>>>>> "Vaughan" == Vaughan Moss <vaughan@xxxxxxxxx> writes:
Vaughan> --0003255762be49c31e048c473a34 Content-Type: text/plain;
Vaughan> charset=ISO-8859-1
Vaughan> Hi,
Vaughan> I am experimenting using libftdi to implement jtag in our
Vaughan> project to try and get away from using the expensive jtag tools
Vaughan> each manufacturer wants to sell with their respective chips. We
Vaughan> are hoping to place an ft2232h chip on our board and have one
Vaughan> interface to do all the testing and/or programming.
Have a look at the xc3sprog SVN code at sourceforge. ioftdi.cpp implements
JTAG primitives for the use with different JTAG adapters. The read code is
not yet in the shape I like it to be , but it works for me and many
others. Async read of libftdi-1 would come handy, but as long as there is no
clean numbering scheme in libftdi, I fear to use is. Latest libftdi-0 read
handling ( Let ftdi_read_data() honor usb_read_timeout) should also help.
Feel free to reuse the code, give feedback when you fix something. Ask here
if you have problems that you can solve with googling, but I am away the
first two weeks of august.
If you have a FT2232(H preferred), forget about bitbang mode, more complex
and substantial slower.
Vaughan> I have played around with bitbang mode finding all the examples
Vaughan> i could and have now been trying to play with mpsse mode
Vaughan> normally in c and using the python bindings, the area which i
Vaughan> am confused by is the buffer being passed to the chip using
Vaughan> ftdi_write_data.
Vaughan> If anyone could explain what happens below or could point me in
Vaughan> the correct direction I would greatly appreciate it.
Did you read the FT Datasheet and
http://www.ftdichip.com/Documents/AppNotes/AN_108_Command_Processor_for_MPSSE_and_MCU_Host_Bus_Emulation_Modes.pdf
?
Without an understanding of the MPSSE commands and the MPSSE structur, the
buffer values can't be understood.
...
Vaughan> --0003255762be49c31e048c473a34 Content-Type: text/html;
Vaughan> charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Vaughan> <div>Hi,</div><div><br></div><div>I am experimenting using
Plaes, no html in mail.
Bye
--
Uwe Bonnes bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
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