New IT forum
27 June 2022, 06:29:01 pm *
Welcome, %1$s. Please login or register.

: CubieBoard 2 and Cubietruck both now in stock.
 
Pages: [1]

Author Topic: RPi Version 2 hardware change  (Read 3491 times)

apemberton

  • Full Member
  • ***
  • Posts: 187
RPi Version 2 hardware change
« on: 06 December 2012, 07:37:52 pm »

After much tinkering and thinking my i2c temperature hardware (Maxim DS2482S/DS18S20) was not working on version 2 Rpi's (when it was on version 1 Rpi's) I have discovered that pins 3 and 5 on P1 have changed.

On version 1:-
     P1-3 is I2C-0 SDA
     P1-5 is I2C-0 SCL

On version 1:-
     P1-3 is I2C-1 SDA
     P1-5 is I2C-1 SCL

Whilst hardware will still work between versions, configuration files do need to change. In my case that is 'etc/owfs.conf' viz:-

Code: [Select]
# I2C device: DS2482-100
# If Raspberry Pi version 1
#server: device = /dev/i2c-0
# If Raspberry Pi version 2
server: device = /dev/i2c-1

The changes are not particularly obvious in the write-ups so far but certain things might have to be catered for with Gertboards, Piface or Sheepwalk Electronics RPI2 boards. again hardware should be OK but configuration to use '/dev/i2c-1' should be noted.


Logged
Tony Pemberton
Pages: [1]
 
 

Powered by MySQL Powered by PHP SMF 2.0.10 | SMF © 2015, Simple Machines Valid XHTML 1.0! Valid CSS!