120 lines
3.1 KiB
ReStructuredText
120 lines
3.1 KiB
ReStructuredText
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=======================
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Adafruit QT Py RP2040
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=======================
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The QT Py RP2040 is a tiny general purpose RP2040 board supplied by
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Adafruit.
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.. figure:: QT-Py.png
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:align: center
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Features
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========
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* RP2040 microcontroller chip
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* Dual-core ARM Cortex M0+ processor, flexible clock running up to 133 MHz
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* 264kB of SRAM, and 8MB of on-board Flash memory
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* Castellated module allows soldering direct to carrier boards
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* USB Host and Device support via type C connector.
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* Low-power sleep and dormant modes
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* Drag & drop programming using mass storage over USB
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* 13 multi-function GPIO pins (11 breakout pads and two QT pads)
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* 2× SPI, 2× I2C, 2× UART, 4× 12-bit ADC, 16× controllable PWM channels
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* Accurate clock and timer on-chip
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* Temperature sensor
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* Accelerated floating point libraries on-chip
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* 8 × Programmable IO (PIO) state machines for custom peripheral support
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Serial Console
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==============
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By default a serial console appears on GPIO pins 20 (RX GPIO1) and pin 5
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(TX GPIO1). This console runs a 115200-8N1.
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The board can be configured to use the USB connection as the serial console.
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Buttons and LEDs
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================
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A ws2812 (NeoPixel) smart RGB LED controlled by GPIO12 (data) and
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GPIO11 (power).
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There is a BOOT button which if held down when power is first
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applied or the RESET button is pressed will cause the RP2040 to
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boot into program mode and appear as a storage device to
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a USB connecter. Saving a .UF2 file to this device will
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replace the Flash ROM contents on the RP2040.
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A RESET button that allows rebooting the board without disconnecting
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the power.
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Pin Mapping
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===========
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Pads numbered anticlockwise from USB connector.
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===== ========== ==========
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Pad Signal Notes
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===== ========== ==========
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1 GPIO26 ADC0
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2 GPIO27 ADC1
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3 GPIO28 ADC2
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4 GPIO29 ADC3
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5 GPIO24
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6 GPIO25
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7 GPIO20 Default TX for UART1 serial console
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8 GPIO5 Default RX for UART1 serial console
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9 GPIO6
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10 GPIO4
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11 GPIO3
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12 3.3V Power out to peripherals.
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13 Ground
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14 5V
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===== ========== ==========
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The board has a STEMMA QT connector that is also connected to
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pins GPIO22 (I2C1 SDA) and GPIO23 (I2C1 SCL).
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Power Supply
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============
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The Raspberry Pi Pico can be powered via the USB connector,
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or by supplying +5V to pin 14. The board had a diode that prevents
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power from pin 14 from flowing back to the USB socket, although
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this can be disabled by connecting on-board solder pads if there
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is need to run as a usb host.
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The Raspberry Pi Pico chip run on 3.3 volts which is supplied by
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an on board regulator.
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Configurations
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==============
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gpio
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--------
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NuttShell configuration (console enabled in UART1, at 115200 bps) with GPIO examples.
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nsh
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---
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Basic NuttShell configuration (console enabled in UART1, at 115200 bps).
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nshsram
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-------
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NuttShell configuration (console enabled in UART1, at 115200 bps) with interrupt
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vectors in RAM.
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smp
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---
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Basic NuttShell configuration (console enabled in UART1, at 115200 bps) with
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both ARM cores enabled.
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usbnsh
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------
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Basic NuttShell configuration (console enabled in USB Port, at 115200 bps).
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