STM32 NUCLEO-F446RE development board with STM32F446RE, supports Arduino and ST morpho connectivity

https://developer.mbed.org/platforms/ST-Nucleo-F446RE/

https://github.com/RIOT-OS/RIOT/wiki/Porting-Guide

Microcontroller features

• STM32F446RET6 in LQFP64 package
• ARM®32-bit Cortex®-M4 CPU with FPU
• Adaptive real-time accelerator (ART Accelerator™) allowing 0-wait state execution from Flash memory
• 180 MHz max CPU frequency
• VDD from 1.7 V to 3.6 V
• 512 KB Flash
• 128 KB SRAM System
• 4 KB SRAM Backup
• Timers General Purpose (10)
• Timers Advanced-Control (2)
• Timers Basic (2)
• SPI (4)
• I2S (2)
• USART (4)
• UART (2)
• USB OTG Full Speed and High Speed
• CAN (2)
• SAI (2)
• SPDIF-Rx (1)
• HDMI-CEC (1)
• Quad SPI (1)
• Camera Interface
• GPIO (50) with external interrupt capability
• 12-bit ADC (3) with 16 channels
• 12-bit DAC with 2 channels

Nucleo features

• Two types of extension resources
  • Arduino Uno Revision 3 connectivity
  • STMicroelectronics Morpho extension pin headers for full access to all STM32 I/Os
• On-board ST-LINK/V2-1 debugger/programmer with SWD connector
  • Selection-mode switch to use the kit as a standalone ST-LINK/V2-1
• Flexible board power supply
  • USB VBUS or external source (3.3 V, 5 V, 7 - 12 V)
  • Power management access point
• User LED (LD2)
• Two push buttons: USER and RESET
• USB re-enumeration capability: three different interfaces supported on USB
  • Virtual Com port
  • Mass storage (USB Disk drive) for drag'n'drop programming
  • Debug port