Bus Control Semaphore for Master Device Conflict Resolution
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Solution Overview
Problem
In communication bus systems, conflicts arise when two master devices simultaneously attempt to control a single slave device, leading to data loss and operational complications.
Innovation Solution
A method is implemented to monitor and regulate control of a slave device by granting and relinquishing control based on a defined timer or semaphore, ensuring exclusive access to prevent conflicts and maintain proper operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple master devices are allowed to control a slave device simultaneously, then device versatility and communication efficiency are improved, but data loss and operational conflicts occur
Solution Approach 1:
The patent introduces a control semaphore as an intermediary mechanism that mediates access requests from multiple master devices to a slave device. The semaphore acts as a gatekeeper, allowing only one master device to control the slave at any given time, thus preventing data conflicts while maintaining system productivity.
Solution Approach 2:
The system performs preliminary actions by requiring master devices to request control permission before accessing the slave device. The control timer is set in advance to automatically relinquish control after a defined period, preventing indefinite monopolization and ensuring fair access opportunities for other master devices.
2Stability of the object's composition
If control is granted to a master device for an extended period, then operation stability is improved, but access fairness and system responsiveness deteriorate
Solution Approach 1:
The control timer implements periodic action by automatically relinquishing control after a predetermined time interval. This ensures that no single master device can monopolize the slave device indefinitely, maintaining operation stability through controlled access while preventing excessive access delays for other master devices.
3Reliability
If a control mechanism is implemented to prevent conflicts, then data integrity is improved, but device complexity increases
Solution Approach 1:
The control semaphore and timer mechanism serves multiple functions: it grants control permission, tracks control duration, automatically relinquishes control, and prevents conflicts. This multi-functional approach achieves data integrity without requiring separate complex mechanisms for each function, thereby minimizing overall system complexity.
Data Source
AI summary
A system, computer-implemented method, and a computer program product for regulating control of a slave device on a communications bus includes monitoring for a request for control of the slave device by a master device. Control of the slave device is granted to the master device. Control of the slave device is relinquished by the master device after the occurrence of a relinquishment event.