MicroPython the availability of its new Pyboard D-series with STM32F722 and WiFi/BT, reference : PYBD-SF2-W4F2. Offering a compact powerful and low-power microcontroller capable of running MicroPython scripts. The pyboard also provides native USB connectivity. Offering direct and convenient access to the software running on the board. Connect it to your PC over USB, giving you a USB flash drive to save Python scripts and data files, and a serial Python prompt for instant programming. Ways to control the pyboard include :
– REPL: Connecting to your PC via USB, the board appears as a USB virtual comms port (CDC VCP) and you can use any serial program to connect and get a Python REPL prompt. This allows you to instantly type and execute Python commands, just like you would when running Python on your PC. You can also redirect the REPL to any of the UARTs on the pyboard.
– Remote script: You can change from REPL to raw REPL mode by sending ctrl-A, and then in raw REPL mode you can send an arbitrary Python script to the board for it to execute immediately. A Python script is available which makes using this mode very simple: you just run python pyboard.py script_to_run.py and this will execute script_to_run.py on the pyboard, returning any output.
– From file: The pyboard has a small, built-in filesystem which lives in external flash memory. It also has an SD card slot if you want to extend the available storage. When you connect the pyboard to your PC, it appears as a USB flash storage device and you can access (mount) the internal filesystem and the SD card this way. If you copy a Python script to the filesystem and call it main.py then the board will execute this script when it starts up. This way you can run scripts without being connected to a PC. Scripts can also be pre-compiled to Python bytecode (so-called .mpy files) to enable faster loading at runtime.
– Via frozen code: Once an application has been developed it can be pre-compiled and frozen into the main firmware. This gives minimal overhead for RAM usage and start-up time. This is an advanced feature and requires you to recompile the C-based firmware.
Specifications and features of the board include :
– STM32F722IEK microcontroller
– 216 MHz Cortex M7 CPU with single-precision hardware floating point
– 512KiB internal flash ROM and 256KiB internal RAM
– 2MiB external QSPI flash with execute capabilities to extend internal flash
– Additional 2MiB external QSPI flash for user filesystem and storage
– Integrated, high-performance WiFi and Bluetooth 4.1 (classic and BLE) via Murata 1DX module (with CYW4343)
– TCP/IP and Bluetooth stacks run on the main microcontroller, fully customisable
– On-board fractal chip antenna for WiFi and Bluetooth
– uFL connector for attaching external antenna, selectable via RF switch
– Micro USB connector for power and serial communication
– Micro SD card slot, supporting standard and high capacity SD cards
– Real time clock with highly accurate pre-calibrated external oscillator
– Physical electrical connectivity via 24 through holes, and a 40+40 pin mezzanine bus connector
– 46 independent GPIO, with 24 available via through holes
– Additional 11 GPIO shared with SD card, USB, USR button, BT audio
– 2x I2Cs, 4x UARTs, 3x SPIs, 1x CAN interfaces
– 3x 12-bit analog to digital converters (ADC), available on 16 independent pins
– 2x 12-bit digital to analog converters (DAC), available on 2 independent pins
– 1x 3-colour RGB LED
– 1 reset and 1 user button
– On-board 3.3V LDO voltage regulator to supply main microcontroller
– Additional, user switchable, on-board 3.3V LDO voltage regulator to power SD card and external components
– 2 mounting points
– Custom DFU bootloader for easy upgrading of firmware
For more information and full specifications jump over to the MicroPython online store by following the link.
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