Raspberry Pi Pico¶
The Raspberry Pi Pico is a general purpose board supplied by the Raspberry Pi Foundation.
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 applied to the board, the cause the RP2040 to boot programming mode and appear to a computer connected via USB as a storage device. 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 |
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 |
33 |
AGND |
Analog Ground |
34 |
GPIO28 |
ADC2 |
35 |
ADC_VREF |
|
36 |
3V3 |
Power output to peripherals |
37 |
3V3_EN |
Pull to ground to turn off. |
38 |
Ground |
|
39 |
VSYS |
+5V Supply to board |
40 |
VBUS |
Connected to USB +5V |
Separate pins for the Serial Debug Port (SDB) are available
Power Supply¶
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 in PFM mode which provides the best efficiency, but may be switched to PWM mode for improved ripple by outputting a one on GPIO23.
Configurations¶
audiopack¶
NuttShell configuration (console enabled in UART0, at 115200 bps) with support for NSPlayer audio player.
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).
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).