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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_pid_init_f32.c
* Description: Floating-point PID Control initialization function
*
* $Date: 27. January 2017
* $Revision: V.1.5.1
*
* Target Processor: Cortex-M cores
* -------------------------------------------------------------------- */
/*
* Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the License); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "arm_math.h"
/**
* @addtogroup PID
* @{
*/
/**
* @brief Initialization function for the floating-point PID Control.
* @param[in,out] *S points to an instance of the PID structure.
* @param[in] resetStateFlag flag to reset the state. 0 = no change in state & 1 = reset the state.
* @return none.
* \par Description:
* \par
* The <code>resetStateFlag</code> specifies whether to set state to zero or not. \n
* The function computes the structure fields: <code>A0</code>, <code>A1</code> <code>A2</code>
* using the proportional gain( \c Kp), integral gain( \c Ki) and derivative gain( \c Kd)
* also sets the state variables to all zeros.
*/
void arm_pid_init_f32(
arm_pid_instance_f32 * S,
int32_t resetStateFlag)
{
/* Derived coefficient A0 */
S->A0 = S->Kp + S->Ki + S->Kd;
/* Derived coefficient A1 */
S->A1 = (-S->Kp) - ((float32_t) 2.0 * S->Kd);
/* Derived coefficient A2 */
S->A2 = S->Kd;
/* Check whether state needs reset or not */
if (resetStateFlag)
{
/* Clear the state buffer. The size will be always 3 samples */
memset(S->state, 0, 3U * sizeof(float32_t));
}
}
/**
* @} end of PID group
*/
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