IR Lamp Controller System Software Design And Documentation

1
IR Lamp Controller System Software Design And
Documentation

• Thomas Chia
• Western Washington University 2006-2007

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Kernel

• MicroC/OS-II preemptive multitasking kernel
• Tick Period of 1ms
• Bus frequency of 24Mhz
• Estimated Memory Requirements 2K, no paging

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Priority of Task/ISR

• 4)StartTask
• 5)Time Delay Task
• 6)IR key in Task
• 7)Key Task
• 8)Key Data Task
• 9)Key in Task
• 10)LED Display Task
• 11)Time Update Task
• Power Off ISR
• Zero Cross ISR
• RC5 Receive ISR

4
StartTask

• Initializes system
• Creates other Tasks
• Priority 4
• Period Once at start up
• Execution Time 1s

5
Time Delay Task

• Delays a certain amount of time every time a
  button is pressed
• Priority 5
• Execution period 50us
• Execution sporadic
• Worse case 50ms

6
IR Key in Task

• Processes a valid IR input
• Priority 6
• Execution time 50us
• Execution period sporadic
• Worse case 50ms

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Key Task

• Reads the manual input buttons
• Priority 7
• Execution time 15us
• Execution period 8ms

8
Key Data Task

• Validates the IR signal
• Priority 8
• Task execution time 50us
• Tast execution period sporadic
• Worse case 50ms

9
Key In Task

• Receives the manual inputs and executes the
  appropriate actions
• Priority 9
• Task execution time 50us
• Task execution period sporadic
• Worse case 50ms

10
LED Display Task

• Displays appropriate LED display value
• Priority 10
• Task execution time 25us
• Task execution period 5ms

11
Time Update Task

• Updates the current time
• Priority 11
• Task execution time 30us
• Task execution period 1s

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Power Off ISR

• Turns the power off when the sleep time is
  reached

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Zero Cross ISR

• Input capture ISR
• Sets the value of the output compare value

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RC5 Receive ISR

• Input capture ISR
• Validates and stores a valid IR data packet and
  signals the IR key in task to process the data

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Estimated Cpu Load

• LCpu 6

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Modules
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Modules Continued