Skip to content
GitLab
Explore
Sign in
Primary navigation
Search or go to…
Project
A
Arduino Core for SAMD21 CPU
Manage
Activity
Members
Labels
Plan
Issues
Issue boards
Milestones
Code
Merge requests
Repository
Branches
Commits
Tags
Repository graph
Compare revisions
Analyze
Value stream analytics
Contributor analytics
Repository analytics
Help
Help
Support
GitLab documentation
Compare GitLab plans
Community forum
Contribute to GitLab
Provide feedback
Keyboard shortcuts
?
Snippets
Groups
Projects
Show more breadcrumbs
josc941e
Arduino Core for SAMD21 CPU
Commits
6c53bbe4
Commit
6c53bbe4
authored
10 years ago
by
Cristian Maglie
Committed by
Cristian Maglie
10 years ago
Browse files
Options
Downloads
Patches
Plain Diff
Bootloader: added a more performant CRC function
parent
4c41dec5
No related branches found
Branches containing commit
No related tags found
Tags containing commit
No related merge requests found
Changes
2
Hide whitespace changes
Inline
Side-by-side
Showing
2 changed files
bootloaders/zero/usart_sam_ba.c
+36
-13
36 additions, 13 deletions
bootloaders/zero/usart_sam_ba.c
bootloaders/zero/usart_sam_ba.h
+5
-5
5 additions, 5 deletions
bootloaders/zero/usart_sam_ba.h
with
41 additions
and
18 deletions
bootloaders/zero/usart_sam_ba.c
+
36
−
13
View file @
6c53bbe4
...
...
@@ -203,24 +203,47 @@ uint32_t usart_getdata(void* data, uint32_t length) {
return
(
1
);
}
static
const
uint16_t
crc16Table
[
256
]
=
{
0x0000
,
0x1021
,
0x2042
,
0x3063
,
0x4084
,
0x50a5
,
0x60c6
,
0x70e7
,
0x8108
,
0x9129
,
0xa14a
,
0xb16b
,
0xc18c
,
0xd1ad
,
0xe1ce
,
0xf1ef
,
0x1231
,
0x0210
,
0x3273
,
0x2252
,
0x52b5
,
0x4294
,
0x72f7
,
0x62d6
,
0x9339
,
0x8318
,
0xb37b
,
0xa35a
,
0xd3bd
,
0xc39c
,
0xf3ff
,
0xe3de
,
0x2462
,
0x3443
,
0x0420
,
0x1401
,
0x64e6
,
0x74c7
,
0x44a4
,
0x5485
,
0xa56a
,
0xb54b
,
0x8528
,
0x9509
,
0xe5ee
,
0xf5cf
,
0xc5ac
,
0xd58d
,
0x3653
,
0x2672
,
0x1611
,
0x0630
,
0x76d7
,
0x66f6
,
0x5695
,
0x46b4
,
0xb75b
,
0xa77a
,
0x9719
,
0x8738
,
0xf7df
,
0xe7fe
,
0xd79d
,
0xc7bc
,
0x48c4
,
0x58e5
,
0x6886
,
0x78a7
,
0x0840
,
0x1861
,
0x2802
,
0x3823
,
0xc9cc
,
0xd9ed
,
0xe98e
,
0xf9af
,
0x8948
,
0x9969
,
0xa90a
,
0xb92b
,
0x5af5
,
0x4ad4
,
0x7ab7
,
0x6a96
,
0x1a71
,
0x0a50
,
0x3a33
,
0x2a12
,
0xdbfd
,
0xcbdc
,
0xfbbf
,
0xeb9e
,
0x9b79
,
0x8b58
,
0xbb3b
,
0xab1a
,
0x6ca6
,
0x7c87
,
0x4ce4
,
0x5cc5
,
0x2c22
,
0x3c03
,
0x0c60
,
0x1c41
,
0xedae
,
0xfd8f
,
0xcdec
,
0xddcd
,
0xad2a
,
0xbd0b
,
0x8d68
,
0x9d49
,
0x7e97
,
0x6eb6
,
0x5ed5
,
0x4ef4
,
0x3e13
,
0x2e32
,
0x1e51
,
0x0e70
,
0xff9f
,
0xefbe
,
0xdfdd
,
0xcffc
,
0xbf1b
,
0xaf3a
,
0x9f59
,
0x8f78
,
0x9188
,
0x81a9
,
0xb1ca
,
0xa1eb
,
0xd10c
,
0xc12d
,
0xf14e
,
0xe16f
,
0x1080
,
0x00a1
,
0x30c2
,
0x20e3
,
0x5004
,
0x4025
,
0x7046
,
0x6067
,
0x83b9
,
0x9398
,
0xa3fb
,
0xb3da
,
0xc33d
,
0xd31c
,
0xe37f
,
0xf35e
,
0x02b1
,
0x1290
,
0x22f3
,
0x32d2
,
0x4235
,
0x5214
,
0x6277
,
0x7256
,
0xb5ea
,
0xa5cb
,
0x95a8
,
0x8589
,
0xf56e
,
0xe54f
,
0xd52c
,
0xc50d
,
0x34e2
,
0x24c3
,
0x14a0
,
0x0481
,
0x7466
,
0x6447
,
0x5424
,
0x4405
,
0xa7db
,
0xb7fa
,
0x8799
,
0x97b8
,
0xe75f
,
0xf77e
,
0xc71d
,
0xd73c
,
0x26d3
,
0x36f2
,
0x0691
,
0x16b0
,
0x6657
,
0x7676
,
0x4615
,
0x5634
,
0xd94c
,
0xc96d
,
0xf90e
,
0xe92f
,
0x99c8
,
0x89e9
,
0xb98a
,
0xa9ab
,
0x5844
,
0x4865
,
0x7806
,
0x6827
,
0x18c0
,
0x08e1
,
0x3882
,
0x28a3
,
0xcb7d
,
0xdb5c
,
0xeb3f
,
0xfb1e
,
0x8bf9
,
0x9bd8
,
0xabbb
,
0xbb9a
,
0x4a75
,
0x5a54
,
0x6a37
,
0x7a16
,
0x0af1
,
0x1ad0
,
0x2ab3
,
0x3a92
,
0xfd2e
,
0xed0f
,
0xdd6c
,
0xcd4d
,
0xbdaa
,
0xad8b
,
0x9de8
,
0x8dc9
,
0x7c26
,
0x6c07
,
0x5c64
,
0x4c45
,
0x3ca2
,
0x2c83
,
0x1ce0
,
0x0cc1
,
0xef1f
,
0xff3e
,
0xcf5d
,
0xdf7c
,
0xaf9b
,
0xbfba
,
0x8fd9
,
0x9ff8
,
0x6e17
,
0x7e36
,
0x4e55
,
0x5e74
,
0x2e93
,
0x3eb2
,
0x0ed1
,
0x1ef0
};
//*----------------------------------------------------------------------------
//* \fn add_crc
//* \brief Compute the CRC
//*----------------------------------------------------------------------------
unsigned
short
add_crc
(
char
ptr
,
unsigned
short
crc
)
{
unsigned
short
cmpt
;
crc
=
crc
^
(
int
)
ptr
<<
8
;
for
(
cmpt
=
0
;
cmpt
<
8
;
cmpt
++
)
{
if
(
crc
&
0x8000
)
crc
=
crc
<<
1
^
CRC16POLY
;
else
crc
=
crc
<<
1
;
}
return
(
crc
&
0xFFFF
);
return
(
crc
<<
8
)
^
crc16Table
[((
crc
>>
8
)
^
ptr
)
&
0xff
];
}
//*----------------------------------------------------------------------------
...
...
This diff is collapsed.
Click to expand it.
bootloaders/zero/usart_sam_ba.h
+
5
−
5
View file @
6c53bbe4
...
...
@@ -142,13 +142,13 @@ uint32_t usart_putdata_xmd(void const* data, uint32_t length); //Send given data
uint32_t
usart_getdata_xmd
(
void
*
data
,
uint32_t
length
);
//Get data from comm. device using xmodem (if necessary)
/**
* \brief
Gets data from usart line using Xmodem protocol
* \brief
Compute the CRC
*
* \param
data pointer
* \param
number of data to get
* \return
value read on usart line
* \param
Char to add to CRC
* \param
Previous CRC
* \return
The new computed CRC
*/
unsigned
short
add_crc
(
char
ptr
,
unsigned
short
crc
);
unsigned
short
add_crc
(
char
c
,
unsigned
short
crc
);
uint8_t
getPacket
(
uint8_t
*
pData
,
uint8_t
sno
);
...
...
This diff is collapsed.
Click to expand it.
Preview
0%
Loading
Try again
or
attach a new file
.
Cancel
You are about to add
0
people
to the discussion. Proceed with caution.
Finish editing this message first!
Save comment
Cancel
Please
register
or
sign in
to comment