I2C and GPS

Dave dave.tv at gmail.com
Thu Nov 24 14:16:45 CET 2011


Ferrite beads aid with removing VHF-SHF feedback and/or uncontrolled
oscillation mainly. I cannot see why they would be of use on a (500khz?)
I2C bus. At that frequency they would have minimal effect.

On Thu, Nov 24, 2011 at 9:44 PM, Benjamin Deering <ben_deering at swissmail.org
> wrote:

> With the i2c devices removed, I get TTFF of around 1 minute in shr-core.
>  It sounds like putting ferrite beads on SDA and SCL might help reduce EMI,
> so I will try that when I get a chance.
> Ben
> On 11/23/2011 05:06 PM, dmatthews.org wrote:
>> On Tue, 22 Nov 2011 21:20:16 -0500
>> Benjamin Deering<ben_deering at swissmail.**org <ben_deering at swissmail.org>>
>>  wrote:
>> Hi Ben
>> Not sure this is relevent to you, but I now have the fastest GPS fix I've
>> ever had on the freerunner.
>> QTMoko v35 and I put this in /etc/default/gpsd:-
>> START_DAEMON="true"
>> DEVICES="/dev/ttySAC1"
>> USBAUTO="false"
>> GPSD_SOCKET="/var/run/gpsd.**sock"
>> Before doing this it was pretty poor - worse than earlier versions of
>> qtmoko and much worse than every SHR I've tried. On a reasonably clear day
>> I now reliably get a fix in under a minute, sometimes within a few seconds.
>> The only other varying factor (doubtful relevence) is that I got pissed
>> with QTMoko and to a lesser extent SHR foobarring the SD card, so I'm now
>> running from the card instead of NAND and everything is pretty good
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