Raspberry Pico Intro

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Raspberry Pi Pico

a microcontroller development board,

  • RP2040

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    > new microcontroller chip designed by Raspberry Pi in the UK.
      - dual-core Arm Cortex-M0+
      - 264KB RAM
      - 16MB off-chip Flash

  • Micro USB Port

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    - provide power make Pico run
    - USB port talk to pico

  • BOOTSEL

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    - BOOTSEL is short for boot selection.

Raspberry Pico’s pins

The Raspberry Pi Pico's pins

  • Raspberry Pi Pico pins functions

    … … …
    3V3 3.3 volts power Pico 3.3V 从 VSYS 获取
    VSYS ~2-5 volts power 连接Pico内部电源
    VBUS 5 volts power 5V power taken from Pico’s micro USB port
    GND 0 volts ground 地
    GPxx General-purpose input/output pin 通用GPIO口
    GPxx_ADCx GPIO/ADC input 普通GPIO口或ADC输入口
    ADC_VREF Analogue-to-digital coverter (ADC) voltage reference 模拟数字转换参考电压输入
    AGND Anaglogue-to-digital coverter (ADC) 0 volts ground ADC输入电压参考0volts
    RUN Enable/disable Pico 启动/关闭Pico

  • MicroPython - Hello, LED!

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    import machine
    import utime

    # on-board LED is connected to one of RP2040's general-purpose input/output pins. GP25.
    led_onboard = machine.Pin(25, machine.Pin.OUT)

    while True:
        led_onboard.toggle()
        utime.sleep(1)

MicroPython on Raspberry Pi Pico

  • Installing MicroPython

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    > MicroPython is a full implementation of the Python 3 Programming language that runs directly on embedded hardware like Raspberry Pi Pico.
    # Hold BOOTSEL button down 3 seconds then let go
      /Volumes/RPI-RP2
      ➜ tree
      .
      ├── INDEX.HTM
      └── INFO_UF2.TXT  -- hold information about your Pico

      0 directories, 2 files

    # Darg-and-Drop MicroPython
      - Drag and drop the MicroPython UF2 onto the RPI-RP2 volume, auto flash the firmware onto its internal storage.

  • Programming with MicroPython

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    > MicroPython is a Python-compatible programming language developed specifically for microcontrollers.

    # Thonny - IDE
    MicroPython v1.17 on 2021-09-02; Raspberry Pi Pico with RP2040
    Type "help()" for more information.
    >>> print("Hello, World!")
    Hello, World!
    >>>

Rust on Raspberry Pi Pico

Getting Started with FreeRTOS on the Raspberry Pi Pico

RTOS - Real Time Operating System

Allows multiple tasks to execute “at the same time”
Schedules based on task priority
“Task Priority” allows the programmer to define what needs to happen first