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

Thu Jan 3 10:10:00 PST 2008

Setting a bit in DDR enables corresponding port pin for output.

So correct io setup for all-inputs i.e. all hi-Z-state is DDRx = 0;

How about reading the datasheet?

Best regards,
Johannes

> Hi

> How does one tri-state all the inputs?

> is this correct?

>  PORTD = 0x00;
>  DDRD  = 0xFF;

> Andy

> ----- Original Message -----
> From: "John Baraclough" <j_baraclough at zetnet.co.uk>
> To: "Discussion list for ICCAVR and ICCtiny Users. You do NOT need
> tosubscribe to icc-announce if you are a member of this."
> <icc-avr at imagecraft.com>
> Sent: Thursday, January 03, 2008 3:37 PM
> Subject: Re: [Icc-avr] Interrupt Help Please (Happy New Year)

>> The processor is clearly in a different state when it goes to sleep from
>> when it first starts up. At a guess, I would say you are leaving a port
>> pin enabled and driving a low level out to a pull-up resistor (possibly
>> more than one). Calculating the extra current; 112uA would be the current
>> drawn through a 47k resistor from a 5V supply (or 30k and 3.3V).
>>
>> What is the mechanism for turning off the RTC? The ideal way to do this is
>> to use a resistive pull-up/pull-down to turn off the RTC and then
>> overdrive it with the appropriate level from a port pin to turn it on.
>> When the processor goes to sleep just tri-state all the port pins so there
>> is no current drawn.
>>
>> HTH
>>
>> John
>>
>> Andrew wrote:
>>> Hi john/anybody ,
>>>  I have a intresting/anoying problem. to recap. I have an AT90USB162. i
>>> am basically trying to send the processor to sleep if Bit 1 on PORTD is
>>> high and wake when the PIN goes low. The basically tells the processor it
>>> has lost main power and is now running on a battery.
>>>  I have the code working well and i am getting 7.12uA when the Processor
>>> is asleep.and my pin interrupt routine works and wakes the processor if
>>> PORTD BIT1 is low and returns back to the 7.12uA when PORTD BIT1 is high.
>>> The problem i have is when i pug the USB in. This also has the same
>>> effect on PORTD BIT 1 as it now takes over powring the system from the
>>> battery.
>>>  So as before if the USB connector is pugged in PORDT BIT 1 goes low and
>>> the processor resumes from sleep. this also works and i can use the USB
>>> port as a serial emulator using some atmel exmaple code. The probelm
>>> comes when i unplug the USB connector. Which sends PORTD BIT 1 high and
>>> thus the processor goes to sleep but it only goes down to 119uA not the
>>> 7.12uA i was getting before. I have checked and the processor is asleep
>>> as the external oscillator is turnned off. So some part of the USB must
>>> be still enabled. Can anybody suggest a solution: -
>>>  CODE
>>>  NOTE : -
>>>
>>> #define USB_CONNECTED (PIND & 0x01)
>>> #define BAT_CONNECTED (PIND & 0x02)
>>>
>>> are defined in a sepearte c file.
>>>
>>>  * *
>>>
>>> *void* sleep(*void*);
>>> *void* wake(*void*);
>>>
>>> //-----------------------------------------------------------------------------
>>> //
>>> // Function name : Sleep
>>> //
>>> // Returns : None
>>> //
>>> // Parameters : None
>>> //
>>> // Purpose : Send the processor into sleep mode (Low power)
>>> //
>>> //-----------------------------------------------------------------------------
>>> *void* sleep(*void*)
>>> {
>>>
>>> SPCR = 0x00;                    // Power Down the SPI
>>> UCSRB = 0x00;                // NOT FOUND THIS IN THe DATASHEET
>>>
>>> REGCR = 0x01;                 // Disable the USB Regulator
>>> RTC_POWER_OFF          // Turn the Power too the RTC OFF (PORTD4)
>>>
>>> EICRA = 0x08;                // Change INT1 Pin Interrupt to Falling Edge
>>> (INT1)
>>>
>>> PRR1 = 0x81;                    // Turn Off the USB and USART using the
>>> power reduction register
>>>
>>> SMCR = 0;                         // Clear SMCR Register
>>> SMCR = 0x05;                   // Configure Sleep Register for Deep Sleep
>>> asm(/"sleep"/);                     // Put Processor into Deep Sleep
>>>
>>> }
>>>
>>> //-----------------------------------------------------------------------------
>>> //
>>> // Function name : Wake
>>> //
>>> // Returns :
>>> //
>>> // Parameters :
>>> //
>>> // Purpose : Return from Sleep mode and restart devices
>>> //
>>> //-----------------------------------------------------------------------------
>>> *void* wake (*void*)
>>> {
>>> PRR1 = 0x00;                 // Restart the USB from Power Reduction Mode
>>> EICRA = 0x0C;              // Change the Battery on pin to interrupt on
>>> rising edge (INT1)
>>> RTC_POWER_ON        // Turn the RTC Power Supply back on (PORTD4)
>>>
>>> UCSRB = 0x98;               // HAVE NO IDEA WHAT THIS REGISTRY IS FOR
>>> SPCR = 0x5C;                 // Restart the SPI
>>> Usb_enable_regulator();    // Enable the USB regulator
>>> }
>>>
>>> //-----------------------------------------------------------------------------
>>> // Main Program Loop
>>> //-----------------------------------------------------------------------------
>>> *void* main(*void*)
>>> {
>>> init_devices();                 // Initilise all the devices
>>>
>>> Usb_enable_regulator(); // Enable the USB Regulator
>>> usb_scheduler_init();       // Set up the USB Scheduler
>>>
>>> *while* (1)
>>> {
>>>
>>> *if*(USB_CONNECTED) // If the USB Connected Pin is High
>>> {
>>> usb_scheduler_tasks();    // Schedule the USB tasks
>>> }
>>>
>>> *if*(BAT_CONNECTED)  // If the Battery Connected Pin is high
>>> {
>>> sleep(); // Call the Sleep function
>>> NOP(); // Small Delay
>>> NOP(); // Small Delay
>>> wake(); // Wake from Sleep and restart USB and SPI
>>>
>>> }
>>>
>>> }
>>> }
>>>
>>>  Andy
>>> ------------------------------------------------------------------------
>>>
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>>>
>>
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