crc.h File Reference

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Functions

uint32_t crc_itu32_calc (const uint8_t *buf, int len, uint32_t crc)
 Calculate the ITU/CCITT CRC-32 value in buffer.
int crc_itu32_append (uint8_t *buf, int len)
 Append an ITU/CCITT CRC-32 value to a frame.
int crc_itu32_check (const uint8_t *buf, int len)
 Check the ITU/CCITT CRC-32 value in a frame.
uint16_t crc_itu16_calc (const uint8_t *buf, int len, uint16_t crc)
 Calculate the ITU/CCITT CRC-16 value in buffer.
int crc_itu16_append (uint8_t *buf, int len)
 Append an ITU/CCITT CRC-16 value to a frame.
int crc_itu16_check (const uint8_t *buf, int len)
 Check the ITU/CCITT CRC-16 value in a frame.


Detailed Description


Function Documentation

int crc_itu16_append uint8_t *  buf,
int  len
 

Append an ITU/CCITT CRC-16 value to a frame.

Parameters:
buf The buffer containing the frame. This must be at least 2 bytes longer than the frame it contains, to allow room for the CRC value.
len The length of the frame.
Returns:
The new length of the frame.

uint16_t crc_itu16_calc const uint8_t *  buf,
int  len,
uint16_t  crc
 

Calculate the ITU/CCITT CRC-16 value in buffer.

Parameters:
buf The buffer containing the data.
len The length of the frame.
crc The initial CRC value. This is usually 0xFFFF, or 0 for a new block (it depends on the application). It is previous returned CRC value for the continuation of a block.
Returns:
The CRC value.

int crc_itu16_check const uint8_t *  buf,
int  len
 

Check the ITU/CCITT CRC-16 value in a frame.

Parameters:
buf The buffer containing the frame.
len The length of the frame.
Returns:
TRUE if the CRC is OK, else FALSE.

int crc_itu32_append uint8_t *  buf,
int  len
 

Append an ITU/CCITT CRC-32 value to a frame.

Parameters:
buf The buffer containing the frame. This must be at least 2 bytes longer than the frame it contains, to allow room for the CRC value.
len The length of the frame.
Returns:
The new length of the frame.

uint32_t crc_itu32_calc const uint8_t *  buf,
int  len,
uint32_t  crc
 

Calculate the ITU/CCITT CRC-32 value in buffer.

Parameters:
buf The buffer containing the data.
len The length of the frame.
crc The initial CRC value. This is usually 0xFFFFFFFF, or 0 for a new block (it depends on the application). It is previous returned CRC value for the continuation of a block.
Returns:
The CRC value.

int crc_itu32_check const uint8_t *  buf,
int  len
 

Check the ITU/CCITT CRC-32 value in a frame.

Parameters:
buf The buffer containing the frame.
len The length of the frame.
Returns:
TRUE if the CRC is OK, else FALSE.


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