2010/7/6 Uwe Bonnes <[email protected]>: >>>>>> "Anton" == Anton A Litvinov <[email protected]> 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 [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] > > -- With best regards. Anton -- libftdi - see http://www.intra2net.com/en/developer/libftdi for details. To unsubscribe send a mail to [email protected]
