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84 lines
1.6 KiB
C
84 lines
1.6 KiB
C
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/**
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* @file agile_modbus_tcp.h
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* @brief Agile Modbus 软件包 TCP 头文件
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* @author 马龙伟 (2544047213@qq.com)
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* @date 2021-12-02
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*
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* @attention
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*
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* <h2><center>© Copyright (c) 2021 Ma Longwei.
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* All rights reserved.</center></h2>
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*
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*/
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#ifndef __PKG_AGILE_MODBUS_TCP_H
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#define __PKG_AGILE_MODBUS_TCP_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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/** @addtogroup TCP
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* @{
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*/
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/** @defgroup TCP_Exported_Constants TCP Exported Constants
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* @{
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*/
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#define AGILE_MODBUS_TCP_HEADER_LENGTH 7
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#define AGILE_MODBUS_TCP_PRESET_REQ_LENGTH 12
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#define AGILE_MODBUS_TCP_PRESET_RSP_LENGTH 8
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#define AGILE_MODBUS_TCP_CHECKSUM_LENGTH 0
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/**
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@verbatim
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Modbus_Application_Protocol_V1_1b.pdf Chapter 4 Section 1 Page 5
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TCP MODBUS ADU = 253 bytes + MBAP (7 bytes) = 260 bytes
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@endverbatim
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*/
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#define AGILE_MODBUS_TCP_MAX_ADU_LENGTH 260
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/**
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* @}
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*/
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/** @defgroup TCP_Exported_Types TCP Exported Types
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* @{
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*/
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/**
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* @brief TCP 结构体
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*/
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typedef struct agile_modbus_tcp {
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agile_modbus_t _ctx; /**< modbus 句柄 */
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uint16_t t_id; /**< Extract from MODBUS Messaging on TCP/IP Implementation Guide V1.0b
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(page 23/46):
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The transaction identifier is used to associate the future response
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with the request. This identifier is unique on each TCP connection. */
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} agile_modbus_tcp_t;
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/**
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* @}
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*/
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/** @addtogroup TCP_Exported_Functions
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* @{
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*/
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int agile_modbus_tcp_init(agile_modbus_tcp_t *ctx, uint8_t *send_buf, int send_bufsz, uint8_t *read_buf, int read_bufsz);
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/**
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* @}
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*/
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/**
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* @}
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*/
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#ifdef __cplusplus
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}
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#endif
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#endif
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