Command Line Interface

-Gordon Sulc
-Shahan Najam

This setup allows you to allocate the pins of an mbed for a specified interface without having to recompile the code. It uses a PS/2 Keyboard as an input device and an LCD as an output device. It can take commands and interpret them according to predefined rules in order to assign/reassign different pins for different interfaces.

Components Used

PS/2 breakout board
LCD display

Hardware Setup

The LCD board was connected through the 'AnalogIn' pins and the PS/2 board was connected through pins 11 and 12 as shown in diagram below.

Purpose

This command line interface lets users specify the functionality of
pins on the fly by typing commands.

Currently Supported

DigitalIn: Read
DigitalOut: read, write
PwmOut: read, write
I2C: read, write
Serial: putc, getc, baud

Functionality

Typed command strings are decoded and executed with the following syntax

DigitalOut

create: DOUT C Pxx
read: DOUT R Pxx
write: DOUT W Pxx [0 or 1]

DigitalIn

create: DIN C Pxx
read: DIN R Pxx

PwmOut

create: PWMO C Pxx
read: PWMO R Pxx
write: PWM O Pxx [float]

I2C

create: I2C C Pxx
(Pxx can be either one of the supported pins in the supported pair,
but you must now use the same pin)
read: I2C R Pxx [address] [number of chars to read]
write: I2C W Pxx [address] [number of chars to write] [char 1] [char 2] .... etc

Serial

Currently the Serial Interface is not working
create: SERIAL C Pxx
(Pxx can be either one of the supported pins in the supported pair,
but you must now use the same pin)
getc: SERIAL G Pxx
putc: SERIAL P Pxx [char to write]
baud: SERIAL B Pxx [baud rate]