CircuitPython SPITarget pin finder

spit.py

# SPITarget pin finder
# e.g., SPITarget(sck=board.D12, mosi=board.D13, miso=board.D11, ss=board.D10)
# modified from an old SPI pin finder, probably _somewhere_ in the Adafruit docs

import board
import busio
from microcontroller import Pin
from spitarget import SPITarget


def is_hardware_spit(clk, mosi, miso, ss):
    try:
        p = SPITarget(sck=clk, mosi=mosi, miso=miso, ss=ss)
        p.deinit()
        return True
    except ValueError:
        return False

def get_unique_pins():
    exclude = ['NEOPIXEL', 'APA102_MOSI', 'APA102_SCK']
    pins = [pin for pin in [
        getattr(board, p) for p in dir(board) if p not in exclude]
            if isinstance(pin, Pin)]
    unique = []
    for p in pins:
        if p not in unique:
            unique.append(p)
    return unique


pins = get_unique_pins()
for clk_pin in pins:
    for mosi_pin in pins:
        for miso_pin in pins:
            for ss_pin in pins:
                pin_set = {clk_pin, mosi_pin, miso_pin, ss_pin}  # set()
                if len(pin_set) < 4:
                    continue
                if is_hardware_spit(clk_pin, mosi_pin, miso_pin, ss_pin):
                    print(f"sck={clk_pin}, mosi={mosi_pin}, miso={miso_pin}, ss={ss_pin}")