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SparkFun Pro Micro RP2040

Overview

The SparkFun Pro Micro RP2040 is a small, low-cost, versatile board from SparkFun. It is equipped with an RP2040 SoC, an on-board WS2812 addressable LED, a USB connector, and a Qwiic connector. The USB bootloader allows it to be flashed without any adapter, in a drag-and-drop manner.

Hardware

Dual core Arm Cortex-M0+ processor running up to 133MHz
264KB on-chip SRAM
16MB on-board QSPI flash with XIP capabilities
18 GPIO pins
4 Analog inputs
1 UART peripherals
1 SPI controllers
2 I2C controllers (one via Qwiic connector)
16 PWM channels
USB 1.1 controller (host/device)
8 Programmable I/O (PIO) for custom peripherals
On-board RGB LED
1 Watchdog timer peripheral

Supported Features

The sparkfun_pro_micro_rp2040 board configuration supports the following hardware features:

Peripheral	Kconfig option	Devicetree compatible
NVIC	N/A	`arm,v6m-nvic`
UART	`CONFIG_SERIAL`	`raspberrypi,pico-uart`
GPIO	`CONFIG_GPIO`	`raspberrypi,pico-gpio`
ADC	`CONFIG_ADC`	`raspberrypi,pico-adc`
I2C	`CONFIG_I2C`	`snps,designware-i2c`
SPI	`CONFIG_SPI`	`raspberrypi,pico-spi`
USB Device	`CONFIG_USB_DEVICE_STACK`	`raspberrypi,pico-usbd`
HWINFO	`CONFIG_HWINFO`	N/A
Watchdog Timer (WDT)	`CONFIG_WATCHDOG`	`raspberrypi,pico-watchdog`
PWM	`CONFIG_PWM`	`raspberrypi,pico-pwm`
Flash	`CONFIG_FLASH`	`raspberrypi,pico-flash`
Clock controller	`CONFIG_CLOCK_CONTROL`	`raspberrypi,pico-clock-controller`
UART (PIO)	`CONFIG_SERIAL`	`raspberrypi,pico-uart-pio`

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
I2C1_SDA : P2
I2C1_SCL : P3
SPI0_RX : P20
SPI0_SCK : P18
SPI0_TX : P19

Programming and Debugging

Flashing

Using UF2

The Pro Micro board does make the SWD pins available on pads on the underside of the board. You can solder to these pins, and use a JTag debugger. You can also flash the SparkFun ProMicro RP2040 with a UF2 file. By default, building an app for this board will generate a build/zephyr/zephyr.uf2 file. If the Pro Micro RP2040 is powered on with the BOOTSEL button pressed, it will appear on the host as a mass storage device. The UF2 file should be copied to the device, which will flash the Pro Micro RP2040.