From 371e301a519387eaae861778efd15b27e63d359d Mon Sep 17 00:00:00 2001
From: Charlie <30303272+charliefoxtwo@users.noreply.github.com>
Date: Tue, 23 Jul 2024 20:12:58 -0700
Subject: [PATCH] OH-58D: Add Standby Altimeter (#884)

Fixes #753
---
 Scripts/DCS-BIOS/doc/Addresses.h              |  7 ++++
 .../lib/modules/aircraft_modules/OH-58D.lua   | 38 ++++++++++++++++++-
 2 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/Scripts/DCS-BIOS/doc/Addresses.h b/Scripts/DCS-BIOS/doc/Addresses.h
index b6cc74fab..99e774776 100644
--- a/Scripts/DCS-BIOS/doc/Addresses.h
+++ b/Scripts/DCS-BIOS/doc/Addresses.h
@@ -28943,6 +28943,13 @@
 #define OH_58D_AIR_VENT_CPLT_A 0x8B3E
 #define OH_58D_AIR_VENT_PLT 0x8B3C, 0xFFFF, 0
 #define OH_58D_AIR_VENT_PLT_A 0x8B3C
+#define OH_58D_ALTIMETER_KNOB 0x8C5E, 0xFFFF, 0
+#define OH_58D_ALTIMETER_KNOB_A 0x8C5E
+#define OH_58D_ALTIMETER_NEEDLE 0x8C60, 0xFFFF, 0
+#define OH_58D_ALTIMETER_NEEDLE_A 0x8C60
+#define OH_58D_ALTIMETER_PRESSURE_A 0x8C62
+#define OH_58D_ALTIMETER_TEN_THOUSANDS_FLAG 0x8C4A, 0x00C0, 6
+#define OH_58D_ALTIMETER_VALUE_A 0x8C66
 #define OH_58D_ARMAMENT_ARMED 0x8A46, 0x0100, 8
 #define OH_58D_ARMAMENT_ARMED_AM 0x8A46, 0x0100
 #define OH_58D_ARMAMENT_GUN 0x8A46, 0x0060, 5
diff --git a/Scripts/DCS-BIOS/lib/modules/aircraft_modules/OH-58D.lua b/Scripts/DCS-BIOS/lib/modules/aircraft_modules/OH-58D.lua
index c73cc6214..47983eaee 100644
--- a/Scripts/DCS-BIOS/lib/modules/aircraft_modules/OH-58D.lua
+++ b/Scripts/DCS-BIOS/lib/modules/aircraft_modules/OH-58D.lua
@@ -978,7 +978,40 @@ OH_58D:definePotentiometer("RWR_BRIGHTNESS", devices.SYNC, 3001, 36, { 0, 0.8 },
 OH_58D:defineToggleSwitch("RWR_DAY_NIGHT", devices.SYNC, 3002, 37, RWR, "Day/Night Switch")
 
 -- Standby Altimeter
--- local STANDBY_ALTIMETER = "Standby Altimeter"
+local STANDBY_ALTIMETER = "Standby Altimeter"
+
+OH_58D:defineRotary("ALTIMETER_KNOB", devices.SENSORS, 3001, 62, STANDBY_ALTIMETER, "Barometric Knob")
+
+OH_58D:defineFloat("ALTIMETER_NEEDLE", 61, { 0, 1 }, STANDBY_ALTIMETER, "Needle") -- this goes -1 to 1 in modelviewer, but in testing the value never drops below 0
+OH_58D:defineString("ALTIMETER_PRESSURE", function(dev0)
+	return tostring(Module.build_gauge_from_arguments(dev0, { 66, 65, 64, 63 }))
+end, 4, STANDBY_ALTIMETER, "Pressure Setting (inHg)")
+
+OH_58D:defineString("ALTIMETER_VALUE", function(dev0)
+	local value = Module.round(dev0:get_argument_value(68) * 10) % 10
+
+	local ten_thousands = Module.round(dev0:get_argument_value(67) * 10) % 10
+
+	if ten_thousands >= 2 then
+		value = value + ((ten_thousands - 1) * 10)
+	end
+
+	return Functions.pad_left(tostring(value) .. "000", 5)
+end, 5, STANDBY_ALTIMETER, "Barometric Altitude")
+
+OH_58D:defineIntegerFromGetter("ALTIMETER_TEN_THOUSANDS_FLAG", function(dev0)
+	local ten_thousands = Module.round(dev0:get_argument_value(67) * 10) % 10
+
+	if ten_thousands == 0 then
+		return 2
+	end
+
+	if ten_thousands == 1 then
+		return 1
+	end
+
+	return 0
+end, 2, STANDBY_ALTIMETER, "Ten Thousands Flag (0 = no flag, 1 = yellow, 2 = red)")
 
 -- Standby Airspeed Indicator
 -- local STANDBY_AIRSPEED_INDICATOR = "Standby Airspeed Indicator"
@@ -998,6 +1031,9 @@ OH_58D:defineToggleSwitch("RWR_DAY_NIGHT", devices.SYNC, 3002, 37, RWR, "Day/Nig
 -- MMS Control Panel
 -- local MMS_CONTROL_PANEL = "MMS Control Panel"
 
+-- PDU
+-- local PDU = "Pilot Display Unit"
+
 -- CMWS
 -- local CMWS = "CMWS"
 -- indication 10