RP2 (Raspberry Pi Pico)

This page describes information about the Kaluma port for Raspberry Pi Pico.

Pinout

Raspberry Pi Pico (from https://raspberrypi.org)

Upload firmware (.UF2)

You can upload Kaluma firmware to your Raspberry Pi Pico board by following steps.

  1. Download Kaluma firmware .UF2 file from https://kaluma.io/download.
  2. Push and hold the BOOTSEL button and plug into USB port of your computer. Release the BOOTSEL button after connected. It will mount as as USB storage device named RPI-RP2.
  3. Drag and drop the downloaded .UF2 onto the RPI-RP2 volume. Your Pico will reboot automatically.
  4. Now Kaluma is running on your Pico.

Skip code loading on boot

Sometimes you need to skip loading the code stored in the internal flash on boot. You can skip code loading by setting GP22 to GND.

Skip code loading by set GP22 to GND

Object: board

This section shows the Raspberry Pi Pico specific properties of the global board object.

board.LED

  • <number>

The GPIO number for the on-board LED.

console.log(board.LED); // 25

Flash

Pico has 2MB flash size. 1008KB are used for firmware binary and the rest (1040KB) are used for user (total 260 blocks, block size is 4KB). Here is the flash allocation map.

Block Size
0~3 16KB Storage (Key-Value)
4~131 512KB User Program
132~259 512KB File System (LittleFS)

PWM

There are 16 PWM channels (8 2-channel slices). GPIO pins sharing a channel (e.g. GPIO 0 and GPIO16) cannot be used at the same time.

GPIO Channel GPIO Channel GPIO Channel
0 0A 10 5A 20 2A
1 0B 11 5B 21 2B
2 1A 12 6A 22 3A
3 1B 13 6B 23 3B
4 2A 14 7A 24 4A
5 2B 15 7B 25 4B
6 3A 16 0A 26 5A
7 3B 17 0B 27 5B
8 4A 18 1A 28 6A
9 4B 19 1B 29 6B

I2C

Default values for I2C functions.

Function Default
I2C baudrate 400,000
I2C0 SCL GPIO 4
I2C0 SDA GPIO 5
I2C1 SCL GPIO 2
I2C1 SDA GPIO 3

SPI

Default values for SPI functions.

Function Default
SPI baudrate 1,000,000
SPI0 SCK GPIO 18
SPI0 MOSI (TX) GPIO 19
SPI0 MISO (RX) GPIO 16
SPI1 SCK GPIO 10
SPI1 MOSI (TX) GPIO 11
SPI1 MISO (RX) GPIO 12

UART

Default values for UART functions.

Function Default
UART baudrate 115,200
UART buffer size 2,048
UART0 TX GPIO 0
UART0 RX GPIO 1
UART1 TX GPIO 8
UART1 RX GPIO 9

Storage

Capacity for Storage functions.

Capacity Value
Max size of storage item 253 bytes (key size + value size)
Max number of storage items 64