CONFIG KEYBOARD

Action

Configure the GETATKBD() function and tell which port pins to use.

 

 

Syntax

CONFIG KEYBOARD = PINX.y , DATA = PINX.y , KEYDATA = table

 

 

Remarks

KEYBOARD	The PIN that serves as the CLOCK input.
DATA	The PIN that serves as the DATA input.
KEYDATA	The label where the key translation can be found.   The AT keyboard returns scan codes instead of normal ASCII codes. So a translation table s needed to convert the keys. BASCOM allows the use of shifted keys too. Special keys like function keys are not supported.

 

 

The AT keyboard can be connected with only 4 wires: clock,data, gnd and vcc.

Some info is displayed below. This is copied from an Atmel data sheet.

 

The INT0 or INT1 shown can be in fact any pin that can serve as an INPUT pin.

 

The application note from Atmel works in interrupt mode. For BASCOM we rewrote the code so that no interrupt is needed/used.

 

 

 

See also

GETATKBD

 

 

Example

'-----------------------------------------------------------------------------------------
'name : getatkbd.bas
'copyright : (c) 1995-2005, MCS Electronics
'purpose : PC AT-KEYBOARD Sample
'micro : Mega48
'suited for demo : yes
'commercial addon needed : no
'-----------------------------------------------------------------------------------------
 
$regfile = "8535def.dat" ' specify the used micro
$crystal = 4000000 ' used crystal frequency
$baud = 19200 ' use baud rate
$hwstack = 32 ' default use 32 for the hardware stack
$swstack = 10 ' default use 10 for the SW stack
$framesize = 40 ' default use 40 for the frame space
 
'For this example :
'connect PC AT keyboard clock to PIND.2 on the 8535
'connect PC AT keyboard data to PIND.4 on the 8535
 
'The GetATKBD() function does not use an interrupt.
'But it waits until a key was pressed!
 
'configure the pins to use for the clock and data
'can be any pin that can serve as an input
'Keydata is the label of the key translation table
Config Keyboard = Pind.2 , Data = Pind.4 , Keydata = Keydata
 
'Dim some used variables
Dim S As String * 12
Dim B As Byte
 
'In this example we use SERIAL(COM) INPUT redirection
$serialinput = Kbdinput
 
'Show the program is running
Print "hello"
 
Do
'The following code is remarked but show how to use the GetATKBD() function
' B = Getatkbd() 'get a byte and store it into byte variable
'When no real key is pressed the result is 0
'So test if the result was > 0
' If B > 0 Then
' Print B ; Chr(b)
' End If
 
'The purpose of this sample was how to use a PC AT keyboard
'The input that normally comes from the serial port is redirected to the
'external keyboard so you use it to type
Input "Name " , S
'and show the result
Print S
'now wait for the F1 key , we defined the number 200 for F1 in the table
Do
 B = Getatkbd()
Loop Until B <> 0
Print B
Loop
End
 
'Since we do a redirection we call the routine from the redirection routine
'
Kbdinput:
'we come here when input is required from the COM port
'So we pass the key into R24 with the GetATkbd function
' We need some ASM code to save the registers used by the function
$asm
push r16 ; save used register
push r25
push r26
push r27
 
Kbdinput1:
rCall _getatkbd ; call the function
tst r24 ; check for zero
breq Kbdinput1 ; yes so try again
pop r27 ; we got a valid key so restore registers
pop r26
pop r25
pop r16
$end Asm
'just return
Return
 
'The tricky part is that you MUST include a normal call to the routine
'otherwise you get an error
'This is no clean solution and will be changed
B = Getatkbd()
 
'This is the key translation table
 
Keydata:
'normal keys lower case
Data 0 , 0 , 0 , 0 , 0 , 200 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , &H5E , 0
Data 0 , 0 , 0 , 0 , 0 , 113 , 49 , 0 , 0 , 0 , 122 , 115 , 97 , 119 , 50 , 0
Data 0 , 99 , 120 , 100 , 101 , 52 , 51 , 0 , 0 , 32 , 118 , 102 , 116 , 114 , 53 , 0
Data 0 , 110 , 98 , 104 , 103 , 121 , 54 , 7 , 8 , 44 , 109 , 106 , 117 , 55 , 56 , 0
Data 0 , 44 , 107 , 105 , 111 , 48 , 57 , 0 , 0 , 46 , 45 , 108 , 48 , 112 , 43 , 0
Data 0 , 0 , 0 , 0 , 0 , 92 , 0 , 0 , 0 , 0 , 13 , 0 , 0 , 92 , 0 , 0
Data 0 , 60 , 0 , 0 , 0 , 0 , 8 , 0 , 0 , 49 , 0 , 52 , 55 , 0 , 0 , 0
Data 48 , 44 , 50 , 53 , 54 , 56 , 0 , 0 , 0 , 43 , 51 , 45 , 42 , 57 , 0 , 0
 
'shifted keys UPPER case
Data 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0
Data 0 , 0 , 0 , 0 , 0 , 81 , 33 , 0 , 0 , 0 , 90 , 83 , 65 , 87 , 34 , 0
Data 0 , 67 , 88 , 68 , 69 , 0 , 35 , 0 , 0 , 32 , 86 , 70 , 84 , 82 , 37 , 0
Data 0 , 78 , 66 , 72 , 71 , 89 , 38 , 0 , 0 , 76 , 77 , 74 , 85 , 47 , 40 , 0
Data 0 , 59 , 75 , 73 , 79 , 61 , 41 , 0 , 0 , 58 , 95 , 76 , 48 , 80 , 63 , 0
Data 0 , 0 , 0 , 0 , 0 , 96 , 0 , 0 , 0 , 0 , 13 , 94 , 0 , 42 , 0 , 0
Data 0 , 62 , 0 , 0 , 0 , 8 , 0 , 0 , 49 , 0 , 52 , 55 , 0 , 0 , 0 , 0
Data 48 , 44 , 50 , 53 , 54 , 56 , 0 , 0 , 0 , 43 , 51 , 45 , 42 , 57 , 0 , 0

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