ecc-sw.h File Reference

Hamming ECC software implementation.

This file contains a software Hamming ECC implementation.

Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.

#include "compiler.h"

Macros
#define	HAMMING_ERROR_ECC   2
#define	HAMMING_ERROR_MULTIPLE_BITS   3
#define	HAMMING_ERROR_SINGLE_BIT   1
	These are the possible errors when trying to verify a block of data encoded using a Hamming code: More...

Functions
void	hamming_compute_256x (const uint8_t *puc_data, uint32_t dw_size, uint8_t *puc_code)
	Computes 3-bytes hamming codes for a data block whose size is multiple of 256 bytes. More...
uint32_t	hamming_verify_256x (uint8_t *puc_data, uint32_t dw_size, const uint8_t *puc_code)
	Verify 3-bytes hamming codes for a data block whose size is multiple of 256 bytes. More...

#define HAMMING_ERROR_ECC   2

Referenced by verify256().

#define HAMMING_ERROR_MULTIPLE_BITS   3

Referenced by verify256().

#define HAMMING_ERROR_SINGLE_BIT   1

These are the possible errors when trying to verify a block of data encoded using a Hamming code:

Errors

• HAMMING_ERROR_SINGLE_BIT
• HAMMING_ERROR_ECC
• HAMMING_ERROR_MULTIPLE_BITS

Referenced by hamming_verify_256x(), nand_flash_ecc_read_page(), and verify256().

void hamming_compute_256x	(	const uint8_t *	puc_data,
		uint32_t	dw_size,
		uint8_t *	puc_code
	)

Computes 3-bytes hamming codes for a data block whose size is multiple of 256 bytes.

Each 256 bytes block gets its own code.

Parameters

puc_data	Pointer to data to compute code for.
dw_size	Data size in bytes.
puc_code	Pointer to codes buffer.

References compute256().

Referenced by nand_flash_ecc_write_page().

uint32_t hamming_verify_256x	(	uint8_t *	puc_data,
		uint32_t	dw_size,
		const uint8_t *	puc_code
	)

Verify 3-bytes hamming codes for a data block whose size is multiple of 256 bytes.

Each 256-bytes block is verified with its own code.

Parameters

puc_data	Pointer to data buffer to verify.
dw_size	Size of the data in bytes.
puc_code	Pointer to original codes.

Returns

0 if the data is correct, HAMMING_ERROR_SINGLE_BIT if one or more block(s) have had a single bit corrected, or either HAMMING_ERROR_ECC or HAMMING_ERROR_MULTIPLE_BITS.

References HAMMING_ERROR_SINGLE_BIT, and verify256().

Referenced by nand_flash_ecc_read_page().