Machine Access System Software Design and Documentation Western Washington University By: Kevin Pogue

General System Design Kinetis MK60DN512VMD10 Bus Frequency -100 MHz Memory Requirements – 10 kB RAM – 20 kB ROM Kernel Choice – MQX RTOS – Tick Period – 1 ms

Priority of Tasks 9) Start Task 10) RFID Task 11)Key Task 12)LCD Task 13) User Interface Task 14) Main Task

Start Task – Initialize registers, hardware – Create tasks, control structures – Priority - 9 – Period: Once at startup – Estimated Execution Time: 200 ms – CPU Load: N/A

RFID Task – Communicate with RFID hardware – Priority - 10 – Period – Sporadic > 1 s – Execution time – 100 ms – Task CPU load. Peak - 0.1s / 1 s = 10% Average – 0.1s / 300 s = 0.003%

Key Task – Get and decode keypad input for use in the program – Priority - 11 – Period – 20 ms – Estimated Execution Time – 100 us – Task CPU load Average us/20 ms = 0.5% Peak – 500 us / 20 ms = 2.5%

LCD Task – Display information to the user – Priority -12 – Sporadic > 50ms – Estimated Execution Time – 3.2 ms – Task CPU load Peak (4 * 20 * 40 us ) / 50 ms = 6.4% Average (4 * 20 * 40 us) / 1 s = 0.32%

User Interface Task – Get input from and display information to user – Priority - 13 – Task Period – 30 ms – Estimated Task Execution Time - 1 ms – Task CPU load. Peak – 1 ms / 30 ms = 3.3% Average – 1 ms / 30 ms = 3.3%

Main Task Design – Control access decision making, output relay – Priority - 14 – Periodic – 500 ms – Estimated Task Execution Time – 50 us – Task/ISR CPU load Peak – 500 us / 500 ms = 0.1 % Average - 50 us / 500 ms = 0.01%

CPU load L max= (0.1s) + (500 us) + (3.2ms) +(1 ms) + (500 us) (1s) ( 20 ms) (50ms) (30 ms) (500 ms) L max= 22.3% L average = 7.1%

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