valueoverperiod.c

来自「包括常规PID、NOTCH、LAG2 等函数的实现方法」· C语言 代码 · 共 43 行

#include "utils.h"

// iOp
// 0 : min
// 1 : max

float ValueOverPeriod (float In, struct tValueOverPeriod *D)
{
	int i;
	float rVal;

	if (D->Duration > D->DT*0.5)
	{
		if (D->Init == 0)
		{
			D->Nbuf = NINT(D->Duration/D->DT);
			// UTILS_BUFFER_LENGTH D->Buffer = (float *)calloc(D->Nbuf, sizeof(float));
			for (i=0; i<D->Nbuf; i++) D->Buffer[i] = In;
			D->iPos = 0;
			D->Init = 1;
		}

		D->Buffer[D->iPos] = In;
		D->iPos++;
		if (D->iPos >= D->Nbuf) D->iPos = 0;

		rVal = D->Buffer[0];
		switch (D->iOp)
		{
		case 0:
			for (i=1; i<D->Nbuf; i++)
				if (D->Buffer[i] < rVal) rVal = D->Buffer[i];
			break;
		case 1:
			for (i=1; i<D->Nbuf; i++)
				if (D->Buffer[i] > rVal) rVal = D->Buffer[i];
			break;
		}
		return(rVal);
	}
	else return(In);
}