Arduino-Pico

This is the documentation for the Raspberry Pi Pico Arduino core, Arduino-Pico. Arduino-Pico is a community port of the RP2040 (Raspberry Pi Pico processor) to the Arduino ecosystem, intended to make it easier and more fun to use and program the Raspberry Pi Pico / RP2040 based boards.

This Arduino core uses a custom toolset with GCC 10.3 and Newlib 4.0.0 and doesn’t require any system-installed prerequisites.

For the latest version, always check https://github.com/earlephilhower/arduino-pico

Contents:

• Getting Help
• Contributing
  • Contributing to the Core (Pull Requests)
  • Adding a New Board
  • Porting Libraries and Applications to the Core
• Installation
  • Installing via Arduino Boards Manager
  • Installing via GIT
  • Installing both Arduino and CMake
  • Uploading Sketches
  • Uploading the First Sketch
  • Windows 7 Driver Notes
  • Windows 7 Installation Problems
  • Uploading Filesystem Images
  • Uploading Sketches with Picotool
  • Uploading Sketches with Picoprobe
  • Uploading Sketches with pico-debug
  • Debugging with Picoprobe/pico-debug, OpenOCD, and GDB
• IDE Menus
  • Model
  • Flash Size
  • CPU Speed
  • Debug Port and Debug Level
  • Generic RP2040 Support
  • Boot Stage 2 Options for Generic RP2040
• Platform.IO Integration
  • What is PlatformIO?
  • Important steps for Windows users, before installing
  • Current state of development
  • Deprecation warnings
  • Selecting the new core
  • Flash size
  • CPU Speed
  • Debug Port
  • Debug Level
  • C++ Exceptions
  • Stack Protector
  • RTTI
  • USB Stack
  • IP Stack
  • Selecting a different core version
  • Examples
  • Debugging
  • Filesystem Uploading
• Pin (Re)Assignment
  • I2S
  • Serial1 (UART0), Serial2 (UART1)
  • SPI (SPI0), SPI1 (SPI1)
  • Wire (I2C0), Wire1 (I2C1)
• RP2040 Helper
  • Core Internals
  • Hardware Watchdog
  • Memory Information
  • Hardware Identification
  • Bootloader
• Analog I/O
  • Analog Input
  • Analog Outputs
  • Analog Output Restrictions
• Digital I/O
  • Board-Specific Pins
  • Input Modes
  • Output Modes (Pad Strength)
  • Tone/noTone
• EEPROM
  • EEPROM Class API
  • EEPROM Examples
• I2S Audio
  • I2S Class API
  • Sample Writing/Reading API
  • Note About 24-bit Samples
• PWM Audio
  • PWM Class API
• Microphone (and Analog Sensor) Input
  • ADC Input API
• Serial USB and UARTs
• “SoftwareSerial” PIO-based UART
• SoftwareSerial Emulation
• Servo
• SPI
• Wire(I2C)
• File Systems (SD, SDFS, LittleFS)
  • Flash Layout
  • Compatible Filesystem APIs
  • LittleFS File System Limitations
  • Uploading Files to the LittleFS File System
  • SD Library Information
  • Using Second SPI port for SD
  • File system object (LittleFS/SD/SDFS)
  • Filesystem information structure
  • Directory object (Dir)
  • File object
• USB (Arduino and Adafruit_TinyUSB)
  • Pico SDK USB Support
  • Adafruit TinyUSB Arduino Support
  • Adafruit TinyUSB Configuration and Quirks
• Multicore Processing
  • Pausing Cores
  • Communicating Between Cores
• Bluetooth (Alpha/Beta)
  • Enabling Bluetooth
  • Included Bluetooth Libraries
  • Writing Custom Bluetooth Applications
• Single File USB Drive
  • Callbacks, Interrupt Safety, and File Operations
  • Using SingleFileDrive
• FreeRTOS SMP (multicore)
  • Enabling FreeRTOS
  • Configuration and Predefined Tasks
  • Caveats
  • More Information
• WiFi (Pico-W Support)
  • Supported Features
  • Important Information
  • Special Thanks
• WiFiClient
  • flush and stop
  • setNoDelay
  • getNoDelay
  • setSync
  • getSync
  • setDefaultNoDelay and setDefaultSync
  • getDefaultNoDelay and getDefaultSync
  • Other Function Calls
• WiFiServer
  • accept
  • available
  • write (write to all clients) not supported
  • setNoDelay
  • Other Function Calls
• WiFiUDP
• NTP client
  • bool NTP.waitSet(uint32_t timeout)
  • bool NTP.waitSet(void (*cb)(), uint32_t timeout)
• BearSSL Encrypted TLS
  • CPU Requirements
  • Memory Requirements
  • Object Lifetimes
  • TLS and HTTPS Basics
  • Public and Private Keys
  • TLS Sessions
  • X.509 Certificate(s)
  • Certificate Stores
  • Supported Crypto
• WiFiClientSecure Class
  • Validating X509 Certificates (Am I talking to the server I think I’m talking to?)
  • Client Certificates (Proving I’m who I say I am to the server)
  • MFLN or Maximum Fragment Length Negotiation (Saving RAM)
  • Sessions (Resuming connections fast)
  • Errors
  • Limiting Ciphers (New connections faster)
  • Limiting TLS(SSL) Versions
• ESP32 Compatibility
• WiFiServerSecure (TLS/SSL/HTTPS)
  • setBufferSizes(int recv, int xmit)
  • Setting Server Certificates
  • Client sessions (Resuming connections fast)
  • Requiring Client Certificates
• HTTP/HTTPS Client
• Over-the-Air (OTA) Updates
  • Introduction
  • Compression
  • Uploading from the Arduino IDE
  • Password Protection
  • Web Browser
  • HTTP Server
  • Stream Interface
• Ported/Optimized Libraries
• Using Pico-SDK
  • Included SDK
  • Multicore (CORE1) Processing
  • PIOASM (Compiling for the PIO processors)
• Licenses