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From: "Peter Hüwe" <PeterHuewe-Mmb7MZpHnFY@public.gmane.org>
To: Wolfram Sang <wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>
Cc: linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: I2C Master with limited transmission sizes
Date: Tue, 19 Nov 2013 00:03:03 +0100	[thread overview]
Message-ID: <201311190003.03429.PeterHuewe@gmx.de> (raw)
In-Reply-To: <20131117111524.GB3093@katana>

Hi Wolfram,

thanks for your answer.
> > I'm currently writing a driver for a cheap usb-to-i2c master device,
> > which unfortunately can only write 31 bytes (+slave addr) and read 32
> > bytes.
> 
> Which one?

CH341 based ones like this one http://wch-ic.com/download/down.asp?id=114
They go for about ~12 USD on ebay so quite affordable.

lsusb shows it as 
ID 1a86:5512 QinHeng Electronics CH341 in EPP/MEM/I2C mode, EPP/I2C adapter


> If you have control over sending start/stop bits, you could omit the
> stop condition unless you transfered all of the 32 byte chunks and issue
> the stop at the end.

This should be possible - I'll give it a try.

Once I've finished my testing I'll post it here for review.


Thanks,
Peter

      reply	other threads:[~2013-11-18 23:03 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-11-16  3:38 I2C Master with limited transmission sizes Peter Hüwe
     [not found] ` <201311160438.36636.PeterHuewe-Mmb7MZpHnFY@public.gmane.org>
2013-11-17 11:15   ` Wolfram Sang
2013-11-18 23:03     ` Peter Hüwe [this message]

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