Need PSGroove source help for 3.3v Teensy++ 2.0

**KrzyInuYasha** · 09-24-2010,10:01 AM

Hi I'm hoping some one can help me out here. I want to change my Teensy++ 2.0 to 3.3v, I'm finding at 5v after a few minute of being on the CPU gets quite warm to the touch. While not serious risk of damage warm I tend to run my PS3 for hours on end. I would prefer having the heat be generated by a voltage regulator then the CPU it's self.

The issue I've run into is according to PJRC I have the set CPU_PRESCALE to (0x01) for a 8MHz clock rate for the 3.3v. I have managed to find how to set the make file for the 8MHz clock rate, I have not been able to find any thing in the source related to the CPU_Prescale.

If any one can help me on this I would be grateful, I'm currently trying to use the Hermes source for this.

For those who want to see what PJRC wants in the source for 3.3v usage.
http://www.pjrc.com/teensy/3volt.html

**nolook** · 09-24-2010,04:12 PM

you realize you can unplug the teensy after the debug xmb loads up right?

**KrzyInuYasha** · 09-24-2010,07:32 PM

From my understanding and what has been posted if you unplug the AVR while in Dev mode the system will crash. Hence the reason why I want to convert to 3.3 volts so the CPU will run cooler when left on for hours (8+) to days (up to 2 weeks at times).

**nolook** · 09-24-2010,10:32 PM

nope the ps3 groove project removed this 'crash' you are talking about

**KrzyInuYasha** · 09-25-2010,06:29 AM

Eh what do you know it does work guess you learn some thing new every day. Still though would like to know how to set it for the 3.3v for future referance.

**udip** · 09-25-2010,10:44 PM

You can change the prescale by:

clock_prescale_set(clock_div_16);

But that would change all your program timings. A better way is to halt the processor after the ativitation code is "done"

**udip** · 09-25-2010,11:44 PM

By the way, there is an internal voltage regulator on the chip. Why do they have to add the external regulator? My U2 runs cool with internal regulator.

**jaekid** · 09-26-2010,12:41 AM

dude it really doesn't run THAT hot. i have the same board and noticed that it does become slightly warm after being plugged in for a bit, but definitely nothing to worry about.

i even have placed mine in a case and have absolutely NO worries whatsoever about it.

have you ever touched your cable box or surround sound receiver after its been on for awhile? the nature of pcb's is typically they get a little warm when current is ran through them for a period of time.

you're good with the standard config, promise.

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