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

[Paul Mateer]

Hello....

Basically "UCSRB" controls the USART rx/tx enable and interrupt enables.


 Jan 3, 2008 8:27 AM, Andrew <andrew_166 at msn.com> 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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>
>


-- 
Paul Mateer, AA9GG
Elan Engineering Corp.
www.elanengr.com
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