67f62a79c1
add support of modbus master ascii rename base dir name of master and slave example to be mb_slave, mb_master to avoid conflict with sdio/slave example test add Kconfig option to enable ASCII and RTU mode separately update ASCII options + remove cast for errors added baudrate for examples into Kconfig updated magic numbers for timer timeout put ascii private definitions into one file
198 lines
9.3 KiB
C
198 lines
9.3 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 <stdint.h>
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#include "esp_err.h"
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#include "mbcontroller.h" // for mbcontroller defines and api
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#include "modbus_params.h" // for modbus parameters structures
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#include "esp_log.h" // for log_write
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#include "sdkconfig.h"
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#define MB_PORT_NUM (CONFIG_MB_UART_PORT_NUM) // Number of UART port used for Modbus connection
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#define MB_SLAVE_ADDR (CONFIG_MB_SLAVE_ADDR) // The address of device in Modbus network
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#define MB_DEV_SPEED (CONFIG_MB_UART_BAUD_RATE) // 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 (6)
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#define MB_CHAN_DATA_OFFSET (0.2f)
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#define MB_READ_MASK (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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| MB_EVENT_COILS_RD)
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#define MB_WRITE_MASK (MB_EVENT_HOLDING_REG_WR \
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| MB_EVENT_COILS_WR)
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#define MB_READ_WRITE_MASK (MB_READ_MASK | MB_WRITE_MASK)
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static const char *SLAVE_TAG = "SLAVE_TEST";
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static portMUX_TYPE param_lock = portMUX_INITIALIZER_UNLOCKED;
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// Set register values into known state
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static void setup_reg_data(void)
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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.holding_data0 = 1.34;
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holding_reg_params.holding_data1 = 2.56;
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holding_reg_params.holding_data2 = 3.78;
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holding_reg_params.holding_data3 = 4.90;
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coil_reg_params.coils_port0 = 0x55;
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coil_reg_params.coils_port1 = 0xAA;
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input_reg_params.input_data0 = 1.12;
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input_reg_params.input_data1 = 2.34;
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input_reg_params.input_data2 = 3.56;
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input_reg_params.input_data3 = 4.78;
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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(void)
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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(SLAVE_TAG, ESP_LOG_INFO);
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void* mbc_slave_handler = NULL;
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ESP_ERROR_CHECK(mbc_slave_init(MB_PORT_SERIAL_SLAVE, &mbc_slave_handler)); // Initialization of Modbus controller
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// Setup communication parameters and start stack
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#if CONFIG_MB_COMM_MODE_ASCII
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comm_info.mode = MB_MODE_ASCII,
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#elif CONFIG_MB_COMM_MODE_RTU
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comm_info.mode = MB_MODE_RTU,
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#endif
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comm_info.slave_addr = MB_SLAVE_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(mbc_slave_setup((void*)&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 mbc_slave_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(mbc_slave_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(mbc_slave_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(mbc_slave_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(mbc_slave_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(mbc_slave_start());
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// Set UART pin numbers
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ESP_ERROR_CHECK(uart_set_pin(MB_PORT_NUM, CONFIG_MB_UART_TXD,
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CONFIG_MB_UART_RXD, CONFIG_MB_UART_RTS,
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UART_PIN_NO_CHANGE));
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// Set UART driver mode to Half Duplex
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ESP_ERROR_CHECK(uart_set_mode(MB_PORT_NUM, UART_MODE_RS485_HALF_DUPLEX));
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ESP_LOGI(SLAVE_TAG, "Modbus slave stack initialized.");
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ESP_LOGI(SLAVE_TAG, "Start modbus test...");
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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.holding_data0 < 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 = mbc_slave_check_event(MB_READ_WRITE_MASK);
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const char* rw_str = (event & MB_READ_MASK) ? "READ" : "WRITE";
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// Filter events and process them accordingly
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if(event & (MB_EVENT_HOLDING_REG_WR | MB_EVENT_HOLDING_REG_RD)) {
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// Get parameter information from parameter queue
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ESP_ERROR_CHECK(mbc_slave_get_param_info(®_info, MB_PAR_INFO_GET_TOUT));
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ESP_LOGI(SLAVE_TAG, "HOLDING %s (%u us), ADDR:%u, TYPE:%u, INST_ADDR:0x%.4x, SIZE:%u",
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rw_str,
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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.holding_data0)
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{
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portENTER_CRITICAL(¶m_lock);
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holding_reg_params.holding_data0 += MB_CHAN_DATA_OFFSET;
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if (holding_reg_params.holding_data0 >= (MB_CHAN_DATA_MAX_VAL - MB_CHAN_DATA_OFFSET)) {
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coil_reg_params.coils_port1 = 0xFF;
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}
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portEXIT_CRITICAL(¶m_lock);
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}
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} else if (event & MB_EVENT_INPUT_REG_RD) {
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ESP_ERROR_CHECK(mbc_slave_get_param_info(®_info, MB_PAR_INFO_GET_TOUT));
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ESP_LOGI(SLAVE_TAG, "INPUT READ (%u us), ADDR:%u, TYPE:%u, INST_ADDR:0x%.4x, SIZE:%u",
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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(mbc_slave_get_param_info(®_info, MB_PAR_INFO_GET_TOUT));
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ESP_LOGI(SLAVE_TAG, "DISCRETE READ (%u us): ADDR:%u, TYPE:%u, INST_ADDR:0x%.4x, SIZE:%u",
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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 | MB_EVENT_COILS_WR)) {
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ESP_ERROR_CHECK(mbc_slave_get_param_info(®_info, MB_PAR_INFO_GET_TOUT));
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ESP_LOGI(SLAVE_TAG, "COILS %s (%u us), ADDR:%u, TYPE:%u, INST_ADDR:0x%.4x, SIZE:%u",
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rw_str,
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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 (coil_reg_params.coils_port1 == 0xFF) break;
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}
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}
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// Destroy of Modbus controller on alarm
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ESP_LOGI(SLAVE_TAG,"Modbus controller destroyed.");
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vTaskDelay(100);
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ESP_ERROR_CHECK(mbc_slave_destroy());
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}
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