ if (ret == 64) {
+ led_time = millis();
+ CORE_PIN13_PORTSET = CORE_PIN13_BITMASK;
+
+ do_usb(buf);
+ }
+ else {
+ printf("usb_rawhid_recv: %d\n", ret);
+ }
+ }
}
+
+ return 0;
}
notaz.gp2x.de / megadrive.git / blobdiff