On 04/25/2013 05:41 PM, David Kelly wrote:
On Apr 25, 2013, at 9:53 AM, Keith Gudger <[email protected]> wrote:
Have you considered a firmware only USB implementation? Here's
one:http://www.obdev.at/products/vusb/index.html
I've used a similar firmware before, and it worked fine. There seems to be an
i2c implementation here: http://www.harbaum.org/till/i2c_tiny_usb/index.shtml
Those are options. I'm guessing this is a one-off experiment. I'd visit my
favorite vendor, DigiKey, Mouser, Newark, etc, and see what is available in
demo kits with USB. All the manuals and software are online for download from
Atmel. Study them, see what your vendor stocks, and make a selection.
Each demo board has an assortment of demo projects which will come up running
pretty quickly. HID on USB should have multiple options to chose from.
For example I'm currently using an ATxmega256A3BU X-plain board with USB and
LCD and I forget what else. It was about $50. But I'm not using USB or LCD, I
wanted DMA and AES. When/if the time comes to make my own board I'll go back to
the Atmel matrix and select a CPU which meets my needs. But then again if this
one is $8 and another is $7.50 I'll probably not change.
I am quite familiar with the ATmega series.. but never used a USB
version of any of those chips. So now is the time to migrate to
atXmega... the ATXMEGA32A4U looks okay (and is pin compatible with
16/32/64/128k parts).
My question was rather this programming issue - the datasheet is not
very specific about how it is done, the only thing it mentions is
"Bootloader support for programming through any communication interface"
- does that come with an empty chip or I have to flash it specially at
least once?
I am used to GCC+AVRDUDE.
Daniel
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