https://devzone.nordicsemi.com/f/nordic-q-a/111017/broken-images-from-nrf52-ble-image-transfer-demoI have built a BLE image transfer demo between iPhone 15 and nrf52840 using the following two code: https://github.com/NordicPlayground/nrf52-ble-image-transfer-demo https://github.com/NordicPlayground/iOS-Image-Transfer-Demo/tree/master?tab=readmeen-USTelligent Community 13Fri, 10 May 2024 13:38:22 GMThttps://devzone.nordicsemi.com/thread/482826?ContentTypeID=1Fri, 10 May 2024 13:38:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3433a117-6372-4b8e-86bb-3568f017ec7aHieu<p>Hi Kirak,</p> <p>In main.c of the BLE Image Transfer project, you will find the&nbsp;raw image data being used for sending here between <a href="https://github.com/NordicPlayground/nrf52-ble-image-transfer-demo/blob/78520797efaa71862c2597e50d343ca42f0a2dff/main.c#L856-L871">line 856 and 871</a>. You can debug the image data buffer being used there.</p> <p>Hieu</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/482607?ContentTypeID=1Wed, 08 May 2024 20:21:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:65cfb901-0a0b-4fe0-886e-8a5e753c96b1Kirak<p>I just checked CRC on both sides, and they are equal while images are still broken. My understanding is that writeWithoutResponse (write command not write request) may involve packet drops but in my case all packets arrive with correct CRC (i.e., correct order) so I suspect the image from NRF board itself is broken before transmission. Is there a way to debug image from the board, e.g., directly get image from board to laptop over USB?</p><div style="clear:both;"></div>