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piface / PiFace-Real-Time-Clock

Installation script for PiFace Real Time Clock.
MIT License
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Wrong i2c bus number on Raspberry Pi model B+ #12

Open dalathu opened 6 years ago

dalathu commented 6 years ago

Hello,

I have used the new installation script (commit 056305b7d383fbde63342de9427f6538d7f0e415) in my Raspberry Pi model B+. It does not work due to that the pifacertc script tries to configure the wrong i2c bus number, i.e. 0 instead of 1. On my Raspberry pi, the i2c bus device is /dev/i2c-1.

Output of /proc/cpuinfo:

$ grep "Revision" /proc/cpuinfo  
Revision        : 0010

I have solved the issue by modifying the 2 following lines in the file /etc/init.d/pifacertc:

i2cset -y 1 0x6f 0x08 0x47

and

echo mcp7941x 0x6f > /sys/class/i2c-dev/i2c-1/device/new_device
csoutreach commented 6 years ago

Thanks -- we'll be posting an updated version that should fix this soon.

sadilekivan commented 3 years ago

Hello,

The same issue occurs on a Raspberry Pi Zero W V1.1 from 2017, changing to i2c-1 worked, just wanted to add it here as a note.

Thanks for the script, I was firstly discouraged and tried many other solutions, which did not work in the end. But after all that tinkering I learned a lot and realized what the issue was.