https://devzone.nordicsemi.com/f/nordic-q-a/32692/frequency-setting-400khz-with-gazellI am currently working with an NRF51822 and managed to change the TWI frequency to 400kHz in the twi_hw_master (this worked, I can see it on the oscilloscope). I commented out the functions with the same name out of the twi_sw_master and included bothen-USTelligent Community 13Mon, 26 Mar 2018 11:57:58 GMThttps://devzone.nordicsemi.com/thread/125934?ContentTypeID=1Mon, 26 Mar 2018 11:57:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ba25bbec-956f-43ec-bf21-a32d2610a04cKenneth<p>There is no dependency between TWI and Gazell.&nbsp;The case you refer to discuss the frequency used in the 2.4GHz band for communication, while frequency on a serial interface (such as TWI) has no relationship to the radio.</p> <p>To use TWI you will either need to use the hardware implementation or the software implementation, not both.</p><div style="clear:both;"></div>