=============================== Waveshare RP2040 Zero =============================== .. tags:: chip:rp2040 The `Waveshare RP2040 Zero `_ is a general purpose board supplied by Waveshare. .. figure:: WaveshareRP2040Zero.png :align: center Features ======== * RP2040 microcontroller chip * 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 Host and Device support * Low-power sleep and dormant modes * Drag & drop programming using mass storage over USB * 20 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 IO (PIO) state machines for custom peripheral support Buttons and LEDs ================ A ws2812 (NeoPixel) smart RGB LED controlled by GPIO16 (data). There is a BOOT button which if held down when power is first applied or the RESET button is pressed will cause the RP2040 to boot into program mode and appear as a storage device to a USB connecter. Saving a .UF2 file to this device will replace the Flash ROM contents on the RP2040. Pin Mapping =========== Pads numbered anticlockwise from USB connector. ===== ========== ========== Pad Signal Notes ===== ========== ========== 1 5V 2 Ground 3 3.3V 4 GPIO29 5 GPIO28 6 GPIO27 7 GPIO26 8 GPIO15 9 GPIO14 10 GPIO13 11 GPIO12 12 GPIO11 Default TX for SPI1 13 GPIO10 Default SCK for SPI1 14 GPIO9 Default CSn for SPI1 15 GPIO8 Default RX for SPI1 16 GPIO7 Default SCL for I2C1 17 GPIO6 Default SDA for I2C1 18 GPIO5 Default SCL for I2C0 19 GPIO4 Default SDA for I2C0 20 GPIO3 21 GPIO2 22 GPIO1 Default RX for UART0 serial console 23 GPIO0 Default TX for UART0 serial console ===== ========== ========== Power Supply ============ The Waveshare RP2040 Zero can be powered via the USB connector, or by supplying +5V to pin 1. The RP2040 runs on 3.3 volts. This is supplied by an onboard voltage regulator. Installation & Build ==================== For instructions on how to to install the build dependencies and create a NuttX image for this board, consult the main :doc:`RP2040 documentation <../../index>`. Configurations ============== All configurations listed below can be configured using the following command in the ``nuttx`` directory (again, consult the main :doc:`RP2040 documentation <../../index>`): .. code:: console $ ./tools/configure.sh waveshare-rp2040-zero: gpio -------- NuttShell configuration (console enabled in UART0, at 115200 bps) with GPIO examples. nsh --- Basic NuttShell configuration (console enabled in UART0, at 115200 bps). usbnsh ------ Basic NuttShell configuration using CDC/ACM serial (console enabled in USB Port, at 115200 bps). ws2812 ------ Basic NuttShell configuration with WS2812 driver and example enabled. Console is enabled over USB at 115200 bps.