Subject: Re: background read
ftdi_readstream with libftdi1.0-HEAD-b013bcb works form me nicely
136.0 kB/s totalrate, data is consistent, no misses
Structure of my program:
ftdi_readstream(&ftdic, readCallBack, NULL, 8, 256);
pthread_create ( reader )
Thought the number 8 seems "magic" for me.
For example changing it to 12 leads to rare callback invocation and
to floating point exception
Core was generated by `./test3'.
Program terminated with signal 8, Arithmetic exception.
[New process 7272]
#0 0x00007f8977a14c0a in ftdi_readstream_cb (transfer=0x19da9c0) at
75 int numPackets = (length + packet_size - 1) / packet_size;
2010/7/6 Uwe Bonnes <bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>:
>>>>>> "Anton" == Anton A Litvinov <mirteney@xxxxxxxxx> writes:
> Anton> Hello I am writing a program that should a) continuously read
> Anton> data from FTDI-port in the background and store it into file. b)
> Anton> receive some commands from stdin and do appropriate writes into
> Anton> FTDI-port
> Anton> Questions 1. can a) and b) run in different threads or I should
> Anton> place read and write into a cycle in one thread and read(stdin)
> Anton> -- in another ? and establish link beetween one to another by
> Anton> means of queue (fifo) ?
> Anton> 2. or maybe I should use some kind of non-blocking read ?
> It all depends on data rate and reliability requirements. You can have a
> look at ftdi_stream.c in libftdi-1.0 and the discussion around it. It should
> give you a goos start.
> Uwe Bonnes bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
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With best regards.
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