2010/7/6 Uwe Bonnes <bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>:
>>>>>> "Anton" == Anton A Litvinov <mirteney@xxxxxxxxx> writes:
>
> ...
> Anton> Thought the number 8 seems "magic" for me. For example changing
> Anton> it to 12 leads to rare callback invocation and to floating point
> Anton> exception
>
I realized that
my program is crashing only if ftdi_write_data overlaps with ftdi_readstream
working at the background.
> Anton> Core was generated by `./test3'. Program terminated with signal
> Anton> 8, Arithmetic exception. [New process 7272] #0
> Anton> 0x00007f8977a14c0a in ftdi_readstream_cb (transfer=0x19da9c0) at
> Anton> /home/anton/src/libftdi-1.0-HEAD-b013bcb/src/ftdi_stream.c:75 75
> Anton> int numPackets = (length + packet_size - 1) / packet_size;
>
> Can you give more background, like what OS, what libusb-1 version etc.
>
Linux desktop 2.6.34-5-generic #14~lucid1-Ubuntu SMP Thu Jun 3
14:51:20 UTC 2010 x86_64 GNU/Linux
libftdi-1.0-HEAD-b013bcb (25 june 16:45)
> On a first rough test serveral runs with "12" on my hardware (FT2232H in
> sync fifo mode, libusb-1_0-0-1.0.6-17.1.x86_64, linux) didn't result in a
> crash.
>
> Perhaps run in gdb and when you hit the error type "p length<CR>p
> packet_size <CR>" and give us the returned numbers.
>
Core was generated by `./test'.
Program terminated with signal 8, Arithmetic exception.
[New process 5564]
#0 0x00007fb09ccadc0a in ftdi_readstream_cb (transfer=0x790e30) at
/home/anton/src/libftdi-1.0-HEAD-b013bcb/src/ftdi_stream.c:75
75 int numPackets = (length + packet_size - 1) / packet_size;
(gdb) info locals
i = 7886048
length = 448
ptr = (uint8_t *) 0x790ea0 "1`!`�\236\b"
numPackets = 0
res = 0
state = (FTDIStreamState *) 0x7fb09bef6020
packet_size = 0
> The numbers where taken from the original fastftdi code.
>
> Bye
> --
> Uwe Bonnes bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
> --------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
>
> --
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>
>
--
With best regards.
Anton
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