>>>>> "Günther" == Günther Grantig <powertomato@xxxxxxxxx> writes:
Günther> Hi, I'm using a FT232RL in bitbang mode to communicate to a
Günther> device with a proprietary protocoll. It has a lot of burst
Günther> writes, but occasionally replies with short messages. For those
Günther> I need reads correlating to specific clock edges.
Günther> The way I intended to do this was:
Günther> 1. change to BITMODE_BITBANG 2. burst write the data 3. change
Günther> to BITMODE_SYNCBB 4. ftdi_usb_purge_rx_buffer 5. toggle the
Günther> clock line a couple of times 6. read the data 7. change back to
Günther> BITMODE_BITBANG and continue writing
Günther> The problem with this solution was, that even after a
Günther> successful "ftdi_usb_purge_rx_buffer" call, the buffer seemed
Günther> to contain data (>200bytes!). Why is this? For now I clear the
Günther> buffer manually by reading it's content.
Can it be that you mix TX and RX. rx_buffer is probably data written by the
PC and read out by the FTDI. So maybe ftdi_usb_purge_tx_buffer is a better
way for your task. For every transaction done by the FTDI there is a
resulting byte read.
Günther> If you need code I'll gladly try to reproduce this in a simpler
Günther> example. The current code is too nested to post here.
--
Uwe Bonnes bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
--
libftdi - see http://www.intra2net.com/en/developer/libftdi for details.
To unsubscribe send a mail to libftdi+unsubscribe@xxxxxxxxxxxxxxxxxxxxxxx
|
