/*
 * SPDX-FileCopyrightText: 2021-2023 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#pragma once

#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

/* ----------------------- Defines ------------------------------------------*/
#define MB_ADDRESS_BROADCAST    ( 0 )   /*! Modbus broadcast address. */
#define MB_ADDRESS_MIN          ( 1 )   /*! Smallest possible slave address. */
#define MB_ADDRESS_MAX          ( 247 ) /*! Biggest possible slave address. */

typedef enum _mb_commands_enum 
{
    MB_FUNC_NONE                        = (  0 ),
    MB_FUNC_READ_COILS                  = (  1 ),
    MB_FUNC_READ_DISCRETE_INPUTS        = (  2 ),
    MB_FUNC_WRITE_SINGLE_COIL           = (  5 ),
    MB_FUNC_WRITE_MULTIPLE_COILS        = ( 15 ),
    MB_FUNC_READ_HOLDING_REGISTER       = (  3 ),
    MB_FUNC_READ_INPUT_REGISTER         = (  4 ),
    MB_FUNC_WRITE_REGISTER              = (  6 ),
    MB_FUNC_WRITE_MULTIPLE_REGISTERS    = ( 16 ),
    MB_FUNC_READWRITE_MULTIPLE_REGISTERS= ( 23 ),
    MB_FUNC_DIAG_READ_EXCEPTION         = (  7 ),
    MB_FUNC_DIAG_DIAGNOSTIC             = (  8 ),
    MB_FUNC_DIAG_GET_COM_EVENT_CNT      = ( 11 ),
    MB_FUNC_DIAG_GET_COM_EVENT_LOG      = ( 12 ),
    MB_FUNC_OTHER_REPORT_SLAVEID        = ( 17 ),
    MB_FUNC_ERROR                       = ( 128U ),
} mb_commands_t;

/* ----------------------- Type definitions ---------------------------------*/

typedef enum
{
    MB_EX_NONE = 0x00,
    MB_EX_ILLEGAL_FUNCTION = 0x01,
    MB_EX_ILLEGAL_DATA_ADDRESS = 0x02,
    MB_EX_ILLEGAL_DATA_VALUE = 0x03,
    MB_EX_SLAVE_DEVICE_FAILURE = 0x04,
    MB_EX_ACKNOWLEDGE = 0x05,
    MB_EX_SLAVE_BUSY = 0x06,
    MB_EX_MEMORY_PARITY_ERROR = 0x08,
    MB_EX_GATEWAY_PATH_FAILED = 0x0A,
    MB_EX_GATEWAY_TGT_FAILED = 0x0B
} mb_exception_t;

typedef mb_exception_t (*mb_fn_handler_fp)(void *, uint8_t *frame_ptr, uint16_t *len_buf);

typedef struct
{
    uint8_t func_code;
    mb_fn_handler_fp handler;
} mb_fn_handler_t;

#ifdef __cplusplus
}
#endif