https://devzone.nordicsemi.com/f/nordic-q-a/66471/qspi-custom-commands-opcodeHello Devs, I am facing an difficult time to write a custom opcode to a QSPI flash memory. where I am trying to read the manufacture ID, it requires send the OP code + Address+ write dummy bytes + read using nrf_drv_qspi_cinstr_xfer is not possibleen-USTelligent Community 13Tue, 29 Sep 2020 11:59:40 GMThttps://devzone.nordicsemi.com/thread/272045?ContentTypeID=1Tue, 29 Sep 2020 11:59:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ecd61f90-52f5-4e0c-9f59-31bd8135be3fSimonr<p>Hi</p> <p>The QSPI is only able to read and write full words in multiples of 4 bytes. This is because the QSPI peripherals&nbsp;<span>READ and WRITE SRC registers have to point to a word-aligned address and only works in 32-bit words, I.E. ending with 0x0, 0x4, 0x8, or 0xC. Please see&nbsp;<a href="https://infocenter.nordicsemi.com/index.jsp?topic=%2Fps_nrf52840%2Fqspi.html&amp;anchor=register.READ.SRC">the documentation</a>&nbsp;</span>for more information. I know this isn&#39;t much of a further explanation, but the fact is that the HW peripheral is not able to end at any other values.</p> <p><span></span>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>