N K / Mbed 2 deprecated priustroller_2

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Dependencies:   mbed

Fork of priustroller by Bayley Wang

meta/pidcontroller.cpp

Committer:
bwang
Date:
2015-03-08
Revision:
11:dccbaa9274c5
Child:
21:da41c08e51bc

File content as of revision 11:dccbaa9274c5:

#include "includes.h"
#include "filters.h"

PidController::PidController(float ki, float kp, float kd, float out_max, float out_min) {
    _ki = ki;
    _kp = kp;
    _kd = kd;
    _last_in = 0.0f;
    _integral = 0.0f;
    _out_max = out_max;
    _out_min = out_min;
}

float PidController::Update(float ref, float in) {
    float error = ref - in;
    _integral += error;
    if (_integral * _ki > _out_max) _integral = _out_max / _ki;
    if (_integral * _ki < _out_min) _integral = _out_min / _ki;
    float deriv = _last_in - in;
    _last_in = in;
    float tmp = _ki * _integral + _kp * error + _kd * deriv;
    if (tmp > _out_max) tmp = _out_max;
    if (tmp < _out_min) tmp = _out_min;
    return tmp;
}