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84 lines
2.8 KiB
C
84 lines
2.8 KiB
C
/* *****************************************************************************
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* circular_buffer.h 2014 AUG 23
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*
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* General Purpose Circular Buffer Function Set
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* Includes Circular Buffers for floats and shorts
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*
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* Created on: Aug 21, 2014
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* Author: Graham / KE9H
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*
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* *****************************************************************************
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*
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* Copyright (C) 2014 FlexRadio Systems.
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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**************************************************************************** */
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#ifndef CIRCULAR_BUFFER_H_
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#define CIRCULAR_BUFFER_H_
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#include <stdbool.h>
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/* Circular buffer objects */
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typedef struct {
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unsigned int size; // Maximum number of elements + 1
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unsigned int start; // Index of oldest element
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unsigned int end; // Index at which to write new element
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short *elems; // Vector of elements
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} circular_short_buffer, *Circular_Short_Buffer;
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typedef struct {
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unsigned int size; // Maximum number of elements + 1
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unsigned int start; // Index of oldest element
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unsigned int end; // Index at which to write new element
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float *elems; // Vector of elements
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} circular_float_buffer, *Circular_Float_Buffer;
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/* *****************************************************************************
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* Prototype Declarations
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*/
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// Returns TRUE if buffer is full
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bool cfbIsFull(Circular_Float_Buffer cb);
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bool csbIsFull(Circular_Short_Buffer cb);
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// Returns TRUE if buffer is empty
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bool cfbIsEmpty(Circular_Float_Buffer cb);
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bool csbIsEmpty(Circular_Short_Buffer cb);
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// Write an element, overwriting oldest element if buffer is full.
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// App can choose to avoid the overwrite by checking cbIsFull().
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void cbWriteFloat(Circular_Float_Buffer cb, float sample);
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void cbWriteShort(Circular_Short_Buffer cb, short sample);
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//Read oldest element. App must ensure !cbIsEmpty() first.
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float cbReadFloat(Circular_Float_Buffer cb);
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short cbReadShort(Circular_Short_Buffer cb);
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// Clear buffer
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void zero_cfb(Circular_Float_Buffer cb);
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void zero_csb(Circular_Short_Buffer cb);
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// Returns number of samples in buffer
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int cfbContains(Circular_Float_Buffer cb);
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int csbContains(Circular_Short_Buffer cb);
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#endif /* CIRCULAR_BUFFER_H_ */
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// EoF =====-----
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