One answer in "nrf-connect-sdk-fundamentals" Lesson 6 quiz looks incorrect.

[Rick Cai]

https://academy.nordicsemi.com/courses/nrf-connect-sdk-fundamentals/lessons/lesson-6-serial-com-i2c/quizzes/lesson-6-quiz/

I think "i2c_read()" can only be used by I2C master device to read data from slave device.

Is this answer correct?

[Edvin]

Hello,

I agree that it is a bit unintuitive, but you can use this API as an I2C slave to read data from the I2C master as well.

Best regards,

Edvin

[Rick Cai]

In the param description of "i2c_read", the 4th param "addr" is the target i2c device address. 

Only a slave device has i2c address.

If a slave device uses "i2c_read" to read, what address should we use?