Programming:Keyboard scanning: Difference between revisions
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== Hardware scancode table == | == Hardware scancode table == | ||
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== | == One line scanning routine == | ||
This is a routine which scans one line of the keyboard directly. It is approximately 8% faster then the firmware routine and doesn't enable interrupts. | |||
'''Input:''' A = ''layer (&40 - &49) | |||
'''Output:''' A = ''hardware keyboard value'' | |||
'''Destroyed:''' BC | |||
<pre> | <pre> | ||
ld a, layer ;use the value from the table above | ld a, layer ;use the value from the table above | ||
| Line 50: | Line 50: | ||
ld bc, &F600 | ld bc, &F600 | ||
out (c), c | out (c), c | ||
</pre> | |||
Now check for the value from the table | |||
e.g. with''' 'cp <value>' ''' | |||
and a condition | |||
e.g.''' 'jp <condition>, xxxx' '''or''' 'call <condition>, xxxx' ''' | |||
Please note: | |||
* Bit = 0: Key is pressed | |||
* Bit = 1: Key is not pressed | |||
== Complete keyboard scanning routine == | |||
This routine scans the complete keyboard and writes all key status bits in a map. | |||
<pre> | |||
keymap ds 10 ;map with 10*8 = 80 key status bits (bit=0 key is pressed) | |||
; | keyscan di ;1 ##%%## C P C VERSION ##%%## | ||
;e | ld hl,keymap ;3 | ||
;and a | ld bc,#f782 ;3 | ||
; | out (c),c ;4 | ||
ld bc,#f40e ;3 | |||
ld e,b ;1 | |||
out (c),c ;4 | |||
ld bc,#f6c0 ;3 | |||
ld d,b ;1 | |||
out (c),c ;4 | |||
ld c,0 ;2 | |||
out (c),c ;4 | |||
ld bc,#f792 ;3 | |||
out (c),c ;4 | |||
ld a,#40 ;2 | |||
ld c,#4a ;2 44 | |||
loop ld b,d ;1 | |||
out (c),a ;4 select line | |||
ld b,e ;1 | |||
ini ;5 read bits and write into KEYMAP | |||
inc a ;1 | |||
cp c ;1 | |||
jr c,loop ;2/3 9*16+1*15=159 | |||
ld bc,#f782 ;3 | |||
out (c),c ;4 | |||
ei ;1 8 =211 microseconds | |||
ret | |||
</pre> | </pre> | ||
Revision as of 12:57, 27 August 2006
Hardware scancode table
| Value: Layer |
&7F | &BF | &DF | &EF | &F7 | &FB | &FD | &FE |
| &40 | (ZB) | ENTER | F3 | F6 | F9 | CURDOWN | CURRIGHT | CURUP |
| &41 | F0 | F2 | F1 | F5 | F8 | F7 | COPY | CURLEFT |
| &42 | CONTROL | \ | SHIFT | F4 | ] | RETURN | [ | CLR |
| &43 | . | / | : | ; | P | @ | - | ^ |
| &44 | , | M | K | L | I | O | 9 | 0 |
| &45 | SPACE | N | J | H | Y | U | 7 | 8 |
| &46 | V | B | F | G | T | R | 5 | 6 |
| &47 | X | C | D | S | W | E | 3 | 4 |
| &48 | Z | CAPSLOCK | A | TAB | Q | ESC | 2 | 1 |
| &49 | DEL | - | - | - | - | - | - | - |
One line scanning routine
This is a routine which scans one line of the keyboard directly. It is approximately 8% faster then the firmware routine and doesn't enable interrupts.
Input: A = layer (&40 - &49)
Output: A = hardware keyboard value
Destroyed: BC
ld a, layer ;use the value from the table above ld bc, &F6C0 out (c), c ld bc, &F40E out (c), c ld bc, &F792 out (c), c ld b, &F6 out (c), c ld b, &F4 in a, (c) ld bc, &F782 out (c), c ld bc, &F600 out (c), c
Now check for the value from the table e.g. with 'cp <value>' and a condition e.g. 'jp <condition>, xxxx' or 'call <condition>, xxxx'
Please note:
- Bit = 0: Key is pressed
- Bit = 1: Key is not pressed
Complete keyboard scanning routine
This routine scans the complete keyboard and writes all key status bits in a map.
keymap ds 10 ;map with 10*8 = 80 key status bits (bit=0 key is pressed)
keyscan di ;1 ##%%## C P C VERSION ##%%##
ld hl,keymap ;3
ld bc,#f782 ;3
out (c),c ;4
ld bc,#f40e ;3
ld e,b ;1
out (c),c ;4
ld bc,#f6c0 ;3
ld d,b ;1
out (c),c ;4
ld c,0 ;2
out (c),c ;4
ld bc,#f792 ;3
out (c),c ;4
ld a,#40 ;2
ld c,#4a ;2 44
loop ld b,d ;1
out (c),a ;4 select line
ld b,e ;1
ini ;5 read bits and write into KEYMAP
inc a ;1
cp c ;1
jr c,loop ;2/3 9*16+1*15=159
ld bc,#f782 ;3
out (c),c ;4
ei ;1 8 =211 microseconds
ret