ESP32-I2C Occasionally Invalid Readings (IDFGH-14482)

[elecrain]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

General issue report

For a project, I'm using an RTC IC with I2C. Sometimes, esp reads wrong values from registers. I've made a test with logic analyzer and osciloscope and esp logs. Evertime esp makes a reading, it prints out the 7 register. When the problem occurs, oscilloscope and logic anayzer matches out but esp prints are different. Esp prints out that it reads 1 byte different.

This problem only occurs in every 3-5 Hours. What might be the reason ?

The code only uses i2c_master_write_read_device function for reading.

Also notice, everytime this problem occurs, I2C structure misses one byte, and fills it with same as either previous or next byte.

[mythbuster5]

esp32?

[elecrain]

Yes, I'm using ESP32-WROVER-E.

As addition, SDA Pin is GPIO-0 and SCL Pin is GPIO-32.

[mythbuster5]

I guess you encounter the same issue with #12860 please try patch there,.

[elecrain]

Yes, it looks like we have the same issue with #12860. I've made the code update on source file and restarted the test process. I will be updating here if the problem persist to continue. Thanks!

[mythbuster5]

Any result?

[elecrain]

Yesterday, I've had a problem with test setup, I've started to testing today and its being running for 3 hours with no problem. But i will be keep testing for at least a couple of days.