Embedded Protocol CAN

• CAN – Controller Area Network
• Developed by Robert Bosch.
• Serial Communication
• Half-duplex communication.
• Asynchronous Type.
• Multi-master protocol – allowing it to connect multiple nodes
• Its Message Based.
• Two-wire configuration, consisting of CAN H (H-High) and CAN L (L-Low). Two-wire bus interconnects all nodes within the network. The wires typically constitute a twisted pair with a nominal impedance of 120 Ω.
• CAN supports communication over relatively short distances, typically up to 40 meters at speeds of 1 Mbps
• CAN Frame formats: CAN 2.0A and CAN2.0B

Protocol Frame Format

SOF

11-BitIdentifier

RTR

IDE

r0

DLC

0…8 bytes

CRC

ACK

EOF

IFS

Acronym	Lenth(Bits	Description
SOF	1	Start Of Frame
11 Bit Identifier	11	Establishes message priority; lower binary value indicates higher priority
RTR	1	Remote Transmission Request
IDE	1	Identifier Extension
r0	1	Reserved Bit
DLC	4	Data Length Code
0…8 Bytes	0 to 64 (8Byte Max)	Data Bytes
CRC	15	Cyclic Redundancy Check
ACK	1	Acknowledgement
EOF	7	End Of Frame
IFS	3	7-Bit Interframe Space

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Analyzer by Microchip 

• Product: https://www.microchip.com/DevelopmentTools/ProductDetails/PartNO/APGDT002
• You need to install the can bus analyzer windows software: https://www.microchip.com/DevelopmentTools/ProductDetails/PartNO/APGDT002#additional-summary
• Pinout Details : http://ww1.microchip.com/downloads/en/DeviceDoc/51848B.pdf
• Begin with a Quick Setup: Section 3.1 in http://ww1.microchip.com/downloads/en/DeviceDoc/51848B.pdf.

Get Start

1. Connect CAN_H, CAN_L, and Ground to the Microchip CAN Analyzer Hardware along with the testing hardware (Microcontroller).
2. Open the Windows tool and navigate to Microchip CAN BUS Analyzer.
3. Ensure that Normal Mode and Error Normal display a green background.
4. Proceed to Setup Hard > Hardware Setup > Set CAN bit-rate control.
5. Configure Logfile setup if you intend to log the CAN data.
6. Click Rolling Trace to initiate the monitoring process.
7. You can now observe the captured data within the tool interface.

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USB to CAN Bus Adapter by VSCOM

• Website: http://www.vscom.de/
• Product: vscom-Analyser
• Data Sheet: http://www.vscom.de/datasheet/430_data.pdf
• Pin Out details: http://www.vscom.de/datasheet/430_data.pdf 
• ASCII Commands of Serial: Setup the Bus Timing (Advanced): After close, the channel set the bit rate Example: C[R], s041C[CR]

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Troubleshoot

If you’re not getting any data or can’t see any data in the tool?

Task	Description
Check hardware connections	Ensure all hardware connections are properly connected.
Verify CAN driver settings	Confirm that all CAN drivers are enabled.
Configure Interrupts using HALCoGen tool	Ensure Interrupts are correctly configured in the HALCoGen tool for the TMS570LC4357 Controller.

Applications

Application	Description
Automotive Industry	Extensively used for communication between electronic control units (ECUs) in vehicles, enabling functions like engine management, diagnostics, and ADAS.
Industrial Automation	Employed in factory automation systems for communication between PLCs, sensors, actuators, and other devices, facilitating manufacturing processes.
Medical Devices	Utilized in medical equipment for communication between devices such as patient monitors, infusion pumps, and diagnostic equipment.
Aerospace and Defense	Used for communication between avionics, navigation systems, flight control systems, and other electronics in aircraft, spacecraft, and military vehicles.
Marine and Maritime	Employed in marine applications for communication between navigation systems, propulsion systems, and monitoring equipment on boats and ships.
Home Automation	Increasingly used for communication between smart devices, home appliances, security systems, and environmental controls in residential settings.
Electric Vehicles	Integral to the communication network in electric and hybrid vehicles, enabling coordination between powertrain components and battery management systems.
Rail Transportation	Utilized for communication between train control systems, signaling systems, passenger information systems, and onboard electronics in railway operations.

Advantage and Disadvantage

Advantages	Disadvantages
High reliability and fault tolerance	Higher cost compared to some other protocols
Real-time capability, suitable for time-critical applications	Requires termination resistors and careful network design
Support for multi-master communication	Limited maximum cable length without additional hardware
Flexible data rates and message prioritization	More complex implementation compared to simpler protocols
Built-in error detection and handling mechanisms	Potential electromagnetic interference in noisy environments
Wide industry adoption and support	Limited support for longer-distance communication without additional hardware

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CAN Interview Questions

• https://aruneworld.com/embedded/interview-questions-can/