[Icc-avr] Interrupt Help Please (Happy New Year)

[Johannes Assenbaum]

You still may need to enable interrupts by

   SEI();
or
   asm("sei");

before entering sleep mode.

Best regards,
Johannes


> You need to initialise the interrupts correctly so that they respond to
> the appropriate edges.

> I once solved a problem by putting a couple of NOPs after the sleep
> instruction and have always done it since. I still don't know why it
> worked but it's just routine now.

>   asm("sleep");
>   asm("nop");
>   asm("nop");

> HTH

> John


> Andrew wrote:
>> Hi John,
>>
>> My main code is basically this: -
>> //-----------------------------------------------------------------------------
>>
>> // Sleep Function
>> //-----------------------------------------------------------------------------
>>
>>
>>
>> void sleep_mode(void)
>> {
>>
>> DF_Deep_Power_Down();
>> DF_Deep_Power_Down_2();
>>
>> SPCR = 0x00;
>> ACSR |= 0x80;
>>
>> UCSRB = 0x00;
>> PRR1 |= 0x08;
>> REGCR |= 0x01;
>>
>> PORTD = 0x00;
>>
>> //port_init_off();
>>
>> SMCR = 0;
>> SMCR = 5;
>> asm("sleep");
>> }
>>
>> //-----------------------------------------------------------------------------
>>
>> // Main Program Loop
>> //-----------------------------------------------------------------------------
>>
>> void main(void)
>> {
>>
>> init_devices();
>>
>> Usb_enable_regulator();
>> usb_scheduler_init();
>>
>> sleep_mode();
>>
>> while (1)
>> {
>>
>>
>> if(!TestBit(bFlags,TEST_MODE))
>> usb_scheduler_tasks();
>>
>> }
>> }
>>
>> //-----------------------------------------------------------------------------
>>
>> // INT0 - Interruopt Handler
>> //-----------------------------------------------------------------------------
>>
>> #pragma interrupt_handler int0_isr:iv_INT0
>> void int0_isr(void)
>> {
>> //external interupt on INT0
>> }
>>
>> What i need to do is if either INT0 or INT1 go from low to high i need
>> to wake the system from sleep and re-enable the USB and SPI, but i am
>> having problems.INT0 goes from low to high if a USB cable is pulgged
>> in and INT1 is high if the device switchs from a battery source to a
>> main power source. either of these need to resut in waking the system.
>> Then i put the system to sleep if INT1 is low and reset theinterrupts.
>> Andy help would be good.
>>
>> Thanks,
>>
>> Andy

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