mifare.cpp File Reference

MIFARE definitions. More...

#include "mifare.hpp"
#include <cstring>

Namespaces
namespace	m5
	Top level namespace of M5stack.

Functions
bool	m5::nfc::a::mifare::classic::decode_value_block (int32_t &value, uint8_t &addr, const uint8_t buf[16])
	Decode the value of value block.
const uint8_t *	m5::nfc::a::mifare::classic::encode_value_block (uint8_t buf[16], const int32_t value, const uint8_t addr)
	Encode the value of value block.
bool	m5::nfc::a::mifare::classic::encode_access_bits (uint8_t abits[3], const uint8_t p0, const uint8_t p1, const uint8_t p2, const uint8_t p3)
	Encode access bits from permissions.
bool	m5::nfc::a::mifare::classic::decode_access_bits (uint8_t permissions[4], const uint8_t ab0, const uint8_t ab1, const uint8_t ab2)
	Decode access bits to permissions.

Detailed Description

MIFARE definitions.

Function Documentation

decode_access_bits()

bool m5::nfc::a::mifare::classic::decode_access_bits	(	uint8_t	permissions[4],
		const uint8_t	ab0,
		const uint8_t	ab1,
		const uint8_t	ab2 )

Decode access bits to permissions.

Parameters

permissions[4]	Output buffer at least 4 bytes
ab0	1st byte of the access bits
ab1	2nd byte of the access bits
ab2	3rd byte of the access bits

Returns

True if successful

Note

permissions[0] block 0

permissions[1] block 1

permissions[2] block 2

permissions[3] sector trailer

Warning

Return values should always be checked

decode_value_block()

bool m5::nfc::a::mifare::classic::decode_value_block	(	int32_t &	value,
		uint8_t &	addr,
		const uint8_t	buf[16] )

Decode the value of value block.

Parameters

[out]	value	Value
[out]	addr	Block address
	buf	Data of block(16 bytes)

Returns

True if successful

encode_access_bits()

bool m5::nfc::a::mifare::classic::encode_access_bits	(	uint8_t	abits[3],
		const uint8_t	p0,
		const uint8_t	p1,
		const uint8_t	p2,
		const uint8_t	p3 )

Encode access bits from permissions.

Parameters

abits[3]	Output buffer at least 3 bytes
p0	permissions for block 0
p1	permissions for block 1
p2	permissions for block 2
p3	permissions for sector tarailer

Returns

True if successful

Warning

Return values should always be checked

Writing incorrect access bits may make the sector inaccessible!

encode_value_block()

const uint8_t * m5::nfc::a::mifare::classic::encode_value_block	(	uint8_t	buf[16],
		const int32_t	value,
		const uint8_t	addr )

Encode the value of value block.

Parameters

[out]	buf	Output buffer at least 16 bytes
	value	Value
	addr	Block address

Returns

Encoded buffer