This is a basic system control program featuring safety and status indicators. I created it for educational purposes.

• The Start button starts the system.
• The Stop button stops the system, but the system is paused. Once the button is released, the system continues to run.
• The Guard switch prevents the system from running.
• The High-temperature switch also prevents the system from running.

• The Yellow LED (READY) indicates the system's status. If it is lit, the system is ready to run; if it is flashing, the system is running. If it is off, the system is busy.
• The Blue LED (RUNNING) indicates that the system is running.
• The Red LED (GUARD) indicates the status of the guard switch.
• The Red LED (HIGH TEMPERATURE) indicates that the system is overheated.

You can buy an mbed-enabled board, or you can use the mbed simulator. If you prefer using a board, you must use mbed Studio or Keil Studio.

Resources

• The Definitive Guide to the ARM Cortex-M3
• Fast and Effective Embedded Systems Design: Applying the ARM mbed
• The ANSI C Programming Language by Brian W. Kernighan & Dennis M. Ritchie