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36 lines
1.1 KiB
36 lines
1.1 KiB
3 weeks ago
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/*
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* modbus_rtu.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_RTU_H__
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#define __MODBUS_RTU_H__
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#include "modbus_cfg.h"
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#include "modbus_pdu.h"
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#ifdef MB_USING_RTU_PROTOCOL
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#define MB_RTU_SADDR_SIZE 1 //RTU从机地址尺寸
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#define MB_RTU_CRC_SIZE 2
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#define MB_RTU_FRM_MIN (MB_RTU_SADDR_SIZE + MB_RTU_CRC_SIZE + MB_PDU_SIZE_MIN)
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#define MB_RTU_FRM_MAX (MB_RTU_SADDR_SIZE + MB_RTU_CRC_SIZE + MB_PDU_SIZE_MAX)
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#define MB_RTU_ADDR_BROADCAST 0 //广播地址
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#define MB_RTU_ADDR_MIN 1 //最小地址
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#define MB_RTU_ADDR_MAX 247 //最大地址
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#define MB_RTU_ADDR_DEF 1 //默认地址
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typedef struct{
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u8 saddr; //从机地址
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mb_pdu_t pdu; //pdu
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}mb_rtu_frm_t;//RTU帧定义
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int mb_rtu_frm_make(u8 *buf, const mb_rtu_frm_t *frm, mb_pdu_type_t type);//生成rtu帧, 返回帧长度
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int mb_rtu_frm_parse(const u8 *buf, int len, mb_rtu_frm_t *frm, mb_pdu_type_t type);//解析rtu帧, 返回pdu数据长度, 帧错误返回0, 功能码不支持返回-1
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#endif
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#endif
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