f0eb9985b9
This example adds functionality to support basic communication in RS485 networks using Modbus protocol. This example uses FreeModbus stack and regular UART driver API to communicate in RS485 half duplex mode. Added initial support of modbus controller pure C api to access device parameters over Modbus transport. Move freemodbus stack and port files into components folder Move the modbus_controller interface into components idf folder Source files updated after review. Add modbus interface documentation docs/en/api-reference/protocols/modbus.rst porttimer.c: fix bug with timer1 selected in the Kconfig Add support of cmake system (added cmake files) Closes https://github.com/espressif/esp-idf/issues/858
169 lines
7.9 KiB
C
169 lines
7.9 KiB
C
/* FreeModbus Slave Example ESP32
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include <stdio.h>
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#include "esp_err.h"
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#include "sdkconfig.h"
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#include "mbcontroller.h" // for mbcontroller defines and api
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#include "deviceparams.h" // for device parameters structures
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#include "esp_log.h" // for log_write
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#define MB_PORT_NUM (2) // Number of UART port used for Modbus connection
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#define MB_DEV_ADDR (1) // The address of device in Modbus network
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#define MB_DEV_SPEED (115200) // The communication speed of the UART
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// Defines below are used to define register start address for each type of Modbus registers
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#define MB_REG_DISCRETE_INPUT_START (0x0000)
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#define MB_REG_INPUT_START (0x0000)
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#define MB_REG_HOLDING_START (0x0000)
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#define MB_REG_COILS_START (0x0000)
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#define MB_PAR_INFO_GET_TOUT (10) // Timeout for get parameter info
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#define MB_CHAN_DATA_MAX_VAL (10)
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#define MB_CHAN_DATA_OFFSET (0.01f)
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static const char *TAG = "MODBUS_SLAVE_APP";
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// Set register values into known state
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static void setup_reg_data()
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{
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// Define initial state of parameters
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discrete_reg_params.discrete_input1 = 1;
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discrete_reg_params.discrete_input3 = 1;
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discrete_reg_params.discrete_input5 = 1;
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discrete_reg_params.discrete_input7 = 1;
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holding_reg_params.data_chan0 = 1.34;
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holding_reg_params.data_chan1 = 2.56;
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holding_reg_params.data_chan2 = 3.78;
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holding_reg_params.data_chan3 = 4.90;
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coil_reg_params.coil0 = 1;
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coil_reg_params.coil2 = 1;
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coil_reg_params.coil4 = 1;
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coil_reg_params.coil6 = 1;
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coil_reg_params.coil7 = 1;
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input_reg_params.data_chan0 = 1.34;
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input_reg_params.data_chan1 = 2.56;
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input_reg_params.data_chan2 = 3.78;
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input_reg_params.data_chan3 = 4.90;
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}
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// An example application of Modbus slave. It is based on freemodbus stack.
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// See deviceparams.h file for more information about assigned Modbus parameters.
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// These parameters can be accessed from main application and also can be changed
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// by external Modbus master host.
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void app_main()
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{
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mb_param_info_t reg_info; // keeps the Modbus registers access information
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mb_communication_info_t comm_info; // Modbus communication parameters
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mb_register_area_descriptor_t reg_area; // Modbus register area descriptor structure
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// Set UART log level
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esp_log_level_set(TAG, ESP_LOG_INFO);
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mbcontroller_init(); // Initialization of Modbus controller
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// Setup communication parameters and start stack
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comm_info.mode = MB_MODE_RTU;
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comm_info.slave_addr = MB_DEV_ADDR;
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comm_info.port = MB_PORT_NUM;
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comm_info.baudrate = MB_DEV_SPEED;
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comm_info.parity = MB_PARITY_NONE;
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ESP_ERROR_CHECK(mbcontroller_setup(comm_info));
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// The code below initializes Modbus register area descriptors
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// for Modbus Holding Registers, Input Registers, Coils and Discrete Inputs
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// Initialization should be done for each supported Modbus register area according to register map.
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// When external master trying to access the register in the area that is not initialized
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// by mbcontroller_set_descriptor() API call then Modbus stack
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// will send exception response for this register area.
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reg_area.type = MB_PARAM_HOLDING; // Set type of register area
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reg_area.start_offset = MB_REG_HOLDING_START; // Offset of register area in Modbus protocol
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reg_area.address = (void*)&holding_reg_params; // Set pointer to storage instance
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reg_area.size = sizeof(holding_reg_params); // Set the size of register storage instance
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ESP_ERROR_CHECK(mbcontroller_set_descriptor(reg_area));
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// Initialization of Input Registers area
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reg_area.type = MB_PARAM_INPUT;
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reg_area.start_offset = MB_REG_INPUT_START;
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reg_area.address = (void*)&input_reg_params;
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reg_area.size = sizeof(input_reg_params);
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ESP_ERROR_CHECK(mbcontroller_set_descriptor(reg_area));
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// Initialization of Coils register area
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reg_area.type = MB_PARAM_COIL;
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reg_area.start_offset = MB_REG_COILS_START;
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reg_area.address = (void*)&coil_reg_params;
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reg_area.size = sizeof(coil_reg_params);
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ESP_ERROR_CHECK(mbcontroller_set_descriptor(reg_area));
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// Initialization of Discrete Inputs register area
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reg_area.type = MB_PARAM_DISCRETE;
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reg_area.start_offset = MB_REG_DISCRETE_INPUT_START;
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reg_area.address = (void*)&discrete_reg_params;
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reg_area.size = sizeof(discrete_reg_params);
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ESP_ERROR_CHECK(mbcontroller_set_descriptor(reg_area));
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setup_reg_data(); // Set values into known state
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// Starts of modbus controller and stack
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ESP_ERROR_CHECK(mbcontroller_start());
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// The cycle below will be terminated when parameter holdingRegParams.dataChan0
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// incremented each access cycle reaches the CHAN_DATA_MAX_VAL value.
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for(;holding_reg_params.data_chan0 < MB_CHAN_DATA_MAX_VAL;){
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// Check for read/write events of Modbus master for certain events
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mb_event_group_t event = mbcontroller_check_event((MB_EVENT_HOLDING_REG_WR
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| MB_EVENT_INPUT_REG_RD
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| MB_EVENT_HOLDING_REG_RD
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| MB_EVENT_DISCRETE_RD));
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// Filter events and process them accordingly
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if((event & MB_EVENT_HOLDING_REG_WR) || (event & MB_EVENT_HOLDING_REG_RD)) {
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// Get parameter information from parameter queue
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ESP_ERROR_CHECK(mbcontroller_get_param_info(®_info, MB_PAR_INFO_GET_TOUT));
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printf("HOLDING READ/WRITE: time_stamp(us):%u, mb_addr:%u, type:%u, st_address:0x%.4x, size:%u\r\n",
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(uint32_t)reg_info.time_stamp,
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(uint32_t)reg_info.mb_offset,
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(uint32_t)reg_info.type,
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(uint32_t)reg_info.address,
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(uint32_t)reg_info.size);
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if (reg_info.address == (uint8_t*)&holding_reg_params.data_chan0)
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{
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holding_reg_params.data_chan0 += MB_CHAN_DATA_OFFSET;
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}
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} else if (event & MB_EVENT_INPUT_REG_RD) {
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ESP_ERROR_CHECK(mbcontroller_get_param_info(®_info, MB_PAR_INFO_GET_TOUT));
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printf("INPUT READ: time_stamp(us):%u, mb_addr:%u, type:%u, st_address:0x%.4x, size:%u\r\n",
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(uint32_t)reg_info.time_stamp,
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(uint32_t)reg_info.mb_offset,
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(uint32_t)reg_info.type,
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(uint32_t)reg_info.address,
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(uint32_t)reg_info.size);
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} else if (event & MB_EVENT_DISCRETE_RD) {
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ESP_ERROR_CHECK(mbcontroller_get_param_info(®_info, MB_PAR_INFO_GET_TOUT));
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printf("DISCRETE READ: time_stamp(us):%u, mb_addr:%u, type:%u, st_address:0x%.4x, size:%u\r\n",
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(uint32_t)reg_info.time_stamp,
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(uint32_t)reg_info.mb_offset,
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(uint32_t)reg_info.type,
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(uint32_t)reg_info.address,
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(uint32_t)reg_info.size);
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} else if (event & MB_EVENT_COILS_RD) {
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ESP_ERROR_CHECK(mbcontroller_get_param_info(®_info, MB_PAR_INFO_GET_TOUT));
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printf("COILS READ: time_stamp(us):%u, mb_addr:%u, type:%u, st_address:0x%.4x, size:%u\r\n",
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(uint32_t)reg_info.time_stamp,
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(uint32_t)reg_info.mb_offset,
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(uint32_t)reg_info.type,
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(uint32_t)reg_info.address,
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(uint32_t)reg_info.size);
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}
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}
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// Destroy of Modbus controller once get maximum value of data_chan0
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printf("Modbus controller destroyed.");
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ESP_ERROR_CHECK(mbcontroller_destroy());
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}
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