[dorkbotpdx-blabber] How does the AT90USB162 bootloader know of which method

[Transistor Toaster]

Donald,
Thanks for your response. Actually, I tried programming my at90usb162
with FLIP Dean Camera s myUSB with FLIP for the pure purpose of having a
USB to serial converter and next, I had a pain to reprogram it with FLIP
with the HWB pin low on a reset. (I used Dean s project deisnged for the
purpose of usb2serial in the sample code directory) I had the impression
that it disabled the boatloader that is compatible with FLIP.

Does Dean Camera have a mailing list or forum for his myUSB? 

Frank


On Mon, 30 Jun 2008 13:40:48 -0700, "Donald Delmar Davis"
<ddelmardavis at gmail.com> said:
> The at90usb series has a fuse bit for HWB (hardware boot) and if the  
> fuse is set then it checks to see if the HWB pin is pulled before  
> entering either the boot section or the application section. This is  
> pretty well described in the boot sequence section of the datasheet.
> 
> The chips come pre programmed with a boot section that is a Device  
> Firmware Updater. It can be reprogrammed to do whatever. Dean Camera's  
> MyUSB library has source code for a DFU bootloader and one that acts  
> like an stk500 over a cdc device.
> 
> If in your search for more io you check out the 90usb647 family then  
> plan on using deans bootloaders as the stock one is busted.
> 
> Thanks for the links. I am thinking about testing out one of the JTAG  
> clones with the benito for the serial.
> 
> Since you have no fear of tqfp I suggest you check out the  
> mega(16/32/64/)5 family as well as the at90usb64(6/7) all of them have  
> the same footprint as the mega128 at a fraction of the cost. the  
> larger usb parts require only 6 pin changes (the usb specific ones) to  
> work with in the same place as the mega128.
> 
> 
> On Jun 30, 2008, at 10:11 AM, Transistor Toaster wrote:
> 
> > I think I might have emailed this to myself but not the mailing  
> > list, so
> > pardon me if this is a double post.
> >
> > Hello,
> > I was just wondering how does the AT90USB162 know which particular
> > programming method is to be used? If I hold nHWB low and pulse the  
> > RESET
> > line, how does it know it is supposed to talk to the PC with the USB
> > port and not JTAG or ICSP?
> > Frank
> >
> >>
> >> On Sun, 29 Jun 2008 13:09:24 -0400, "Transistor Toaster"
> >> <transistortoaster at fastmail.fm> said:
> >>> Hi,
> >>> I'm a n00b just starting out with AVRS. I have been programming with
> >>> FLIP the AT90USB162. I would like to know that if the benito5 only  
> >>> has
> >>> the capability to program another AVR but not to debug?
> >>> Frank
> >>> -- 
> >>>  Transistor Toaster
> >>>  transistortoaster at fastmail.fm
> >>>
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> >>  Transistor Toaster
> >>  transistortoaster at fastmail.fm
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  Transistor Toaster
  transistortoaster at fastmail.fm

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