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circuitpython-org/_board/feather_m4_can.md
Jeff Epler 4715875cc4 Fix board dates to always be of the form YYYY-MM-DD 
.. leading zeros are required for `frontmatter` to treat them as dates
rather than strings, apparently per the YAML specification.

This was done by script:
```py
import re
import datetime
import pathlib
import sys

import frontmatter

rx = re.compile(r'^(\s*)date_added:.*$', re.M)

for path_str in sys.argv[1:]:
    print(path_str)
    path = pathlib.Path(path_str)

    post = frontmatter.load(path)
    date_added = post.get("date_added", "")

    if isinstance(date_added, datetime.date):
        continue

    if isinstance(date_added, str):
        try:
            date_added = datetime.datetime.strptime(date_added, "%Y-%m-%d")
        except ValueError as exc:
            print(f"Failed to parse date {date_added} in {path_str}: {exc}")
            continue

    date_added = date_added.date()
    content = path.read_text("utf-8")
    new_content = rx.sub(lambda m: f"{m.group(1)}date_added: {date_added}", content)
    assert content != new_content

    path.write_text(new_content, "utf-8")
```
2024-03-22 11:31:45 -05:00

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layout board_id title name manufacturer board_url board_image date_added family bootloader_id features
download feather_m4_can Feather M4 CAN Download Feather M4 CAN Adafruit
https://www.adafruit.com/product/4759
feather_m4_can.jpg 2020-09-28 atmel-samd feather_m4_can
Feather-Compatible
Battery Charging
USB-C
Breadboard-Friendly

One of our favorite Feathers, the Feather M4 Express, gets a glow-up here with an upgrade to the SAME51 chipset which has built-in CAN bus support! Like its SAMD51 cousin, the ATSAME51J19 comes with a 120 MHz Cortex M4 with floating point support and 512 KB Flash and 192 KB RAM. Your code will zig and zag and zoom, and with a bunch of extra peripherals for support, this will for sure be your favorite new chipset for CAN interfacing projects.

At the end of the board we have placed a CAN transceiver chip as well as a 5 V converter to generate 5 V power to the transceiver even when running on battery. The two CAN signal lines and ground reference signal are available on a 3-pin 3.5 mm terminal block. The chip and booster can be put to sleep for power saving. The built-in CAN can read or write packets and has support in both Arduino and CircuitPython.

Like the original Feather M4 Express, you'll find a Mini NeoPixel and 2 MB SPI Flash. When used in CircuitPython, the 2 MB flash acts as storage for all your scripts, libraries and files.

And best of all, it's a Feather - so you know it will work with all our FeatherWings! What a great way to quickly get up and running. It's even pin-compatible with the original Feather M4.

Easy reprogramming: the Feather M4 CAN comes pre-loaded with the UF2 bootloader, which looks like a USB storage key. Simply drag firmware on to program, no special tools or drivers needed! It can be used to load up CircuitPython or Arduino IDE (it is bossa-compatible).

Comes fully assembled and tested, with the UF2 USB bootloader. We also toss in some headers so you can solder it in and plug into a solderless breadboard.

Technical details

  • Measures 2.0" x 0.9" x 0.28" (50.8 mm x 22.8 mm x 7 mm) without headers soldered in
  • Light as a (large?) feather - 5 grams
  • ATSAME51 32-bit Cortex M4 core running at 120 MHz, 32-bit, 3.3 V logic and power
  • Hardware CAN bus support with built-in transceiver, 5V booster and terminal connection.
  • Floating point support with Cortex M4 DSP instructions
  • 512 KB flash, 192 KB RAM
  • 2 MB SPI FLASH chip for storing files and CircuitPython code storage.
  • No EEPROM
  • 32.768 kHz crystal for clock generation & RTC
  • 3.3 V regulator with 500 mA peak current output
  • USB-C connector for USB native support, comes with USB bootloader and serial port debugging
  • Built in crypto engines with AES (256 bit), true RNG, Pubkey controller
  • 21 GPIO pins with following capabilities:
    • Dual 1 MSPS 12 bit true analog DAC (A0 and A1) - can be used to play 12-bit stereo audio clips
    • Dual 1 MSPS 12 bit ADC (6 analog pins some on ADC1 and some on ADC2)
    • 6 hardware SERCOM - Native hardware SPI, I2C and Serial all available
    • 16 PWM outputs - for servos, LEDs, etc
    • I2S input and output
    • 8-bit Parallel capture controller (for camera/video in)
  • Built in 100 mA lipoly charger with charging status indicator LED
  • Pin #13 red LED for general purpose blinking
  • Power/enable pin
  • 4 mounting holes
  • Reset button

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