AN2512 datasheet(32/38 Pages) STMICROELECTRONICS

32 / 38 page

Example of source code

AN2512

32/38

if (e->quant[3] > 0xf0000000) //for test purpose

e->quant[3] = 0;

e->quot[3] = e->quant[3] >> 4;

Temp = e->quant[3] & 0x0f;//save the residue

e->frac[3] += Temp;

Accuracy_Error_Count ++;

if (Accuracy_Error_Count == 3){

Accuracy_Error_Count = 0;

if (e->quant[0] >= 2)

e->quant[0] -= 2;

}

led_frac += e->quant[0] & 0x0f;

e->quot[2] = e->quot[1];

e->quot[1] = e->quot[0];

e->quot[0] = e->quant[0] >> 4;

}

/*--------------------------------------------------------------------------------

ROUTINE NAME : EnergyUpdate

INPUT/OUTPUT : None/None

DESCRIPTION

: Energy update function (version for signed energy integration)If quant

is negative, subtract otherwise add its value from the integrator. Returns true when

frac reaches ELIMIT

---------------------------------------------------------------------------------*/

int EnergyUpdate(void)

{

PM_u8 i;

e = &ActWB;

// active WB energy calculation

for (i = 0; i < 3; i++){

e->frac[i] += (Long int)e->quot[i];// add quot to frac

if (e->quant[i] < 0){

// is quant negative?

if (e->frac[i] > (-ELIMIT))

return(0);

// yes, is within the limit?

else {

e->frac[i] += ELIMIT;

(e->integ[i])--;

// no, subtract it and increment

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