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Hi @xuxuck so Your SD card needs time to power up after insertion. RTT debugging adds this time.The 500ms delay works because it gives the card enough time to initialize properly, when you remove the delay, you’re trying to talk to the card too soon.
Yes, this is the main reason I have added the delay in the first place. Unexpectedly though, without RTT it only works if there is NO delay. As soon as I introduce a delay there, say 100ms, 500ms or 5000ms, I only get 0x00 from the bus. With RTT attached, the delay does not matter.
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