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Multi-Access Lock

This document outlines the system requirements for a multi-access locking mechanism controlled by the MC9S12C128 microcontroller, operating at a bus frequency of 24MHz. Memory requirements include 11KB Flash EEPROM and 3KB RAM. The system utilizes MicroC/OS-II as its kernel with tasks such as the magnetic reader, user interface, and keypad handling. Each task has specified priorities, execution times, and periodic execution. The document also provides data flow diagrams related to the modules for better understanding of the system design and interactions.

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Multi-Access Lock

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  1. Multi-Access Lock Andrew Hall

  2. General System Requirements • MCU: MC9S12C128 • Bus Frequency: 24MHz • Memory Requirements: • 11k bytes Flash EEPROM • 3k bytes RAM • Kernel: MicroC/OS-II • Tick Period: 1ms

  3. Task Priorities • Start Task • Mag. Reader Task • User Interface Task • Keypad Task

  4. Start Task • Initializes the system • Creates the other tasks • Priority: 4 • Period: once (at start-up) • Execution Time: ~ 1 sec

  5. Mag. Reader Task • Reads the card data • Priority: 5 • Period: 200 ms (sporadic) • Execution Time: 2ms (max)

  6. User Interface Task • Displays user prompt • Receives and tests user inputs • Saves user name and pin# • Controls locking mechanism • Priority: 6 • Period: 20ms(sporadic) • Execution Time: 2ms(max)

  7. Keypad • Scans keypad • Priority: 7 • Period: 10ms(sporadic) • Execution Time:~2.2us(max)

  8. CPU Load Lmax = 2ms + 2ms + 2.2us 200ms 20ms 10ms Lmax = .11 Lavg = .017

  9. Modules

  10. Data Flow Diagrams MultiAccessLock.c ProgEeprom.c LCD4Bit I/O User input Store Memory (user name & pin) Test data User prompts EEWordWrite() Unlock door

  11. MagFlag Data Flow Diagrams Magnetic Strip Reader Module MagReader I/O MultiAccessLock MagReadTask() MagReadInit() MagReadPost() MagKey

  12. KeyFlag Data Flow Diagrams Keypad Driver Module Keypad I/O MultiAccessLock KeyInit() KeyPend() KeyTask() key

  13. Questions or Comments?

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