>>>>> "Rene" == Rene Doss <doss@xxxxxx> writes:
Rene> Hallo,
Rene> I what to use my FT2232H for a I2C Master. Should be a simple task
Rene> with the following
Rene>
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjUvr7M-OHaAhUILFAKHd_MDvIQFggqMAA&url=http%3A%2F%2Fwww.ftdichip.com%2FSupport%2FDocuments%2FAppNotes%2FAN_255_USB%2520to%2520I2C%2520Example%2520using%2520the%2520FT232H%2520and%2520FT201X%2520devices.pdf&usg=AOvVaw0oXv754fyrRV5xnAl7nnz4
Rene> This document descibe what I need.
But only for FT232H and FT201X! Only these chips can tristate DO!
With FT2232H you need some tristate buffer, like a 74xx126 in the DO data
path and controll the tristate signal with some additional XXBus signal.
But with the MPSSE machine and the Set Data bits XXXByte this can be done
easy.
The needed 3 phase data clocking is already available on the FT2232H
Rene> I have written some code and
Rene> see the I2C message on my oscilloscope. Thats so nice. But I get
Rene> not the NACK it is allways an ACK. (no slave in the bus).
Rene> Now is in in the function SendByteAndCheckACK() a function calls
Rene> FT_GetQueueStatus.
Rene> ftStatus = FT_GetQueueStatus(ftHandle, &dwNumInputBuffer);
Rene> I do not see the function FT_GetQueueStatus in libftdi. Has this
Rene> an other name? Or use FTDI an other polling mechanismus?
See above!
Bye
--
Uwe Bonnes bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
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