I am trying to read i2c data from a battery board to an Up Squared 7100 board. This board uses the same 40 pinhead as the raspberry pi so I would think the i2c connection would work the same way.
When testing the battery board on a raspberry pi, I am able to receive i2c data. I am using pin head 3 and 5 and ground
https://pinout.xyz/ https://github.com/up-board/up-community/wiki/How-to-use-the-peripherals-on-40-Pin-Header
When I do the command
sudo i2cdetect -y -r 1
on the raspberry pi I get
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- 0b -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- 36 -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
however when I run the same command on the 7100 I get
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
I would expect the same 0x36 address to be there on the 7100. Why is it not or how can I search for why?
when I do the command ls /sys/bus/pci/devices/*/i2c_designware.1/ | grep i2c on the 7100, I get back i2c-0
The connection was simply running on a different bus on the 7100. It was running on bus 2.
sudo i2cdetect -y -r 2
showed that there was a device on 0x36