Hello Ralph, Thank you for replay. I've written the part of the code so that it suits my needs but it seems I've made a mistake and I can't figure where. I started by switching between two antennas. I created switch loop inside for loop just as you can see below but the problem is that program seems to somehow end the first switch case too early. I'm sending two more oscilloscope screenshots. In both cases, the yellow signal is NFC reader signal but since I only have 2 channel scope I couldn't measure all three signals at the same time so on one screenshot there is GPIO pin 1 port 3 and on the other is GPIO port 1 pin 4. As you can see GPIO port 1 pin 3 goes high only for a few ms, when it really should be high every second NFC interval. GPIO port 1 pin 3 GPIO port 1 pin 4 Thank you!
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