AT Keyboard Scan Code Debug Routine

RS232 based Scan Code Debugging for Microchip PIC16F84

Table of Contents [Toc]

Concept
Project Resources
Available Microchip PIC Assembler Source Code

Concept [Toc] [Top]

The Scan Code Debug Routine provides the ability to verify the scan patterns sent by the keyboard. The visualization can be done with the RS232 Debug Interface, an Excel 97 Worksheet.
A screen shot from a debugging session is given below:

RS232 Debug Interface

At the picture above, you can see the strange scan pattern sent by the
AT keyboard when pushing the Pause/Break key:
E1 14 77 E1 FO 14 FO 77

Project Resources [Toc] [Top]

Available Microchip PIC Assembler Source Code [Top]

Main File	HEX Files
Download assembler source code: scan_deb.asm	Download Hex File: scan_deb.hex
The above program needs additional include files (modules) to get successfully assembled: m_bank.asm, m_wait.asm, m_rs192.asm
For those, who are not familiar with interfacing a PIC to the RS232 using a MAX232: RS232-Interface.pdf (9.7 kB)

Download ASCII Character Map: ASCII-Map.pdf

Last updated: 2004/04/18

[Toc] [Top]