I want to communicate between raspberry pi 1 and a board with V850ES controller. To write/read to/from raspberry pi from/to the controller, I need to know the register address. How to find that? I searched in data sheet but couldnt happen to find it. Kindly help.

  • 1
    Which version of the Pi are you using? Have you enabled I2C via raspi-config? Commented Mar 30, 2016 at 4:42
  • 1
    The SOC can only act as a master - not a slave.
    – Milliways
    Commented Mar 30, 2016 at 5:47
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    Register address? The register address of what? The Pi or the V850?
    – joan
    Commented Mar 30, 2016 at 7:40
  • Thanks everyone for the concern. I am using Raspberry pi 1 and done every configuration related to I2C till installing i2ctools. I want Register address of both pi and V850 as I want to read as well as write onto raspberry pi. Cant raspberry pi act as slave??
    – Vishnu
    Commented Mar 30, 2016 at 8:02
  • There is no workable solution known for making the Pi run as an I2C slave. There is hardware support but no one has been able to create a workable driver in all the years since the Pi was launched. You must assume the Pi runs as a master only.
    – joan
    Commented Mar 30, 2016 at 9:21

1 Answer 1


i am hopping your V850ES is a i2c slave device. every i2c slave device has an address, so check if you can detect is or not. if you don't have i2c tool installed .

do this

update your pi.

sudo apt-get update

upgrade to the latest os.

sudo apt-get dist-upgrade

make sure you also enabled i2c in your kernal. sudo nano /etc/modprobe.d/raspi-blacklist.conf then add a # on the 3rd line. sudo nano /etc/modules Add i2c-dev to a new line.

then try to install i2c tool.

sudo apt-get install i2c-tools

make sure your pi and sensor i2c voltage level are same. if you dont know how you can do that get a pi shield like this.

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