-
Notifications
You must be signed in to change notification settings - Fork 29
/
lfs_port_prv.c
81 lines (69 loc) · 2.69 KB
/
lfs_port_prv.c
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
74
75
76
77
78
79
80
81
/*
* FreeRTOS STM32 Reference Integration
*
* Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* 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.
*
* https://www.FreeRTOS.org
* https://github.com/FreeRTOS
*
*/
#include "FreeRTOS.h"
#include "semphr.h"
#include "lfs_util.h"
#include "lfs.h"
#include "lfs_port_prv.h"
int lfs_port_lock( const struct lfs_config * c )
{
struct LfsPortCtx * pxCtx = ( struct LfsPortCtx * ) c->context;
BaseType_t xReturnVal;
xReturnVal = xSemaphoreTake( pxCtx->xMutex, pxCtx->xBlockTime );
return ( int ) ( xReturnVal == pdTRUE ? 0 : -1 );
}
int lfs_port_unlock( const struct lfs_config * c )
{
struct LfsPortCtx * pxCtx = ( struct LfsPortCtx * ) c->context;
BaseType_t xReturnVal;
xReturnVal = xSemaphoreGive( pxCtx->xMutex );
return ( int ) ( xReturnVal == pdTRUE ? 0 : -1 );
}
/* The following function lfs_crc is derived from lfs_util.c and
* is available under the following terms:
* Copyright (c) 2017, Arm Limited. All rights reserved.
* SPDX-License-Identifier: BSD-3-Clause
*/
uint32_t lfs_crc( uint32_t crc,
const void * buffer,
size_t size )
{
static const uint32_t rtable[ 16 ] =
{
0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c,
};
const uint8_t * data = buffer;
for( size_t i = 0; i < size; i++ )
{
crc = ( crc >> 4 ) ^ rtable[ ( crc ^ ( data[ i ] >> 0 ) ) & 0xf ];
crc = ( crc >> 4 ) ^ rtable[ ( crc ^ ( data[ i ] >> 4 ) ) & 0xf ];
}
return crc;
}