Description:

The Adafruit Feather RP2020 boasts the Raspberry Pi RP2040 chip, coupled with all niceties you know and love about Feather.

Inside the RP2040 is a ‘permanent ROM’ USB UF2 bootloader. What that means is when you want to program new firmware, you can hold down the BOOTSEL button while plugging it into USB (or pulling down the RUN/Reset pin to the ground) and it will appear as a USB disk drive you can drag the firmware onto.

The RP2040 is a powerful chip, which has the clock speed of our M4 (SAMD51), and two cores that are equivalent to our M0 (SAMD21). Since it is an M0 chip, it does not have a floating point unit or DSP hardware support – so if you’re doing something with heavy floating-point math, it will be done in software and thus not as fast as an M4. For many other computational tasks, you’ll get close-to-M4 speeds!

For peripherals, there are two I2C controllers, two SPI controllers, and two UARTs that are multiplexed across the GPIO – check the pinout for what pins can be set to which. There are 16 PWM channels, each pin has a channel it can be set to (ditto on the pinout).

You’ll note there’s no I2S peripheral, SDIO, or camera, what’s up with that? Well instead of having specific hardware support for serial-data-like peripherals like these, the RP2040 comes with the PIO state machine system which is a unique and powerful way to create custom hardware logic and data processing blocks that run on their own without taking up a CPU. For example, NeoPixels – often we bitbang the timing-specific protocol for these LEDs. For the RP2040, we instead use a PIO object that reads in the data buffer and clocks out the right bitstream with perfect accuracy. Same with I2S audio in or out, LED matrix displays, 8-bit or SPI-based TFTs, and even VGA! In MicroPython and CircuitPython you can create PIO control commands to script the peripheral and load it in at runtime. There are 2 PIO peripherals with 4 state machines each.

While the RP2040 has lots of onboard RAM (264KB), it does not have built-in FLASH memory. Instead, that is provided by the external QSPI flash chip. On this board there is 8 MB, which is shared between the program it’s running and any file storage used by MicroPython or CircuitPython. When using C/C++ you get the whole flash memory, if using Python you will have about 7 MB remaining for code, files, images, fonts, etc.

Specifications:

• • RP2040 32-bit Cortex M0+ dual core running at ~125 MHz @ 3.3V logic and power
  • 264 KB RAM
  • 8 MB SPI FLASH chip for storing files and CircuitPython/MicroPython code storage. No EEPROM
  • Tons of GPIO! 21 x GPIO pins with the following capabilities:
    • Four 12-bit ADCs (one more than Pico)
    • Two I2C, Two SPI, and two UART peripherals, we label one for the ‘main’ interface in standard Feather locations
    • 16 x PWM outputs – for servos, LEDs, etc
    • The 8 digital ‘non-ADC/non-peripheral’ GPIO are consecutive for maximum PIO compatibility
  • Built-in 200mA+ lipoly charger with charging status indicator LED
  • Pin #13 red LED for general purpose blinking
  • RGB NeoPixel for full-colour indication.
  • On-board STEMMA QT connector that lets you quickly connect any Qwiic, STEMMA QT, or Grove I2C devices with no soldering!
  • Both Reset button and Bootloader select button for quick restarts (no unplugging-replugging to relaunch code)
  • 3.3V Power/enable pin
  • Optional SWD debug port can be soldered in for debug access
  • 4 mounting holes
  • 12 MHz crystal for perfect timing.
  • 3.3V regulator with 500mA peak current output
  • USB Type C connector lets you access built-in ROM USB bootloader and serial port debugging
  • Weight: 5g
  • Dimensions: 51mm x 23mm x 7.5mm (without header pins)

RP2040 Chip Features

• • Dual ARM Cortex-M0+ @ 133MHz
  • 264kB on-chip SRAM in six independent banks
  • Support for up to 16MB of off-chip Flash memory via dedicated QSPI bus
  • DMA controller
  • Fully-connected AHB crossbar
  • Interpolator and integer divider peripherals
  • On-chip programmable LDO to generate the core voltage
  • 2 on-chip PLLs to generate USB and core clocks
  • 30 GPIO pins, 4 of which can be used as analog inputs
  • Peripherals
    • 2 x UARTs
    • 2 x SPI controllers
    • 2 x I2C controllers
    • 16 x PWM channels
    • USB 1.1 controller and PHY, with host and device support
    • 8 x PIO state machines

Contents:

• 1 x Adafruit Feather RP2040