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6 - Benchmark

Considering that relays and circuit breakers demand short response times between the actual

error and the moment when the signal has been analysed, a benchmark is of great interest.

The model used for benchmarking

To test the system performance the model above was used. Within the first triggered

subsystem a 1000

order FIR-filter is started as the user pushes one of the buttons on the

hardware’s front plate. At the same time a timer-position is saved, this value is then compared

to the timer-position that is read the moment the calculations are done and the second

subsystem is triggered.

The calculations performed between the two timer-positions are shown in the code segment

shown below:

/* DiscreteFilter Block: '<S2>/Discrete Filter' */

{

int_T i;

const real_T *Amtx = &temp_P.DiscreteFilter_A[0];

real_T *x = &temp_DWork.DiscreteFilter_DSTATE[0];

real_T xtmp = temp_P.Constant_Value;

for (i=998; i>0; i--) {

xtmp += Amtx[i]*x[i];

x[i] = x[i-1];

}

x[0] = xtmp + Amtx[0]*x[0];

}

After a vast number of runs, the program consistently returns the timer-difference 540.

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MATLAB EMBEDDED IDE LINK 4 Guía de usuario Pagina 15