I2C arb lost

Autonomous Machines Jetson & Embedded Systems Jetson TX1
1

Hi,

We have a device which ID address is 0x66 in the i2c-0 loop. Below is the message from syslog, when this issue happens the device couldn’t work.
We know the 0x4c device is a temperature sensor.

In what situation this "arb lost " problem may occur, is there any clue we could pay attention for advanced survey?

Apr 23 01:18:01 tegra-ubuntu kernel: [ 1505.578753] tegra-i2c 7000c000.i2c: arb lost in communicate to add 0x4c
Apr 23 01:18:01 tegra-ubuntu kernel: [ 1505.579022] tegra-i2c 7000c000.i2c: arb lost in communicate to add 0x4c
Apr 23 01:18:01 tegra-ubuntu kernel: [ 1505.579289] tegra-i2c 7000c000.i2c: arb lost in communicate to add 0x4c
Apr 23 01:18:01 tegra-ubuntu kernel: [ 1505.579432] nct1008_nct72 0-004c: nct1008_read_reg: err -11
Apr 23 01:18:01 tegra-ubuntu kernel: [ 1505.591577] tegra-i2c 7000c000.i2c: no acknowledge from address 0x66
Apr 23 01:18:01 tegra-ubuntu kernel: [ 1505.601930] tegra-i2c 7000c000.i2c: arb lost in communicate to add 0x66
Apr 23 01:18:01 tegra-ubuntu kernel: [ 1505.602182] tegra-i2c 7000c000.i2c: no acknowledge from address 0x66
Apr 23 01:18:01 tegra-ubuntu kernel: [ 1505.641712] tegra-i2c 7000c000.i2c: arb lost in communicate to add 0x66

Thanks

2

Does the message still show if not connect your device. (0x66)

3

Hi ShaneCCC

Thanks for your response.
This issue is found by our customer.
We are trying to take the machine for advanced information.

Thanks