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this post was submitted on 03 Oct 2023
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Raspberry Pi Pico
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right now my setup, which only the "debugger/programmer" consists one breadboard with two picos; one for the debugger and one for serial monitoring, with two USB cables. it's messy, but works, tho I shouldn't need it to be this messy.
for some reason, the RX/TX just gets pulled up high and that's it, probably by the Probe if it's on its own.
It may be caused by you didn't connect GND. So debugger and board has different ground level and it looks like RX/TX were pull up because 0V on one side is equal to a higher voltage on another side.
It was a while ago I last messed with the Pico, but if I remember correctly, they shared the same ground, but I might be wrong.
Strange thing is, if I use a different set of UART pins (UART1 or even if I define one myself) the serial logging works as it should, so it seems like only UART0 is affected by this.
So... using other TX/RX pins works, just inconvenient sometimes.
Thanks for the input!