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250 lines
11 KiB
C
250 lines
11 KiB
C
/* Copyright 2018 Espressif Systems (Shanghai) PTE LTD
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _ESP_MB_MASTER_INTERFACE_H
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#define _ESP_MB_MASTER_INTERFACE_H
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#include <stdint.h> // for standard int types definition
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#include <stddef.h> // for NULL and std defines
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#include "soc/soc.h" // for BITN definitions
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#include "esp_modbus_common.h" // for common types
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*!
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* \brief Modbus descriptor table parameter type defines.
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*/
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typedef enum {
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PARAM_TYPE_U8 = 0x00, /*!< Unsigned 8 */
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PARAM_TYPE_U16 = 0x01, /*!< Unsigned 16 */
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PARAM_TYPE_U32 = 0x02, /*!< Unsigned 32 */
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PARAM_TYPE_FLOAT = 0x03, /*!< Float type */
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PARAM_TYPE_ASCII = 0x04 /*!< ASCII type */
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} mb_descr_type_t;
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/*!
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* \brief Modbus descriptor table parameter size in bytes.
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*/
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typedef enum {
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PARAM_SIZE_U8 = 0x01, /*!< Unsigned 8 */
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PARAM_SIZE_U16 = 0x02, /*!< Unsigned 16 */
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PARAM_SIZE_U32 = 0x04, /*!< Unsigned 32 */
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PARAM_SIZE_FLOAT = 0x04, /*!< Float size */
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PARAM_SIZE_ASCII = 0x08, /*!< ASCII size */
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PARAM_SIZE_ASCII24 = 0x18, /*!< ASCII24 size */
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PARAM_MAX_SIZE
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} mb_descr_size_t;
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/*!
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* \brief Modbus parameter options for description table
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*/
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typedef union {
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struct {
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int opt1; /*!< Parameter option1 */
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int opt2; /*!< Parameter option2 */
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int opt3; /*!< Parameter option3 */
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};
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struct {
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int min; /*!< Parameter minimum value */
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int max; /*!< Parameter maximum value */
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int step; /*!< Step of parameter change tracking */
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};
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} mb_parameter_opt_t;
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/**
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* @brief Permissions for the characteristics
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*/
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typedef enum {
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PAR_PERMS_READ = 1 << BIT0, /**< the characteristic of the device are readable */
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PAR_PERMS_WRITE = 1 << BIT1, /**< the characteristic of the device are writable*/
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PAR_PERMS_TRIGGER = 1 << BIT2, /**< the characteristic of the device are triggerable */
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PAR_PERMS_READ_WRITE = PAR_PERMS_READ | PAR_PERMS_WRITE, /**< the characteristic of the device are readable & writable */
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PAR_PERMS_READ_TRIGGER = PAR_PERMS_READ | PAR_PERMS_TRIGGER, /**< the characteristic of the device are readable & triggerable */
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PAR_PERMS_WRITE_TRIGGER = PAR_PERMS_WRITE | PAR_PERMS_TRIGGER, /**< the characteristic of the device are writable & triggerable */
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PAR_PERMS_READ_WRITE_TRIGGER = PAR_PERMS_READ_WRITE | PAR_PERMS_TRIGGER, /**< the characteristic of the device are readable & writable & triggerable */
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} mb_param_perms_t;
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/**
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* @brief Characteristics descriptor type is used to describe characteristic and
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* link it with Modbus parameters that reflect its data.
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*/
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typedef struct {
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uint16_t cid; /*!< Characteristic cid */
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const char* param_key; /*!< The key (name) of the parameter */
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const char* param_units; /*!< The physical units of the parameter */
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uint8_t mb_slave_addr; /*!< Slave address of device in the Modbus segment */
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mb_param_type_t mb_param_type; /*!< Type of modbus parameter */
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uint16_t mb_reg_start; /*!< This is the Modbus register address. This is the 0 based value. */
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uint16_t mb_size; /*!< Size of mb parameter in registers */
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uint16_t param_offset; /*!< Parameter name (OFFSET in the parameter structure) */
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mb_descr_type_t param_type; /*!< Float, U8, U16, U32, ASCII, etc. */
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mb_descr_size_t param_size; /*!< Number of bytes in the parameter. */
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mb_parameter_opt_t param_opts; /*!< Parameter options used to check limits and etc. */
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mb_param_perms_t access; /*!< Access permissions based on mode */
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} mb_parameter_descriptor_t;
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/**
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* @brief Modbus register request type structure
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*/
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typedef struct {
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uint8_t slave_addr; /*!< Modbus slave address */
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uint8_t command; /*!< Modbus command to send */
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uint16_t reg_start; /*!< Modbus start register */
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uint16_t reg_size; /*!< Modbus number of registers */
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} mb_param_request_t;
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// Master interface public functions
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/**
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* @brief Initialize Modbus controller and stack
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*
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* @param[out] handler handler(pointer) to master data structure
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* @param[in] port_type the type of port
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* @return
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* - ESP_OK Success
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* - ESP_ERR_NO_MEM Parameter error
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*/
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esp_err_t mbc_master_init(mb_port_type_t port_type, void** handler);
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/**
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* @brief Destroy Modbus controller and stack
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE Parameter error
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*/
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esp_err_t mbc_master_destroy(void);
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/**
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* @brief Start Modbus communication stack
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_ARG Modbus stack start error
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*/
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esp_err_t mbc_master_start(void);
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/**
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* @brief Set Modbus communication parameters for the controller
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*
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* @param comm_info Communication parameters structure.
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_ARG Incorrect parameter data
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*/
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esp_err_t mbc_master_setup(void* comm_info);
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/***************************** Specific interface functions ********************************************
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* Interface functions below provide basic methods to read/write access to slave devices in Modbus
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* segment as well as API to read specific supported characteristics linked to Modbus parameters
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* of devices in Modbus network.
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*******************************************************************************************************/
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/**
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* @brief Assign parameter description table for Modbus controller interface.
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*
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* @param[in] descriptor pointer to parameter description table
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* @param num_elements number of elements in the table
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*
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* @return
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* - esp_err_t ESP_OK - set descriptor successfully
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* - esp_err_t ESP_ERR_INVALID_ARG - invalid argument in function call
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*/
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esp_err_t mbc_master_set_descriptor(const mb_parameter_descriptor_t* descriptor, const uint16_t num_elements);
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/**
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* @brief Send data request as defined in parameter request, waits response
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* from slave and returns status of command execution. This function provides standard way
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* for read/write access to Modbus devices in the network.
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*
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* @param[in] request pointer to request structure of type mb_param_request_t
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* @param[in] data_ptr pointer to data buffer to send or received data (dependent of command field in request)
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*
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* @return
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* - esp_err_t ESP_OK - request was successful
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* - esp_err_t ESP_ERR_INVALID_ARG - invalid argument of function
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* - esp_err_t ESP_ERR_INVALID_RESPONSE - an invalid response from slave
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* - esp_err_t ESP_ERR_TIMEOUT - operation timeout or no response from slave
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* - esp_err_t ESP_ERR_NOT_SUPPORTED - the request command is not supported by slave
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* - esp_err_t ESP_FAIL - slave returned an exception or other failure
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*/
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esp_err_t mbc_master_send_request(mb_param_request_t* request, void* data_ptr);
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/**
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* @brief Get information about supported characteristic defined as cid. Uses parameter description table to get
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* this information. The function will check if characteristic defined as a cid parameter is supported
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* and returns its description in param_info. Returns ESP_ERR_NOT_FOUND if characteristic is not supported.
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*
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* @param[in] cid characteristic id
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* @param param_info pointer to pointer of characteristic data.
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*
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* @return
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* - esp_err_t ESP_OK - request was successful and buffer contains the supported characteristic name
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* - esp_err_t ESP_ERR_INVALID_ARG - invalid argument of function
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* - esp_err_t ESP_ERR_NOT_FOUND - the characteristic (cid) not found
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* - esp_err_t ESP_FAIL - unknown error during lookup table processing
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*/
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esp_err_t mbc_master_get_cid_info(uint16_t cid, const mb_parameter_descriptor_t** param_info);
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/**
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* @brief Read parameter from modbus slave device whose name is defined by name and has cid.
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* The additional data for request is taken from parameter description (lookup) table.
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*
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* @param[in] cid id of the characteristic for parameter
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* @param[in] name pointer into string name (key) of parameter (null terminated)
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* @param[out] value pointer to data buffer of parameter
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* @param[out] type parameter type associated with the name returned from parameter description table.
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*
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* @return
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* - esp_err_t ESP_OK - request was successful and value buffer contains
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* representation of actual parameter data from slave
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* - esp_err_t ESP_ERR_INVALID_ARG - invalid argument of function or parameter descriptor
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* - esp_err_t ESP_ERR_INVALID_RESPONSE - an invalid response from slave
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* - esp_err_t ESP_ERR_INVALID_STATE - invalid state during data processing or allocation failure
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* - esp_err_t ESP_ERR_TIMEOUT - operation timed out and no response from slave
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* - esp_err_t ESP_ERR_NOT_SUPPORTED - the request command is not supported by slave
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* - esp_err_t ESP_ERR_NOT_FOUND - the parameter is not found in the parameter description table
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* - esp_err_t ESP_FAIL - slave returned an exception or other failure
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*/
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esp_err_t mbc_master_get_parameter(uint16_t cid, char* name, uint8_t* value, uint8_t *type);
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/**
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* @brief Set characteristic's value defined as a name and cid parameter.
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* The additional data for cid parameter request is taken from master parameter lookup table.
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*
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* @param[in] cid id of the characteristic for parameter
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* @param[in] name pointer into string name (key) of parameter (null terminated)
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* @param[out] value pointer to data buffer of parameter (actual representation of json value field in binary form)
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* @param[out] type pointer to parameter type associated with the name returned from parameter lookup table.
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*
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* @return
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* - esp_err_t ESP_OK - request was successful and value was saved in the slave device registers
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* - esp_err_t ESP_ERR_INVALID_ARG - invalid argument of function or parameter descriptor
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* - esp_err_t ESP_ERR_INVALID_RESPONSE - an invalid response from slave during processing of parameter
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* - esp_err_t ESP_ERR_INVALID_STATE - invalid state during data processing or allocation failure
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* - esp_err_t ESP_ERR_TIMEOUT - operation timed out and no response from slave
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* - esp_err_t ESP_ERR_NOT_SUPPORTED - the request command is not supported by slave
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* - esp_err_t ESP_FAIL - slave returned an exception or other failure
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*/
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esp_err_t mbc_master_set_parameter(uint16_t cid, char* name, uint8_t* value, uint8_t *type);
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#ifdef __cplusplus
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}
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#endif
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#endif // _ESP_MB_MASTER_INTERFACE_H
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