[GitHub] [incubator-nuttx] raiden00pl commented on a change in pull request #3244: Improvements for libdsp and support for fixed16 libdsp implementation

[GitBox <gi...@apache.org>]

raiden00pl commented on a change in pull request #3244:
URL: https://github.com/apache/incubator-nuttx/pull/3244#discussion_r604254627



##########
File path: include/dspb16.h
##########
@@ -0,0 +1,480 @@
+/****************************************************************************
+ * include/dspb16.h
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you 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
+ *
+ *   http://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.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_DSPB16_H
+#define __INCLUDE_DSPB16_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/compiler.h>
+
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdbool.h>
+#include <fixedmath.h>
+
+#include <assert.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Disable DEBUGASSERT macro if LIBDSP debug is not enabled */
+
+#ifdef CONFIG_LIBDSP_DEBUG
+#  ifndef CONFIG_DEBUG_ASSERTIONS
+#    warning "Need CONFIG_DEBUG_ASSERTIONS to work properly"
+#  endif
+#  define LIBDSP_DEBUGASSERT(x) DEBUGASSERT(x)
+#else
+#  undef LIBDSP_DEBUGASSERT
+#  define LIBDSP_DEBUGASSERT(x)
+#endif
+
+#ifndef CONFIG_LIBDSP_PRECISION
+#  define CONFIG_LIBDSP_PRECISION 0
+#endif
+
+/* Phase rotation direction */
+
+#define DIR_NONE_B16 ftob16(0.0f)
+#define DIR_CW_B16   ftob16(1.0f)
+#define DIR_CCW_B16  ftob16(-1.0f)
+
+/* Some math constants ******************************************************/
+
+#define SQRT3_BY_TWO_B16     ftob16(0.866025f)
+#define SQRT3_BY_THREE_B16   ftob16(0.57735f)
+#define ONE_BY_SQRT3_B16     ftob16(0.57735f)
+#define TWO_BY_SQRT3_B16     ftob16(1.15470f)
+
+/* Some lib constants *******************************************************/
+
+/* Motor electrical angle is in range 0.0 to 2*PI */
+
+#define MOTOR_ANGLE_E_MAX_B16    (b16TWOPI)
+#define MOTOR_ANGLE_E_MIN_B16    (0)
+#define MOTOR_ANGLE_E_RANGE_B16  (MOTOR_ANGLE_E_MAX_B16 - MOTOR_ANGLE_E_MIN_B16)
+
+/* Motor mechanical angle is in range 0.0 to 2*PI */
+
+#define MOTOR_ANGLE_M_MAX_B16    (b16TWOPI)
+#define MOTOR_ANGLE_M_MIN_B16    (0)
+#define MOTOR_ANGLE_M_RANGE_B16  (MOTOR_ANGLE_M_MAX_B16 - MOTOR_ANGLE_M_MIN_B16)
+
+/* Some useful macros *******************************************************/
+
+/****************************************************************************
+ * Name: LP_FILTER_B16
+ *
+ * Description:
+ *   Simple single-pole digital low pass filter:
+ *     Y(n) = (1-beta)*Y(n-1) + beta*X(n) = (beta * (Y(n-1) - X(n)))
+ *
+ *     filter - (0.0 - 1.0) where 1.0 gives unfiltered values
+ *     filter = T * (2*PI) * f_c
+ *
+ *     phase shift = -arctan(f_in/f_c)
+ *
+ *     T    - period at which the digital filter is being calculated
+ *     f_in - input frequency of the filter
+ *     f_c  - cutoff frequency of the filter
+ *
+ * REFERENCE: https://www.embeddedrelated.com/showarticle/779.php
+ *
+ ****************************************************************************/
+
+#define LP_FILTER_B16(val, sample, filter) val -= (b16mulb16(filter, (val - sample)))
+
+/****************************************************************************
+ * Name: SVM3_BASE_VOLTAGE_GET_B16
+ *
+ * Description:
+ *  Get maximum voltage for SVM3 without overmodulation
+ *
+ *  Notes:
+ *   max possible phase voltage for 3-phase power inwerter:

Review comment:
       done




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