Reading Offset 311C and 311A

[mcp5500]

Hi Pete, My first post here and your site is a great help.  I have a question. I am creating a LUA Menu Display system that displays the softkeys and controls for all functions in the G1000 PFD. The user uses 1- 2 position switch to move through the menu selections up and down and 1 button to activate the item highlighted. I am working on the last part of this scrip and I have created the NAV1 and NAV2 Radio menus. The menus look like what is below so you can see what i am trying to do:

 

As you can see I am reading offset 311E and converting them for display with:

STBYNAV2R = ipc.readSW(0x311E) followed by

STBYNAV2 = (string.format("%04X", STBYNAV2R) + 10000) * .01.

 

The issue I am having is in creating the COM1 and COM2 menus and displaying the STBY frq as where 311C and 311A are only 4 BCD digits not 5 (ie 122.225) so the equations above don't give me the 6th digit. Is there a way of getting that .001 position from reading an offset or do I have to follow the users selections to determine that .001 locations value? Also, if you have the time, is there a way to fix the width of the functions above so as not to drop the lagging 0s? 

 

Thanks in advance

 

LUA Display

 

     G1000 PFD: NAV1

 

1 STBY FRQ INC <---

2 STBY FRQ DEC

3 STBY FRAC INC

4 STBY FRAC DEC

 

STBY FREQ = 114.2     (lagging 0s  wont display) (Updated with each users press)

 

5 ACTIVATE STBY

 

6 BACK

7 CLOSE WINDOW

 

This system works really good over users having to use click-spots in 2D or 3D cockpit

Edited October 25, 2015 by mcp5500

[Pete Dowson]

As you can see I am reading offset 311E and converting them for display with:

STBYNAV2R = ipc.readSW(0x311E) followed by

STBYNAV2 = (string.format("%04X", STBYNAV2R) + 10000) * .01.

 

The issue I am having is in creating the COM1 and COM2 menus and displaying the STBY frq as where 311C and 311A are only 4 BCD digits not 5 (ie 122.225) so the equations above don't give me the 6th digit. Is there a way of getting that .001 position from reading an offset or do I have to follow the users selections to determine that .001 locations value? Also, if you have the time, is there a way to fix the width of the functions above so as not to drop the lagging 0s? 

 

I wouldn't convert it the way you've done it. I'd use

 

string.format("1%02X.%02X", STBYNAV2R/256, STBYNAV2R%256)

 

And why are you bothering about the last 0 or 5. It's always understood that its a 25, 50, 75 or 00. All the normal radios only show 1xx.xx not 1xx.xxx.

 

Pete

[mcp5500]

Thanks Pete, OK i see what you are doing. That also will help with the BARO as well.  I am testing with the Fight1 Super B200 and it shows the .001th location in the PFD COMS display.

 

thanks so much for your help

I will give it a try.

[mcp5500]

OK that worked for NAV. I had to change your line to this: string.format("1%02X.%02X", STBYNAV2R/256, STBYNAV2R%256)  This does show the lagging 0s.