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103 lines
2.9 KiB
103 lines
2.9 KiB
/**
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* Modbus slave
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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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// Config - TODO do this via cmake
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#define MB_SUPPORT_FC01 // READ_COILS
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#define MB_SUPPORT_FC02 // READ_DISCRETES
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#define MB_SUPPORT_FC03 // READ_HOLDING_REGISTERS
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#define MB_SUPPORT_FC04 // READ_INPUT_REGISTERS
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#define MB_SUPPORT_FC05 // WRITE_SINGLE_COIL
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#define MB_SUPPORT_FC06 // WRITE_SINGLE_REGISTER
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#define MB_SUPPORT_FC15 // WRITE_MULTIPLE_COILS
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#define MB_SUPPORT_FC16 // WRITE_MULTIPLE_REGISTERS
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#define MB_SUPPORT_FC22 // MASK_WRITE_REGISTER
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#define MB_SUPPORT_FC23 // READ_WRITE_MULTIPLE_REGISTERS
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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 = 2,
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MB_ERR_NEEDMORE = 3,
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MB_ERR_CHECKSUM = 4,
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MB_ERR_BADPROTO = 5,
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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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ModbusException_t (*startOfAccess)(ModbusSlave_t *ms, ModbusFunction_t fcx, uint8_t slave_id);
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void (*endOfAccess)(ModbusSlave_t *ms);
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#ifdef MB_SUPPORT_FC01
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ModbusException_t (*readCoil)(ModbusSlave_t *ms, uint16_t reference, bool *value);
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#endif
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#ifdef MB_SUPPORT_FC02
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ModbusException_t (*readDiscrete)(ModbusSlave_t *ms, uint16_t reference, bool *value);
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#endif
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#if defined(MB_SUPPORT_FC03) || defined(MB_SUPPORT_FC22) || defined(MB_SUPPORT_FC23)
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ModbusException_t (*readHolding)(ModbusSlave_t *ms, uint16_t reference, uint16_t *value);
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#endif
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#ifdef MB_SUPPORT_FC04
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ModbusException_t (*readInput)(ModbusSlave_t *ms, uint16_t reference, uint16_t *value);
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#endif
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#if defined(MB_SUPPORT_FC15) || defined(MB_SUPPORT_FC05)
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ModbusException_t (*writeCoil)(ModbusSlave_t *ms, uint16_t reference, bool value);
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#endif
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#if defined(MB_SUPPORT_FC06) || defined(MB_SUPPORT_FC16) || defined(MB_SUPPORT_FC22) || defined(MB_SUPPORT_FC23)
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ModbusException_t (*writeHolding)(ModbusSlave_t *ms, uint16_t reference, uint16_t value);
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#endif
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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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