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85 lines
2.4 KiB
85 lines
2.4 KiB
/**
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* TODO file description
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*
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* Created on 2022/01/02.
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*/
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#ifndef ESPNODE_MODBUS_FN_H
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#define ESPNODE_MODBUS_FN_H
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#include <stdint.h>
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#include <stddef.h>
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#include <stdbool.h>
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/**
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* Build "read holding registers" packet
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*
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* @param buf buf to write to
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* @param len buf len
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* @param resplen expected response length (if not exception)
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* @param mbAddr mb address
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* @param ref first register number
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* @param qty register quantity
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* @return number of buf bytes if success, negative if error
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*/
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int mb_build_fc3(uint8_t *buf, size_t len, size_t *resplen, uint8_t mbAddr, uint16_t ref, uint16_t qty);
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/**
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* Parse "read holding registers" response
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*
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* @param buf buf with the response bytes
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* @param len response buf len
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* @param dst store results here
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* @param capacity capacity of "dst"
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* @return num of results, negative if error
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*/
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int mb_parse_fc3(const uint8_t *buf, size_t len, uint16_t *dst, size_t capacity);
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/**
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* Build "read input registers" packet
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*
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* @param buf buf to write to
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* @param len buf len
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* @param resplen expected response length (if not exception)
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* @param mbAddr mb address
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* @param ref first register number
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* @param qty register quantity
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* @return number of buf bytes if success, negative if error
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*/
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int mb_build_fc4(uint8_t *buf, size_t len, size_t *resplen, uint8_t mbAddr, uint16_t ref, uint16_t qty);
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/**
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* Parse "read input registers" response
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*
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* @param buf buf with the response bytes
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* @param len response buf len
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* @param dst store results here
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* @param capacity capacity of "dst"
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* @return num of results, negative if error
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*/
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int mb_parse_fc4(const uint8_t *buf, size_t len, uint16_t *dst, size_t capacity);
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/**
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* Build "write holding registers" packet
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*
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* @param buf buf to write to
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* @param len buf len
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* @param resplen expected response length (if not exception)
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* @param mbAddr mb address
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* @param ref first register number
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* @param data register data to write, as an array
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* @param qty register quantity
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* @return number of buf bytes if success, negative if error
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*/
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int mb_build_fc16(uint8_t *buf, size_t len, size_t *resplen, uint8_t mbAddr, uint16_t ref, const uint16_t *data, uint16_t qty);
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/**
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* Parse "write holding registers" response
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*
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* @param buf buf with the response bytes
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* @param len response buf len
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* @return 0 if success, negative if error
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*/
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bool mb_parse_fc16(const uint8_t *buf, size_t len);
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#endif //ESPNODE_MODBUS_FN_H
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