recuperator fan control with esp32
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esp-recuperator/components/modbus_slave/include/modbus.h

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2.9 KiB

/**
* Modbus slave
*/
#ifndef MODBUS_H
#define MODBUS_H
#include <stdint.h>
#include <stdbool.h>
#include <sys/types.h>
// Config - TODO do this via cmake
//#define MB_SUPPORT_FC01 // READ_COILS
//#define MB_SUPPORT_FC02 // READ_DISCRETES
#define MB_SUPPORT_FC03 // READ_HOLDING_REGISTERS
//#define MB_SUPPORT_FC04 // READ_INPUT_REGISTERS
//#define MB_SUPPORT_FC05 // WRITE_SINGLE_COIL
#define MB_SUPPORT_FC06 // WRITE_SINGLE_REGISTER
//#define MB_SUPPORT_FC15 // WRITE_MULTIPLE_COILS
#define MB_SUPPORT_FC16 // WRITE_MULTIPLE_REGISTERS
//#define MB_SUPPORT_FC22 // MASK_WRITE_REGISTER
//#define MB_SUPPORT_FC23 // READ_WRITE_MULTIPLE_REGISTERS
typedef enum ModbusException {
MB_EXCEPTION_OK = 0,
MB_EXCEPTION_ILLEGAL_FUNCTION = 1,
MB_EXCEPTION_ILLEGAL_DATA_ADDRESS = 2,
MB_EXCEPTION_ILLEGAL_DATA_VALUE = 3,
MB_EXCEPTION_SLAVE_DEVICE_FAILURE = 4,
// other codes exist but are not meaningful for simple slave devices
} ModbusException_t;
typedef enum ModbusFunction {
FC01_READ_COILS = 1,
FC02_READ_DISCRETES = 2,
FC03_READ_HOLDING_REGISTERS = 3,
FC04_READ_INPUT_REGISTERS = 4,
FC05_WRITE_SINGLE_COIL = 5,
FC06_WRITE_SINGLE_REGISTER = 6,
FC15_WRITE_MULTIPLE_COILS = 15,
FC16_WRITE_MULTIPLE_REGISTERS = 16,
FC22_MASK_WRITE_REGISTER = 22,
FC23_READ_WRITE_MULTIPLE_REGISTERS = 23,
} ModbusFunction_t;
typedef enum ModbusError {
MB_OK = 0,
MB_ERROR = 1,
MB_ERR_NOTFORME = 2,
MB_ERR_NEEDMORE = 3,
MB_ERR_CHECKSUM = 4,
MB_ERR_BADPROTO = 5,
} ModbusError_t;
typedef enum ModbusProtocol {
MB_PROTO_RTU,
MB_PROTO_TCP
} ModbusProtocol_t;
typedef struct ModbusSlave ModbusSlave_t;
struct ModbusSlave {
uint8_t addr;
ModbusProtocol_t proto;
void *userData;
ModbusException_t (*startOfAccess)(ModbusSlave_t *ms, ModbusFunction_t fcx, uint8_t slave_id);
void (*endOfAccess)(ModbusSlave_t *ms);
#ifdef MB_SUPPORT_FC01
ModbusException_t (*readCoil)(ModbusSlave_t *ms, uint16_t reference, bool *value);
#endif
#ifdef MB_SUPPORT_FC02
ModbusException_t (*readDiscrete)(ModbusSlave_t *ms, uint16_t reference, bool *value);
#endif
#if defined(MB_SUPPORT_FC03) || defined(MB_SUPPORT_FC22) || defined(MB_SUPPORT_FC23)
ModbusException_t (*readHolding)(ModbusSlave_t *ms, uint16_t reference, uint16_t *value);
#endif
#ifdef MB_SUPPORT_FC04
ModbusException_t (*readInput)(ModbusSlave_t *ms, uint16_t reference, uint16_t *value);
#endif
#if defined(MB_SUPPORT_FC15) || defined(MB_SUPPORT_FC05)
ModbusException_t (*writeCoil)(ModbusSlave_t *ms, uint16_t reference, bool value);
#endif
#if defined(MB_SUPPORT_FC06) || defined(MB_SUPPORT_FC16) || defined(MB_SUPPORT_FC22) || defined(MB_SUPPORT_FC23)
ModbusException_t (*writeHolding)(ModbusSlave_t *ms, uint16_t reference, uint16_t value);
#endif
};
ModbusError_t mb_handleRequest(
ModbusSlave_t *ms,
const uint8_t *req,
size_t req_size,
uint8_t* resp,
size_t resp_capacity,
size_t *resp_size
);
#endif //MODBUS_H