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74 lines
2.0 KiB
74 lines
2.0 KiB
3 years ago
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/**
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* TODO file description
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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 <stdbool.h>
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#include <sys/types.h>
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typedef enum ModbusException {
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MB_EXCEPTION_OK = 0,
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MB_EXCEPTION_ILLEGAL_FUNCTION = 1,
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MB_EXCEPTION_ILLEGAL_DATA_ADDRESS = 2,
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MB_EXCEPTION_ILLEGAL_DATA_VALUE = 3,
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MB_EXCEPTION_SLAVE_DEVICE_FAILURE = 4,
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// other codes exist but are not meaningful for simple slave devices
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} ModbusException_t;
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typedef enum ModbusFunction {
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FC01_READ_COILS = 1,
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FC02_READ_DISCRETES = 2,
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FC03_READ_HOLDING_REGISTERS = 3,
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FC04_READ_INPUT_REGISTERS = 4,
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FC05_WRITE_SINGLE_COIL = 5,
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FC06_WRITE_SINGLE_REGISTER = 6,
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FC15_WRITE_MULTIPLE_COILS = 15,
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FC16_WRITE_MULTIPLE_REGISTERS = 16,
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FC22_MASK_WRITE_REGISTER = 22,
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FC23_READ_WRITE_MULTIPLE_REGISTERS = 23,
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} ModbusFunction_t;
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typedef enum ModbusError {
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MB_OK = 0,
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MB_ERROR = 1,
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MB_ERR_NOTFORME,
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MB_ERR_NEEDMORE,
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MB_ERR_CHECKSUM,
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MB_ERR_BADPROTO,
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} ModbusError_t;
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typedef enum ModbusProtocol {
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MB_PROTO_RTU,
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MB_PROTO_TCP
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} ModbusProtocol_t;
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typedef struct ModbusSlave ModbusSlave_t;
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struct ModbusSlave {
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uint8_t addr;
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ModbusProtocol_t proto;
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void *userData;
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enum ModbusException (*startOfAccess)(ModbusSlave_t *ms, ModbusFunction_t fcx, uint8_t slave_id);
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void (*endOfAccess)(ModbusSlave_t *ms);
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enum ModbusException (*readCoil)(ModbusSlave_t *ms, uint16_t reference, bool *value);
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enum ModbusException (*readDiscrete)(ModbusSlave_t *ms, uint16_t reference, bool *value);
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enum ModbusException (*readHolding)(ModbusSlave_t *ms, uint16_t reference, uint16_t *value);
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enum ModbusException (*readInput)(ModbusSlave_t *ms, uint16_t reference, uint16_t *value);
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enum ModbusException (*writeCoil)(ModbusSlave_t *ms, uint16_t reference, bool value);
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enum ModbusException (*writeHolding)(ModbusSlave_t *ms, uint16_t reference, uint16_t value);
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};
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ModbusError_t mb_handleRequest(
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ModbusSlave_t *ms,
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const uint8_t *req,
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size_t req_size,
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uint8_t* resp,
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size_t resp_capacity,
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size_t *resp_size
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);
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#endif //MODBUS_H
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