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uint32_t | crc_itu32_calc (const uint8_t *buf, int len, uint32_t crc) |
| Calculate the ITU/CCITT CRC-32 value in buffer. More...
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int | crc_itu32_append (uint8_t *buf, int len) |
| Append an ITU/CCITT CRC-32 value to a frame. More...
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int | crc_itu32_check (const uint8_t *buf, int len) |
| Check the ITU/CCITT CRC-32 value in a frame. More...
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uint16_t | crc_itu16_calc (const uint8_t *buf, int len, uint16_t crc) |
| Calculate the ITU/CCITT CRC-16 value in buffer by whole bytes. More...
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uint16_t | crc_itu16_bits (uint8_t buf, int len, uint16_t crc) |
| Calculate the ITU/CCITT CRC-16 value of some bits from a byte. More...
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int | crc_itu16_append (uint8_t *buf, int len) |
| Append an ITU/CCITT CRC-16 value to a frame. More...
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int | crc_itu16_check (const uint8_t *buf, int len) |
| Check the ITU/CCITT CRC-16 value in a frame. More...
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◆ crc_itu16_append()
int crc_itu16_append |
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uint8_t * |
buf, |
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int |
len |
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) |
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Append an ITU/CCITT CRC-16 value to a frame.
- Parameters
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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.
◆ crc_itu16_bits()
uint16_t crc_itu16_bits |
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uint8_t |
buf, |
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int |
len, |
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uint16_t |
crc |
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) |
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Calculate the ITU/CCITT CRC-16 value of some bits from a byte.
- Parameters
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buf | The buffer containing the byte of data. |
len | The number of bits, starting from the LSB. |
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.
◆ crc_itu16_calc()
uint16_t crc_itu16_calc |
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const uint8_t * |
buf, |
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int |
len, |
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uint16_t |
crc |
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) |
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Calculate the ITU/CCITT CRC-16 value in buffer by whole bytes.
- 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.
Referenced by hdlc_tx_frame().
◆ crc_itu16_check()
int crc_itu16_check |
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const uint8_t * |
buf, |
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int |
len |
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) |
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Check the ITU/CCITT CRC-16 value in a frame.
- Parameters
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buf | The buffer containing the frame. |
len | The length of the frame. |
- Returns
- TRUE if the CRC is OK, else FALSE.
◆ crc_itu32_append()
int crc_itu32_append |
( |
uint8_t * |
buf, |
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int |
len |
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) |
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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.
◆ crc_itu32_calc()
uint32_t crc_itu32_calc |
( |
const uint8_t * |
buf, |
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int |
len, |
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uint32_t |
crc |
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) |
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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.
Referenced by hdlc_tx_frame().
◆ crc_itu32_check()
int crc_itu32_check |
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const uint8_t * |
buf, |
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int |
len |
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) |
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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.