libftdi Archives

Subject: Re: Please apply: Streaming read for libftdi-1

From: Thomas Jarosch <thomas.jarosch@xxxxxxxxxxxxx>
To: libftdi@xxxxxxxxxxxxxxxxxxxxxxx
Date: Mon, 31 May 2010 16:17:37 +0200
Hello Uwe,

On Monday, 31. May 2010 16:01:18 Uwe Bonnes wrote:
> with appended code and a revised verilog code, I can reliable read blocks
> of 16 Bytes of date generated about each Microsecond, like running for
> about 500 seconds:
> 8 errors of 375293955 blocks (2.131662e-08), 9 (2.398120e-08) blocks
> skipped
> From time to time some one or two blocks are skipped, which is something
> to expect, as I only have about 128 byte of additional FIFO beside the
> FT2232H internal fifo. First test showed that a larger FIFO lead to some
> more skips, either by some flaw in my logic or some strange behaviour of
> the FT2232H chip.
> Writing the generated data to disk leads to skips for several to several
> ten microseconds each several to several seconds. Probably the BLK (big
> kernel lock) hits here.
> The patch only adds some definition to ftdi.h and the additional file
> ftdi_stream.c, with Micah Dowty okay to dual license his code. so I hope
> it is okay to apply. Should the verilog code be inclided in libftdi too?

As always, thanks for your patch :)

Could you be so nice and comment on the possible time jump
issue I mentioned last time?


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