I2C and GPS
larsopoulsen at gmail.com
Thu Nov 24 14:49:44 CET 2011
You can try to add a series resistor to the signals or reducing the drive
strength of the driver.
The frequency of the signals are not that important but rather the rise
This is usually not a problem om i2c but who knows.
On 24/11/2011, at 14.17, Dave <dave.tv at gmail.com> wrote:
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
> 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.
> 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>>
>> 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:-
>> 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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