From f3549d775cb049bcde93c3e860c3adbad3763364 Mon Sep 17 00:00:00 2001 From: Lorenz Meier Date: Mon, 14 Jul 2014 08:33:35 +0200 Subject: [PATCH] Airspeed driver: Use the known sensor offset for raw value as well --- src/drivers/ets_airspeed/ets_airspeed.cpp | 3 +++ src/drivers/meas_airspeed/meas_airspeed.cpp | 5 ++++- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/src/drivers/ets_airspeed/ets_airspeed.cpp b/src/drivers/ets_airspeed/ets_airspeed.cpp index d1a9fa57c8..c15a0cee43 100644 --- a/src/drivers/ets_airspeed/ets_airspeed.cpp +++ b/src/drivers/ets_airspeed/ets_airspeed.cpp @@ -172,6 +172,9 @@ ETSAirspeed::collect() diff_pres_pa = diff_pres_pa_raw - _diff_pres_offset; } + // The raw value still should be compensated for the known offset + diff_pres_pa_raw -= _diff_pres_offset; + // Track maximum differential pressure measured (so we can work out top speed). if (diff_pres_pa > _max_differential_pressure_pa) { _max_differential_pressure_pa = diff_pres_pa; diff --git a/src/drivers/meas_airspeed/meas_airspeed.cpp b/src/drivers/meas_airspeed/meas_airspeed.cpp index 7763f10578..07611f9039 100644 --- a/src/drivers/meas_airspeed/meas_airspeed.cpp +++ b/src/drivers/meas_airspeed/meas_airspeed.cpp @@ -225,7 +225,10 @@ MEASAirspeed::collect() // correct for 5V rail voltage if possible voltage_correction(diff_press_pa_raw, temperature); - float diff_press_pa = fabsf(diff_press_pa_raw - _diff_pres_offset); + // the raw value still should be compensated for the known offset + diff_press_pa_raw -= _diff_pres_offset; + + float diff_press_pa = fabsf(diff_press_pa_raw); /* note that we return both the absolute value with offset