Actually without this fix I2C crash even with arduino IDE and most recent idf-release/v4.2.
@me-no-dev

19:43:27.250 -> E (162) i2c: i2c_param_config(644): i2c clock choice is invalid, please check flag and frequency
19:43:27.250 -> [   654][E][esp32-hal-i2c.c:1828] i2cInit(): i2c_param_config failed
19:43:27.250 -> Guru Meditation Error: Core  0 panic'ed (LoadProhibited). Exception was unhandled.

You could probably fix it by adding:

conf.clk_flags = 0;

I found the answer at espressif/esp-idf#6293 (comment) and tested it out successfully.

You could probably fix it by adding:

conf.clk_flags = 0;

I found the answer at espressif/esp-idf#6293 (comment) and tested it out successfully.

Thats true, but next time when esp-idf will be updated with new parameter you will have to update this library, and again and again. This way of init variable is good practice:
i2c_config_t conf = {0};

Ah, I get what you're saying. :)

I would say, use memset to set the whole struct to zero, not just the first element :)

i2c_config_t conf;
memset(conf, 0, sizeof(i2c_config_t)); //Might require to #include "string.h"

Well, i always thought it is the way to initialize all elements in struct with 0.

https://stackoverflow.com/questions/6891720/initialize-reset-struct-to-zero-null/6891731#comment46703800_6891773

The answer below that comment also gives some info. And given that this has caused issues on ESP32 before, I suggest you change it to memset :)

Hi,

I am having a similar issue. I am trying to run the ESP-NOW protocol together with the I2C interface but I am getting an error.

I am using the M5Stack ATOM, which uses the ESP32-PICO chip.

This is what I am getting on the serial terminal.

E (39) i2c: i2c_param_config(671): i2c clock choice is invalid, please check flag and frequency I2C slave init failed

I have tried adding this conf.clk_flags= 0; and this i2c_config_t conf; memset(conf, 0, sizeof(i2c_config_t)); to the header file but it is still not working. I am getting the same error message on ther serial terminal.

Can someone please advise on the fix to this issue ?