Official ARM version: v5.6.0HEADmaster

1 files changed, 21 insertions, 24 deletions

diff --git a/DSP/Source/ControllerFunctions/arm_pid_init_q31.c b/DSP/Source/ControllerFunctions/arm_pid_init_q31.c
index 17b3b09..1625a5f 100644
--- a/DSP/Source/ControllerFunctions/arm_pid_init_q31.c
+++ b/DSP/Source/ControllerFunctions/arm_pid_init_q31.c
@@ -3,13 +3,13 @@
  * Title:        arm_pid_init_q31.c
  * Description:  Q31 PID Control initialization function
  *
- * $Date:        27. January 2017
- * $Revision:    V.1.5.1
+ * $Date:        18. March 2019
+ * $Revision:    V1.6.0
  *
  * Target Processor: Cortex-M cores
  * -------------------------------------------------------------------- */
 /*
- * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
+ * Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved.
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -28,22 +28,24 @@
 
 #include "arm_math.h"
 
- /**
- * @addtogroup PID
- * @{
+/**
+  @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.
+  @brief         Initialization function for the Q31 PID Control.
+  @param[in,out] S               points to an instance of the Q31 PID structure
+  @param[in]     resetStateFlag
+                   - value = 0: no change in state
+                   - value = 1: reset state
+  @return        none
+
+  @par           Details
+                   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(
@@ -53,20 +55,15 @@ void arm_pid_init_q31(
 
 #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;
+  q31_t temp;                                    /* to store the sum */
 
   /* Derived coefficient A0 */
   temp = clip_q63_to_q31((q63_t) S->Kp + S->Ki);
@@ -84,12 +81,12 @@ void arm_pid_init_q31(
   /* Check whether state needs reset or not */
   if (resetStateFlag)
   {
-    /* Clear the state buffer.  The size will be always 3 samples */
+    /* Reset state to zero, The size will be always 3 samples */
     memset(S->state, 0, 3U * sizeof(q31_t));
   }
 
 }
 
 /**
- * @} end of PID group
+  @} end of PID group
  */