I2C Control Device for Daisy Chain Topology
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Solution Overview
Problem
In complex topologies such as daisy chain topologies used in vehicle-mounted audio systems, implementing efficient control over slave devices and peripheral devices connected via an I2C bus remains a challenge due to limitations in existing control methods.
Innovation Solution
A control method and apparatus that enables quick control of slave devices and peripheral devices by sending a start signal, indication information, a control command, and a register address through an I2C bus, allowing for efficient communication and adaptability in various topologies by determining the target device based on mapping relationship information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a daisy chain topology is used to connect transmission devices, then the length of connection cable, cabling difficulty, and quantity of DSP devices are reduced, but the complexity of controlling slave devices and peripheral devices increases
Solution Approach 1:
The patent introduces a control device as an intermediary between the host and multiple slave devices/peripheral devices in the daisy chain topology. The control device receives control information from the host, processes it, and forwards appropriate commands to the target slave devices or peripheral devices. This mediator approach simplifies the host's control burden while maintaining efficient communication in the complex daisy chain configuration.
Solution Approach 2:
The patent segments the control function by separating the host's role (sending high-level control information) from the control device's role (processing and forwarding specific commands). This segmentation allows the host to manage multiple devices through a simplified interface while the control device handles the complexity of individual device communication protocols and addressing.
2Reliability
If traditional I2C bus control methods are used in complex topologies, then compatibility is maintained, but transmission efficiency and control speed are reduced
Solution Approach 1:
The patent merges multiple I2C communication operations into a single optimized transmission sequence. By combining the start signal, indication information, control command, and register address into one coordinated transmission flow, the system reduces the number of separate I2C transactions required, thereby improving transmission efficiency while maintaining standard I2C protocol compatibility.
Solution Approach 2:
The patent implements preliminary action by having the control device pre-process control information from the host before forwarding it to slave devices. The control device prepares the appropriate commands and addresses in advance, which streamlines the actual device control operations and improves overall transmission efficiency without compromising I2C protocol compliance.
Data Source
AI summary
A control method includes, after determining a target device to be controlled, a host sends indication information, a control command, and an address of a register of the target device to a control device through an Inter-Integrated Circuit (I2C) interface, so that the control device encapsulates the indication information, the control command, and the address of the register of the target device, and sends the indication information, the control command, and the address of the register of the target device that are encapsulated to a slave device connected to the control device.