RaspberryPi rp2040

chip:rp2040

The rp2040 is a dual core chip produced by the RaspberryPi Foundation that is based on ARM Cortex-M0+.

Peripheral Support

The following list indicates peripherals currently supported in NuttX:

Peripheral Notes

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GPIO See Supported Boards documentation for available pins. UART I2C SPI DMAC PWM USB GPIO 0 (UART0 TX) and GPIO 1 (UART0 RX) are used for the console. PIO IRQs DMA Clock Output RP2040 Programmable I/O ws2812 Flash ROM Boot Smart pixels (e.g. Neopixel) SRAM Boot If Pico SDK is available a nuttx.uf2 file will be created BMP180 Requires I2C0 INA219 Requires I2C0

The Pico Display Pack (ST7789 LCD) and Pico Audio Pack (PCM5100A I2S DAC) are also available.

Installation

1. Download Raspberry Pi Pico SDK:

   git clone -b 2.0.0 https://github.com/raspberrypi/pico-sdk.git

2. Set PICO_SDK_PATH environment variable:

   export PICO_SDK_PATH=<absolute_path_to_pico-sdk_directory>
   

3. Download NuttX and the companion applications. These must both be contained in the same directory:

   git clone https://github.com/apache/nuttx.git nuttx
   git clone https://github.com/apache/nuttx-apps.git apps
   

Building NuttX

1. Change to NuttX directory:

   cd nuttx
   

2. Select a configuration. The available configurations can be listed with the command:

   ./tools/configure.sh -L
   

3. Load the selected configuration.:

   make distclean
   ./tools/configure.sh <selected_configuration>
   

4. Modify the configuration as needed (optional):

   make menuconfig
   

5. Build NuttX:

   make
   

Programming

Programming using BOOTSEL

Connect board to USB port while pressing BOOTSEL. The board will be detected as USB Mass Storage Device. Then copy "nuttx.uf2" into the device. (Same manner as the standard Pico SDK applications installation.)

Programming using SDB

Most (but no all) RP2040 boards provide a serial (SDB) debug port. The "nuttx" ELF file can be uploaded with an appropriate SDB programmer module and companion software.

Running NuttX

Most builds provide access to the console via UART0. To access this GPIO 0 and 1 pins must be connected to the device such as USB-serial converter.

The [usbnsh]{.title-ref} configuration provides the console access by USB CDC/ACM serial devcice. The console is available by using a terminal software on the USB host.

Supported Boards

boards//