Problem loading Mcrisp-Stellaris pico with tools UF2

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Problem loading Mcrisp-Stellaris pico with tools UF2

Forum: General Discussion

Creator: John Knott

Created: 2026-01-22

Updated: 2026-01-22

John Knott - 2026-01-22

All attempts to load fail with Tx pin(2) stuck at 0 Volts.
I have downloaded tar file on both Windows10 and Linux Mint machines.
Both machines produce UF2 files of same size
I have used multiple proven Picos and USB cables without success.
Please help as I really want to get back into forth, it is many years since I wrote
a Forth79 application to control an experimental UK military radar experiment.

John Knott

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- Matthias Koch - 2026-01-22
  
  Hi John,
  
  pin 2 should be the RX pin on the Pi Pico, and when unconnected, its ok for it to be stuck as it is not driven. Try swapping RX and TX wires! Thats one of the most common problems to encounter at the beginning. The pins are current-limited these days and survive being swapped.
  
  Matthias
  
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John Knott - 2026-01-22

Thank you Fantastic support, will have fin tomorrow.
Topic closed John

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