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1284P Fuse settings confirmation?

Posted by ipper 
1284P Fuse settings confirmation?
May 18, 2016 10:19PM
Hey all, trying to get my repstrap up and running (Sanguinololu w/ a 1284p). I'm seeing different fuse settings depending on where I look.
Currently I'm set to (l,h,e) D6,DA,FD. But I've also seen DC,D7,FD mentioned.

So I figured I'd ask what the community thinks? Do I need a big boot flash? And what Oscillator/Startup/Power settings should I use?
Re: 1284P Fuse settings confirmation?
May 19, 2016 03:10AM
I know when I upgraded mine I used

Low 0xD6
High 0xDC
Ext 0xFD

I use the Gen7 bootloader the size is what they recommend on their page 1k. (It was most reliable at the time, might still be)
Now the gen 7 uses a crystal and the standard SL uses a resonator so don’t use the gen 7 crystal settings
Re: 1284P Fuse settings confirmation?
May 19, 2016 04:49AM
Quote
Dust
Now the gen 7 uses a crystal and the standard SL uses a resonator

That's the same. On the Sanguinololu, crystal and two caps are in one package, on the Gen7 there are 3 separate parts.

Here's a fuse calculator: [www.engbedded.com]


Generation 7 Electronics Teacup Firmware RepRap DIY
     
Re: 1284P Fuse settings confirmation?
May 19, 2016 11:25AM
So the proper settings are:
DC, D7, FD
Same oscillator/crystal settings as gen7 and 1024words for the bootloader?
Thanks!
Re: 1284P Fuse settings confirmation?
June 21, 2016 07:07AM
So, does it mean that the fuses stated in [reprap.org] are wrong ?

I'm refering to a AT1284p in a sanguinololu 1.3 board.

Thanks,
Joao
Re: 1284P Fuse settings confirmation?
June 21, 2016 03:34PM
Fuses are dependent on size of boot loader, which is dependent on what boot loader you use

Plug the values into this fuse calculator to see whats changing between the various options you see, to determine what features are on/off

[eleccelerator.com]

Ive taken a look at above they recommend DC, D7, FD, vs D6, DA, FD on SL page
(all information from the above page)

The low fuses change the Oscillator
0xDC is for external Crystal Oscillator, start up time 258 CK + 64MS
0xD6 is for full swing oscillator, start up time 258 CK + 64ms, Ceramic resonator

Since the SL has a Ceramic resonator, D6 looks correct to me.

The high fuses here change the boot loader size
0xD7 is 512 bytes, also elected to Preserve EEPROM memory through the Chip Erase cycle
0xDA is 2048 bytes, EEPROM memory is erased through the Chip Erase cycle

Extended fuses, set the brown out voltage level
0xFD 2.7v

Edited 4 time(s). Last edit at 06/21/2016 04:00PM by Dust.
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