From: Mikko Rasa <tdb@tdb.fi>
Date: Sun, 3 Nov 2013 17:05:33 +0000 (+0200)
Subject: Add a subsystem by which other modules can sync to the output
X-Git-Url: http://git.tdb.fi/?a=commitdiff_plain;h=b70546e9e5c62a1a89c3e9aa0e8f64cc4a937ab2;p=model-railway-devices.git

Add a subsystem by which other modules can sync to the output
---

diff --git a/arducontrol/output.c b/arducontrol/output.c
index e017560..508b411 100644
--- a/arducontrol/output.c
+++ b/arducontrol/output.c
@@ -17,6 +17,7 @@ enum State
 OutputPacket packets[4];
 uint8_t chain_length;
 uint8_t current_packet;
+volatile uint8_t trigger_value;
 volatile uint8_t packet_state = IDLE;
 static uint8_t out_bit;
 static uint8_t out_time;
@@ -35,13 +36,15 @@ OutputPacket *output_create_packet(void)
 {
 	while(packet_state!=IDLE) ;
 	chain_length = 1;
+	packets[0].trigger_position = 0xFF;
 	return &packets[0];
 }
 
 OutputPacket *output_create_chained_packet(void)
 {
-	++chain_length;
-	return &packets[chain_length-1];
+	uint8_t i = chain_length++;
+	packets[i].trigger_position = 0xFF;
+	return &packets[i];
 }
 
 void output_send_packet(void)
@@ -50,9 +53,15 @@ void output_send_packet(void)
 		return;
 
 	current_packet = 0;
+	trigger_value = 0;
 	packet_state = READY;
 }
 
+uint8_t output_get_trigger(void)
+{
+	return trigger_value;
+}
+
 void output_set_power(uint8_t p)
 {
 	if(p==POWER_ON)
@@ -129,6 +138,9 @@ static inline void output_tick(void)
 			else
 				PORTD &= ~BIT(POLARITY);
 
+			if(out_bit==packet->trigger_position)
+				trigger_value = packet->trigger_value;
+
 			out_time = packet->bit_duration;
 		}
 
diff --git a/arducontrol/output.h b/arducontrol/output.h
index 2fde262..0a76c5f 100644
--- a/arducontrol/output.h
+++ b/arducontrol/output.h
@@ -11,12 +11,15 @@ typedef struct
 	uint8_t repeat_count;
 	uint8_t repeat_delay;
 	uint8_t final_delay;
+	uint8_t trigger_position;
+	uint8_t trigger_value;
 } OutputPacket;
 
 void output_init(void);
 OutputPacket *output_create_packet(void);
 OutputPacket *output_create_chained_packet(void);
 void output_send_packet(void);
+uint8_t output_get_trigger(void);
 void output_set_power(uint8_t);
 uint8_t output_is_power_on();
 uint8_t output_command(const uint8_t *, uint8_t);