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40 lines
1.2 KiB
40 lines
1.2 KiB
4 weeks ago
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/*
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* modbus_tcp.h
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*
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* Change Logs:
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* Date Author Notes
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* 2024-04-01 qiyongzhong first version
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*/
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#ifndef __MODBUS_TCP_H__
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#define __MODBUS_TCP_H__
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4 weeks ago
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#include "modbus_cfg.h"
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#include "modbus_pdu.h"
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4 weeks ago
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#ifdef MB_USING_TCP_PROTOCOL
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#define MB_TCP_MBAP_SIZE 7 //MBAP头尺寸
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#define MB_TCP_FRM_MIN (MB_TCP_MBAP_SIZE + MB_PDU_SIZE_MIN)
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#define MB_TCP_FRM_MAX (MB_TCP_MBAP_SIZE + MB_PDU_SIZE_MAX)
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#define MB_TCP_MBAP_PID 0x0000//使用的协议类型代码
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typedef struct{
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u16 tid; //传输标识符, 响应须与请求一致
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u16 pid; //协议类型, 响应须与请求一致
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u16 dlen; //等于pdu数据长度加1, 打包时会自动计算处理不需人工赋值
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u8 did; //逻辑设备ID, 响应须与请求一致
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}mb_tcp_mbap_t;//TCP协议MBAP头定义
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typedef struct{
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mb_tcp_mbap_t mbap;//MBAP头
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mb_pdu_t pdu;//PDU数据
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}mb_tcp_frm_t;//TCP帧定义
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int mb_tcp_frm_make(u8 *buf, const mb_tcp_frm_t *frm, mb_pdu_type_t type);//生成tcp帧, 返回帧长度
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int mb_tcp_frm_parse(const u8 *buf, int len, mb_tcp_frm_t *frm, mb_pdu_type_t type);//解析tcp帧, 返回pdu数据长度, 解析失败返回0, 功能码不支持返回-1
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#endif
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#endif
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