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Forum Index : Microcontroller and PC projects : CMM2: INPUT after INKEY$ problem

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andreas

Senior Member

Joined: 07/12/2020
Location: Germany
Posts: 226
Posted: 07:37am 12 Dec 2024
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Hi,

I'm using the CMM2 Firmware Version 5.0702. I have a code to select an item from a menu:



Function menu(items$)
...
' ask user
 Do
   k$ = Inkey$
   Select Case k$

   Case String$(1,128) ' Up
   ...
   End Select

 Loop Until Asc(k$) = 13 ' Return

 ' restore screen & return value
 ...
 menu = sel ' return value = user selection
 font aktfont
 input dummy$  '(!)
End Function


This code uses the Inkey$ function to get a value k$ from keyboard. After processing my "menu-function" returns the selection to the main program.

The problem is that if an INPUT statement in the main program follows this menu-function the main program is not stopping to get the INPUT value. It is as if something else has put in the value into the INPUT variable.

My solution to this problem is that I add a dummy-INPUT-statement within the menu-Function as last statement. See (!) - the funny thing is, that this "input dummy$" will not stop and aks for a value but continue to the end of the function and return to the calling main program. The ASC(dummy$) is 0.

Now my question: Is it a bug or a feature?
-andreas
 
TassyJim

Guru

Joined: 07/08/2011
Location: Australia
Posts: 6269
Posted: 08:49am 12 Dec 2024
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to flush the input buffer
DO : LOOP UNTIL INKEY$ = ""
VK7JH
MMedit
 
andreas

Senior Member

Joined: 07/12/2020
Location: Germany
Posts: 226
Posted: 10:56am 12 Dec 2024
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  TassyJim said  to flush the input buffer
DO : LOOP UNTIL INKEY$ = ""


Thank you Jim!

The menu(Items$) function lives in an .inc file for a long time without any issues. Now I write a new program, use the good old menu.inc and discover that the INPUT is not working as expected.
I didn't relate inkey$ function and input command to a common buffer.

-andreas
 
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