We've also chosen this chip for our first BLE-friendly CircuitPython board!

CircuitPython works best with disk drive access, and this is the only BLE-plus-

USB-native chip that has the memory to handle running a the little Python

interpreter. The massive RAM and speedy Cortex M4F chip makes this a good

match.

Please note at this time we only have BLE stack support in Arduino.

CircuitPython BLE stack support is still a work-in-progress!

It's got tons of awesome peripherals: plenty of GPIO, analog inputs, PWM,

timers, etc. Best of all, it's got that native USB! Finally, no need for a separate

USB serial chip like CP2104 or FT232. Serial is handled as a USB CDC descriptor,

and the chip can act like a keyboard, mouse, MIDI device or even disk drive.

(Note that we don't have support for anything but CDC for Arduino at this time)

Some other upgrades we've tossed in are an extra 'USER' switch that could be

used to trigger OTA updates (or whatever you choose), a NeoPixel LED for status

updates, 2 MB of QSPI Flash for storing CircuitPython files, and a SWD

connector.

We have quite a few BTLE-capable Feathers (it's a popular protocol!) so check

out our BT Feather guide for some comparison information.

We pre-programed the chip with our UF2 bootloader, which can use either

commandline UART programming with nrfutil (we use this for Arduino) or drag-

n-drop mass storage, for CircuitPython installation and also because mass-

storage-drive bootloaders make updating firmware so easy. Want to program

the chip directly? You can use our command line tools with your favorite editor

and toolchain. If you want to use an SWD programmer/debugger (for even more

advanced usage), we have a standard 2x5 0.05" connector.

Best of all, we've done all the heavy lifting of getting the low level BLE stack into

shape so you can focus on your project from day one! The example code works

great with our existing iOS and Android app.

Features:



ARM Cortex M4F (with HW floating point acceleration) running at 64MHz



1MB flash and 256KB SRAM



Native Open Source USB stack - pre-programmed with UF2 bootloader