NUCLEO-F411RE

The NUCLEO-F411RE development board uses the STM32F411RE as the target processor.
This board is a rock solid development board with on-board ST-Link loader / debugger, using an STM32F103CBT6.

This development board functions well in at least three development environments:
1) Arduino & Arduino IDE using the STM32 processor plug-in
2) MBed - The on-board STM32 loader / debugger supports loading web site created binaries
    See https://os.mbed.com/
3) STMicro's STM32CubeMX / Keil uVision or STMicro's new STM32CubeIDE
    See https://www.st.com/en/development-tools/stm32cubeide.html
I prefer STMicro's environment, allowing me easy access to peripherals, registers,
  and clock systems, with full access to every part of this system on chip.

Processor: STM32F411RE
512KB Flash
128KB SRAM
100MHz CPU clock
Single-cycle multiplication and hardware division
1.7 to 3.6 V application supply and I/Os
Within this part series, this is considered a "Medium-density device",
  and as such, has the following peripherals:
3 USARTs
6 general purpose 16-bit timers
2 general purpose 32-bit timers
1 SysTick timer
5 SPI/I2S, 3 I2C
1 RTC: sub-second accuracy, hardware calendar
4 PWM
1 SDIO interface (SD/MMC/eMMC)
1 USB 2.0 full-speed device/host/OTG controller with on-chip PHY
1 12-bit, 2.4 MSPS A/D converter: up to 16 channels
1 CRC calculation unit
FPU, single precision
DSP instructions

Hardware

• Green LED, LD2, connected to PA5, illuminates when driven high
• Blue PushButton, B1, connects to PC13, grounding the signal when pressed
• 32,768Hz crystal oscillator, LSE, used for Real Time Clock (RTC)
• 8MHz HSE, is provided by the 8MHz crystal oscillator from the attached ST-Link, into PD0
• UART2 connects the target processor to the ST-Link, providing a USB COM port connection on the host computer. Uses PA2 for TX, and PA3 for RX.
• ST-Link connects to TCK (PA14), TMS (PA13)

Firmware
https://www.st.com/en/evaluation-tools/nucleo-f411re.html
https://www.st.com/en/embedded-software/stm32cubef4.html

ST Website for the STM32F4 family: https://www.st.com/en/microcontrollers-microprocessors/stm32f4-series.html