Discovery kit for STM32F401 line
Sepcifications
3x USARTs running at up to 10.5 Mbit/s,
4x SPI running at up to 42 Mbit/s,
3x I²C,
1x SDIO,
1x USB 2.0 OTG full speed
2x full duplex I²S up to up to 32-bit/192KHz
12-bit ADC reaching 2.4 MSPS
10 timers, 16- and 32-bit, running at up to 84 MHz