AVR-Chat

On Sun, 22 Jul 2007 20:28:47 -0000
 "Richard Cooke" <rcooke@digitalwavelength.com> 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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