/* 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_MASTER_INTERFACE_H #define _ESP_MB_MASTER_INTERFACE_H #include // for standard int types definition #include // for NULL and std defines #include "soc/soc.h" // for BITN definitions #include "esp_modbus_common.h" // for common types #ifdef __cplusplus extern "C" { #endif /*! * \brief Modbus descriptor table parameter type defines. */ typedef enum { PARAM_TYPE_U8 = 0x00, /*!< Unsigned 8 */ PARAM_TYPE_U16 = 0x01, /*!< Unsigned 16 */ PARAM_TYPE_U32 = 0x02, /*!< Unsigned 32 */ PARAM_TYPE_FLOAT = 0x03, /*!< Float type */ PARAM_TYPE_ASCII = 0x04 /*!< ASCII type */ } mb_descr_type_t; /*! * \brief Modbus descriptor table parameter size in bytes. */ typedef enum { PARAM_SIZE_U8 = 0x01, /*!< Unsigned 8 */ PARAM_SIZE_U16 = 0x02, /*!< Unsigned 16 */ PARAM_SIZE_U32 = 0x04, /*!< Unsigned 32 */ PARAM_SIZE_FLOAT = 0x04, /*!< Float size */ PARAM_SIZE_ASCII = 0x08, /*!< ASCII size */ PARAM_SIZE_ASCII24 = 0x18, /*!< ASCII24 size */ PARAM_MAX_SIZE } mb_descr_size_t; /*! * \brief Modbus parameter options for description table */ typedef union { struct { int opt1; /*!< Parameter option1 */ int opt2; /*!< Parameter option2 */ int opt3; /*!< Parameter option3 */ }; struct { int min; /*!< Parameter minimum value */ int max; /*!< Parameter maximum value */ int step; /*!< Step of parameter change tracking */ }; } mb_parameter_opt_t; /** * @brief Permissions for the characteristics */ typedef enum { PAR_PERMS_READ = 1 << BIT0, /**< the characteristic of the device are readable */ PAR_PERMS_WRITE = 1 << BIT1, /**< the characteristic of the device are writable*/ PAR_PERMS_TRIGGER = 1 << BIT2, /**< the characteristic of the device are triggerable */ PAR_PERMS_READ_WRITE = PAR_PERMS_READ | PAR_PERMS_WRITE, /**< the characteristic of the device are readable & writable */ PAR_PERMS_READ_TRIGGER = PAR_PERMS_READ | PAR_PERMS_TRIGGER, /**< the characteristic of the device are readable & triggerable */ PAR_PERMS_WRITE_TRIGGER = PAR_PERMS_WRITE | PAR_PERMS_TRIGGER, /**< the characteristic of the device are writable & triggerable */ PAR_PERMS_READ_WRITE_TRIGGER = PAR_PERMS_READ_WRITE | PAR_PERMS_TRIGGER, /**< the characteristic of the device are readable & writable & triggerable */ } mb_param_perms_t; /** * @brief Characteristics descriptor type is used to describe characteristic and * link it with Modbus parameters that reflect its data. */ typedef struct { uint16_t cid; /*!< Characteristic cid */ const char* param_key; /*!< The key (name) of the parameter */ const char* param_units; /*!< The physical units of the parameter */ uint8_t mb_slave_addr; /*!< Slave address of device in the Modbus segment */ mb_param_type_t mb_param_type; /*!< Type of modbus parameter */ uint16_t mb_reg_start; /*!< This is the Modbus register address. This is the 0 based value. */ uint16_t mb_size; /*!< Size of mb parameter in registers */ uint16_t param_offset; /*!< Parameter name (OFFSET in the parameter structure) */ mb_descr_type_t param_type; /*!< Float, U8, U16, U32, ASCII, etc. */ mb_descr_size_t param_size; /*!< Number of bytes in the parameter. */ mb_parameter_opt_t param_opts; /*!< Parameter options used to check limits and etc. */ mb_param_perms_t access; /*!< Access permissions based on mode */ } mb_parameter_descriptor_t; /** * @brief Modbus register request type structure */ typedef struct { uint8_t slave_addr; /*!< Modbus slave address */ uint8_t command; /*!< Modbus command to send */ uint16_t reg_start; /*!< Modbus start register */ uint16_t reg_size; /*!< Modbus number of registers */ } mb_param_request_t; // Master interface public functions /** * @brief Initialize Modbus controller and stack * * @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_t mbc_master_init(mb_port_type_t port_type, void** handler); /** * @brief Destroy Modbus controller and stack * * @return * - ESP_OK Success * - ESP_ERR_INVALID_STATE Parameter error */ esp_err_t mbc_master_destroy(void); /** * @brief Start Modbus communication stack * * @return * - ESP_OK Success * - ESP_ERR_INVALID_ARG Modbus stack start error */ esp_err_t mbc_master_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_master_setup(void* comm_info); /***************************** Specific interface functions ******************************************** * Interface functions below provide basic methods to read/write access to slave devices in Modbus * segment as well as API to read specific supported characteristics linked to Modbus parameters * of devices in Modbus network. *******************************************************************************************************/ /** * @brief Assign parameter description table for Modbus controller interface. * * @param[in] descriptor pointer to parameter description table * @param num_elements number of elements in the table * * @return * - esp_err_t ESP_OK - set descriptor successfully * - esp_err_t ESP_ERR_INVALID_ARG - invalid argument in function call */ esp_err_t mbc_master_set_descriptor(const mb_parameter_descriptor_t* descriptor, const uint16_t num_elements); /** * @brief Send data request as defined in parameter request, waits response * from slave and returns status of command execution. This function provides standard way * for read/write access to Modbus devices in the network. * * @param[in] request pointer to request structure of type mb_param_request_t * @param[in] data_ptr pointer to data buffer to send or received data (dependent of command field in request) * * @return * - esp_err_t ESP_OK - request was successful * - esp_err_t ESP_ERR_INVALID_ARG - invalid argument of function * - esp_err_t ESP_ERR_INVALID_RESPONSE - an invalid response from slave * - esp_err_t ESP_ERR_TIMEOUT - operation timeout or no response from slave * - esp_err_t ESP_ERR_NOT_SUPPORTED - the request command is not supported by slave * - esp_err_t ESP_FAIL - slave returned an exception or other failure */ esp_err_t mbc_master_send_request(mb_param_request_t* request, void* data_ptr); /** * @brief Get information about supported characteristic defined as cid. Uses parameter description table to get * this information. The function will check if characteristic defined as a cid parameter is supported * and returns its description in param_info. Returns ESP_ERR_NOT_FOUND if characteristic is not supported. * * @param[in] cid characteristic id * @param param_info pointer to pointer of characteristic data. * * @return * - esp_err_t ESP_OK - request was successful and buffer contains the supported characteristic name * - esp_err_t ESP_ERR_INVALID_ARG - invalid argument of function * - esp_err_t ESP_ERR_NOT_FOUND - the characteristic (cid) not found * - esp_err_t ESP_FAIL - unknown error during lookup table processing */ esp_err_t mbc_master_get_cid_info(uint16_t cid, const mb_parameter_descriptor_t** param_info); /** * @brief Read parameter from modbus slave device whose name is defined by name and has cid. * The additional data for request is taken from parameter description (lookup) table. * * @param[in] cid id of the characteristic for parameter * @param[in] name pointer into string name (key) of parameter (null terminated) * @param[out] value pointer to data buffer of parameter * @param[out] type parameter type associated with the name returned from parameter description table. * * @return * - esp_err_t ESP_OK - request was successful and value buffer contains * representation of actual parameter data from slave * - esp_err_t ESP_ERR_INVALID_ARG - invalid argument of function * - esp_err_t ESP_ERR_INVALID_RESPONSE - an invalid response from slave * - esp_err_t ESP_ERR_INVALID_STATE - invalid state during data processing or allocation failure * - esp_err_t ESP_ERR_TIMEOUT - operation timed out and no response from slave * - esp_err_t ESP_ERR_NOT_SUPPORTED - the request command is not supported by slave * - esp_err_t ESP_ERR_NOT_FOUND - the parameter is not found in the parameter description table * - esp_err_t ESP_FAIL - slave returned an exception or other failure */ esp_err_t mbc_master_get_parameter(uint16_t cid, char* name, uint8_t* value, uint8_t *type); /** * @brief Set characteristic's value defined as a name and cid parameter. * The additional data for cid parameter request is taken from master parameter lookup table. * * @param[in] cid id of the characteristic for parameter * @param[in] name pointer into string name (key) of parameter (null terminated) * @param[out] value pointer to data buffer of parameter (actual representation of json value field in binary form) * @param[out] type pointer to parameter type associated with the name returned from parameter lookup table. * * @return * - esp_err_t ESP_OK - request was successful and value was saved in the slave device registers * - esp_err_t ESP_ERR_INVALID_ARG - invalid argument of function * - esp_err_t ESP_ERR_INVALID_RESPONSE - an invalid response from slave during processing of parameter * - esp_err_t ESP_ERR_INVALID_STATE - invalid state during data processing or allocation failure * - esp_err_t ESP_ERR_TIMEOUT - operation timed out and no response from slave * - esp_err_t ESP_ERR_NOT_SUPPORTED - the request command is not supported by slave * - esp_err_t ESP_FAIL - slave returned an exception or other failure */ esp_err_t mbc_master_set_parameter(uint16_t cid, char* name, uint8_t* value, uint8_t *type); #ifdef __cplusplus } #endif #endif // _ESP_MB_MASTER_INTERFACE_H