nobody wrote on Sunday, May 07, 2006:
I currently am doing my final year engineering project. I have been asked to develop a Timing system that involves the following features:
- Sensor Mat (Switch)
- LED & Buzzer Feedback
- Wireless communication (or) RS232 Communication
The company currently has wireless units with photocells. So basically the only change is from a photocell to sensor mat (switch).
The firmware on the current units is difficult to read, difficult to upgrade and debug and very unreliable. I have suggested going to a RTOS (freeRTOS).
I am asking anyone for any suggestion or design considerations that I should look into
I plan to use a 32.468KHz crystal for the timing clock, and use a ATMEGA64 running at 8MHz.
The sensor mat is connected to a interrupt.
A few questions:
- Am I right that the RTOS sometimes disables all interrupts? This could be a huge problem if the mat stimulated during this time (interrupts work on rising and falling edge)
- Since I plan to use a separate timer for the timing of the clock I would have the same problem with the interrupts being disabled.
How can I get around this?
I have developed modules for the LED/Buzzer and Communications on previous projects but I have never programmed freeRTOS in a sports timing systems before. If anyone has any suggesting please tell. Or link to other discussion in this forum.