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Lost Item Pager System Design Russ Kinley 5/6/6008.

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Presentation on theme: "Lost Item Pager System Design Russ Kinley 5/6/6008."— Presentation transcript:

1 Lost Item Pager System Design Russ Kinley 5/6/6008

2 MCU Choice Base: Base: MC13213 MC13213 16 MHz 16 MHz Micro C/OS Micro C/OS 8KB ROM (flash) 8KB ROM (flash) 2KB RAM 2KB RAM Pagers: Pagers: MC13211 MC13211 16 MHz 16 MHz Time-slice Kernel Time-slice Kernel 2KB ROM (flash) 2KB ROM (flash) 100 Bytes RAM 100 Bytes RAM

3 Tasks (Base) 4. Start Task 5. Button Press Task 6. Send Receive Task 7. Display Task 8. Count Task

4 Start Task Initializes system Initializes system Creates other tasks Creates other tasks Priority: 4 Priority: 4 Period: run-once Period: run-once Execution Time: 1sec Execution Time: 1sec

5 Button Press Task Detects a valid button press Detects a valid button press Priority: 5 Priority: 5 Period: 10ms Period: 10ms Execution time: 20usec Execution time: 20usec

6 Send Receive Task Sends start/stop page messages Sends start/stop page messages Reads return messages from Pagers Reads return messages from Pagers Priority:6 Priority:6 Period: 1sec Period: 1sec Execution time: 10msec Execution time: 10msec

7 Display Task Determines which message is displayed Determines which message is displayed Displays all messages on LCD Displays all messages on LCD Priority: 7 Priority: 7 Period: 1sec Period: 1sec Execution time: 10msec Execution time: 10msec

8 Count Task Used as a timer for Display Task’s display Used as a timer for Display Task’s display Priority: 8 Priority: 8 Period: 1sec Period: 1sec Execution time: 10usec Execution time: 10usec

9 CPU Load (Base) TaskExecution (ms)Period (ms)Load Start100 Button0.02100.002 Send/Receive1010000.01 Display1010000.01 Count0.0110000.00001 Max: 0.02201 Average: 0.012

10 Base Modules Main: Start Task, Display Task, Count Task Main: Start Task, Display Task, Count Task LCD: (no tasks) LCD: (no tasks) Button: Button Press Task Button: Button Press Task Wireless: Send Receive Task Wireless: Send Receive Task

11 Data Flow Diagram (Base)

12 Pager Tasks Start Task Start Task Wake-up Task Wake-up Task Send Receive Task Send Receive Task Button Press Task Button Press Task Beep Task Beep Task

13 Start Task Initializes device upon reset Initializes device upon reset Period: run once Period: run once Execution time: 1 sec Execution time: 1 sec

14 Wake-Up Task Uses an RTI to awaken the pager from sleep mode. Uses an RTI to awaken the pager from sleep mode. Period: 20msec(timeslice period) Period: 20msec(timeslice period) Execution time: 10usec Execution time: 10usec Holds pager awake for 1sec and in sleep for 14sec to help not to miss a signal and wait longer for a response and conserve battery. Holds pager awake for 1sec and in sleep for 14sec to help not to miss a signal and wait longer for a response and conserve battery.

15 Button Press Task Detects a valid button press Detects a valid button press Signals others tasks to end function Signals others tasks to end function Period: 20msec (when active) Period: 20msec (when active) Execution time: 10usec Execution time: 10usec

16 Beep Task Turns on/off LEDs and speaker with a 50% duty cycle overall. Turns on/off LEDs and speaker with a 50% duty cycle overall. Period: 100usec Period: 100usec Execution time: 10usec Execution time: 10usec

17 Send Receive Task Receives signals from Base, determines if signal is intended from that device. Receives signals from Base, determines if signal is intended from that device. Returns acknowledge signals to Base Returns acknowledge signals to Base Period: 500msec (25 time-slice periods) Period: 500msec (25 time-slice periods) Execution time: 1msec (send), 15msec (receive) Execution time: 1msec (send), 15msec (receive)

18 CPU Load TaskExecution (ms)Period (ms)Load Start100000 Button0.01100.001 Send Receive0.1100.01 Beep0.010.1 Wakeup0.1150006.67E-06 Max: 0.111007 average: 0.011007

19 Data Flow Diagram

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