A simple cyclic executive for the MBED unit

Description

Design, build and test a simple Cyclic Executive for the MBED unit using an interval of 20ms.

There are 8 actions:

• Measure the frequency of a 3.3v square wave signal once every second
• Read ONE digital input every 300mS
• Output a watchdog pulse every 300mS
• Read TWO analogue inputs every 400mS
• Display the values on the LCD display every 2 seconds
• Check error code every 800mS
• Log the values every 5 seconds (in comma delimited format) onto a uSD card
• Use other slots to check a shutdown switch

Given parameters are:

• Data logging : 1=log to uSD card
• Length of watchdog pulse Range : 20 mS
• Display of error condition: 2=display as flashing blue LED in MBED board
• Show execution time pulse for one of the actions: 1

Authors

Roshenac Mitchell - March 2016