X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=main.c;h=288f94db80c608418488c2bf503ebf88098c8cde;hb=c28a7c811e2c4a565acfa04f57ad02d406692b7e;hp=8287fb5f845eb843815f020417e749dcf1465a74;hpb=9c4f55f45a932dd6c79f99c5e5471d902c72ae9e;p=megadrive.git

diff --git a/main.c b/main.c
index 8287fb5..288f94d 100644
--- a/main.c
+++ b/main.c
@@ -1,12 +1,69 @@
+/*
+ * 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)
 {
@@ -26,37 +83,332 @@ void yield(void)
 {
 }
 
-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 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) {
+		g.t_o = (g.t_o + 1) & STREAM_BUF_MASK;
+		if (g.t_o == g.t_i)
+			// done
+			attachInterruptVector(IRQ_PORTB, portb_isr_fixed);
+		g.frame_cnt++;
+	}
+	g.edge_cnt++;
+}
+
+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++;
+}
+
+static void portc_isr_nop(void)
+{
+	uint32_t isfr;
+
+	isfr = PORTC_ISFR;
+	PORTC_ISFR = isfr;
 }
 
-void portb_isr(void)
+// /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;
 
-	//printf("irq, GPIOB_PDIR: %08x\n", GPIOB_PDIR);
+	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;
+}
 
-	GPIOD_PDOR = fixed_state[(GPIOB_PDIR >> CORE_PIN0_BIT) & 1];
+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);
 
 	pinMode( 2, OUTPUT);
 	pinMode(14, OUTPUT);
@@ -67,24 +419,111 @@ int main(void)
 
 	// 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);
+
+	asm("mrs %0, BASEPRI" : "=r"(ret));
+	printf("BASEPRI: %d\n", ret);
 
-	// 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;
 }