AVR-Chat

Hi Jim,

The code works great - as long as I don't go into power-down mode. 
While it is operating at full speed I never miss a switch press nor do
I get any false triggers.

I'm still trying so I haven't given up yet.

Richard

--- In AVR-Chat@yahoogroups.com, "Jim Wagner" <jim_d_wagner@...> wrote:
>
> Richard -
> 
> This does not address your immediate question but is the
> next step after you solve that. Its tht nasty business of
> switch debounce. 
> 
> If it wakes up on a pin change, then does it start
> executing when the timers are fully up and operating? I've
> never dealt with this situation but I would be uneasy
> whether or not I could reliably use a timer as part of
> switch debounce. I think what I would otherwise try to do
> is start a timer (say 100ms or so) within the interrupt. If
> a second edge inturrupt happens while the timer is running,
> then I would reset the timer but ignore the edge. Question
> is whether or not the timer is fully available during that
> initial interrupt on wakeup. Guess if code is executing, it
> must be?
> 
> Jim
> 
> 
> On Sun, 22 Jul 2007 22:08:51 -0000
>  "Richard Cooke" <rcooke@...> wrote:
> > Jim,
> > 
> > Your post was empty.  I'm desperate and I'm out of ideas.
> > 
> > Thanks,
> > 
> > Richard 
> > 
> > --- In AVR-Chat@yahoogroups.com, "Jim Wagner"
> > <jim_d_wagner@> wrote:
> > >
> > > On Sun, 22 Jul 2007 20:28:47 -0000
> > >  "Richard Cooke" <rcooke@> wrote:
> > > > Hi Folks,
> > > > 
> > > > How do you set up the external interrupt on change to
> > get
> > > > the chip to
> > > > come out of powerdown mode?
> > > > 
> > > > I'm having trouble with getting my Mega48V to come
> > out of
> > > > powerdown. 
> > > > I need to read/debounce 4 tactile switches, power up
> > a
> > > > nRF905 chip,
> > > > send the command and then go back to sleep.
> > > > 
> > > > I've sucessfully run the program if I don't go into
> > sleep
> > > > mode but now
> > > > that I need to test the power consumption I've
> > enabled
> > > > the powerdown
> > > > section.
> > > > 
> > > > Here is the external pin change ISR:
> > > > 
> > > > // Pin change 8-14 interrupt service routine
> > > > interrupt [PCINT1] void pin_change_isr1(void)
> > > > {
> > > > EXT_PIN_INTR_DISABLE;         // Disable any more
> > > > external pin change
> > > > interrupts
> > > > PWR_UP = 1;                   // Power up the nRF905
> > chip
> > > > Switch_State = (PINC & 0x0f); // PC0, PC1, PC2, PC3
> > > > connected to the
> > > > switches
> > > > }
> > > > 
> > > > Here is where I set up the external pin change
> > interrupt
> > > > enable:
> > > > 
> > > > // External Interrupt(s) initialization
> > > > // INT0: Off
> > > > // INT1: Off
> > > > // Interrupt on any change on pins PCINT0-7: Off
> > > > // Interrupt on any change on pins PCINT8-14: On
> > > > // Interrupt on any change on pins PCINT16-23: Off
> > > > EICRA = 0x00;
> > > > EIMSK = 0x00;
> > > > PCICR = 0x02;
> > > > PCMSK1 = 0x0f;
> > > > PCIFR=0x02;
> > > > 
> > > > 
> > > > What else do I have to do?
> > > > 
> > > > Thanks,
> > > > 
> > > > Richard Cooke
> > > > Lake Forest, CA USA
> > > > 
> > > > 
> > > 
> > >
> >
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