Sending Controls/Events

[tjensen]

Controls (aka "Events") are sent via offset 0x3110:

So, to send 8700 to control 84137, you could do this:

with FSUIPC() as f:
    f.write([(0x3110, "L", (8700 << 32) | 84137)])

Or, you could write a generic function to send controls:

def send_control(f, control, parameter):
    data = parameter << 32 | control
    f.write([(0x3110, "L", data)])


with FSUIPC() as f:
  send_control(f, 84137, 8700)

[snizbatch]

tjensen, I'm trying to use FSUIPC to set 0x3110 to control the MCP Mach readout on the PMDG 777. I have everything else working but this one is erratic and it is the only 4 byte FLT32 variable I'm trying to set.

mach_value = 830
base = 0x00011000 # integer 69632
OFFSET_MACH = 14503

f.write([(0x3110, "L", (mach_value << 32) | base + OFFSET_MACH)])

Do you have any ideas how I can set this successfully?

Jim H.

[tjensen]

@snizbatch I know nothing about MCP Mach and PMDG 777 so this is just a guess...

If mach_value needs to be a 32-bit float, then I presume you need to encode it properly in the upper dword.

Try changing:

mach_value = 830

to:

import struct

mach_value = struct.unpack("I", struct.pack("f", 830))[0]

[snizbatch]

Tim, Thanks for the reply! I did some playing around with struct pack and unpack before your comment to try to format the integer properly but ended up back at square one. It actually turns out that the SDK shows the float value being set by a 2 digit integer but read as a 32 bit float. I need to contact the publisher (PMDG) and find out why. Thank you for your help in the meantime! Jim Hunt Sent from Mail for Windows From: Tim Jensen Sent: Saturday, December 2, 2023 8:26 PM To: tjensen/fsuipc Cc: James Hunt; Mention Subject: Re: [tjensen/fsuipc] Sending Controls/Events (Discussion #14) @snizbatch I know nothing about MCP Mach and PMDG 777 so this is just a guess... If mach_value needs to be a 32-bit float, then I presume you need to encode it properly in the upper dword. Try changing: mach_value = 830 to: import struct mach_value = struct.unpack("L", struct.pack("f", 830))[0] — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you were mentioned.Message ID: ***@***.***>