src/temperature/pid.h

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/*
 * pid.h
 *
 * Copyright 2011 Pieter Agten
 *
 * This file is part of Yarf.
 *
 * Yarf is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Yarf is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Yarf.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef PID_H_
#define PID_H_

#include <stdint.h>

typedef struct {
  uint8_t envelope;   
  uint8_t p_gain;     
  uint8_t i_gain;     
  uint8_t d_gain;     
  float i_state;      
  float d_term;       
  float target_temp;  
  float last_temp;    
} pid_t;

void pid_init(pid_t *pid, uint8_t envelope, uint8_t p, uint8_t i, uint8_t d);

void pid_set_target(pid_t *pid, float target_temp);

uint8_t pid_next(pid_t *pid, float current_temp);

#endif //PID_H_