Implementing Dynamic I²C Master/Slave Switching on nRF5340 (Zephyr)

[Stefano1984]

Hi,

I'm currently working on a project using the nRF5340, and I've successfully configured the I2C0 interface as a static Master in my .overlay file using the following Zephyr configuration:

&i2c0 {
    compatible = "nordic,nrf-twim";
    status = "okay";
    clock-frequency = <I2C_BITRATE_STANDARD>;
    pinctrl-0 = <&i2c0_default>;
    pinctrl-1 = <&i2c0_sleep>;
    pinctrl-names = "default", "sleep";
};

My goal is this: I'd like the I2C0 to be able to change its role and become a Slave, and vice versa, after an event (like a button press), always using the same SCL/SDA pins.
Is it possible? Can I switch on the fly (runtime) from Master mode (TWIM) to Slave mode (TWIS) on the same I2C0 peripheral?

Thanks in advance for the help!
Stefano

[Kazi Afroza Sultana]

Hello Stefano,

yes, it is possible. We have sample nrfx_prs sample (zephyr\samples\boards\nordic\nrfx_prs) you can look at. 

Thanks.

BR

Kazi