Bayley Wang / Mbed 2 deprecated priustroller_3

temp repo

Dependencies:   mbed

Fork of priustroller_2 by N K

meta/pidcontroller.cpp@11:dccbaa9274c5, 2015-03-08 (annotated)

Committer:
bwang
Date:
Sun Mar 08 08:37:38 2015 +0000
Revision:
11:dccbaa9274c5
Child:
21:da41c08e51bc
--Initial Commit: 03-08-2015 new context-based code; no more timers (=easier debugging)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bwang 11:dccbaa9274c5 1 #include "includes.h"
bwang 11:dccbaa9274c5 2 #include "filters.h"
bwang 11:dccbaa9274c5 3
bwang 11:dccbaa9274c5 4 PidController::PidController(float ki, float kp, float kd, float out_max, float out_min) {
bwang 11:dccbaa9274c5 5 _ki = ki;
bwang 11:dccbaa9274c5 6 _kp = kp;
bwang 11:dccbaa9274c5 7 _kd = kd;
bwang 11:dccbaa9274c5 8 _last_in = 0.0f;
bwang 11:dccbaa9274c5 9 _integral = 0.0f;
bwang 11:dccbaa9274c5 10 _out_max = out_max;
bwang 11:dccbaa9274c5 11 _out_min = out_min;
bwang 11:dccbaa9274c5 12 }
bwang 11:dccbaa9274c5 13
bwang 11:dccbaa9274c5 14 float PidController::Update(float ref, float in) {
bwang 11:dccbaa9274c5 15 float error = ref - in;
bwang 11:dccbaa9274c5 16 _integral += error;
bwang 11:dccbaa9274c5 17 if (_integral * _ki > _out_max) _integral = _out_max / _ki;
bwang 11:dccbaa9274c5 18 if (_integral * _ki < _out_min) _integral = _out_min / _ki;
bwang 11:dccbaa9274c5 19 float deriv = _last_in - in;
bwang 11:dccbaa9274c5 20 _last_in = in;
bwang 11:dccbaa9274c5 21 float tmp = _ki * _integral + _kp * error + _kd * deriv;
bwang 11:dccbaa9274c5 22 if (tmp > _out_max) tmp = _out_max;
bwang 11:dccbaa9274c5 23 if (tmp < _out_min) tmp = _out_min;
bwang 11:dccbaa9274c5 24 return tmp;
bwang 11:dccbaa9274c5 25 }