https://devzone.nordicsemi.com/f/nordic-q-a/73750/busrt-read-128-byte-fifo-using-spiHallo, I am trying to communicate MAX86140 sensor with nrf52840DK. This is the link to the datasheet of MAX86140/1 . I am able to write and read MAX registers successfully. MAX86140 consist of a 128 byte FIFO which has to be burst read for data, Theen-USTelligent Community 13Tue, 13 Apr 2021 14:29:19 GMThttps://devzone.nordicsemi.com/thread/304612?ContentTypeID=1Tue, 13 Apr 2021 14:29:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7770dbe9-8133-4f47-89b6-ce8661845b6dKalrz <p>Hallo Jorgen,</p> <p></p> <p>Thanks for the reply. I will try out and in case if I face any problem, I will update here.</p> <p>best regards,</p> <p>Karlz</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/303827?ContentTypeID=1Thu, 08 Apr 2021 14:45:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:93dffde8-248d-467c-8956-641d3b7cb763J&#248;rgen Holmefjord<p>Hi,</p> <p>The nrf_drv_spi API can support up to 255 bytes of read/write in a single transfer. All you need to do is to increase the rx_/tx_buffer_length parameters passed to <a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/group__nrf__drv__spi.html#ga8502179e5c7d7a7da5104a4c1febe1e0">nrf_drv_spi_transfer</a><span>() to the desired length. Note that the RX buffer will be filled while the first address byte being written, so if you want to read 128 bytes&nbsp;<em>after</em> this byte have been written, you need to increase the RX length with 1 byte to 129 bytes, and then ignore the first byte in the RX buffer.</span></p> <p><span>In nRF52840, even longer read/writes can be supported (up to 65535 bytes) using the <a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/nrfx_migration_user_guide.html?cp=7_1_2_7_1#getting_started_replace_nrf_drv_options_migrate">nrfx_spim driver API</a>.</span></p> <p><span>Best regards,<br />Jørgen</span></p><div style="clear:both;"></div>