lightmodbus.c File Reference

Functions
uint8_t	modbusMaskRead (const uint8_t *mask, uint16_t maskLength, uint16_t bit)
	Reads n-th bit from an array. More...
uint8_t	modbusMaskWrite (uint8_t *mask, uint16_t maskLength, uint16_t bit, uint8_t value)
	Writes n-th bit in an array. More...
uint16_t	modbusCRC (const uint8_t *data, uint16_t length)
	Calculates 16-bit Modbus CRC of provided data. More...

Function Documentation

modbusCRC()

uint16_t modbusCRC	(	const uint8_t *	data,
		uint16_t	length
	)

Calculates 16-bit Modbus CRC of provided data.

Parameters

data	A pointer to the data to be processed
length	Number of bytes, starting at the data pointer, to process

Returns

16-bit Modbus CRC value

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modbusMaskRead()

uint8_t modbusMaskRead	(	const uint8_t *	mask,
		uint16_t	maskLength,
		uint16_t	bit
	)

Reads n-th bit from an array.

Parameters

mask	A pointer to the array
maskLength	The length of the array in bytes
bit	Number of the bit to be read

Returns

The bit value, or 255 if the bit lies outside the array.

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modbusMaskWrite()

uint8_t modbusMaskWrite	(	uint8_t *	mask,
		uint16_t	maskLength,
		uint16_t	bit,
		uint8_t	value
	)

Writes n-th bit in an array.

Parameters

mask	A pointer to the array
maskLength	The length of the array in bytes
bit	Number of the bit to write
value	Bit value to be written

Returns

Bit value on success, 255 if the bit lies outside the array.

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