1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2019 Jim Mussared
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "ringbuf.h"
int ringbuf_get16(ringbuf_t *r) {
int v = ringbuf_peek16(r);
if (v == -1) {
return v;
}
r->iget += 2;
if (r->iget >= r->size) {
r->iget -= r->size;
}
return v;
}
int ringbuf_peek16(ringbuf_t *r) {
if (r->iget == r->iput) {
return -1;
}
uint32_t iget_a = r->iget + 1;
if (iget_a == r->size) {
iget_a = 0;
}
if (iget_a == r->iput) {
return -1;
}
return (r->buf[r->iget] << 8) | (r->buf[iget_a]);
}
int ringbuf_put16(ringbuf_t *r, uint16_t v) {
uint32_t iput_a = r->iput + 1;
if (iput_a == r->size) {
iput_a = 0;
}
if (iput_a == r->iget) {
return -1;
}
uint32_t iput_b = iput_a + 1;
if (iput_b == r->size) {
iput_b = 0;
}
if (iput_b == r->iget) {
return -1;
}
r->buf[r->iput] = (v >> 8) & 0xff;
r->buf[iput_a] = v & 0xff;
r->iput = iput_b;
return 0;
}
|
