How to set I2C Speed --- Android 11

[Ethan_Lin 0]

I've looked at other articles, but there's nothing about the settings for the Android version here.

The current specifications I've gathered for I2C range from 100k to 400k, and it's also mentioned that it can be 1M, but I haven't found how to set it. I'd like to know what its minimum can be.

[tooz 52]

hello @Ethan_Lin, 

to change the i2c speed in android 11 is similar to debian:

adb root
adb remount
adb pull /dtoverlay/config.txt (#uncomment intf:i2c6=on, and add overlay=i2c6_100k)
adb push i2c6_100K.dtbo config.txt /dtoverlay/overlays

the dtbo file can be downloaded here: https://www.asuswebstorage.com/navigate/a/#/s/258BFBD7E61045C9BECB7DA044378A844

[Ethan_Lin 0]

1 hour ago, tooz said:

hello @Ethan_Lin, 

to change the i2c speed in android 11 is similar to debian:

adb root
adb remount
adb pull /dtoverlay/config.txt (#uncomment intf:i2c6=on, and add overlay=i2c6_100k)
adb push i2c6_100K.dtbo config.txt /dtoverlay/

the dtbo file can be downloaded here: https://www.asuswebstorage.com/navigate/a/#/s/258BFBD7E61045C9BECB7DA044378A844

I'm trying what you mentioned. I've also seen the same approach in other articles, but in my experiments,

I couldn't verify that it has successfully changed the speed. On Android, "i2cspeed.sh" doesn't seem to execute.

How can I change 100K to 400K or any other value?

[tooz 52]

hello @Ethan_Lin, 

the files were the 10k.dtbo, my mistake. i've put the correct files here: https://www.asuswebstorage.com/navigate/a/#/s/258BFBD7E61045C9BECB7DA044378A844

and then use i2cspeed.sh to verify: 

adb push i2cspeed.sh sdcard/ adb root adb shell sh sdcard/i2cspeed.sh

 

[Ethan_Lin 0]

58 minutes ago, tooz said:

hello  @tooz

"Thank you for your response and help. I'm trying the methods you mentioned but still encountering some issues:
1. I don't have the 'clock-frequency' file on 'i2cspeed.sh'.
2. I attempted to change the path on 'i2cspeed.sh' to point to each file with 'clock-frequency', but none showed as being modified to 100k.
3. How can I modify 'i2c6_100K.dtbo' to experiment with higher and lower settings for comparison?"

 

 

 

[Ethan_Lin 0]

[tooz 52]

hello @Ethan_Lin, 

you can ls to check whether clock-frequency is there or not with ls:

 

3 hours ago, Ethan_Lin said:

I attempted to change the path on 'i2cspeed.sh' to point to each file with 'clock-frequency', but none showed as being modified to 100k

to check if the changes have been applied:

if you have peripherals, you can connect them and test out different speed settings using mraa library:  Developer Guide · TinkerBoard/TinkerBoard Wiki (github.com)

[Ethan_Lin 0]

@tooz

There is no clock-frequency there.

[tooz 52]

hello @Ethan_Lin, 

which version of android 11 os are you using?

[Ethan_Lin 0]

hello @tooz

Tinker_Board_2-Android11-v2.0.15-20230601.img 

[tooz 52]

hello @Ethan_Lin, 

i suspect that the overlay didn't come effectvie. will it be possible for us to have console logs for checking?

 

[tooz 52]

hello @Ethan_Lin, 

there was a small mistake i made in the previous post, the dtbo should be pushed into /dtoverlay/overlays instead of /dtoverlay

adb push i2c6_100K.dtbo config.txt /dtoverlay/overlays