Yes that was it, thanks. A shame I didn't think about that... 2014-11-14 11:11 GMT+01:00 Uwe Bonnes <[email protected]>: >>>>>> "Günther" == Günther Grantig <[email protected]> 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 [email protected] > > 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 [email protected] >
-- libftdi - see http://www.intra2net.com/en/developer/libftdi for details. To unsubscribe send a mail to [email protected]
