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rp2: Add HSTX ALT function. - #18458

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sparkfun:rp2_pins_af0
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rp2: Add HSTX ALT function.#18458
sfe-SparkFro wants to merge 1 commit into
micropython:masterfrom
sparkfun:rp2_pins_af0

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@sfe-SparkFro

@sfe-SparkFro sfe-SparkFro commented Nov 21, 2025

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Summary

Follow up from #17692. Adds the HSTX alternate pin function for GPIO12-19 on the RP2350.

Testing

Tested with an RP2350B board, and seems to work fine!

>>> machine.Pin(12, mode=machine.Pin.ALT, alt=machine.Pin.ALT_HSTX)
Pin(GPIO12, mode=ALT, alt=HSTX)

@sfe-SparkFro sfe-SparkFro mentioned this pull request Nov 21, 2025
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github-actions Bot commented Nov 21, 2025 •
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Code size report:

Reference:  shared/runtime/pyexec: Set PYEXEC_FORCED_EXIT flag for SystemExit. [a686410]
Comparison: rp2: Add HSTX ALT function. [merge of 7a554db]
  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
     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

@sfe-SparkFro
rp2: Add HSTX ALT function.
7a554db 
Follow up from micropython#17692.

Signed-off-by: Dryw Wade <[email protected]>
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sfe-SparkFro commented Nov 21, 2025 •
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Forgot that af_idx is now increased by one, affecting this spot too, fixed with 7a554db!

@sfe-SparkFro sfe-SparkFro mentioned this pull request Nov 21, 2025
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dpgeorge
dpgeorge approved these changes Nov 23, 2025
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Thanks, this looks good.

I tested on a RPI_PICO2_W, and the HSTX function could be selected correctly. And other existing alt functions seemed to be correct.

I also tested building RPI_PICO and found that the firmware is unchanged with this PR, which is as expected (binary equivalent except for the changing git hash that's embedded in the firmware).

@dpgeorge dpgeorge added this to the release-1.27.0 milestone Nov 23, 2025
sfe-SparkFro added a commit to sparkfun/red_vision that referenced this pull request Nov 24, 2025
@sfe-SparkFro
Set HSTX pin mode with Pin.ALT_HSTX
e12c3b0 
In anticipation of micropython/micropython#18458,
which is slated for the v1.27.0 release.
@dpgeorge

dpgeorge commented Dec 1, 2025

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Rebased and merged in 1ef76c7

@dpgeorge dpgeorge closed this Dec 1, 2025
@sfe-SparkFro
sfe-SparkFro deleted the rp2_pins_af0 branch December 1, 2025 16:50
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