Yes that was it, thanks. A shame I didn't think about that...
2014-11-14 11:11 GMT+01:00 Uwe Bonnes <bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>:
>>>>>> "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
>
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