Re: [uracoli-devel] Sleeping

[Joerg Wunsch]

As Vasilakes, Keith wrote:

> I see the radio drawing about 5-6 ma, and if I try to put it o sleep
> I gt it down to 4...WAY too high!

There must be something wrong.  I'm using a comparable sequence to
yours on an ATmega128RFA1 (and previously also on an ATmega1281 from a
Zigbit module), and the sleep current drops down to ~ 1 µA.  It's a
temperature sensor I'm using to monitor the outside temperature, and
it wakes up only once per 300 s.  (On that ATmega128RFA1 board, I
don't even have a 32 kHz crystal, so I had to use the watchdog
oscillator to wake up.  Works too.)

> set_sleep_mode(SLEEP_MODE_PWR_DOWN);
> cli();
> sleep_enable();
> sei();
> radio_set_state(STATE_SLEEP);
> sleep_cpu();
> sleep_disable();

No need for the complicated individual sleep_* functions.  Just
calling sleep_mode() is the "do everything" function for it.

> there is a timer running off the 32k clock to wake it up...

If you had really put the device to power-down mode, this would turn
off the 32 kHz clock, too.  You need power-save mode.  So if your
device continued to work anyway, it's a good indication you did not
put the CPU to sleep at all. ;-)

Make sure the OCDEN fuse it set to `1' (ie., turned off).  While
it's enabled, the main clock doesn't turn off since the debugging
interface needs it.  Note that debuggers (AVR Studio, AVaRICE)
have a tendency to automatically enable this fuse.
-- 
cheers, J"org               .-.-.   --... ...--   -.. .  DL8DTL

http://www.sax.de/~joerg/                        NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)