* multiple byte read/write to I2C device
@ 2011-06-24 21:34 Xianghua Xiao
[not found] ` <BANLkTi=VObOHgC3HsXuOF2rRVzNwbvGHsg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
0 siblings, 1 reply; 2+ messages in thread
From: Xianghua Xiao @ 2011-06-24 21:34 UTC (permalink / raw)
To: linux-i2c-u79uwXL29TY76Z2rM5mHXA
It appears i2cget/i2cset can only handle up to 2 bytes at once, I have
an I2C device that needs to send 4 bytes R/W, can i2cget/i2cset do
that?
Thanks,
Xianghua
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: multiple byte read/write to I2C device
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@ 2011-06-26 20:47 ` Jean Delvare
0 siblings, 0 replies; 2+ messages in thread
From: Jean Delvare @ 2011-06-26 20:47 UTC (permalink / raw)
To: Xianghua Xiao; +Cc: linux-i2c-u79uwXL29TY76Z2rM5mHXA, Guenter Roeck
On Fri, 24 Jun 2011 16:34:15 -0500, Xianghua Xiao wrote:
> It appears i2cget/i2cset can only handle up to 2 bytes at once, I have
> an I2C device that needs to send 4 bytes R/W, can i2cget/i2cset do
> that?
The SVN version of i2cset has support for block writes. This was
contributed by Guenter Roeck in:
http://www.lm-sensors.org/changeset/5911/i2c-tools/trunk/tools
i2cget indeed still lacks support for block reads, but that shouldn't
be too hard to implement, now that the way got paved by i2cset. In the
meantime you may be able to abuse i2cdump's "i" mode and grep the
output, but performance will suffer.
--
Jean Delvare
^ permalink raw reply [flat|nested] 2+ messages in thread
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2011-06-24 21:34 multiple byte read/write to I2C device Xianghua Xiao
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2011-06-26 20:47 ` Jean Delvare
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