mpy-cross configuration for RP2350?

[SteKme]

Hi,

please does MPY cross compiler already support RP2350? Is there a way to generate valid MPY files for 2350?

For RP2040, the architecture switch is '-march=armv6m', however RP2350 ?probably? is Armv8-M - and at least at this moment, the page
https://pypi.org/project/mpy-cross/#description
doesn't list this architecture in 'mpy-cross options' section.

Thanks so much,
Stepan

[peterhinch]

Have you tried armv7m?

[SteKme]

apologies @peterhinch for me not being able to read between lines :-)

does it mean that armv7m is THE suggested and correct setting -- or You believe it might work (but not certain about it)?

According to e.g.
https://medium.com/@wassimdhokkar/arm-architecture-what-are-the-differences-between-armv7-and-armv8-arm-architectures-9a80cea35596
it appears v8 has extra features that, indeed, might not be related to MPY bytecode. Of course, I'd better avoid unexpected quirks caused by a wrong architecture MPY, I already have full hands of rather complicated issues anyway.

Best,
Stepan

[peterhinch]

I think it's worth a try. Pyboards support the Arm Thumb V7 instruction set. V8 is presumably a superset of V7 but I'm not aware of the MP compiler emitting any V8 opcodes.

I have done a brief test. In this demo I added the native decorator as follows. The function was chosen for being reasonably involved and using FP maths.

@micropython.native
async def aclock(dial, lbldate, lbltim):
    # Return a unit vector of phase phi. Multiplying by this will
    # rotate a vector anticlockwise which is mathematically correct.
    # Alas clocks, modelled on sundials, were invented in the northern
    # hemisphere. Otherwise they would have rotated widdershins like
    # the maths. Hence negative sign when called.
    def uv(phi):
        return rect(1, phi)

    def suffix(n):
        if n in (1, 21, 31):
            return "st"
        if n in (2, 22):
            return "nd"
        if n in (3, 23):
            return "rd"
        return "th"

    days = ("Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun")
    months = ("Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec")

    hrs = Pointer(dial)
    mins = Pointer(dial)
    secs = Pointer(dial)

    hstart = 0 + 0.7j  # Pointer lengths. Will rotate relative to top.
    mstart = 0 + 1j
    sstart = 0 + 1j

    while True:
        t = time.localtime()
        hrs.value(hstart * uv(-t[3] * pi / 6 - t[4] * pi / 360), CYAN)
        mins.value(mstart * uv(-t[4] * pi / 30), CYAN)
        secs.value(sstart * uv(-t[5] * pi / 30), RED)
        lbltim.value("{:02d}.{:02d}.{:02d}".format(t[3], t[4], t[5]))
        lbldate.value(
            "{} {}{} {} {}".format(days[t[6]], t[2], suffix(t[2]), months[t[1] - 1], t[0])
        )
        await asyncio.sleep(1)

I compiled the file using march=armv7m, renamed the .py file, and the demo ran correctly. Hardware was a Pico 2.

[SteKme]

thank You, Peter, for Your help!