48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
/**
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* @file pi.h
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* @note Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef HAVE_PI_H
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#define HAVE_PI_H
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#include "servo.h"
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/**
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* When set to a non-zero value, this variable determines the
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* proportional constant for the PI controller.
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*/
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extern double configured_pi_kp;
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/**
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* When set to a non-zero value, this variable determines the
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* integral constant for the PI controller.
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*/
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extern double configured_pi_ki;
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/**
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* When set to a non-zero value, this variable controls the maximum allowed
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* offset before a clock jump occurs instead of the default clock-slewing
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* mechanism
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*
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* Note that this variable is measured in seconds, and allows fractional values.
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*/
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extern double configured_pi_offset;
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struct servo *pi_servo_create(int fadj, int max_ppb, int sw_ts);
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#endif
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