This Code Gives the Interfacing of AVR Micro Controller With PS2 Keyboard
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This code gives the interfacing of AVR microcontroller with PS2 keyboard. The keyboard has 2 wires for data transfer, in which one is data line and the other is clock line. For more details about the PC keyboard please check this link http://www.8051projects.info/exp8.asp In this experiment the keyboard is interface with the AVR microcontroller and the typed character is displayed over the LCD display. Circuit Diagram Bascom Code $regfile = "m32def.dat" $crystal = 4000000 Config Lcd = 16 * 2 Config Lcdpin = Pin , Db4 = Porta.2 , Db5 = Porta.3 , Db6 = Porta.4 , Db7 = Porta.5 , Rs = Porta.0 , E = Porta.1 Config Keyboard = Pind.2 , Data = Pind.4 , Keydata = Keydata Dim Text As String * 20 Dim I As Byte Dim L As Byte $serialinput = Kbdinput $serialinput2lcd
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Transcript of This Code Gives the Interfacing of AVR Micro Controller With PS2 Keyboard
This code gives the interfacing of AVR microcontroller with PS2 keyboard. The keyboard has 2 wires for data transfer, in which one is data line and the other is clock line. For more details about the PC keyboard please check this link http://www.8051projects.info/exp8.asp
In this experiment the keyboard is interface with the AVR microcontroller and the typed character is displayed over the LCD display.
Circuit Diagram
Bascom Code
$regfile = "m32def.dat"$crystal = 4000000
Config Lcd = 16 * 2Config Lcdpin = Pin , Db4 = Porta.2 , Db5 = Porta.3 , Db6 = Porta.4 , Db7 = Porta.5 , Rs = Porta.0 , E = Porta.1Config Keyboard = Pind.2 , Data = Pind.4 , Keydata = Keydata
Dim Text As String * 20Dim I As ByteDim L As Byte
$serialinput = Kbdinput$serialinput2lcd
Text = "This is a Test!"L = Len(text)Cursor OffClsPrint TextWait 1For I = 1 To 16 Shiftlcd Right Wait 1
Next I
For I = 1 To L Shiftlcd Left Wait 1Next I
Do
ClsCursor BlinkCursor OnPrint "Enter Text :"Locate 2 , 1Input TextL = Len(text)Cursor NoblinkCursor OffClsPrint TextFor I = 1 To 16 Shiftlcd Right 'Wait 1Next IWait 1L = L + 16For I = 1 To L Shiftlcd Left Wait 1Next ILoop
End
Kbdinput:
$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
Return
I = Getatkbd()
Keydata:
'normal keys lower caseData 0 , 0 , 0 , 0 , 0 , 200 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , &H5E , 0Data 0 , 0 , 0 , 0 , 0 , 113 , 49 , 0 , 0 , 0 , 122 , 115 , 97 , 119 , 50 , 0Data 0 , 99 , 120 , 100 , 101 , 52 , 51 , 0 , 0 , 32 , 118 , 102 , 116 , 114 , 53 , 0Data 0 , 110 , 98 , 104 , 103 , 121 , 54 , 7 , 8 , 44 , 109 , 106 , 117 , 55 , 56 , 0Data 0 , 44 , 107 , 105 , 111 , 48 , 57 , 0 , 0 , 46 , 45 , 108 , 48 , 112 , 43 , 0Data 0 , 0 , 0 , 0 , 0 , 92 , 0 , 0 , 0 , 0 , 13 , 0 , 0 , 92 , 0 , 0Data 0 , 60 , 0 , 0 , 0 , 0 , 8 , 0 , 0 , 49 , 0 , 52 , 55 , 0 , 0 , 0Data 48 , 44 , 50 , 53 , 54 , 56 , 0 , 0 , 0 , 43 , 51 , 45 , 42 , 57 , 0 , 0'shifted keys UPPER caseData 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0Data 0 , 0 , 0 , 0 , 0 , 81 , 33 , 0 , 0 , 0 , 90 , 83 , 65 , 87 , 34 , 0Data 0 , 67 , 88 , 68 , 69 , 0 , 35 , 0 , 0 , 32 , 86 , 70 , 84 , 82 , 37 , 0Data 0 , 78 , 66 , 72 , 71 , 89 , 38 , 0 , 0 , 76 , 77 , 74 , 85 , 47 , 40 , 0Data 0 , 59 , 75 , 73 , 79 , 61 , 41 , 0 , 0 , 58 , 95 , 76 , 48 , 80 , 63 , 0Data 0 , 0 , 0 , 0 , 0 , 96 , 0 , 0 , 0 , 0 , 13 , 94 , 0 , 42 , 0 , 0Data 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 -->
