[riot-notifications] [RIOT-OS/RIOT] boards/rpi-pico: add support (#15822)

Thomas Perrot notifications at github.com
Thu Jan 21 09:02:13 CET 2021

#### Description
Add the support for the mcu RP2040 as weel as the  Raspberry-Pi Pico board.

Raspberry Pi Pico is a low-cost, high-performance microcontroller board with flexible digital interfaces. Key features include:

    RP2040 microcontroller chip designed by Raspberry Pi in the United Kingdom
    Dual-core Arm Cortex M0+ processor, flexible clock running up to 133 MHz
    264KB of SRAM, and 2MB of on-board Flash memory
    Castellated module allows soldering direct to carrier boards
    USB 1.1 with device and host support
    Low-power sleep and dormant modes

    Drag-and-drop programming using mass storage over USB
    26 × multi-function GPIO pins
    2 × SPI, 2 × I2C, 2 × UART, 3 × 12-bit ADC, 16 × controllable PWM channels
    Accurate clock and timer on-chip
    Temperature sensor
    Accelerated floating-point libraries on-chip
    8 × Programmable I/O (PIO) state machines for custom peripheral support

### Useful links

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