modbus_parser.h File Reference

Parser for Modbus. More...

#include "esp_err.h"
#include <stdbool.h>
#include <stdint.h>

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Macros
#define	MODBUS_PARSER_MINIMUM_FRAME_LENGTH   (4)

Functions
esp_err_t	modbus_parser_check_crc (const uint8_t *data_ptr, size_t length)
	Checks CRC16-Modbus of data validity.

Detailed Description

Parser for Modbus.

Author

Abanoub Salah

Provides CRC16 check abstraction for Modbus

Macro Definition Documentation

MODBUS_PARSER_MINIMUM_FRAME_LENGTH

#define MODBUS_PARSER_MINIMUM_FRAME_LENGTH   (4)

Minimum Modbus frame: |Address|Function|CRC16_Lo|CRC16_Hi|

Function Documentation

modbus_parser_check_crc()

esp_err_t modbus_parser_check_crc	(	const uint8_t *	data_ptr,
		size_t	length
	)

Checks CRC16-Modbus of data validity.

Parameters

data_ptr	Pointer to data
length	Data length

Returns

esp_err_t CRC check result

Return values

ESP_OK	CRC OK
ESP_ERR_INVALID_ARG	Provided invalid argument(s)
ESP_ERR_INVALID_SIZE	Data size invalid
ESP_ERR_INVALID_CRC	CRC invalid

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