Collaboration diagram for RTU Private Functions:

Functions
static uint16_t	agile_modbus_rtu_crc16 (uint8_t *buffer, uint16_t buffer_length)
	RTU CRC16 calculation. More...

static int	agile_modbus_rtu_set_slave (agile_modbus_t *ctx, int slave)
	RTU sets the address interface. More...

static int	agile_modbus_rtu_build_request_basis (agile_modbus_t ctx, int function, int addr, int nb, uint8_t req)
	RTU builds the basic request message interface (header message) More...

static int	agile_modbus_rtu_build_response_basis (agile_modbus_sft_t sft, uint8_t rsp)
	RTU builds the basic response message interface (header message) More...

static int	agile_modbus_rtu_prepare_response_tid (const uint8_t req, int req_length)
	RTU ready response interface. More...

static int	agile_modbus_rtu_send_msg_pre (uint8_t *req, int req_length)
	RTU pre-send data interface. More...

static int	agile_modbus_rtu_check_integrity (agile_modbus_t ctx, uint8_t msg, const int msg_length)
	RTU check received data integrity interface (CRC16 comparison) More...

static int	agile_modbus_rtu_pre_check_confirmation (agile_modbus_t ctx, const uint8_t req, const uint8_t *rsp, int rsp_length)
	RTU pre-check confirmation interface (request response address comparison) More...

Detailed Description

Function Documentation

◆ agile_modbus_rtu_crc16()

static uint16_t agile_modbus_rtu_crc16	(	uint8_t *	buffer,
		uint16_t	buffer_length
	)

static

RTU CRC16 calculation.

Parameters

buffer	data pointer
buffer_length	data length

Returns: CRC16 value

Definition at line 100 of file agile_modbus_rtu.c.

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◆ agile_modbus_rtu_set_slave()

static int agile_modbus_rtu_set_slave	(	agile_modbus_t *	ctx,
		int	slave
	)

static

RTU sets the address interface.

Parameters

ctx	modbus handle
slave	slave address

Returns: 0: success

Definition at line 122 of file agile_modbus_rtu.c.

◆ agile_modbus_rtu_build_request_basis()

static int agile_modbus_rtu_build_request_basis	(	agile_modbus_t *	ctx,
		int	function,
		int	addr,
		int	nb,
		uint8_t *	req
	)

static

RTU builds the basic request message interface (header message)

Parameters

ctx	modbus handle
function	function code
addr	register address
nb	number of registers
req	data storage pointer

Returns: data length

Definition at line 137 of file agile_modbus_rtu.c.

◆ agile_modbus_rtu_build_response_basis()

static int agile_modbus_rtu_build_response_basis	(	agile_modbus_sft_t *	sft,
		uint8_t *	rsp
	)

static

RTU builds the basic response message interface (header message)

Parameters

sft	modbus header parameter structure pointer
rsp	data storage pointer

Returns: data length

Definition at line 157 of file agile_modbus_rtu.c.

◆ agile_modbus_rtu_prepare_response_tid()

static int agile_modbus_rtu_prepare_response_tid	(	const uint8_t *	req,
		int *	req_length
	)

static

RTU ready response interface.

Note: This API will automatically subtract the AGILE_MODBUS_RTU_CHECKSUM_LENGTH length from req_length

Parameters

req	request data pointer
req_length	request data length

Returns: 0 (RTU has no transaction identifier)

Definition at line 172 of file agile_modbus_rtu.c.

◆ agile_modbus_rtu_send_msg_pre()

static int agile_modbus_rtu_send_msg_pre	(	uint8_t *	req,
		int	req_length
	)

static

RTU pre-send data interface.

Note: This API will calculate CRC16 and automatically fill in the tail

Parameters

req	data storage pointer
req_length	existing data length

Returns: data length

Definition at line 187 of file agile_modbus_rtu.c.

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◆ agile_modbus_rtu_check_integrity()

static int agile_modbus_rtu_check_integrity	(	agile_modbus_t *	ctx,
		uint8_t *	msg,
		const int	msg_length
	)

static

RTU check received data integrity interface (CRC16 comparison)

Parameters

ctx	modbus handle
msg	Receive data pointer
msg_length	valid data length

Returns: >0: valid data length; others: exception

Definition at line 203 of file agile_modbus_rtu.c.

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◆ agile_modbus_rtu_pre_check_confirmation()

static int agile_modbus_rtu_pre_check_confirmation	(	agile_modbus_t *	ctx,
		const uint8_t *	req,
		const uint8_t *	rsp,
		int	rsp_length
	)

static

RTU pre-check confirmation interface (request response address comparison)

Note: If the request address is broadcast address 0, return success

Parameters

ctx	modbus handle
req	request data pointer
rsp	response data pointer
rsp_length	response data length

Returns: 0: success; others: exception

Definition at line 227 of file agile_modbus_rtu.c.