Multi-CAN Communication and GPIO Control Project
Three independent CAN communication channels operating simultaneously
Dedicated GPIO pins controlled by CAN message data
Timer-based relay control logic with periodic update
Interrupt-based CAN message reception for real-time response
Dynamic CAN baud-rate switching based on external input
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Product Benefits
Supports Multi-Network Communication :
Enables simultaneous operation of multiple CAN networks in a single system, useful for complex automotive or industrial applications Real-Time and Reliable Operation :
Interrupt-driven CAN handling and timer-based control ensure fast and deterministic response, meeting real-time system requirements Flexible Configuration :
Dynamic baud rate control and independent CAN channels allow compatibility with multiple network configurations and external devices Simplified Integration in Automotive and Industrial Systems :
Compact design and standardized CAN interface make it easy to integrate with existing vehicle control units or automation equipment Cost-Effective Multi-CAN Solution :
Offers multi-network functionality without requiring multiple controllers, making it suitable for mid-level embedded systems
Product Key Features
Simplifies ECU Flashing and Diagnostics :
Easily perform firmware updates, calibration, and diagnostic tasks on automotive ECUs with full UDS protocol support. No complex setup — plug in and start flashing instantly. Three-channel CAN communication with independent transceivers :
The system manages three separate CAN networks simultaneously, each capable of independent message transmission and reception Interrupt-based data reception for low-latency response :
CAN message handling is fully interrupt-driven, ensuring quick and deterministic responses to incoming data Timer-driven relay update mechanism :
A periodic timer interrupt controls relay toggling based on the latest CAN data, providing stable and repeatable timing behavior Dynamic CAN baud rate selection via external signal :
The system can switch communication speed dynamically (e.g., 125 kbps / 250 kbps / 500 kbps) using an external input signal
Product Software Features
Modular Initialization Architecture :
Separate initialization routines for CAN, GPIO, and Timer modules ensure clean, maintainable code.
– Each functional block (communication, control, timing) is isolated for clarity and reusability Interrupt-Driven CAN Communication :
CAN message reception is handled through interrupt service routines (ISR), reducing CPU polling load and improving real-time performance.
ISR updates shared data variables used by the relay control logic Timer-Based Task Scheduling :
A periodic timer interrupt executes relay control tasks at fixed intervals.
Ensures deterministic response and consistent timing for GPIO updates Scalable Code Framework :
Easily extendable to support more CAN channels or additional GPIO-controlled devices.
Uses clear function abstractions and structured variable naming for maintainability
Product Hardware Features
Triple CAN Interface Architecture :
Three independent CAN transceivers connected to dedicated CAN channels.
Enables simultaneous multi-bus communication for distributed control systems Isolated CAN Transceiver Design :
Each CAN transceiver has electrical isolation to protect against ground loops and noise coupling. Dedicated GPIO Relay Control Lines :
Multiple GPIO pins are used to drive relay modules.
Each relay is mapped to a specific CAN channel and message ID for independent control. Power Supply and Signal Integrity Considerations :
Proper decoupling capacitors and termination resistors (120 Ω) ensure clean signal transmission on the CAN bus.
Stable 5V/3.3V regulated supply supports transceivers and relay drivers Scalable and Modular PCB Layout :
Hardware designed in a modular fashion to allow easy addition of CAN channels or relay outputs
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