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

[Donald Delmar Davis]

Not yet, but we have discussed it and I get the impression that it is  
on the way.

FYI Flip wont let you program the fuses or the bootloader area so you  
should be able to reflash the application section with hwb pulled low  
and reset. I generally put a pullup on hwb and reset.


On Jun 30, 2008, at 2:16 PM, Transistor Toaster wrote:

> 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
>>>>>
>>>>> -- 
>>>>> http://www.fastmail.fm - mmm... Fastmail...
>>>>>
>>>> -- 
>>>> 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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