RP2040-Zero
Overview
RP2040-Zero, A Low-Cost, High-Performance Pico-Like MCU Board Based On Raspberry Pi Microcontroller RP2040.
Hardware
RP2040 microcontroller chip designed by Raspberry Pi in the United Kingdom.
Dual-core Arm Cortex M0+ processor, flexible clock running up to 133 MHz.
264KB of SRAM, and 2MB of on-board Flash memory.
USB-C connector, keeps it up to date, easier to use.
The castellated module allows soldering direct to carrier boards.
USB 1.1 with device and host support.
Low-power sleep and dormant modes.
Drag-and-drop programming using mass storage over USB.
29 × multi-function GPIO pins (20× via edge pinout, others via solder points).
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 I/O (PIO) state machines for custom peripheral support.
Supported Features
The rp2040_zero board supports the hardware features listed below.
- on-chip / on-board
- Feature integrated in the SoC / present on the board.
- 2 / 2
-
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files. -
vnd,foo -
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.
Type |
Location |
Description |
Compatible |
|---|---|---|---|
CPU |
on-chip |
ARM Cortex-M0+ CPU2 |
|
ADC |
on-chip |
RaspberryPi Pico ADC1 |
|
Clock control |
on-chip |
Raspberry Pi Pico clock controller node1 |
|
on-chip |
|||
on-chip |
The representation of Raspberry Pi Pico’s PLL2 |
||
on-chip |
The representation of Raspberry Pi Pico ring oscillator1 |
||
on-chip |
The representation of Raspberry Pi Pico external oscillator1 |
||
Counter |
on-chip |
RaspberryPi Pico timer1 |
|
DMA |
on-chip |
Raspberry Pi Pico DMA1 |
|
Flash controller |
on-chip |
Raspberry Pi Pico flash controller1 |
|
GPIO & Headers |
on-chip |
Raspberry Pi Pico GPIO1 |
|
on-chip |
Raspberry Pi Pico GPIO Port1 |
||
I2C |
on-chip |
Raspberry Pi Pico I2C2 |
|
Interrupt controller |
on-chip |
ARMv6-M NVIC (Nested Vectored Interrupt Controller) controller1 |
|
LED strip |
on-board |
The pio node configured for ws28121 |
|
Miscellaneous |
on-chip |
Raspberry Pi Pico PIO2 |
|
MTD |
on-chip |
Flash node1 |
|
on-board |
Fixed partitions of a flash (or other non-volatile storage) memory1 |
||
Pin control |
on-chip |
The RPi Pico pin controller is a node responsible for controlling pin function selection and pin properties, such as routing a UART0 Rx to pin 1 and enabling the pullup resistor on that pin1 |
|
PWM |
on-chip |
Raspberry Pi Pico PWM1 |
|
Regulator |
on-chip |
RaspberryPi Pico core supply regurator1 |
|
Reset controller |
on-chip |
Raspberry Pi Pico Reset Controller1 |
|
RTC |
on-chip |
RaspberryPi Pico RTC1 |
|
Sensors |
on-chip |
RaspberryPi Pico family temperature sensor node1 |
|
Serial controller |
on-chip |
||
SPI |
on-chip |
||
SRAM |
on-chip |
Generic on-chip SRAM description1 |
|
Timer |
on-chip |
ARMv6-M System Tick1 |
|
USB |
on-chip |
RaspberryPi Pico USB Device Controller1 |
|
Watchdog |
on-chip |
Raspberry Pi Pico Watchdog1 |
Pin Mapping
The peripherals of the RP2040 SoC can be routed to various pins on the board. The configuration of these routes can be modified through DTS. Please refer to the datasheet to see the possible routings for each peripheral.
Default Zephyr Peripheral Mapping:
UART0_TX : P0
UART0_RX : P1
I2C0_SDA : P4
I2C0_SCL : P5
I2C1_SDA : P6
I2C1_SCL : P7
ADC_CH0 : P26
ADC_CH1 : P27
ADC_CH2 : P28
ADC_CH3 : P29
Programming and Debugging
Flashing
Using UF2
Here is an example of building the sample for driving the built-in RGB led.
west build -b rp2040_zero samples/drivers/led/led_strip
You must flash the RP2040-Zero with an UF2 file. One option is to use West (Zephyr’s meta-tool). To enter the UF2 flashing mode just keep the BOOT button pressed while you connect the USB port, it will appear on the host as a mass storage device. In alternative with the board already connected via USB you can keep the RESET button pressed, press and release BOOT, release RESET. At this point you can flash the image file by running:
west flash
In alternative you can locate the generated file at build/zephyr/zephyr.uf2 file and simply drag-and-drop to the device after entreing the UF2 flashing mode.