https://devzone.nordicsemi.com/f/nordic-q-a/34111/how-to-switch-twi-pinsDue to a hardware design error, the CLK/Data pins on TWI bus was switched in different PCB versions. I want use software to dynamically detect the situation and switch the pins. But the code doesn&#39;t work. Could you help on this? I am using 51822 anden-USTelligent Community 13Sat, 12 May 2018 05:33:25 GMThttps://devzone.nordicsemi.com/thread/131749?ContentTypeID=1Sat, 12 May 2018 05:33:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:917b6767-2991-4690-9130-d87d706e4849jacky<p>Thank you for you reply. &nbsp;I finally found my code works well. I thought it is not working because of the value of Expected_who_am_I was wrong.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/131176?ContentTypeID=1Mon, 07 May 2018 10:34:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d36aad5b-6e48-4054-a148-9e27be2f7816J&#248;rgen Holmefjord<p>What is happening inside function&nbsp;twi_master_init? I do not see any calls to any TWI uninit functions. Are you getting any errors in the second&nbsp;twi_master_init call (NRF_ERROR_INVALID_STATE, etc.)?</p><div style="clear:both;"></div>