Add full automotive RTOS project
Add kernel (Cortex-M0/M3/M4, Tricore, S32K, RISC-V ports), drivers, middleware (CAN stack, diagnostics, safety), applications, board support, build/test tooling, and documentation.
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#!/usr/bin/env python3
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"""
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@file task_priority_calculator.py
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@brief Task priority calculator for Rate Monotonic Scheduling
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"""
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import sys
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import argparse
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from collections import defaultdict
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from math import ceil
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class TaskPriorityCalculator:
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"""Calculate task priorities using RMS/DMS algorithms"""
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def __init__(self):
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self.tasks = []
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def add_task(self, name, period_ms, execution_time_ms, deadline_ms=None):
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"""Add task for analysis"""
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if deadline_ms is None:
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deadline_ms = period_ms
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self.tasks.append({
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'name': name,
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'period': period_ms,
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'execution_time': execution_time_ms,
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'deadline': deadline_ms
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})
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def calculate_utilization(self):
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"""Calculate CPU utilization"""
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total_utilization = 0
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for task in self.tasks:
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utilization = task['execution_time'] / task['period']
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task['utilization'] = utilization
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total_utilization += utilization
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return total_utilization
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def rate_monotonic_priority(self):
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"""Assign priorities using Rate Monotonic Scheduling"""
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# Sort by period (shortest period = highest priority)
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sorted_tasks = sorted(self.tasks, key=lambda x: x['period'])
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for i, task in enumerate(sorted_tasks):
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task['rms_priority'] = i
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return sorted_tasks
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def deadline_monotonic_priority(self):
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"""Assign priorities using Deadline Monotonic Scheduling"""
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# Sort by deadline (shortest deadline = highest priority)
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sorted_tasks = sorted(self.tasks, key=lambda x: x['deadline'])
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for i, task in enumerate(sorted_tasks):
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task['dms_priority'] = i
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return sorted_tasks
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def check_schedulability(self):
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"""Check if task set is schedulable"""
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n = len(self.tasks)
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total_utilization = self.calculate_utilization()
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# Liu & Layland bound for RMS
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rms_bound = n * (2 ** (1/n) - 1)
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# Exact schedulability test
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schedulable = True
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for i, task in enumerate(sorted(self.tasks, key=lambda x: x['priority'])):
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# Calculate response time
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response_time = task['execution_time']
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while True:
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interference = 0
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for j in range(i):
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higher_task = self.tasks[j]
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interference += ceil(response_time / higher_task['period']) * \
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higher_task['execution_time']
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new_response = task['execution_time'] + interference
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if new_response == response_time:
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break
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response_time = new_response
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if response_time > task['deadline']:
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schedulable = False
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break
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task['response_time'] = response_time
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if not schedulable:
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break
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return schedulable, total_utilization, rms_bound
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def generate_report(self):
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"""Generate priority assignment report"""
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print("=" * 80)
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print("Task Priority Calculation Report")
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print("=" * 80)
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print()
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# Calculate utilization
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total_utilization = self.calculate_utilization()
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print("Task Set:")
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print("-" * 80)
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print(f"{'Task':20s} {'Period':>8s} {'Exec Time':>10s} {'Deadline':>8s} {'Util':>8s}")
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print("-" * 80)
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for task in self.tasks:
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print(f"{task['name']:20s} {task['period']:8d} "
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f"{task['execution_time']:10d} {task['deadline']:8d} "
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f"{task['utilization']*100:7.2f}%")
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print("-" * 80)
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print(f"{'Total':20s} {'':>8s} {'':>10s} {'':>8s} {total_utilization*100:7.2f}%")
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print()
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# Rate Monotonic
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print("Rate Monotonic Priority Assignment:")
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print("-" * 40)
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rms_tasks = self.rate_monotonic_priority()
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for task in rms_tasks:
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print(f" Priority {task['rms_priority']}: {task['name']}")
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print()
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# Deadline Monotonic
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print("Deadline Monotonic Priority Assignment:")
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print("-" * 40)
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dms_tasks = self.deadline_monotonic_priority()
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for task in dms_tasks:
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print(f" Priority {task['dms_priority']}: {task['name']}")
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print()
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# Schedulability
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schedulable, utilization, bound = self.check_schedulability()
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print("Schedulability Analysis:")
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print("-" * 40)
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print(f"CPU Utilization: {utilization*100:.2f}%")
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print(f"Theoretical Bound: {bound*100:.2f}%")
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if schedulable:
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print("✓ Task set is schedulable")
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else:
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print("✗ Task set is NOT schedulable")
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print()
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print("Response Times:")
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print("-" * 40)
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for task in self.tasks:
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if 'response_time' in task:
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print(f" {task['name']}: {task['response_time']}ms "
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f"(deadline: {task['deadline']}ms)")
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def main():
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parser = argparse.ArgumentParser(description='Task priority calculator')
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parser.add_argument('--tasks', nargs='+', help='Task definitions: name:period:exec[:deadline]')
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parser.add_argument('--file', help='Task definition file')
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args = parser.parse_args()
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calculator = TaskPriorityCalculator()
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# Load tasks from file or command line
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if args.file:
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with open(args.file, 'r') as f:
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for line in f:
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line = line.strip()
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if line and not line.startswith('#'):
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parts = line.split(':')
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if len(parts) >= 3:
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name = parts[0]
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period = int(parts[1])
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exec_time = int(parts[2])
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deadline = int(parts[3]) if len(parts) > 3 else period
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calculator.add_task(name, period, exec_time, deadline)
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elif args.tasks:
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for task_def in args.tasks:
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parts = task_def.split(':')
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if len(parts) >= 3:
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name = parts[0]
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period = int(parts[1])
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exec_time = int(parts[2])
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deadline = int(parts[3]) if len(parts) > 3 else period
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calculator.add_task(name, period, exec_time, deadline)
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else:
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# Example tasks
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print("Using example task set:")
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calculator.add_task("Engine Control", 1, 0.5)
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calculator.add_task("Brake Control", 5, 1)
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calculator.add_task("CAN Communication", 10, 2)
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calculator.add_task("Sensor Reading", 2, 0.3)
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calculator.add_task("Display Update", 50, 10)
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calculator.generate_report()
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if __name__ == '__main__':
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main()
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