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336540 Design of Bio-Medical Virtual Instrumentation

336540 Design of Bio-Medical Virtual Instrumentation . Tutorial 2. Outline. Debugging techniques Structures: While loop For loop. Debugging Techniques. Broken VI. Debugging Techniques. Non broken VI

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336540 Design of Bio-Medical Virtual Instrumentation

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  1. 336540Design of Bio-Medical Virtual Instrumentation Tutorial 2

  2. Outline • Debugging techniques • Structures: • While loop • For loop

  3. Debugging Techniques • Broken VI

  4. Debugging Techniques • Non broken VI • Execution highlighting- generates an animation of the execution of the block diagram. • Single stepping • Breakpoints • Probe tools – helps checking intermediate values in a VI that produces unexpected results

  5. Exercise 1 1. What is the problem with the next diagram? 2. Fix the following VI:

  6. Structures

  7. While loop • Analog to: Repeat (code) ; Until Condition met; End; code No? Condition met? Yes end

  8. Iteration terminal – contains the number of completed iterations. Starts at zero. • Continue if true – the while loop executes its subdiagram until the condition teminalrecieves a FALSE value. • Stop if true - the while loop executes its subdiagram until the condition teminalrecieves a TRUE value. While loop always executes at least once!

  9. Structure Tunnels Tunnels feed data into and out of structures. The tunnel apears as a solid block on the border of the While loop. • What happens if we run the VI with a Boolean value of False?

  10. For loop • Analog to: N=100; i=0; Until i=N; Repeat(code); i=i+1; End; N=100 i=0 i=i+1 Code i=N? No? Yes end

  11. Iteration terminal – contains the number of completed iterations. Starts at zero. • Count terminal – input terminal whose value indicates how many times to repeat the subdiagram

  12. Conditional terminal to a for loop • You can add a conditional terminal to configure a For loop to stop when a Boolean condition is met or an error occurs. • The For loop will execute until the condition occurs OR until the all iterations are complete.

  13. Exercise 2 What will the indicator display after this program has run?

  14. Timing a VI • Wait until Next ms Multiple – monitors a millisecond counter and waits until the millisecond counter reaches a multiple of the amount you specify. • Wait (ms)- waits until the millisecond counter counts to an anount equal to the input. • Time elapsed- the amount of time elapses after the specified start time.

  15. Iterative Data Transfer – Shift Register Used when wanting to pass values from previous iterations through the loop to the next iterations.

  16. Exercise 3 • Create a VI which raffles a random number (between 0-1) in each iteration and compares it to the number from the last iterations • If the current random number is smaller than the previous one, stop the loop. • Returns the number of iterations.

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