On Thu, 31 Mar 2011, Roberto Inzerillo wrote:
> Hallo everybody, I purchased a few rotary encoder and a bunch of
> 7segment displays to build a physical replacement of the Bendix KX165.
> I'm using Arduino which feeds data to FGFS on a serial connection. I'd
> like to update "instrumentation/comm[0]/frequencies/standby-mhz"
> property using the rotary encoder, I wonder what's the best strategy.
>
> My current setup lets me read the rotary encoder rotation (it's a signed
> int value that measures it's direction and the amount of rotation; e.g.
> +3 equals three steps CW, -1 is 1 step CCW and 0 means it's not
> rotating) and send it to fgsf at 30Hz. This encoder is meant to be the
> KX165 physical equivalent of the frequency selector knob.
>
I would only send the data if it's changed. No sense in running the pump
unless there's something to send.
> I can send those values to FGFS but that's useless as it is now; I
> should make FGFS increment the "standby-mhz" property accordingly;
> problem is that using the generic protocol to feed those data I can't
> use the same approach as in kx165-1.xml where the "property-adjust"
> (with a proper <step> value) command has been used.
>
You might want to trigger an up/down event via Nasal that will do what you
need.
I did something similar to this with the hardware interface software I
built a few years ago.
Here's the Lua end of it:
-----------------------------------------------------------
-- Cockpit Interface Master - Copyright 2008 by Gene Buckle
-- Controls COM1 frequency selection
-----------------------------------------------------------
-- Get the currently selected frequency from the simulator.
Com1Freq = CIM:GetStringValue("COM1_FRQ")
if Com1Freq == "" then
CIM:SetValue(0, "Com1Freq was blank for this cycle.")
return
end
-- Choose the correct frequency "step" based upon what the current
-- simulator needs.
if SimType == "FlightGear" then
kHz_offset = .0250
Mhz_Offset = 1.0
elseif SimType == "MSFS" then
kHz_offset = 2
Mhz_Offset = 100
else
CIM:SetValue(0, "Invalid SimType - >" .. SimType .. "<-")
return
end
-- The next four if..then blocks control how the step up/step down
-- buttons work for gross (Mhz) and fine (kHz) tuning of the COM
-- radio.
-- The routines are written to eliminate "keybounce" by ensuring that
-- the user has released the button before the script terminates.
-- The "CIM:SetValue(0,...)" calls are an easy way to see how the code is
operating
-- if there is a problem with the simulator.
if CIM:GetInput("KHZ_DOWN") == true then
repeat
-- do nothing
until CIM:GetInput("KHZ_DOWN") == false
Com1Freq = Com1Freq - kHz_offset
CIM:SetStringValue("COM1_FRQ", Com1Freq)
CIM:SetValue(0, "KHZ_DOWN ->" .. Com1Freq .. "<-")
return
end
if CIM:GetInput("KHZ_UP") == true then
repeat
-- do nothing
until CIM:GetInput("KHZ_UP") == false
Com1Freq = Com1Freq + kHz_offset
CIM:SetStringValue("COM1_FRQ", Com1Freq)
CIM:SetValue(0, "KHZ_UP - " .. Com1Freq)
return
end
if CIM:GetInput("MHZ_UP") == true then
repeat
-- do nothing
until CIM:GetInput("MHZ_UP") == false
Com1Freq = Com1Freq + Mhz_Offset
CIM:SetStringValue("COM1_FRQ", Com1Freq)
CIM:SetValue(0, "MHZ_UP - " .. Com1Freq)
return
end
if CIM:GetInput("MHZ_DOWN") == true then
repeat
-- do nothing
until CIM:GetInput("MHZ_DOWN") == false
Com1Freq = Com1Freq - Mhz_Offset
CIM:SetStringValue("COM1_FRQ", Com1Freq)
CIM:SetValue(0, "MHZ_DOWN - " .. Com1Freq)
return
end
------------------------------------------
If I can find the files for the FG end of things I'll post them.
g.
--
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