linux-spi.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: arjun rath <rath.arjun-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: SPI-ADC
Date: Thu, 22 Apr 2010 11:50:21 +0530	[thread overview]
Message-ID: <o2idc6d3181004212320neaf99b0az27938c369e1a5557@mail.gmail.com> (raw)

Hi Everybody,

I am using a SPI based 12 bit adc(max1241) from maxim.I am trying to read
the value from adc  using spi_read() in linux kernel.But every time i used
to read i am getting *0xff* only.(i have to read two consecutive bytes).To
the adc chip i am probing with CRO which always shows DOUT pin of ADC as
high provided the input to ADC is always 1.1 volt.
And the clock is also coming as seen in the CRO with Chip select line going
low.

Is it a delay problem since for adc's we have to wait for sometime for
conversion of data....????

Can anybody give some suggestion regarding this....

Thanks in advance
------------------------------------------------------------------------------

             reply	other threads:[~2010-04-22  6:20 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-04-22  6:20 arjun rath [this message]
     [not found] ` <o2idc6d3181004212320neaf99b0az27938c369e1a5557-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-04-22 16:23   ` SPI-ADC H Hartley Sweeten
     [not found]     ` <y2tdc6d3181004222208uf6f4a9ecl7d0e2f084fd56a08@mail.gmail.com>
     [not found]       ` <y2tdc6d3181004222208uf6f4a9ecl7d0e2f084fd56a08-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-04-23 16:58         ` SPI-ADC H Hartley Sweeten
     [not found]           ` <0D753D10438DA54287A00B0270842697636D941949-gaq956PjLg32KbjnnMDalRurcAul1UnsRrxOEX5GOmysTnJN9+BGXg@public.gmane.org>
2010-04-26  7:26             ` SPI-ADC Haavard Skinnemoen
2010-04-26  7:40               ` SPI-ADC arjun rath
  -- strict thread matches above, loose matches on Subject: below --
2010-02-13  5:48 SPI-ADC arjun rath
     [not found] ` <dc6d3181002122148v6451ebffka164de288738485d-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-02-13  6:38   ` SPI-ADC Ben Gamari
2010-02-13 13:48 ` [spi-devel-general] SPI-ADC Linus Walleij
2010-02-13 16:51   ` Jonathan Cameron
2010-02-13 21:20     ` Linus Walleij
     [not found]       ` <63386a3d1002131320u5afbc35ak2bc3533aab3f1e54-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-02-15  4:29         ` SPI-ADC arjun rath
     [not found]           ` <dc6d3181002142029j13a9e57la45aa90a269404fa-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-02-15  8:49             ` SPI-ADC jassi brar
2010-02-15 17:33             ` SPI-ADC Ben Gamari

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=o2idc6d3181004212320neaf99b0az27938c369e1a5557@mail.gmail.com \
    --to=rath.arjun-re5jqeeqqe8avxtiumwx3w@public.gmane.org \
    --cc=spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).