https://devzone.nordicsemi.com/f/nordic-q-a/14147/spi-dma-transfer-fails-for-large-bufferHI All, We are using NRF52, S132 Softdevice , SDK 11.0.0. In SPI DMA transfer, when we try to increase size of the m_tx_data greater than 254 bytes, it failed. It is working when the size is less than or equal to 254 bytes. Cant we send more thanen-USTelligent Community 13Mon, 30 May 2016 04:32:06 GMThttps://devzone.nordicsemi.com/thread/54069?ContentTypeID=1Mon, 30 May 2016 04:32:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d45f1588-8d10-4587-b1d9-25cabd4fee13Thangaraj<p>Thanks for ur support RK</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/54068?ContentTypeID=1Mon, 30 May 2016 04:10:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1778cd6d-7db9-49e6-a3b2-e00159014219RK<p>No of course you can&#39;t, well you can change it to uint32_t if you like but since the DMA register is 8 bits wide, 255 bytes is the maximum transfer you can do with DMA so it&#39;s not going to help you. The register definition etc is all in the product spec. DMA size register is 8bit for all the nRF52 peripherals.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/54067?ContentTypeID=1Mon, 30 May 2016 04:03:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2a87bd73-2648-4732-81c9-5e75dfb46c0fThangaraj<p>Is that possible if we change it to uint32?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/54066?ContentTypeID=1Fri, 27 May 2016 15:37:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:54ed23a1-0e76-449b-a035-8b302abc1865RK<p>No you can&#39;t - the size is a uint8, so limited to 255</p><div style="clear:both;"></div>