From: Lars-Peter Clausen <lars@metafoo.de>
To: Andrey Smirnov <andrew.smirnov@gmail.com>, linux-iio@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, quad@symbo1ics.com
Subject: Re: [PATCH] iio: si7020: Fix endianness for I2C reads
Date: Fri, 13 Mar 2015 11:45:20 +0100 [thread overview]
Message-ID: <5502BFC0.6050706@metafoo.de> (raw)
In-Reply-To: <1426215198-28630-1-git-send-email-andrew.smirnov@gmail.com>
On 03/13/2015 03:53 AM, Andrey Smirnov wrote:
> Si7020 outputs most significant byte of the measurement result first
> and least significant byte last. As a result the data returned by
> i2c_smbus_read_word_data appears as big endian. Fix this by making a
> call to an approbriate byte conversion routine.
i2c_smbus_read_word_data() returns data in native endianess. But it
interprets the word on the bus as little-endian (As specified by the SMBus
spec). If your chip returns data in big-endian use
i2c_smbus_read_word_data_swapped().
- Lars
next prev parent reply other threads:[~2015-03-13 10:45 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-13 2:53 [PATCH] iio: si7020: Fix endianness for I2C reads Andrey Smirnov
2015-03-13 10:45 ` Lars-Peter Clausen [this message]
2015-03-14 19:48 ` Andrey Smirnov
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