8000 Add five UARTs to NUCLEO_F746ZG and NUCLEO_F439ZI by mdaeron · Pull Request #18721 · micropython/micropython · GitHub
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Add five UARTs to NUCLEO_F746ZG and NUCLEO_F439ZI #18721

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Add five UARTs to NUCLEO_F746ZG and NUCLEO_F439ZI #18721

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@mdaeron mdaeron commented Jan 24, 2026

Summary

Some applications require more than 3-4 UART devices. On the NUCLEO_F746ZG and NUCLEO_F439ZI (the two boards that I have access to for testing purposes), adding five UART devices does not appear to interfere with other pins. This very simple commit adds the following UARTs: 1, 4, 5, 7, and 8.

Testing

I flashed a NUCLEO_F746ZG and played a bit with the UARTs. I am not sure what kind of more systematic tests are warranted. Based on the feedback I may get here, I can run more tests (on both a F746ZG and a F439ZI) on Monday.

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github-actions bot commented Jan 24, 2026 •
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Code size report:

Reference:  github: Install Python 3.11 for Windows CI runs. [f1363d8]
Comparison: stm32/boards: Add UARTs to NUCLEO F746ZG and NUCLEO F439ZI. [merge of adbdf80]
  mpy-cross:    +0 +0.000% 
   bare-arm:    +0 +0.000% 
minimal x86:    +0 +0.000% 
   unix x64:    +0 +0.000% standard
      stm32:    +0 +0.000% PYBV10
      esp32:    +0 +0.000% ESP32_GENERIC
     mimxrt:    +0 +0.000% TEENSY40
        rp2:    +0 +0.000% RPI_PICO_W
       samd:    +0 +0.000% ADAFRUIT_ITSYBITSY_M4_EXPRESS
  qemu rv32:    +0 +0.000% VIRT_RV32

@mdaeron mdaeron force-pushed the master branch 4 times, most recently from 9da32f9 to 155f917 Compare January 24, 2026 18:01
@mdaeron
stm32/boards: Add UARTs to NUCLEO F746ZG and NUCLEO F439ZI.
adbdf80 
Adds the following UARTs: 1, 4, 5, 7, 8,
assigned to pins that were not otherwise assigned.

Signed-off-by: mdaeron <mathieu@daeron.fr>
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@mdaeron @dpgeorge
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