You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
74 lines
2.1 KiB
74 lines
2.1 KiB
//
|
|
// This is a circular buffer implementation borrowed from the DAPLink firmware
|
|
//
|
|
|
|
/**
|
|
* @file circ_buf.h
|
|
* @brief Implementation of a circular buffer
|
|
*
|
|
* DAPLink Interface Firmware
|
|
* Copyright (c) 2016-2016, ARM Limited, 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
|
|
*
|
|
* 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 CIRC_BUF_H
|
|
#define CIRC_BUF_H
|
|
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
typedef struct {
|
|
uint32_t head;
|
|
uint32_t tail;
|
|
uint32_t size;
|
|
uint8_t *buf;
|
|
} circ_buf_t;
|
|
|
|
// Initialize or reinitialize a circular buffer
|
|
void circ_buf_init(circ_buf_t *circ_buf, uint8_t *buffer, uint32_t size);
|
|
|
|
// Push a byte into the circular buffer
|
|
void circ_buf_push(circ_buf_t *circ_buf, uint8_t data);
|
|
|
|
// Return a byte from the circular buffer
|
|
uint8_t circ_buf_pop(circ_buf_t *circ_buf);
|
|
|
|
// try to read the buffer, return false if empty
|
|
bool circ_buf_pop_try(circ_buf_t *circ_buf, uint8_t *data);
|
|
|
|
// try to write the buffer, return false if full
|
|
bool circ_buf_push_try(circ_buf_t *circ_buf, uint8_t data);
|
|
|
|
// Get the number of bytes in the circular buffer
|
|
uint32_t circ_buf_count_used(circ_buf_t *circ_buf);
|
|
|
|
// Get the number of free spots left in the circular buffer
|
|
uint32_t circ_buf_count_free(circ_buf_t *circ_buf);
|
|
|
|
// Attempt to read size bytes from the buffer. Return the number of bytes read
|
|
uint32_t circ_buf_read(circ_buf_t *circ_buf, uint8_t *data, uint32_t size);
|
|
|
|
// Attempt to write size bytes to the buffer. Return the number of bytes written
|
|
uint32_t circ_buf_write(circ_buf_t *circ_buf, const uint8_t *data, uint32_t size);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|
|
|