The CMSIS DSP 5 library
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Diff: functions/ControllerFunctions/arm_pid_init_q31.c
- Revision:
- 1:24714b45cd1b
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/functions/ControllerFunctions/arm_pid_init_q31.c Wed Jun 20 11:21:31 2018 +0000 @@ -0,0 +1,95 @@ +/* ---------------------------------------------------------------------- + * Project: CMSIS DSP Library + * Title: arm_pid_init_q31.c + * Description: Q31 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 Q31 PID Control. + * @param[in,out] *S points to an instance of the Q31 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_q31( + arm_pid_instance_q31 * S, + int32_t resetStateFlag) +{ + +#if defined (ARM_MATH_DSP) + + /* Run the below code for Cortex-M4 and Cortex-M3 */ + + /* Derived coefficient A0 */ + S->A0 = __QADD(__QADD(S->Kp, S->Ki), S->Kd); + + /* Derived coefficient A1 */ + S->A1 = -__QADD(__QADD(S->Kd, S->Kd), S->Kp); + + +#else + + /* Run the below code for Cortex-M0 */ + + q31_t temp; + + /* Derived coefficient A0 */ + temp = clip_q63_to_q31((q63_t) S->Kp + S->Ki); + S->A0 = clip_q63_to_q31((q63_t) temp + S->Kd); + + /* Derived coefficient A1 */ + temp = clip_q63_to_q31((q63_t) S->Kd + S->Kd); + S->A1 = -clip_q63_to_q31((q63_t) temp + S->Kp); + +#endif /* #if defined (ARM_MATH_DSP) */ + + /* 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(q31_t)); + } + +} + +/** + * @} end of PID group + */