nuttx/Documentation/platforms/arm/rp2040/boards/raspberrypi-pico/index.rst

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===============================
Raspberry Pi Pico
===============================
The `Raspberry Pi Pico <https://www.raspberrypi.com/products/raspberry-pi-pico/>`_ is a general purpose board supplied by
the Raspberry Pi Foundation.
.. figure:: RaspberryPiPico.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
* 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 IO (PIO) state machines for custom peripheral support
Serial Console
==============
By default a serial console appears on pins 1 (TX GPIO0) and pin 2
(RX GPIO1). This console runs a 115200-8N1.
The board can be configured to use the USB connection as the serial console.
Buttons and LEDs
================
User LED controlled by GPIO25.
A BOOTSEL button, which if held down when power is first
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applied to the board, will cause the RP2040 to boot into programming
mode and appear as a storage device to a computer connected via USB .
Saving a .UF2 file to this device will replace the Flash ROM contents
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on the RP2040.
Pin Mapping
===========
Pads numbered anticlockwise from USB connector.
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===== ========== ==========
Pad Signal Notes
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===== ========== ==========
1 GPIO0 Default TX for UART0 serial console
2 GPIO1 Default RX for UART1 serial console
3 Ground
4 GPIO2
5 GPIO3
6 GPIO4
7 GPIO5
8 Ground
9 GPIO6
10 GPIO7
11 GPIO8
12 GPIO9
13 Ground
14 GPIO10
15 GPIO11
16 GPIO12
17 GPIO13
18 Ground
19 GPIO14
20 GPIO15
21 GPIO16
22 GPIO17
23 Ground
24 GPIO18
25 GPIO19
26 GPIO20
27 GPIO21
28 Ground
29 GPIO22
30 Run
31 GPIO26 ADC0
32 GPIO27 ADC1
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33 AGND Analog Ground
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34 GPIO28 ADC2
35 ADC_VREF
36 3V3 Power output to peripherals
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37 3V3_EN Pull to ground to turn off.
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38 Ground
39 VSYS +5V Supply to board
40 VBUS Connected to USB +5V
===== ========== ==========
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Other RP2040 Pins
=================
GPIO23 Output - Power supply control.
GPIO24 Input - High if USB port or Pad 40 supplying power.
GPIO25 Output - On board LED.
ADC3 Input - Analog voltage equal to one third of VSys voltage.
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Separate pins for the Serial Debug Port (SDB) are available
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Power Supply
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============
The Raspberry Pi Pico can be powered via the USB connector,
or by supplying +5V to pin 39. The board had a diode that prevents
power from pin 39 from flowing back to the USB socket, although
the socket can be power via pin 30.
The Raspberry Pi Pico chip run on 3.3 volts. This is supplied
by an onboard voltage regulator. This regulator can be disabled
by pulling pin 37 to ground.
The regulator can run in two modes. By default the regulator runs
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in PFM mode which provides the best efficiency, but may be
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switched to PWM mode for improved ripple by outputting a one
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on GPIO23.
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Configurations
==============
audiopack
---------
NuttShell configuration (console enabled in UART0, at 115200 bps) with
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support for NXPlayer audio player.
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bmp280
------
NuttShell configuration (console enabled in USB Port, at 115200 bps) with support for Bosch BMP280 sensor:
.. code-block:: console
nsh> bmp280
Absolute pressure [hPa] = 1008.460022
Temperature [C] = 21.809999
nsh>
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composite
---------
NuttShell configuration (console enabled in UART0, at 115200 bps) with support for
CDC/ACM with MSC USB composite driver.
displaypack
-----------
NuttShell configuration (console enabled in USB Port, at 115200 bps) supporting
ST7789 video display.
enc28j60
--------
NuttShell configuration (console enabled in UART0, at 115200 bps) with support for
NC28J60.
lcd1602
-------
NuttShell configuration (console enabled in UART0, at 115200 bps) with support for
LCD1602.
nsh
---
Basic NuttShell configuration (console enabled in UART0, at 115200 bps).
nsh-flash
---------
Basic NuttShell configuration (console enabled in UART0, at 115200 bps
with SMART flash filesystem.
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nshsram
-------
NuttShell configuration (console enabled in UART0, at 115200 bps) with interrupt
vectors in RAM.
smp
---
Basic NuttShell configuration (console enabled in UART0, at 115200 bps) with
both ARM cores enabled.
spisd
-----
NuttShell configuration (console enabled in UART0, at 115200 bps) with SPI configured.
ssd1306
-------
NuttShell configuration (console enabled in UART0, at 115200 bps) with support for
ssd1306.
st7735
------
NuttShell configuration (console enabled in UART0, at 115200 bps) with support for
st7735.
usbmsc
------
NuttShell configuration (console enabled in UART0, at 115200 bps) with support for
usbmsc.
usbnsh
------
Basic NuttShell configuration (console enabled in USB Port, at 115200 bps).
waveshare-lcd-1.14
------------------
NuttShell configuration (console enabled in UART0, at 115200 bps) with support for
st7789.
waveshare-lcd-1.3
-----------------
NuttShell configuration (console enabled in UART0, at 115200 bps) with support for
usbmsc.
README.txt
==========
.. include:: README.txt
:literal: