From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Jonathan Cameron <jic23@kernel.org>,
Hartmut Knaack <knaack.h@gmx.de>,
Lars-Peter Clausen <lars@metafoo.de>,
Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
Gregory CLEMENT <gregory.clement@bootlin.com>,
linux-iio <linux-iio@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 1/2] iio: adc: ti-ads8344: properly byte swap value
Date: Fri, 17 Apr 2020 16:45:05 +0300 [thread overview]
Message-ID: <CAHp75VdQ58A39HYnW-7CYJgp4+adrzcoiQ4KmTq=0snVAokH9g@mail.gmail.com> (raw)
In-Reply-To: <20200416205428.437503-2-alexandre.belloni@bootlin.com>
On Thu, Apr 16, 2020 at 11:55 PM Alexandre Belloni
<alexandre.belloni@bootlin.com> wrote:
>
> The first received byte is the MSB, followed by the LSB so the value needs
> to be byte swapped.
>
> Also, the ADC actually has a delay of one clock on the SPI bus. Read three
> bytes to get the last bit.
> + return adc->rx_buf[0] << 9 | adc->rx_buf[1] << 1 | adc->rx_buf[2] >> 7;
I just realize, isn't it an open coded variant of ror() / rol()?
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2020-04-17 13:45 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-16 20:54 [PATCH v2 0/2] iio: adc: ti-ads8344: driver improvements Alexandre Belloni
2020-04-16 20:54 ` [PATCH v2 1/2] iio: adc: ti-ads8344: properly byte swap value Alexandre Belloni
2020-04-17 10:44 ` Andy Shevchenko
2020-04-17 10:47 ` Andy Shevchenko
2020-04-17 11:13 ` Alexandre Belloni
2020-04-17 13:43 ` Andy Shevchenko
2020-04-17 13:45 ` Andy Shevchenko [this message]
2020-04-17 14:23 ` Alexandre Belloni
2020-04-18 15:06 ` Jonathan Cameron
2020-04-16 20:54 ` [PATCH v2 2/2] iio: adc: ti-ads8344: optimize consumption Alexandre Belloni
2020-04-18 15:13 ` Jonathan Cameron
2020-04-30 20:17 ` Alexandre Belloni
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