CSCE 4620 RealTime Operating Systems

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CSCE 4620 Real-Time Operating Systems

• Richard Goodrum

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Chapter 5

• Time Management

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Functions Covered
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Time Related Macros
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Chapter 18

• PC Services

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Display Address Calculation
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Display Functions
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Design Example
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Traffic Intersection Simulator

• Without actual sensors,
• Use high priority tasks to generate simulated
  interrupts
• On random delays
• By resuming the suspended simulated ISRs.
• Use slightly lower priority tasks to simulate
  ISRs.
• Keep on LONG delays
• Use even lower priority tasks to test signal
  light control.
• A portion of traffic in each direction will turn
  left without the benefit of a protecting left
  turn signal.

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Simulated Interrupts

• void SimulateInterrupt( void arg )
• int delay
• for()
• delay random( 100 )
• OSTimeDly( delay )
• OSTimeDlyResume( arg )

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Simulated ISR

• void SimulatedISR( void arg )
• for()
• OSTimeDly ( 65535 )
• OSIntEnter()
• // Do appropriate ISR operations
• OSIntExit()