How to wakeup from I2C CLK?

[bloobird0]

Hello,

I am currently using the TWIS (slave!) peripheral to get data from a I2C master. Now I would like the ability to place the nRF52 in deep sleep mode with sd_power_system_off() until the master tries to communicate over I2C. Is it possible to use the I2C-CLK signal to wake up the nRF52? If so, how could I do it?

Thanks in advance for your help.

[bloobird0]

Hello,

OK, I will try to disable the I2C peripheral and use the pin as a normal GPIO wake up. I can't add additional line for wake up, but I can make in sort that the master initiates a dummy read request in order to wake up and wait until the nRF52 has initialized the I2C slave.

I will try to use the bsp_wakeup_buttons_set() function as example to wakeup from GPIO pin state change.

For disconnecting the peripheral, is nrf_drv_twis_disable() enough or shall I also call nrf_drv_twis_uninit()?

[bloobird0]

Thanks Alex and RK for your ideas. Very helpfull