I want to use the RTC registers to save data after reset or power up. I read everything in the forum I could find including the "Non-volitile Variable storage" topic. I need some guidance on how to store my variables and how to recall them on reset or powerup. In the "Non-volitile Variable storage" topic there are two Void functions; how would I call these to store and restore.

If I store my variable every time it changes to a RTC register such as:

LPC_RTC->GPREG0 = MOTOR_WATTHOURS

LPC_RTC->GPREG1 = FAN WATTHOURS

How would I recall the values from the register before the main() starts after a reset or powerup??

Thanks Bill Lynn

You can read the values the same way you write them:

motor_wh = LPC_RTC->GPREG0;
fan_wh = LPC_RTC->GPREG1;

Just add some check for valid values to account for the initial run.

But why do you need them before main()?

Really don't want them before main as you suggest; I really ment that I wanted them when main() starts.

Its working fine now; also had to add a watchdog timer. I'm using it for PACHUBE feeds on www.wjlengineering.com. Great product(mbed that is)!

Another question; is there a "easy"way to reset the RTC registers to zero.

Well, how about just writing zeros into them?

I already do that but it requires that I reload a new file into the mbed and after resetting the registers I have to load the regular file back in. I was wondering if there was an easier way????