`f411`

Support crate for the STM32F411E-DISCO.

Based heavily on japaric/f3

Board Features

STM32F411VET6 microcontroller (Cortex-M4F) featuring 512 KiB of Flash memory
LQFP100 128 KiB of RAM
L3GD20: ST MEMS motion sensor 3-axis digital output gyroscope
LSM303DLHC: ST MEMS system-in-package featuring a 3D digital linear acceleration sensor and a 3D digital magnetic sensor
MP45DT02: ST MEMS audio sensor, omnidirectional digital microphone
CS43L22: audio DAC with integrated class D speaker driver
8 LEDs:
- LD1 red/green - USB communication
- LD2 red - 3.3V power on
- 4 user LEDs
  - LD3:PD13 Orange / North
  - LD5:PD14 Red / East
  - LD6:PD15 Blue / South
  - LD4:PD12 Green / West
- 2 USB OTG LEDs
  - LD7:PA9 green - VBus
  - LD8:PD5 red - over-current
2 buttons (user and reset)
USB OTG with micro-AB connector
ST-LINK/V2
Board power supply: through USB bus or from an external 5V supply voltage
External application power supply: 3V and 5V