Adafruit QT Py RP2040¶
The QT Py RP2040 is a tiny general purpose RP2040 board supplied by Adafruit.
Features¶
RP2040 microcontroller chip
Dual-core ARM Cortex M0+ processor, flexible clock running up to 133 MHz
264kB of SRAM, and 8MB of on-board Flash memory
Castellated module allows soldering direct to carrier boards
USB Host and Device support via type C connector.
Low-power sleep and dormant modes
Drag & drop programming using mass storage over USB
13 multi-function GPIO pins (11 breakout pads and two QT pads)
2× SPI, 2× I2C, 2× UART, 4× 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 GPIO pins 20 (RX GPIO1) and pin 5 (TX GPIO1). This console runs a 115200-8N1.
The board can be configured to use the USB connection as the serial console.
Buttons and LEDs¶
A ws2812 (NeoPixel) smart RGB LED controlled by GPIO12 (data) and GPIO11 (power).
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.
A RESET button that allows rebooting the board without disconnecting the power.
Pin Mapping¶
Pads numbered anticlockwise from USB connector.
Pad |
Signal |
Notes |
|---|---|---|
1 |
GPIO26 |
ADC0 |
2 |
GPIO27 |
ADC1 |
3 |
GPIO28 |
ADC2 |
4 |
GPIO29 |
ADC3 |
5 |
GPIO24 |
|
6 |
GPIO25 |
|
7 |
GPIO20 |
Default TX for UART1 serial console |
8 |
GPIO5 |
Default RX for UART1 serial console |
9 |
GPIO6 |
|
10 |
GPIO4 |
|
11 |
GPIO3 |
|
12 |
3.3V |
Power out to peripherals. |
13 |
Ground |
|
14 |
5V |
The board has a STEMMA QT connector that is also connected to pins GPIO22 (I2C1 SDA) and GPIO23 (I2C1 SCL).
Power Supply¶
The Raspberry Pi Pico can be powered via the USB connector, or by supplying +5V to pin 14. The board had a diode that prevents power from pin 14 from flowing back to the USB socket, although this can be disabled by connecting on-board solder pads if there is need to run as a usb host.
The Raspberry Pi Pico chip run on 3.3 volts which is supplied by an on board regulator.
Configurations¶
gpio¶
NuttShell configuration (console enabled in UART1, at 115200 bps) with GPIO examples.
nsh¶
Basic NuttShell configuration (console enabled in UART1, at 115200 bps).
nshsram¶
NuttShell configuration (console enabled in UART1, at 115200 bps) with interrupt vectors in RAM.
smp¶
Basic NuttShell configuration (console enabled in UART1, at 115200 bps) with both ARM cores enabled.
usbnsh¶
Basic NuttShell configuration (console enabled in USB Port, at 115200 bps).