https://devzone.nordicsemi.com/f/nordic-q-a/57901/interfacesHi Nordic people, According to my knowledge SPI can not verify the bits whether it is properly sending or not(like ack),speed wise is SPI ok,And in nordic nRF52840 have 4xmasters and 3xslaves =12 we can connect.in i2c i read total 127 slaves we canen-USTelligent Community 13Tue, 18 Feb 2020 13:40:18 GMThttps://devzone.nordicsemi.com/thread/234937?ContentTypeID=1Tue, 18 Feb 2020 13:40:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:eefd5e52-ae1e-4346-9171-6df9a9259af1Einar Thorsrud<p><a href="https://devzone.nordicsemi.com/f/nordic-q-a/57891/serial-interface">Duplicate.</a></p><div style="clear:both;"></div>