CAN AVR

About

CAN ( Controller-area network ) on AVR chipsets. for information about CAN/CANopen stack , go here CANopen. for general information about CAN chipsets and physical topics , go CAN.

ard'ware

Usual Arduino AtmegaXXX have no CAN controller. I see 3 methods to get it :

1. AVR using SPI/UART/... connecting to a CAN controller like MCP2515 :
   • http://www.siwawi.arubi.uni-kl.de/avr_projects/can/index.html
   • http://www.mikroe.com/en/tools/can2/
   • http://www.siwawi.arubi.uni-kl.de/avr_projects/can/index.html
   • http://www.kreatives-chaos.com/artikel/universelle-can-bibliothek
2. Emulate the CAN controller with external interrupt register and threading support :
   • http://caraca.sourceforge.net/
3. Use automotive serie of AtMega that have CAN controller

IMHO , the 3rd method is the more efficient.

AtMega automotive serie

• ATmega16M1
• ATmega32M1
• ATmega64M1
• ATmega32C1
• ATmega64C1

M serie has one 12-bit High Speed PSC (Power Stage Controller) :

• Non Overlapping Inverted PWM Output Pins With Flexible Dead-Time
• Variable PWM duty Cycle and Frequency
• Synchronous Update of all PWM Registers
• Auto Stop Function for Emergency Event

supported by avr-libc , it that can be useful.

They have JTAG _AND_ ISP. Using ATmega let us in the arduino community , our tool set and knowledge.

So the more valuable is ATmega64M with 64kb like sanguino but the cheapest could fit needs of most people.

more infos on this atmel products :

• http://atmel.com/products/canvan
• AVR MCUs for Automotive Motor Control Applications

share work with others open source projects

• CAN support is a feature request of openservo project : http://openservo.com/Software_Feature_Requests

OpenServo 2.1 is based on AVR ATmega168 .

• http://ecomodder.com/wiki/index.php/MPGuino , this community need CAN support too.