Abstract
We present a tool, called Clara, that performs real-time analysis and priority assignment for software tasks in a mixed hardware-software system with a custom run-time scheduler. We start from a system described in tasks/threads consisting of hardware specified in Verilog and software specified in C. We obtain the worst case execution time for each individual task. Then, based on the control flow of the application, Clara uses a dynamic programmming algorithm to automatically find optimal priorities for the software tasks assuming no interrupts. Assuming the set of software tasks runs on a microprocessor in a target architecture using a template we provide for the priority scheduler and interrupt code, Clara then finds the worst case execution time for the application with interrupts allowed. Thus, this tool brings real-time analysis to a system level for a particular run-time system. Clara helps a designer minimize the worst case execution time of a mixed hardware-software application.
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