https://devzone.nordicsemi.com/f/nordic-q-a/53203/write-in-flash-nrf51822Hi all, I am trying to write in flash but when i use: pg_size = NRF_FICR-&gt;CODEPAGESIZE; pg_num = NRF_FICR-&gt;CODESIZE - 1; // Use last page in flash addr = (uint32_t *)(pg_size * pg_num); flash_page_erase(addr); &lt;=====here is the problem the systemen-USTelligent Community 13Mon, 14 Oct 2019 13:26:04 GMThttps://devzone.nordicsemi.com/thread/214862?ContentTypeID=1Mon, 14 Oct 2019 13:26:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:320cee19-ecf0-4855-9a94-62f79c0c8aeaVidar Berg<p>Hi,</p> <p>Is&nbsp;<span>flash_page_erase() accessing the NVMC directly?&nbsp;The NVMC can&#39;t be accessed directly while the Softdevice is enabled. Instead, it must be accessed through the Softdevice&#39;s Flash API:</span></p> <p><span><a title="Flash memory API" href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s130.sds/dita/softdevices/s130/flash_mem_api/flash_mem_api.html?cp=4_7_2_0_7">Flash memory API</a></span></p> <p><span><a title="sd_flash_page_erase" href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s130.api.v2.0.1/group___n_r_f___s_o_c___f_u_n_c_t_i_o_n_s.html?cp=4_7_2_2_2_7_2_7#ga9c93dd94a138ad8b5ed3693ea38ffb3e">sd_flash_page_erase</a></span></p> <p><span><a title="sd_flash_write" href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s130.api.v2.0.1/group___n_r_f___s_o_c___f_u_n_c_t_i_o_n_s.html?cp=4_7_2_2_2_7_2_9#ga8b49f2e72e97291aecc18ce396956eed">sd_flash_write</a></span></p> <p><span></span></p> <p><span></span></p><div style="clear:both;"></div>