I2C Stopped Working

Support for the The Peripherals I2C Control – PiCO – Interface

I2C Stopped Working

Postby Graham S » Sat Feb 07, 2015 10:06 pm

After the latest apt-get update/upgrade I can no longer access I2C.

All the modules are loaded, but no I2C device is found when I used i2cdetect. This is the output of lsmod:

Module Size Used by
8021q 21390 0
garp 7093 1 8021q
stp 2098 1 garp
llc 5666 2 stp,garp
rfcomm 37920 8
bnep 11433 2
ctr 3993 3
ccm 8238 3
rtc_ds1307 10347 0
i2c_dev 6709 0
i2c_bcm2708 6128 0
arc4 1964 4
sg 21787 0
rt2800usb 18970 0
rt2800lib 81833 1 rt2800usb
rt2x00usb 12510 1 rt2800usb
rt2x00lib 48797 3 rt2x00usb,rt2800lib,rt2800usb
mac80211 557796 3 rt2x00lib,rt2x00usb,rt2800lib
evdev 11000 0
cfg80211 472025 2 mac80211,rt2x00lib
crc_ccitt 1612 1 rt2800lib
ecb 2279 1
btusb 23104 0
bluetooth 320752 24 bnep,btusb,rfcomm
rfkill 22347 5 cfg80211,bluetooth
uio_pdrv_genirq 3666 0
uio 9897 1 uio_pdrv_genirq

Any ideas what went wrong?

Graham
Graham S
 
Posts: 46
Joined: Thu Feb 06, 2014 11:07 pm

Re: I2C Stopped Working

Postby n0ahg » Sat Feb 07, 2015 10:37 pm

See http://www.raspberrypi.org/forums/viewt ... 58#p675658

Basically, add "dtparam=i2c_arm=on" to your config.txt and reboot.
n0ahg
 
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Joined: Fri May 23, 2014 11:33 pm


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