From 6d4349fc1c542c6a70712f508b4fdaa9eb5f14ee Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Sat, 8 Nov 2014 01:43:06 +0200
Subject: [PATCH] add ability to disable loader sync

---
 host/main.c |  5 +++++
 main.c      | 56 +++++++++++++++++++++++++++++++----------------------
 pkts.h      |  1 +
 3 files changed, 39 insertions(+), 23 deletions(-)

diff --git a/host/main.c b/host/main.c
index 434eaa9..c3a850b 100644
--- a/host/main.c
+++ b/host/main.c
@@ -673,6 +673,7 @@ int main(int argc, char *argv[])
   const char *logfn = NULL;
   uint8_t *tas_data = NULL;
   int use_vsync = 0; // frame increment on vsync
+  int no_start_seq = 0;
   int tas_skip = 0;
   int enable_sent = 0;
   int abort_sent = 0;
@@ -718,6 +719,9 @@ int main(int argc, char *argv[])
       case 'v':
         use_vsync = 1;
         continue;
+      case 'n':
+        no_start_seq = 1;
+        continue;
       default:
         fprintf(stderr, "bad arg: %s\n", argv[i]);
         return 1;
@@ -1043,6 +1047,7 @@ int main(int argc, char *argv[])
       pkt_out.enable.stream_to = (tas_data != NULL);
       pkt_out.enable.stream_from = (outf != NULL);
       pkt_out.enable.use_readinc = !use_vsync;
+      pkt_out.enable.no_start_seq = no_start_seq;
 
       ret = submit_urb(dev.fd, &urb[URB_DATA_OUT], dev.ifaces[0].ep_out,
                        &pkt_out, sizeof(pkt_out));
diff --git a/main.c b/main.c
index 794317b..96b895f 100644
--- a/main.c
+++ b/main.c
@@ -194,6 +194,33 @@ static void portc_isr_frameinc_do_from(void)
 	g.frame_cnt++;
 }
 
+static void choose_isrs(void)
+{
+	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);
+		}
+	}
+}
+
 static void udelay(uint32_t us)
 {
 	uint32_t start = micros();
@@ -276,30 +303,8 @@ static void do_start_seq(void)
 	}
 
 	__disable_irq();
+	choose_isrs();
 	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();
 }
 
@@ -350,6 +355,11 @@ static void do_usb(void *buf)
 		g.stream_enable_to = pkt->enable.stream_to;
 		g.stream_enable_from = pkt->enable.stream_from;
 		g.use_readinc = pkt->enable.use_readinc;
+		if (pkt->enable.no_start_seq) {
+			GPIOD_PDOR = 0x3f;
+			choose_isrs();
+			g.stream_started = 1;
+		}
 		__enable_irq();
 		break;
 	case PKT_STREAM_ABORT:
diff --git a/pkts.h b/pkts.h
index a51b0d0..16877f6 100644
--- a/pkts.h
+++ b/pkts.h
@@ -22,6 +22,7 @@ struct tas_pkt {
 			uint8_t stream_from;
 			// frame increment on read
 			uint8_t use_readinc;
+			uint8_t no_start_seq;
 		} enable;
 	};
 } __attribute__((packed));
-- 
2.39.2