Hi Jim,
Thanks for your input, I was planning to do something similar as well.
It's good to know that it has already been done, and without too much
trouble.
Regards,
Ákos Vandra
On 26 September 2011 17:05, Jim Paris <jim@xxxxxxxx> wrote:
> Akos Vandra wrote:
>> Hello!
>>
>> I am sure you are aware that while most semiconductors' price is
>> getting lower and lower, the prices of FT* chips are rising rising.
>> I've had enough of this, and intend to write a software clone for the
>> FTDI chips using an arm Cortex-M3 or M0 microcontroller.
>>
>> I would like to ask you if there is a summarized document somewhere of
>> the usb transfers that are taking place?
>
> Hi Akos,
>
> I was using the "lpc1343codebase" [1] for a project, and it implements
> a USB CDC device, poorly. The Linux cdc-acm driver is a mess, and I
> was having problems with a bad interaction causing kernel crashes, so
> I made the lpc1343 emulate a FTDI device instead so that I could use
> the much more stable ftdi kernel driver.
>
> It's pretty easy to do. Just copy the descriptors, plug it into
> Linux, and implement each thing that Linux requests until it works,
> using kernel messages and source code to figure out what the right
> responses need to be.
>
> This wasn't a full clone of the ftdi by any sense: no bitbang, SPI,
> etc. Just enough to act as a serial console for the MCU. I can't
> share the code at the moment but I can certainly offer tips if you run
> into any problems.
>
> -jim
>
> [1]
> http://code.google.com/p/lpc1343codebase/source/browse/#svn%2Ftrunk%2Fcore%2Fusbcdc
>
>
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