Gaston Salazar-Silva / mydsc

# My Digital Signal Controller Library # The objective of MyDSC library is to implement controllers with help digital signal processors, digital signal controllers or mixed signals processors.

Dependents:   mydsc_sampling_example mydsc_sampling_example mydsc-serial-example mydsc-nonblocking-example

include/mydsc_ring_buffer.h@0:71de2d089e41, 2019-10-30 (annotated)

Committer:
ghsalazar
Date:
Wed Oct 30 17:25:37 2019 +0000
Revision:
0:71de2d089e41
Initial commit

Who changed what in which revision?

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ghsalazar 0:71de2d089e41 1 /* My Digital Signal Controller library
ghsalazar 0:71de2d089e41 2 * Copyright (c) 2019, Gastón H. SALAZAR-SILVA
ghsalazar 0:71de2d089e41 3 * SPDX-License-Identifier: Apache-2.0
ghsalazar 0:71de2d089e41 4 *
ghsalazar 0:71de2d089e41 5 * Licensed under the Apache License, Version 2.0 (the "License");
ghsalazar 0:71de2d089e41 6 * you may not use this file except in compliance with the License.
ghsalazar 0:71de2d089e41 7 *
ghsalazar 0:71de2d089e41 8 * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
ghsalazar 0:71de2d089e41 9 *
ghsalazar 0:71de2d089e41 10 * Unless required by applicable law or agreed to in writing, software
ghsalazar 0:71de2d089e41 11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
ghsalazar 0:71de2d089e41 12 * either express or implied.
ghsalazar 0:71de2d089e41 13 *
ghsalazar 0:71de2d089e41 14 * See the License for the specific language governing permissions and limitations under the License.
ghsalazar 0:71de2d089e41 15 */
ghsalazar 0:71de2d089e41 16
ghsalazar 0:71de2d089e41 17 #ifndef MYDSC_RING_BUFFER_H
ghsalazar 0:71de2d089e41 18 #define MYDSC_RING_BUFFER_H
ghsalazar 0:71de2d089e41 19
ghsalazar 0:71de2d089e41 20 #include <stdint.h>
ghsalazar 0:71de2d089e41 21
ghsalazar 0:71de2d089e41 22 #ifdef __cplusplus
ghsalazar 0:71de2d089e41 23 extern "C" {
ghsalazar 0:71de2d089e41 24 #endif
ghsalazar 0:71de2d089e41 25
ghsalazar 0:71de2d089e41 26 /**
ghsalazar 0:71de2d089e41 27 * @author Gastón H. SALAZAR-SILVA
ghsalazar 0:71de2d089e41 28 * @date 10/29/2019
ghsalazar 0:71de2d089e41 29 *
ghsalazar 0:71de2d089e41 30 * @brief This module.
ghsalazar 0:71de2d089e41 31 */
ghsalazar 0:71de2d089e41 32 typedef struct mydsc_ring_buffer {
ghsalazar 0:71de2d089e41 33 uint32_t max_position; /**< It is used as a mask for modular arithmetic. Its value should be 2^n - 1. */
ghsalazar 0:71de2d089e41 34 uint32_t index; /**< It is the actual position of the last element in the circular buffer. */
ghsalazar 0:71de2d089e41 35 float *samples; /**< The circular buffer is implemented as an array. this array is initializated with mydsc_ring_bufferinit. */
ghsalazar 0:71de2d089e41 36 } mydsc_ring_buffer_t;
ghsalazar 0:71de2d089e41 37
ghsalazar 0:71de2d089e41 38 /**
ghsalazar 0:71de2d089e41 39 * @brief Initialize a ring buffer.
ghsalazar 0:71de2d089e41 40 * @param prb a pointer to a ring buffer.
ghsalazar 0:71de2d089e41 41 * @param size the size of the samples array. Its value should be 2^n.
ghsalazar 0:71de2d089e41 42 * @return 0 on success, -1 on error.
ghsalazar 0:71de2d089e41 43 *
ghsalazar 0:71de2d089e41 44 * @author Gastón H. SALAZAR-SILVA
ghsalazar 0:71de2d089e41 45 * @date 10/29/2019
ghsalazar 0:71de2d089e41 46 */
ghsalazar 0:71de2d089e41 47 int mydsc_ring_buffer_init(mydsc_ring_buffer_t *prb, uint32_t size);
ghsalazar 0:71de2d089e41 48
ghsalazar 0:71de2d089e41 49 /**
ghsalazar 0:71de2d089e41 50 * @brief Push a value into a ring buffer.
ghsalazar 0:71de2d089e41 51 * @param ring a pointer to a ring buffer.
ghsalazar 0:71de2d089e41 52 * @param input a float to be pushed into the ring buffer.
ghsalazar 0:71de2d089e41 53 *
ghsalazar 0:71de2d089e41 54 * @author Gastón H. SALAZAR-SILVA
ghsalazar 0:71de2d089e41 55 * @date 10/29/2019
ghsalazar 0:71de2d089e41 56 */
ghsalazar 0:71de2d089e41 57 void mydsc_ring_buffer_push(mydsc_ring_buffer_t *ring, float input);
ghsalazar 0:71de2d089e41 58
ghsalazar 0:71de2d089e41 59 /**
ghsalazar 0:71de2d089e41 60 * @brief Return a pointer to a especific sample.
ghsalazar 0:71de2d089e41 61 * @param ring a pointer to a ring buffer.
ghsalazar 0:71de2d089e41 62 * @param pos an integer to indicate which sample to point. A negative value is expexted to past samples.
ghsalazar 0:71de2d089e41 63 *
ghsalazar 0:71de2d089e41 64 * @author Gastón H. SALAZAR-SILVA
ghsalazar 0:71de2d089e41 65 * @date 10/29/2019
ghsalazar 0:71de2d089e41 66 */
ghsalazar 0:71de2d089e41 67 static inline float* mydsc_ring_buffer_sample(mydsc_ring_buffer_t *ring, int32_t pos)
ghsalazar 0:71de2d089e41 68 {
ghsalazar 0:71de2d089e41 69 uint32_t n;
ghsalazar 0:71de2d089e41 70
ghsalazar 0:71de2d089e41 71 n = ring->index + pos;
ghsalazar 0:71de2d089e41 72 n &= ring->max_position;
ghsalazar 0:71de2d089e41 73 return &ring->samples[n];
ghsalazar 0:71de2d089e41 74 }
ghsalazar 0:71de2d089e41 75
ghsalazar 0:71de2d089e41 76 #ifdef __cplusplus
ghsalazar 0:71de2d089e41 77 }
ghsalazar 0:71de2d089e41 78 #endif
ghsalazar 0:71de2d089e41 79
ghsalazar 0:71de2d089e41 80 #define $(rb,n) *mydsc_ring_buffersample( &rb, n)
ghsalazar 0:71de2d089e41 81 #define $$(prb,n) *mydsc_ring_buffersample( prb, n)
ghsalazar 0:71de2d089e41 82
ghsalazar 0:71de2d089e41 83 #endif // MYDSC_RING_BUFFER_H