https://devzone.nordicsemi.com/f/nordic-q-a/4253/sd_flash_write-returns-nrf_error_invalid_addrI am using nRF51822 with S130 stack. Some of my flash write works fine, some return NRF_ERROR_INVALID_ADDR, I could not figure out exact cause, all my addres is word-aligned. Also when error happens, I checked flash content of target address, areen-USTelligent Community 13Mon, 03 Nov 2014 12:34:31 GMThttps://devzone.nordicsemi.com/thread/15187?ContentTypeID=1Mon, 03 Nov 2014 12:34:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:49358bbb-a4ff-45cb-8393-a59335daf185Stefan Birnir Sverrisson<p>Ok, then the error code made sense after all. I am glad you found the problem. Please accept your answer in order to mark this case as resolved.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/15186?ContentTypeID=1Fri, 31 Oct 2014 16:07:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4a4d9d04-020a-4736-8656-8415c3919dfaJeffrey Tang<p>It turned out to be our own ignorance, some times the parameter p_src is not word aligned.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/15185?ContentTypeID=1Fri, 31 Oct 2014 14:25:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4c526955-2df4-496d-a60d-fc4513fe847cStefan Birnir Sverrisson<p>Hi</p> <p>Have you tried another nrf51 chip. The flash has specified 20.000 erase/write cycles. Since some addresses are working and some are not, that is the most likely reason I can think of.</p> <p>Are you using the nRF51 development kit, evaluation kit, or custom board?</p> <p>The error code is strange though, as this is a valid address if you are using nRF51 chip with 256kB flash</p><div style="clear:both;"></div>