esp-idf/components/freemodbus/common/include/esp_modbus_slave.h
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C

/* Copyright 2018 Espressif Systems (Shanghai) PTE LTD
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _ESP_MB_SLAVE_INTERFACE_H
#define _ESP_MB_SLAVE_INTERFACE_H
// Public interface header for slave
#include <stdint.h> // for standard int types definition
#include <stddef.h> // for NULL and std defines
#include "soc/soc.h" // for BITN definitions
#include "freertos/FreeRTOS.h" // for task creation and queues access
#include "freertos/event_groups.h" // for event groups
#include "esp_modbus_common.h" // for common types
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Parameter access event information type
*/
typedef struct {
uint32_t time_stamp; /*!< Timestamp of Modbus Event (uS)*/
uint16_t mb_offset; /*!< Modbus register offset */
mb_event_group_t type; /*!< Modbus event type */
uint8_t* address; /*!< Modbus data storage address */
size_t size; /*!< Modbus event register size (number of registers)*/
} mb_param_info_t;
/**
* @brief Parameter storage area descriptor
*/
typedef struct {
uint16_t start_offset; /*!< Modbus start address for area descriptor */
mb_param_type_t type; /*!< Type of storage area descriptor */
void* address; /*!< Instance address for storage area descriptor */
size_t size; /*!< Instance size for area descriptor (bytes) */
} mb_register_area_descriptor_t;
/**
* @brief Initialize Modbus Slave controller and stack for TCP port
*
* @param[out] handler handler(pointer) to master data structure
* @return
* - ESP_OK Success
* - ESP_ERR_NO_MEM Parameter error
* - ESP_ERR_NOT_SUPPORTED Port type not supported
* - ESP_ERR_INVALID_STATE Initialization failure
*/
esp_err_t mbc_slave_init_tcp(void** handler);
/**
* @brief Initialize Modbus Slave controller and stack for Serial port
*
* @param[out] handler handler(pointer) to master data structure
* @param[in] port_type the type of port
* @return
* - ESP_OK Success
* - ESP_ERR_NO_MEM Parameter error
* - ESP_ERR_NOT_SUPPORTED Port type not supported
* - ESP_ERR_INVALID_STATE Initialization failure
*/
esp_err_t mbc_slave_init(mb_port_type_t port_type, void** handler);
/**
* @brief Initialize Modbus Slave controller interface handle
*
* @param[in] handler - pointer to slave interface data structure
*/
void mbc_slave_init_iface(void* handler);
/**
* @brief Destroy Modbus controller and stack
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_STATE Parameter error
*/
esp_err_t mbc_slave_destroy(void);
/**
* @brief Start Modbus communication stack
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Modbus stack start error
*/
esp_err_t mbc_slave_start(void);
/**
* @brief Set Modbus communication parameters for the controller
*
* @param comm_info Communication parameters structure.
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Incorrect parameter data
*/
esp_err_t mbc_slave_setup(void* comm_info);
/**
* @brief Wait for specific event on parameter change.
*
* @param group Group event bit mask to wait for change
*
* @return
* - mb_event_group_t event bits triggered
*/
mb_event_group_t mbc_slave_check_event(mb_event_group_t group);
/**
* @brief Get parameter information
*
* @param[out] reg_info parameter info structure
* @param timeout Timeout in milliseconds to read information from
* parameter queue
* @return
* - ESP_OK Success
* - ESP_ERR_TIMEOUT Can not get data from parameter queue
* or queue overflow
*/
esp_err_t mbc_slave_get_param_info(mb_param_info_t* reg_info, uint32_t timeout);
/**
* @brief Set Modbus area descriptor
*
* @param descr_data Modbus registers area descriptor structure
*
* @return
* - ESP_OK: The appropriate descriptor is set
* - ESP_ERR_INVALID_ARG: The argument is incorrect
*/
esp_err_t mbc_slave_set_descriptor(mb_register_area_descriptor_t descr_data);
#ifdef __cplusplus
}
#endif
#endif