From 8b48cbe1bf7dfd5cd7a1400357e9586c29b57aac Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Tue, 11 Jun 2019 22:48:31 +0200
Subject: Fix DMX addresses

---
 src/scanout.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/scanout.c b/src/scanout.c
index 1c5823b..49c6b6b 100644
--- a/src/scanout.c
+++ b/src/scanout.c
@@ -43,7 +43,8 @@ int scanout_all(struct nanolight *nl)
 		int j;
 		struct fixture *fix = &nl->fixtures[i];
 		for ( j=0; j<fix->cls->n_attrs; j++ ) {
-			int pos = fix->base_addr + fix->cls->attrs[j].addr_offset;
+			/* Minus one to convert DMX address to indexing in 'dmx' array */
+			int pos = fix->base_addr + fix->cls->attrs[j].addr_offset - 1;
 			if ( fix->cls->attrs[j].props & ATTR_16BIT ) {
 				dmx[pos] = (fix->attr_vals[j] & 0xff00) >> 8;
 				dmx[pos+1] = fix->attr_vals[j] & 0xff;
-- 
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