https://devzone.nordicsemi.com/f/nordic-q-a/99443/spi-with-ble-stackI am developing some code that involves multiple peripherals, but I am having issues only with the SPI lines following initializing the BLE stack. I am able to write to and from a FRAM chip before the BLE stack is initialized and see data flowing on myen-USTelligent Community 13Tue, 09 May 2023 05:35:48 GMThttps://devzone.nordicsemi.com/thread/424402?ContentTypeID=1Tue, 09 May 2023 05:35:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:930a6c2b-ebc0-451f-a010-29f55864955fSusheel Nuguru<p>It could be, Did not hear about this on our nRF52 DK.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/424340?ContentTypeID=1Mon, 08 May 2023 14:52:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:843646b4-d6bf-40f6-a693-51783794aa6dinspiringdev123<p>I changed my code to use Pin 11 vs Pin 13 and it seems to be working now. Is this just something to do with the BMD 350 Eval Board?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/424330?ContentTypeID=1Mon, 08 May 2023 14:17:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:97243691-def0-4dff-9b9d-5c78236af39binspiringdev123<p>I have added that to the code to no avail. I am actually seeing that after the BLE stack is initialized, the chip select line is unable to be toggled anymore to the active low position.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/424217?ContentTypeID=1Mon, 08 May 2023 10:45:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cabc107b-06a1-4a44-a237-33d36726c994Susheel Nuguru<p>The only thing that I can think is that when the BLE is initialized then it takes control over the LFCLK and HFCLK. In your SPI code are you making sure to request the HFCLK XTAL before using it or is your application assuming that the HFCLK is set automatically?&nbsp;<br />After BLE is initialized make sure you call&nbsp;sd_clock_hfclk_request to make sure that the clock is kept active for SPI when softdevice is not using it.</p><div style="clear:both;"></div>