Wireless & Bluetooth Support

[Gadgetoid]

This branch builds MicroPython against master with a combination of our PSRAM patches and the upcoming changes to the wireless driver in micropython/micropython#16057

Somewhat at our request, and because we threw a wireless module out into the world, the cyw43 driver has undergone some changes for more readily customised pins, and the MicroPython bindings for the driver now include the ability to specify pins at runtime.

Configuring pins is accomplished by passing them to network.WLAN like so:

wlan = network.WLAN(network.STA_IF, pin_on=6, pin_out=8, pin_in=8, pin_wake=8, pin_clock=9, pin_cs=7, div=3)

For example with an RM2 connected to the SP/CE connector on Pico Plus 2 (non wireless) you would use:

wlan = network.WLAN(network.STA_IF, pin_on=32, pin_out=35, pin_in=35, pin_wake=35, pin_clock=34, pin_cs=33)

This replaces our wireless.wlan_set_pins hack and removes wlan_set_pio_clock_divisor (which is of debatable utility anyway).

Simple LTE bringup:

import gc
import lte
import time
import requests
con = lte.LTE(YOUR_CARRIER_APN_GOES_HERE)
con.start_ppp()

try:
    t_start = time.time()
    for x in range(2):
        gc.collect()
        print(gc.mem_free())
        irq_count = 0
        req= requests.get("https://shop.pimoroni.com/robots.txt")
        print(req)

finally:
    t_end = time.time()

    print(f"Took: {t_end - t_start} seconds")

    print("Disconnecting...")
    con.stop_ppp()
    print("Done!")