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45 lines
1.3 KiB
45 lines
1.3 KiB
/////////////////////////////////////////////////////////////////////////////////
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//
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// modbus.h is part of TestModbus-Client.
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//
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/////////////////////////////////////////////////////////////////////////////////
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#ifndef _MODBUS_H_
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#define _MODBUS_H_
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#include <stdint.h>
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#include <stdlib.h>
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/*
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* this file will only contain the encoding and decoding functions
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*/
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struct {
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uint16_t transid; // transaction id
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uint16_t protid; // protocol id
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uint16_t length; // number of bytes followed
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uint8_t uid; // unit/slave id
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uint8_t fc; // function code
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uint16_t offset; // first register to read
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uint16_t number; // number of registers to read
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} typedef modbustcp_rq_header;
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struct {
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uint16_t transid; // transaction id
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uint16_t protid; // protocol id
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uint16_t length; // number of bytes followed
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uint8_t uid; // unit/slave id
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uint8_t fc; // function code
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uint8_t number; // number of registers to read
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} typedef modbustcp_res_header;
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char * modbustcp_pkt_headerrq (char *destbuffer, int bufsize, modbustcp_rq_header *srcmbh);
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char * modbustcp_unpkt_headerrq (modbustcp_rq_header *destmbh, char *srcbuffer, int bufsize);
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char * modbustcp_pkt_headerres (char *destbuffer, int bufsize, modbustcp_res_header *srcmbh);
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char * modbustcp_unpkt_headerres (modbustcp_res_header *destmbh, char *srcbuffer, int bufsize);
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#endif
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