From a5a5d069c211304c0c7da2b0dd04889292e40970 Mon Sep 17 00:00:00 2001
From: root <root@avtech.domain.avtechpulse.com>
Date: Thu, 1 Jan 1970 10:29:26 +0900
Subject: do not set XTR polarity line for CH2 if not dual-polarity, to save
 XTR lines

---
 device-functions.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

(limited to 'device-functions.c')

diff --git a/device-functions.c b/device-functions.c
index 9275df7..f616d41 100644
--- a/device-functions.c
+++ b/device-functions.c
@@ -380,11 +380,14 @@ int Set_Amplitude(int check_possible_only,int pol_override,int override_on,int w
 			set_shiftreg_bits(SR_3, POS_7, FIVE_BITS, 1<<relay_range);
 		}
 
-		int pol_bit = globals.Flash.polarity_xtra_rly[channel] + XTR_POS;
-		if (new_ampl<0.0) {
-			set_shiftreg_bits(SR_2, pol_bit, ONE_BIT, BIT_LOW);	/* set O.POL line low to switch pol relay to - */
-		} else {
-			set_shiftreg_bits(SR_2, pol_bit, ONE_BIT, BIT_HIGH);	/* set O.POL line high to switch pol relay to + */
+		// only do this on dual-polarity dual-channel units
+		if ((globals.Flash.min_ampl[channel] * globals.Flash.max_ampl[channel]) < 0.0) {
+			int pol_bit = globals.Flash.polarity_xtra_rly[channel] + XTR_POS;
+			if (new_ampl<0.0) {
+				set_shiftreg_bits(SR_2, pol_bit, ONE_BIT, BIT_LOW);	/* set O.POL line low to switch pol relay to - */
+			} else {
+				set_shiftreg_bits(SR_2, pol_bit, ONE_BIT, BIT_HIGH);	/* set O.POL line high to switch pol relay to + */
+			}
 		}
 	}
 
-- 
cgit