Adafruit Feather M4 CAN Express with ATSAME51

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The Feather M4 Express upgraded to the SAME51 chipset, which has built-in CAN bus support. Like its SAMD51 cousin, the ATSAME51J19 comes with a 120MHz Cortex M4 with floating point support and 512KB Flash, and 192KB RAM. 

At the end of the board, there is a CAN Bus transceiver chip and a 5VDC converter to generate power to the transceiver, even when running on battery. The two CAN Bus signal lines and ground reference signal are available on a 3-pin 3.5mm terminal block. The chip and booster can switch to sleep mode for power saving. The built-in CAN port can read or write packets, and it supports Arduino and CircuitPython.

The most exciting part of the Feather M4 CAN is that while you can use it with the Arduino IDE, you can also use it with CircuitPython. It will show up as a tiny disk drive with main.py on it when you plug it in—edit main.py using your preferred text editor to build your project using Python, the popular programming language. No installs, IDE, or compiler are needed so that you can use it on any computer, even ChromeBooks or computers you can't install software on. When you're done, unplug the Feather, and your code will go with you.

Feather M4 CAN

• Measures 2.0" x 0.9" x 0.28" (50.8mm x 22.8mm x 7mm) without headers soldered in
• Light as a (large?) feather - 5 grams
• ATSAME51 32-bit Cortex M4 core running at 120 MHz, 32-bit, 3.3V 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
• 3.3V regulator with 500mA peak current output
• USB Type 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
• Tons of GPIO! 21 x 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 x hardware SERCOM - Native hardware SPI, I2C and Serial all available
  • 16 x PWM outputs - for servos, LEDs, etc
  • I2S input and output
  • 8-bit Parallel capture controller (for camera/video in)
• Built in 100mA lipoly charger with charging status indicator LED
• Pin #13 red LED for general purpose blinking
• Power/enable pin
• 4 mounting holes
• Reset button
• Dimensions: 52.2mm x 22.8mm x 7.2mm / 2.1" x 0.9" x 0.3"
• Weight: 5.5g / 0.2oz

Development Resources

• Primary Guide: Adafruit Feather M4 CAN Express...

The Definitive Guide to ARM Cortex-M3 and Cortex-M4 Processors

This book illustrates the background of the ARM architecture and summarizes the characteristics of the processors such as the instruction set, interrupt-handling, and demonstrates how to program and employ the advanced features available such as the Memory Protection Unit (MPU).

Chapters on getting started with IAR, Keil, gcc, and CooCox CoIDE tools help beginners develop their program codes.

Coverage also contains the necessary areas of software development such as using the low power features, handling information input/output, mixed language projects with assembly and C, and other advanced topics.

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