PS2 Keyboard Library From Atmel

PS1 Keyboard Interface Don Carveth July 2002

PS-2 (PC-AT) style keyboard interface.
Mirrors all characters typed on PC-AT keyboard on terminal connected to UART.

Based on Atmel App Note AVR-313
Converted supplied c code to GCC 3.2
Based on ATMEGA163 at 8 MHz

*********** REVISION HISTORY **************************
Rev 0 Creation 8/30/02
Converted from IAR to GCC
Operational.

*********** OPERATION *********************************
Connect PS-2 keyboard as shown below - see App note for connection info
Connect UART to terminal program at 19200 baud, 8N1

All standard keys pressed will mirror on terminal. Shift works, and
have no effect.
Hit to alternate between character mode and hex code representation.


Connect an LED to PD5 to ensure the program is running.
Use the test pin at PB1 to monitor progress. Insert test_pin() commands in
the program to toggle the pin - watch on your scope. Only need
for debugging.

To change processor or crystal make changes in StdDefs.h.
Select between polled and interrupt driven UART transmit (putchar) in StdDefs.h

*********** RESOURCES *********************************

Processor: ATMega163
Crystal: 4 MHz
Flash size: 0x7e6 (2022)
RAM Used: 0x9c (156)
EEPROM Used: 0

Pins used:

PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7

PB0
PB1
PB2
PB3
PB4
PB5 MOSI - ISP,
PB6 MISO - ISP,
PB7 SCK - ISP

PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7

PD0 UART Rcv
PD1 UART Txd
PD2 INT0 - Clock
PD3 INT1 - Data
PD4
PD5 Run LED
PD6
PD7

Interrupts:
INT0 - PS-1 Keyboard clock

Timers:

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