CRC in LPC 2106?

Started by Sara...@ansaldo-signal.co.in February 11, 2008
Hi,
I am newbie to this field.
I am using LPC2106 microcontroller and KEIL microvision to develop
the application.
Is there any CRC calculation is implemented automatically?
How I can calculate the CRC for the different Hex output file.
Any one knows please brief about it.
Thanks & regards,
S.Saravanakumar

An Engineer's Guide to the LPC2100 Series

--- In l..., "Leon" wrote:
>
> ----- Original Message -----
> From:
> To:
> Sent: Monday, February 11, 2008 10:34 AM
> Subject: [lpc2000] CRC in LPC 2106?
> > Hi,
> > I am newbie to this field.
> > I am using LPC2106 microcontroller and KEIL microvision to
develop
> > the application.
> > Is there any CRC calculation is implemented automatically?
> > How I can calculate the CRC for the different Hex output file.
> > Any one knows please brief about it.
>
> Here's a 32-bit CRC I'm using with the LPC2148:
> /* Initialized first time "crc32()" is called. If you prefer, you can
> * statically initialize it at compile time. [Another exercise.]
> */
>
> u_long crc32(u_char *buf, int len)
> {
> u_char *p;
> u_long crc;
>
> if (!crc32_table[1]) /* if not already done, */
> init_crc32(); /* build table */
> crc = 0xffffffff; /* preload shift register, per
CRC-32 spec
> */
> for (p = buf; len > 0; ++p, --len)
> crc = (crc << 8) ^ crc32_table[(crc >> 24) ^ *p];
> return ~crc; /* transmit complement, per CRC-32
spec */
> }
>
> /*
> * Build auxiliary table for parallel byte-at-a-time CRC-32.
> */
> #define CRC32_POLY 0x04c11db7 /* AUTODIN II, Ethernet, & FDDI */
>
> init_crc32()
> {
> int i, j;
> u_long c;
>
> for (i = 0; i < 256; ++i) {
> for (c = i << 24, j = 8; j > 0; --j)
> c = c & 0x80000000 ? (c << 1) ^ CRC32_POLY :
(c <<
> 1);
> crc32_table[i] = c;
> }
> }
> I found it with Google, but I can't remember where.
>
> Leon
>

Hi,

U can use fnk with static crc32 table like this:
uint32_t CRC32(uint32_t qty, uint8_t *buf)
{
uint32_t i,crc32=0xFFFFFFFF;

for(i = 0; i < qty; i++)
crc32 = (crc32 >> 8) ^ crc32_tab[(crc32 & 0xff) ^ buf[i]];

return (crc32^=0xFFFFFFFF);
}

// crc32_tab

const uint32_t crc32_tab[256] {
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
};

Regards,
Slavo
----- Original Message -----
From:
To:
Sent: Monday, February 11, 2008 10:34 AM
Subject: [lpc2000] CRC in LPC 2106?
> Hi,
> I am newbie to this field.
> I am using LPC2106 microcontroller and KEIL microvision to develop
> the application.
> Is there any CRC calculation is implemented automatically?
> How I can calculate the CRC for the different Hex output file.
> Any one knows please brief about it.

Here's a 32-bit CRC I'm using with the LPC2148:
/* Initialized first time "crc32()" is called. If you prefer, you can
* statically initialize it at compile time. [Another exercise.]
*/

u_long crc32(u_char *buf, int len)
{
u_char *p;
u_long crc;

if (!crc32_table[1]) /* if not already done, */
init_crc32(); /* build table */
crc = 0xffffffff; /* preload shift register, per CRC-32 spec
*/
for (p = buf; len > 0; ++p, --len)
crc = (crc << 8) ^ crc32_table[(crc >> 24) ^ *p];
return ~crc; /* transmit complement, per CRC-32 spec */
}

/*
* Build auxiliary table for parallel byte-at-a-time CRC-32.
*/
#define CRC32_POLY 0x04c11db7 /* AUTODIN II, Ethernet, & FDDI */

init_crc32()
{
int i, j;
u_long c;

for (i = 0; i < 256; ++i) {
for (c = i << 24, j = 8; j > 0; --j)
c = c & 0x80000000 ? (c << 1) ^ CRC32_POLY : (c <<
1);
crc32_table[i] = c;
}
}
I found it with Google, but I can't remember where.

Leon
You need to check the CRC of HEX programming file or build a
communication protocol with your CRC check about data integrity?

Regards
Fabio Filippa


-----Messaggio originale-----
Da: S...@ansaldo-signal.co.in
[mailto:S...@ansaldo-signal.co.in]
Inviato: luned11 febbraio 2008 11.35
A: l...
Oggetto: [lpc2000] CRC in LPC 2106?

Hi,
I am newbie to this field.
I am using LPC2106 microcontroller and KEIL microvision to develop
the application.
Is there any CRC calculation is implemented automatically?
How I can calculate the CRC for the different Hex output file.
Any one knows please brief about it.

Thanks & regards,
S.Saravanakumar