diff options
| -rw-r--r-- | device-functions.c | 13 |
1 files changed, 8 insertions, 5 deletions
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 + */ + } } } |