Outputs from fsuipc dont follow lvars

[sisoffi]

Hello,
i am continuing to implement my maddogX. I managed to get also the IPC.lvar of the fuel quantity from the maddog team but I am noticing that the assignment of the output digits does not perfectly follow the output sent by fsuipc. The variable
it is assigned via offset lvar, but it seems to overlap values between them. Would anyone know how to help me?

I thank

- ################ FQTY
function md_ipc_fuelleft (varname, value) ipc.writeSTR (0x6950, value) end
function md_ipc_fuelright (varname, value) ipc.writeSTR (0x6954, value) end
function md_ipc_fuelcenter (varname, value) ipc.writeSTR (0x6958, value) end
function md_ipc_fueltotal (varname, value) ipc.writeSTR (0x696C, value) end
function md_ipc_weight (varname, value) ipc.writeSTR (0x6960, value) end

- ################ FQTY
event.Lvar ("md_ipc_fuelleft", lvps, "md_ipc_fuelleft") - (string) | substring with offset = 0x6950 | type = string | size = STR, 4 | substring 0 - 4
event.Lvar ("md_ipc_fuelright", lvps, "md_ipc_fuelright") - (string) | substring with offset = 0x6954 | type = string | size = STR, 4 | substring 0-4
event.Lvar ("md_ipc_fuelcenter", lvps, "md_ipc_fuelcenter") - (string) | offset = 0x6958 | type = string | size = STR, 4 | substring 0 - 4
event.Lvar ("md_ipc_fueltotal", lvps, "md_ipc_fueltotal") - (string) | offset = 0x696C | type = string | size = STR, 5 | substring 0 - 5
event.Lvar ("md_ipc_weight", lvps, "md_ipc_weight") - (string) | offset = 0x6960 | type = string | size = STR, 5 | substring 0 - 5

 

thanks

Simone

[John Dowson]

Lvars are, by default, 8 bytes (64 bits).  If the strings aren't null terminated, ipc.writeSTR will write 8 bytes.

There are two things you could try - specifying the length of the string in the ipc.writeSTR function call, e.g.
     ipc.writeSTR (0x6950, value, 4)

You could also try logging the value, to see what is actually being received and written to the offsets, e.g.

function md_ipc_fuelleft (varname, value)
    ipc.log("md_ipc_fuelleft: received value '" .. value .. "' for lvar " .. varname)
    ipc.writeSTR (0x6950, value, 4)
end

Later: and this:
 

53 minutes ago, sisoffi said:

event.Lvar ("md_ipc_fueltotal", lvps, "md_ipc_fueltotal") - (string) | offset = 0x696C | type = string | size = STR, 5 | substring 0 - 5

should probably be:
    event.Lvar ("md_ipc_fueltotal", lvps, "md_ipc_fueltotal") - (string) | offset = 0x695C | type = string | size = STR, 5 | substring 0 - 5

BUT, you are also using an offset area that is not documented as free for general use - it is Reserved. Try with offsets free for general use, e.g. try from 66C0 or A000.

Edited May 13, 2021 by John Dowson
Further info added

[sisoffi]

thankyou John,

i will test in the afternoon and will report you.

 

Simone