Collaboration diagram for CRC:
|
Functions | |
| u16 | crc16_ccitt (const u8 *buf, u32 len, u16 crc) |
| u32 | crc24q (const u8 *buf, u32 len, u32 crc) |
Variables | |
| static const u16 | crc16tab [256] |
| static const u32 | crc24qtab [256] |
Detailed Description
Cyclic redundancy checks.
Function Documentation
| u16 crc16_ccitt | ( | const u8 * | buf, |
| u32 | len, | ||
| u16 | crc | ||
| ) |
Calculate CCITT 16-bit Cyclical Redundancy Check (CRC16).
This implementation uses parameters used by XMODEM i.e. polynomial is:
![\[ x^{16} + x^{12} + x^5 + 1 \]](form_16.png)
Mask 0x11021, not reversed, not XOR'd (there are several slight variants on the CCITT CRC-16).
- Parameters:
-
buf Array of data to calculate CRC for len Length of data array crc Initial CRC value
- Returns:
- CRC16 value
![\[ x^{24} + x^{23} + x^{18} + x^{17} + x^{14} + x^{11} + x^{10} + x^7 + x^6 + x^5 + x^4 + x^3 + x+1 \]](form_17.png)