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Forum Index : Microcontroller and PC projects : CMM2: Keyboard Codes - Arrows and Shift

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vegipete

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Joined: 29/01/2013
Location: Canada
Posts: 1132

Posted: 01:33am 18 Dec 2020

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I've been experimenting a bit with reading the keyboard and have puzzled myself slightly.

The following will display the ascii code of any key pressed, along with the state of the modifiers: (left and right shift/ctrl/alt/gui)

do
� �do : k = asc(inkey$) : loop until k <> 0
� �print @(400,100) k, bin$(keydown(7),8) " � �"
loop

The arrow keys give 128,129,130,131 as expected.

However, holding a SHIFT key and pressing arrows is giving unexpected results:
L_SHIFT+LEFT � �130 �00001000 �fine
L_SHIFT+UP � � �128 �00001000 �fine
L_SHIFT+DOWN � �161 �00001000 �huh? Why not 129?
L_SHIFT+RIGHT � 163 �00001000 �huh? Why not 131?

Are the codes for shifted down and right just weird for my keyboard or is something else going on?

Shift-numberpad-arrows gives the expected results, as do other modifiers. It's only shift-down and shift-right that are weird.

Do others see the same?

(Using MMBasic Version 5.06.00RC4)
.
Edited 2020-12-18 11:34 by vegipete

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TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 6283

Posted: 02:56am 18 Dec 2020

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[ said QUOTE=vegipete
L_SHIFT+DOWN � �161 �00001000 �huh? Why not 129?
L_SHIFT+RIGHT � 163 �00001000 �huh? Why not 131?

Are the codes for shifted down and right just weird for my keyboard or is something else going on?

Shift-numberpad-arrows gives the expected results, as do other modifiers. It's only shift-down and shift-right that are weird.

Do others see the same?

(Using MMBasic Version 5.06.00RC4)
.

I get the same results here
If you try playing at a command prompt in Windows, you will find that shift-right and shift-down are used for selection extend so I don't think it is purely a MMBasic thing.

Jim

VK7JH
MMedit

TassyJim

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Location: Australia
Posts: 6283

Posted: 07:09am 18 Dec 2020

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You can add shift-delete = 160 and shift-tab = 159 to the list
As far as I can see, there are 4 undocumented
shift-tab 159
shift-delete �160
shift-down � �161
shift-right � 163

Numeric keypads are always going to be strange so I have left that alone.

Jim
Edited 2020-12-18 17:18 by TassyJim

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matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10310

Posted: 08:37am 18 Dec 2020

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Quote As far as I can see, there are 4 undocumented

No, only two undocumented - check appendix F. I'll ask Geoff to update with the missing 2

jirsoft

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Joined: 18/09/2020
Location: Czech Republic
Posts: 533

Posted: 09:03am 18 Dec 2020

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And 159+160 are my favarites

Jiri
Napoleon Commander and SimplEd for CMM2 (GitHub), CMM2.fun

vegipete

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Location: Canada
Posts: 1132

Posted: 10:07pm 18 Dec 2020

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matherp said

Quote As far as I can see, there are 4 undocumented

No, only two undocumented - check appendix F. I'll ask Geoff to update with the missing 2

So all (USB) keyboards are supposed to work this way? Jolly good, I will write my program according to this behaviour.

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