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esp-modbus: initial component update

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Alex Lisitsyn
2022-04-05 15:33:17 +08:00
parent d1a0493a79
commit 304a0a446a
138 changed files with 1789 additions and 1517 deletions
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test/serial/mb_serial_master/CMakeLists.txt
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# The following lines of boilerplate have to be in your project's CMakeLists
# in this exact order for cmake to work correctly
cmake_minimum_required(VERSION 3.5)
set(EXTRA_COMPONENT_DIRS "../../../")
set(EXCLUDE_COMPONENTS examples test_app test freemodbus)
# Include parameters from common modbus folder
set(MB_PARAMS_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../../mb_example_common")
list(APPEND EXTRA_COMPONENT_DIRS "${MB_PARAMS_DIR}")
include($ENV{IDF_PATH}/tools/cmake/project.cmake)
project(modbus_master)
test/serial/mb_serial_master/Makefile
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#
# This is a project Makefile. It is assumed the directory this Makefile resides in is a
# project subdirectory.
#
PROJECT_NAME := modbus_master
EXTRA_COMPONENT_DIRS := ../../../
EXTRA_COMPONENT_DIRS += ../../mb_example_common
EXCLUDE_COMPONENTS := examples test freemodbus
include $(IDF_PATH)/make/project.mk
test/serial/mb_serial_master/README.md
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| Supported Targets | ESP32 | ESP32-S2 | ESP32-S3 | ESP32-C3 |
| ----------------- | ----- | -------- | -------- | -------- |
# Modbus Master Example
This example demonstrates using of FreeModbus stack port implementation for ESP32 as a master device.
This implementation is able to read/write values of slave devices connected into Modbus segment. All parameters to be accessed are defined in data dictionary of the modbus master example source file.
The values represented as characteristics with its name and characteristic CID which are linked into registers of slave devices connected into Modbus segment.
The example implements simple control algorithm and checks parameters from slave device and gets alarm (relay in the slave device) when value of holding_data0 parameter exceeded limit.
The instances for the modbus parameters are common for master and slave examples and located in `examples/protocols/modbus/mb_example_common` folder.
Example parameters definition:
--------------------------------------------------------------------------------------------------
| Slave Address | Characteristic ID | Characteristic name | Description |
|---------------------|----------------------|----------------------|----------------------------|
| MB_DEVICE_ADDR1 | CID_INP_DATA_0, | Data_channel_0 | Data channel 1 |
| MB_DEVICE_ADDR1 | CID_HOLD_DATA_0, | Humidity_1 | Humidity 1 |
| MB_DEVICE_ADDR1 | CID_INP_DATA_1 | Temperature_1 | Sensor temperature |
| MB_DEVICE_ADDR1 | CID_HOLD_DATA_1, | Humidity_2 | Humidity 2 |
| MB_DEVICE_ADDR1 | CID_INP_DATA_2 | Temperature_2 | Ambient temperature |
| MB_DEVICE_ADDR1 | CID_HOLD_DATA_2 | Humidity_3 | Humidity 3 |
| MB_DEVICE_ADDR1 | CID_RELAY_P1 | RelayP1 | Alarm Relay outputs on/off |
| MB_DEVICE_ADDR1 | CID_RELAY_P2 | RelayP2 | Alarm Relay outputs on/off |
--------------------------------------------------------------------------------------------------
Note: The Slave Address is the same for all parameters for example test but it can be changed in the ```Example Data (Object) Dictionary``` table of master example to address parameters from other slaves.
The Kconfig ```Modbus slave address``` - CONFIG_MB_SLAVE_ADDR parameter in slave example can be configured to create Modbus multi slave segment.
Simplified Modbus connection schematic for example test:
```
MB_DEVICE_ADDR1
------------- -------------
| | RS485 network | |
| Slave 1 |---<>--+---<>---| Master |
| | | |
------------- -------------
```
Modbus multi slave segment connection schematic:
```
MB_DEVICE_ADDR1
-------------
| |
| Slave 1 |---<>--+
| | |
------------- |
MB_DEVICE_ADDR2 |
------------- | -------------
| | | | |
| Slave 2 |---<>--+---<>---| Master |
| | | | |
------------- | -------------
MB_DEVICE_ADDR3 |
------------- RS485 network
| | |
| Slave 3 |---<>--+
| |
-------------
```
## Hardware required :
Option 1:
PC (Modbus Slave app) + USB Serial adapter connected to USB port + RS485 line drivers + ESP32 based board
Option 2:
Several ESP32 boards flashed with modbus_slave example software to represent slave device with specific slave address (See CONFIG_MB_SLAVE_ADDR). The slave addresses for each board have to be configured as defined in "connection schematic" above.
One ESP32 board flashed with modbus_master example. All the boards require connection of RS485 line drivers (see below).
The MAX485 line driver is used as an example below but other similar chips can be used as well.
RS485 example circuit schematic for connection of master and slave devices into segment:
```
VCC ---------------+ +--------------- VCC
| |
+-------x-------+ +-------x-------+
RXD <------| RO | DIFFERENTIAL | RO|-----> RXD
| B|---------------|B |
TXD ------>| DI MAX485 | \ / | MAX485 DI|<----- TXD
ESP32 BOARD | | RS-485 side | | External PC (emulator) with USB to serial or
RTS --+--->| DE | / \ | DE|---+ ESP32 BOARD (slave)
| | A|---------------|A | |
+----| /RE | PAIR | /RE|---+-- RTS
+-------x-------+ +-------x-------+
| |
--- ---
Modbus Master device Modbus Slave device
```
## How to setup and use an example:
### Configure the application
Start the command below to setup configuration:
```
idf.py menuconfig
```
Configure the UART pins used for modbus communication using and table below.
Define the communication mode parameter for master and slave in Kconfig - CONFIG_MB_COMM_MODE (must be the same for master and slave devices in one segment).
Configure the slave address for each slave in the Modbus segment (the CONFIG_MB_SLAVE_ADDR in Kconfig).
```
--------------------------------------------------------------------------------------------------------------------------
| UART Interface | #define | Default ESP32 Pin | Default pins for | External RS485 Driver Pin |
| | | | ESP32-S2(S3, C3) | |
| ----------------------|--------------------|-----------------------|-----------------------|---------------------------|
| Transmit Data (TxD) | CONFIG_MB_UART_TXD | GPIO23 | GPIO9 | DI |
| Receive Data (RxD) | CONFIG_MB_UART_RXD | GPIO22 | GPIO8 | RO |
| Request To Send (RTS) | CONFIG_MB_UART_RTS | GPIO18 | GPIO10 | ~RE/DE |
| Ground | n/a | GND | GND | GND |
--------------------------------------------------------------------------------------------------------------------------
```
Note: Each target chip has different GPIO pins available for UART connection. Please refer to UART documentation for selected target for more information.
Connect a USB-to-RS485 adapter to a computer, then connect the adapter's A/B output lines with the corresponding A/B output lines of the RS485 line driver connected to the ESP32 chip (see figure above).
The communication parameters of Modbus stack allow to configure it appropriately but usually it is enough to use default settings.
See the help string of parameters for more information.
### Setup external Modbus slave devices or emulator
Option 1:
Configure the external Modbus master software according to port configuration parameters used in the example. The Modbus Slave application can be used with this example to emulate slave devices with its parameters. Use official documentation for software to setup emulation of slave devices.
Option 2:
Other option is to have the modbus_slave example application flashed into ESP32 based board and connect boards together as showed on the Modbus connection schematic above. See the Modbus slave API documentation to configure communication parameters and slave addresses as defined in "Example parameters definition" table above.
### Build and flash software of master device
Build the project and flash it to the board, then run monitor tool to view serial output:
```
idf.py -p PORT flash monitor
```
(To exit the serial monitor, type ``Ctrl-]``.)
See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
## Example Output
Example output of the application:
```
I (9035) MASTER_TEST: Characteristic #0 Data_channel_0 (Volts) value = 1.120000 (0x3f8f5c29) read successful.
I (9045) MASTER_TEST: Characteristic #1 Humidity_1 (%rH) value = 5.539999 (0x40b147ac) read successful.
I (9045) MASTER_TEST: Characteristic #2 Temperature_1 (C) value = 2.340000 (0x4015c28f) read successful.
I (9055) MASTER_TEST: Characteristic #3 Humidity_2 (%rH) value = 2.560000 (0x4023d70a) read successful.
I (9065) MASTER_TEST: Characteristic #4 Temperature_2 (C) value = 3.560000 (0x4063d70a) read successful.
I (9075) MASTER_TEST: Characteristic #5 Humidity_3 (%rH) value = 3.780000 (0x4071eb85) read successful.
I (9085) MASTER_TEST: Characteristic #6 RelayP1 (on/off) value = OFF (0x55) read successful.
I (9095) MASTER_TEST: Characteristic #7 RelayP2 (on/off) value = OFF (0xaa) read successful.
I (9605) MASTER_TEST: Characteristic #0 Data_channel_0 (Volts) value = 1.120000 (0x3f8f5c29) read successful.
I (9615) MASTER_TEST: Characteristic #1 Humidity_1 (%rH) value = 5.739999 (0x40b7ae12) read successful.
I (9615) MASTER_TEST: Characteristic #2 Temperature_1 (C) value = 2.340000 (0x4015c28f) read successful.
I (9625) MASTER_TEST: Characteristic #3 Humidity_2 (%rH) value = 2.560000 (0x4023d70a) read successful.
I (9635) MASTER_TEST: Characteristic #4 Temperature_2 (C) value = 3.560000 (0x4063d70a) read successful.
I (9645) MASTER_TEST: Characteristic #5 Humidity_3 (%rH) value = 3.780000 (0x4071eb85) read successful.
I (9655) MASTER_TEST: Characteristic #6 RelayP1 (on/off) value = OFF (0x55) read successful.
I (9665) MASTER_TEST: Characteristic #7 RelayP2 (on/off) value = ON (0xff) read successful.
I (10175) MASTER_TEST: Alarm triggered by cid #7.
I (10175) MASTER_TEST: Destroy master...
```
The example reads the characteristics from slave device(s), while alarm is not triggered in the slave device (See the "Example parameters definition"). The output line describes Timestamp, Cid of characteristic, Characteristic name (Units), Characteristic value (Hex).
test/serial/mb_serial_master/main/CMakeLists.txt
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set(PROJECT_NAME "modbus_master")
idf_component_register(SRCS "master.c"
INCLUDE_DIRS ".")
test/serial/mb_serial_master/main/Kconfig.projbuild
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menu "Modbus Example Configuration"
config MB_UART_PORT_NUM
int "UART port number"
range 0 2 if IDF_TARGET_ESP32 || IDF_TARGET_ESP32S3
default 2 if IDF_TARGET_ESP32 || IDF_TARGET_ESP32S3
range 0 1 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32C3
default 1 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32C3
help
UART communication port number for Modbus example.
config MB_UART_BAUD_RATE
int "UART communication speed"
range 1200 115200
default 115200
help
UART communication speed for Modbus example.
config MB_UART_RXD
int "UART RXD pin number"
range 0 34 if IDF_TARGET_ESP32
default 22 if IDF_TARGET_ESP32
range 0 46 if IDF_TARGET_ESP32S2
range 0 47 if IDF_TARGET_ESP32S3
range 0 19 if IDF_TARGET_ESP32C3
default 8 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32S3 || IDF_TARGET_ESP32C3
help
GPIO number for UART RX pin. See UART documentation for more information
about available pin numbers for UART.
config MB_UART_TXD
int "UART TXD pin number"
range 0 34 if IDF_TARGET_ESP32
default 23 if IDF_TARGET_ESP32
range 0 46 if IDF_TARGET_ESP32S2
range 0 47 if IDF_TARGET_ESP32S3
range 0 19 if IDF_TARGET_ESP32C3
default 9 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32S3 || IDF_TARGET_ESP32C3
help
GPIO number for UART TX pin. See UART documentation for more information
about available pin numbers for UART.
config MB_UART_RTS
int "UART RTS pin number"
range 0 34 if IDF_TARGET_ESP32
default 18 if IDF_TARGET_ESP32
range 0 46 if IDF_TARGET_ESP32S2
range 0 47 if IDF_TARGET_ESP32S3
range 0 19 if IDF_TARGET_ESP32C3
default 10 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32S3 || IDF_TARGET_ESP32C3
help
GPIO number for UART RTS pin. This pin is connected to
~RE/DE pin of RS485 transceiver to switch direction.
See UART documentation for more information about available pin
numbers for UART.
choice MB_COMM_MODE
prompt "Modbus communication mode"
default MB_COMM_MODE_RTU if CONFIG_FMB_COMM_MODE_RTU_EN
help
Selection of Modbus communication mode option for Modbus.
config MB_COMM_MODE_RTU
bool "RTU mode"
depends on FMB_COMM_MODE_RTU_EN
config MB_COMM_MODE_ASCII
bool "ASCII mode"
depends on FMB_COMM_MODE_ASCII_EN
endchoice
endmenu
test/serial/mb_serial_master/main/component.mk
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#
# "main" pseudo-component makefile.
#
# (Uses default behaviour of compiling all source files in directory, adding 'include' to include path.)
test/serial/mb_serial_master/main/master.c
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/*
* SPDX-FileCopyrightText: 2016-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include "string.h"
#include "esp_log.h"
#include "modbus_params.h" // for modbus parameters structures
#include "mbcontroller.h"
#include "sdkconfig.h"
#define MB_PORT_NUM (CONFIG_MB_UART_PORT_NUM) // Number of UART port used for Modbus connection
#define MB_DEV_SPEED (CONFIG_MB_UART_BAUD_RATE) // The communication speed of the UART
// Note: Some pins on target chip cannot be assigned for UART communication.
// See UART documentation for selected board and target to configure pins using Kconfig.
// The number of parameters that intended to be used in the particular control process
#define MASTER_MAX_CIDS num_device_parameters
// Number of reading of parameters from slave
#define MASTER_MAX_RETRY 30
// Timeout to update cid over Modbus
#define UPDATE_CIDS_TIMEOUT_MS (500)
#define UPDATE_CIDS_TIMEOUT_TICS (UPDATE_CIDS_TIMEOUT_MS / portTICK_PERIOD_MS)
// Timeout between polls
#define POLL_TIMEOUT_MS (1)
#define POLL_TIMEOUT_TICS (POLL_TIMEOUT_MS / portTICK_PERIOD_MS)
// The macro to get offset for parameter in the appropriate structure
#define HOLD_OFFSET(field) ((uint16_t)(offsetof(holding_reg_params_t, field) + 1))
#define INPUT_OFFSET(field) ((uint16_t)(offsetof(input_reg_params_t, field) + 1))
#define COIL_OFFSET(field) ((uint16_t)(offsetof(coil_reg_params_t, field) + 1))
// Discrete offset macro
#define DISCR_OFFSET(field) ((uint16_t)(offsetof(discrete_reg_params_t, field) + 1))
#define STR(fieldname) ((const char*)( fieldname ))
// Options can be used as bit masks or parameter limits
#define OPTS(min_val, max_val, step_val) { .opt1 = min_val, .opt2 = max_val, .opt3 = step_val }
static const char *TAG = "MASTER_TEST";
// Enumeration of modbus device addresses accessed by master device
enum {
MB_DEVICE_ADDR1 = 1 // Only one slave device used for the test (add other slave addresses here)
};
// Enumeration of all supported CIDs for device (used in parameter definition table)
enum {
CID_INP_DATA_0 = 0,
CID_HOLD_DATA_0,
CID_INP_DATA_1,
CID_HOLD_DATA_1,
CID_INP_DATA_2,
CID_HOLD_DATA_2,
CID_HOLD_TEST_REG,
CID_RELAY_P1,
CID_RELAY_P2,
CID_COUNT
};
// Example Data (Object) Dictionary for Modbus parameters:
// The CID field in the table must be unique.
// Modbus Slave Addr field defines slave address of the device with correspond parameter.
// Modbus Reg Type - Type of Modbus register area (Holding register, Input Register and such).
// Reg Start field defines the start Modbus register number and Reg Size defines the number of registers for the characteristic accordingly.
// The Instance Offset defines offset in the appropriate parameter structure that will be used as instance to save parameter value.
// Data Type, Data Size specify type of the characteristic and its data size.
// Parameter Options field specifies the options that can be used to process parameter value (limits or masks).
// Access Mode - can be used to implement custom options for processing of characteristic (Read/Write restrictions, factory mode values and etc).
const mb_parameter_descriptor_t device_parameters[] = {
// { CID, Param Name, Units, Modbus Slave Addr, Modbus Reg Type, Reg Start, Reg Size, Instance Offset, Data Type, Data Size, Parameter Options, Access Mode}
{ CID_INP_DATA_0, STR("Data_channel_0"), STR("Volts"), MB_DEVICE_ADDR1, MB_PARAM_INPUT, 0, 2,
INPUT_OFFSET(input_data0), PARAM_TYPE_FLOAT, 4, OPTS( -10, 10, 1 ), PAR_PERMS_READ_WRITE_TRIGGER },
{ CID_HOLD_DATA_0, STR("Humidity_1"), STR("%rH"), MB_DEVICE_ADDR1, MB_PARAM_HOLDING, 0, 2,
HOLD_OFFSET(holding_data0), PARAM_TYPE_FLOAT, 4, OPTS( 0, 100, 1 ), PAR_PERMS_READ_WRITE_TRIGGER },
{ CID_INP_DATA_1, STR("Temperature_1"), STR("C"), MB_DEVICE_ADDR1, MB_PARAM_INPUT, 2, 2,
INPUT_OFFSET(input_data1), PARAM_TYPE_FLOAT, 4, OPTS( -40, 100, 1 ), PAR_PERMS_READ_WRITE_TRIGGER },
{ CID_HOLD_DATA_1, STR("Humidity_2"), STR("%rH"), MB_DEVICE_ADDR1, MB_PARAM_HOLDING, 2, 2,
HOLD_OFFSET(holding_data1), PARAM_TYPE_FLOAT, 4, OPTS( 0, 100, 1 ), PAR_PERMS_READ_WRITE_TRIGGER },
{ CID_INP_DATA_2, STR("Temperature_2"), STR("C"), MB_DEVICE_ADDR1, MB_PARAM_INPUT, 4, 2,
INPUT_OFFSET(input_data2), PARAM_TYPE_FLOAT, 4, OPTS( -40, 100, 1 ), PAR_PERMS_READ_WRITE_TRIGGER },
{ CID_HOLD_DATA_2, STR("Humidity_3"), STR("%rH"), MB_DEVICE_ADDR1, MB_PARAM_HOLDING, 4, 2,
HOLD_OFFSET(holding_data2), PARAM_TYPE_FLOAT, 4, OPTS( 0, 100, 1 ), PAR_PERMS_READ_WRITE_TRIGGER },
{ CID_HOLD_TEST_REG, STR("Test_regs"), STR("__"), MB_DEVICE_ADDR1, MB_PARAM_HOLDING, 10, 58,
HOLD_OFFSET(test_regs), PARAM_TYPE_ASCII, 116, OPTS( 0, 100, 1 ), PAR_PERMS_READ_WRITE_TRIGGER },
{ CID_RELAY_P1, STR("RelayP1"), STR("on/off"), MB_DEVICE_ADDR1, MB_PARAM_COIL, 0, 8,
COIL_OFFSET(coils_port0), PARAM_TYPE_U16, 2, OPTS( BIT1, 0, 0 ), PAR_PERMS_READ_WRITE_TRIGGER },
{ CID_RELAY_P2, STR("RelayP2"), STR("on/off"), MB_DEVICE_ADDR1, MB_PARAM_COIL, 8, 8,
COIL_OFFSET(coils_port1), PARAM_TYPE_U16, 2, OPTS( BIT0, 0, 0 ), PAR_PERMS_READ_WRITE_TRIGGER }
};
// Calculate number of parameters in the table
const uint16_t num_device_parameters = (sizeof(device_parameters)/sizeof(device_parameters[0]));
// The function to get pointer to parameter storage (instance) according to parameter description table
static void* master_get_param_data(const mb_parameter_descriptor_t* param_descriptor)
{
assert(param_descriptor != NULL);
void* instance_ptr = NULL;
if (param_descriptor->param_offset != 0) {
switch(param_descriptor->mb_param_type)
{
case MB_PARAM_HOLDING:
instance_ptr = ((void*)&holding_reg_params + param_descriptor->param_offset - 1);
break;
case MB_PARAM_INPUT:
instance_ptr = ((void*)&input_reg_params + param_descriptor->param_offset - 1);
break;
case MB_PARAM_COIL:
instance_ptr = ((void*)&coil_reg_params + param_descriptor->param_offset - 1);
break;
case MB_PARAM_DISCRETE:
instance_ptr = ((void*)&discrete_reg_params + param_descriptor->param_offset - 1);
break;
default:
instance_ptr = NULL;
break;
}
} else {
ESP_LOGE(TAG, "Wrong parameter offset for CID #%d", param_descriptor->cid);
assert(instance_ptr != NULL);
}
return instance_ptr;
}
// User operation function to read slave values and check alarm
static void master_operation_func(void *arg)
{
esp_err_t err = ESP_OK;
float value = 0;
bool alarm_state = false;
const mb_parameter_descriptor_t* param_descriptor = NULL;
ESP_LOGI(TAG, "Start modbus test...");
for(uint16_t retry = 0; retry <= MASTER_MAX_RETRY && (!alarm_state); retry++) {
// Read all found characteristics from slave(s)
for (uint16_t cid = 0; (err != ESP_ERR_NOT_FOUND) && cid < MASTER_MAX_CIDS; cid++)
{
// Get data from parameters description table
// and use this information to fill the characteristics description table
// and having all required fields in just one table
err = mbc_master_get_cid_info(cid, &param_descriptor);
if ((err != ESP_ERR_NOT_FOUND) && (param_descriptor != NULL)) {
void* temp_data_ptr = master_get_param_data(param_descriptor);
assert(temp_data_ptr);
uint8_t type = 0;
if ((param_descriptor->param_type == PARAM_TYPE_ASCII) &&
(param_descriptor->cid == CID_HOLD_TEST_REG)) {
// Check for long array of registers of type PARAM_TYPE_ASCII
err = mbc_master_get_parameter(cid, (char*)param_descriptor->param_key,
(uint8_t*)temp_data_ptr, &type);
if (err == ESP_OK) {
ESP_LOGI(TAG, "Characteristic #%d %s (%s) value = (0x%08x) read successful.",
param_descriptor->cid,
(char*)param_descriptor->param_key,
(char*)param_descriptor->param_units,
*(uint32_t*)temp_data_ptr);
// Initialize data of test array and write to slave
if (*(uint32_t*)temp_data_ptr != 0xAAAAAAAA) {
memset((void*)temp_data_ptr, 0xAA, param_descriptor->param_size);
*(uint32_t*)temp_data_ptr = 0xAAAAAAAA;
err = mbc_master_set_parameter(cid, (char*)param_descriptor->param_key,
(uint8_t*)temp_data_ptr, &type);
if (err == ESP_OK) {
ESP_LOGI(TAG, "Characteristic #%d %s (%s) value = (0x%08x), write successful.",
param_descriptor->cid,
(char*)param_descriptor->param_key,
(char*)param_descriptor->param_units,
*(uint32_t*)temp_data_ptr);
} else {
ESP_LOGE(TAG, "Characteristic #%d (%s) write fail, err = 0x%x (%s).",
param_descriptor->cid,
(char*)param_descriptor->param_key,
(int)err,
(char*)esp_err_to_name(err));
}
}
} else {
ESP_LOGE(TAG, "Characteristic #%d (%s) read fail, err = 0x%x (%s).",
param_descriptor->cid,
(char*)param_descriptor->param_key,
(int)err,
(char*)esp_err_to_name(err));
}
} else {
err = mbc_master_get_parameter(cid, (char*)param_descriptor->param_key,
(uint8_t*)&value, &type);
if (err == ESP_OK) {
*(float*)temp_data_ptr = value;
if ((param_descriptor->mb_param_type == MB_PARAM_HOLDING) ||
(param_descriptor->mb_param_type == MB_PARAM_INPUT)) {
ESP_LOGI(TAG, "Characteristic #%d %s (%s) value = %f (0x%x) read successful.",
param_descriptor->cid,
(char*)param_descriptor->param_key,
(char*)param_descriptor->param_units,
value,
*(uint32_t*)temp_data_ptr);
if (((value > param_descriptor->param_opts.max) ||
(value < param_descriptor->param_opts.min))) {
alarm_state = true;
break;
}
} else {
uint16_t state = *(uint16_t*)temp_data_ptr;
const char* rw_str = (state & param_descriptor->param_opts.opt1) ? "ON" : "OFF";
ESP_LOGI(TAG, "Characteristic #%d %s (%s) value = %s (0x%x) read successful.",
param_descriptor->cid,
(char*)param_descriptor->param_key,
(char*)param_descriptor->param_units,
(const char*)rw_str,
*(uint16_t*)temp_data_ptr);
if (state & param_descriptor->param_opts.opt1) {
alarm_state = true;
break;
}
}
} else {
ESP_LOGE(TAG, "Characteristic #%d (%s) read fail, err = 0x%x (%s).",
param_descriptor->cid,
(char*)param_descriptor->param_key,
(int)err,
(char*)esp_err_to_name(err));
}
}
vTaskDelay(POLL_TIMEOUT_TICS); // timeout between polls
}
}
vTaskDelay(UPDATE_CIDS_TIMEOUT_TICS); //
}
if (alarm_state) {
ESP_LOGI(TAG, "Alarm triggered by cid #%d.",
param_descriptor->cid);
} else {
ESP_LOGE(TAG, "Alarm is not triggered after %d retries.",
MASTER_MAX_RETRY);
}
ESP_LOGI(TAG, "Destroy master...");
ESP_ERROR_CHECK(mbc_master_destroy());
}
// Modbus master initialization
static esp_err_t master_init(void)
{
// Initialize and start Modbus controller
mb_communication_info_t comm = {
.port = MB_PORT_NUM,
#if CONFIG_MB_COMM_MODE_ASCII
.mode = MB_MODE_ASCII,
#elif CONFIG_MB_COMM_MODE_RTU
.mode = MB_MODE_RTU,
#endif
.baudrate = MB_DEV_SPEED,
.parity = MB_PARITY_NONE
};
void* master_handler = NULL;
esp_err_t err = mbc_master_init(MB_PORT_SERIAL_MASTER, &master_handler);
MB_RETURN_ON_FALSE((master_handler != NULL), ESP_ERR_INVALID_STATE, TAG,
"mb controller initialization fail.");
MB_RETURN_ON_FALSE((err == ESP_OK), ESP_ERR_INVALID_STATE, TAG,
"mb controller initialization fail, returns(0x%x).",
(uint32_t)err);
err = mbc_master_setup((void*)&comm);
MB_RETURN_ON_FALSE((err == ESP_OK), ESP_ERR_INVALID_STATE, TAG,
"mb controller setup fail, returns(0x%x).",
(uint32_t)err);
// Set UART pin numbers
err = uart_set_pin(MB_PORT_NUM, CONFIG_MB_UART_TXD, CONFIG_MB_UART_RXD,
CONFIG_MB_UART_RTS, UART_PIN_NO_CHANGE);
err = mbc_master_start();
MB_RETURN_ON_FALSE((err == ESP_OK), ESP_ERR_INVALID_STATE, TAG,
"mb controller start fail, returns(0x%x).",
(uint32_t)err);
MB_RETURN_ON_FALSE((err == ESP_OK), ESP_ERR_INVALID_STATE, TAG,
"mb serial set pin failure, uart_set_pin() returned (0x%x).", (uint32_t)err);
// Set driver mode to Half Duplex
err = uart_set_mode(MB_PORT_NUM, UART_MODE_RS485_HALF_DUPLEX);
MB_RETURN_ON_FALSE((err == ESP_OK), ESP_ERR_INVALID_STATE, TAG,
"mb serial set mode failure, uart_set_mode() returned (0x%x).", (uint32_t)err);
vTaskDelay(5);
err = mbc_master_set_descriptor(&device_parameters[0], num_device_parameters);
MB_RETURN_ON_FALSE((err == ESP_OK), ESP_ERR_INVALID_STATE, TAG,
"mb controller set descriptor fail, returns(0x%x).",
(uint32_t)err);
ESP_LOGI(TAG, "Modbus master stack initialized...");
return err;
}
void app_main(void)
{
// Initialization of device peripheral and objects
ESP_ERROR_CHECK(master_init());
vTaskDelay(10);
master_operation_func(NULL);
}
test/serial/mb_serial_master/sdkconfig.defaults
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#
# Modbus configuration
#
CONFIG_MB_COMM_MODE_ASCII=y
CONFIG_MB_UART_BAUD_RATE=115200
CONFIG_FMB_TIMER_PORT_ENABLED=n
CONFIG_FMB_TIMER_ISR_IN_IRAM=y
CONFIG_FMB_MASTER_DELAY_MS_CONVERT=200
CONFIG_FMB_MASTER_TIMEOUT_MS_RESPOND=400
CONFIG_FMB_TIMER_USE_ISR_DISPATCH_METHOD=y
test/serial/mb_serial_slave/CMakeLists.txt
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# The following lines of boilerplate have to be in your project's CMakeLists
# in this exact order for cmake to work correctly
cmake_minimum_required(VERSION 3.5)
set(EXTRA_COMPONENT_DIRS "../../../")
set(EXCLUDE_COMPONENTS examples test_app test freemodbus)
# Include parameters from common modbus folder
set(MB_PARAMS_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../../mb_example_common")
list(APPEND EXTRA_COMPONENT_DIRS "${MB_PARAMS_DIR}")
include($ENV{IDF_PATH}/tools/cmake/project.cmake)
project(modbus_slave)
test/serial/mb_serial_slave/Makefile
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#
# This is a project Makefile. It is assumed the directory this Makefile resides in is a
# project subdirectory.
#
PROJECT_NAME := modbus_slave
EXTRA_COMPONENT_DIRS := ../../../
EXTRA_COMPONENT_DIRS += ../../mb_example_common
EXCLUDE_COMPONENTS := examples test freemodbus
include $(IDF_PATH)/make/project.mk
test/serial/mb_serial_slave/README.md
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| Supported Targets | ESP32 | ESP32-S2 | ESP32-S3 | ESP32-C3 |
| ----------------- | ----- | -------- | -------- | -------- |
# Modbus Slave Example
This example demonstrates using the port of the FreeModbus stack on an ESP32 target where the ESP32 target is operating as a network slave. The example allows an external Modbus host to read/write device parameters on the ESP32 target using the Modbus protocol. The parameters accessible through Modbus are located in `mb_example_common/modbus_params.h\c` source/header files that users can update to add/remove their own custom parameters.
These are represented in structures `holding_reg_params`, `input_reg_params`, `coil_reg_params`, `discrete_reg_params` for holding registers, input parameters, coils and discrete inputs accordingly. The app_main application demonstrates how to setup Modbus stack and use notifications about parameters change from host system.
The FreeModbus stack located in `components/freemodbus` folder and contains the `/port` folder where the stack's port to the ESP32 is situated. There are some parameters of the port that can be configured in KConfig file to start stack correctly (See description below for more information).
The slave example uses shared parameter structures defined in `examples/protocols/modbus/mb_example_common` folder.
## Hardware required :
Option 1:
PC + USB Serial adapter connected to USB port + RS485 line drivers + ESP32 based board.
The MAX485 line driver is used as an example below but other similar chips can be used as well.
Option 2:
The modbus_master example application configured as described in its README.md file and flashed into ESP32 based board.
Note: The ```Example Data (Object) Dictionary``` in the modbus_master example can be edited to address parameters from other slaves connected into Modbus segment.
RS485 example circuit schematic:
```
VCC ---------------+ +--------------- VCC
| |
+-------x-------+ +-------x-------+
RXD <------| RO | DIFFERENTIAL | RO|-----> RXD
| B|---------------|B |
TXD ------>| DI MAX485 | \ / | MAX485 DI|<----- TXD
ESP32 board | | RS-485 side | | Modbus master
RTS --+--->| DE | / \ | DE|---+
| | A|---------------|A | |
+----| /RE | PAIR | /RE|---+-- RTS
+-------x--------+ +-------x-------+
| |
--- ---
```
## How to setup and use an example:
### Configure the application
Start the command below to show the configuration menu:
```
idf.py menuconfig
```
Select Modbus Example Configuration menu item.
Configure the UART pins used for modbus communication using the command and table below.
```
--------------------------------------------------------------------------------------------------------------------------
| UART Interface | #define | Default ESP32 Pin | Default pins for | External RS485 Driver Pin |
| | | | ESP32-S2(S3, C3) | |
| ----------------------|--------------------|-----------------------|-----------------------|---------------------------|
| Transmit Data (TxD) | CONFIG_MB_UART_TXD | GPIO23 | GPIO9 | DI |
| Receive Data (RxD) | CONFIG_MB_UART_RXD | GPIO22 | GPIO8 | RO |
| Request To Send (RTS) | CONFIG_MB_UART_RTS | GPIO18 | GPIO10 | ~RE/DE |
| Ground | n/a | GND | GND | GND |
--------------------------------------------------------------------------------------------------------------------------
```
Note: Each target chip has different GPIO pins available for UART connection. Please refer to UART documentation for selected target for more information.
Define the ```Modbus communiction mode``` for slave in Kconfig - CONFIG_MB_COMM_MODE (must be the same for master and slave application).
Set ```Modbus slave address``` for the example application (by default for example script is set to 1).
The communication parameters of freemodbus stack (Component config->Modbus configuration) allow to configure it appropriately but usually it is enough to use default settings.
See the help strings of parameters for more information.
### Setup external Modbus master software
Option 1:
Configure the external Modbus master software according to port configuration parameters used in application.
As an example the Modbus Poll application can be used with this example.
Option 2:
Setup ESP32 based board and set modbus_master example configuration as described in its README.md file.
Setup one or more slave boards with different slave addresses and connect them into the same Modbus segment (See configuration above).
Note: The ```Modbus communiction mode``` parameter must be the same for master and slave example application to be able to communicate with each other.
### Build and flash software
Build the project and flash it to the board, then run monitor tool to view serial output:
```
idf.py -p PORT flash monitor
```
(To exit the serial monitor, type ``Ctrl-]``.)
See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
## Example Output
Example output of the application:
```
I (13941) SLAVE_TEST: INPUT READ (13651163 us), ADDR:1, TYPE:8, INST_ADDR:0x3ffb2fd0, SIZE:2
I (13951) SLAVE_TEST: HOLDING READ (13656431 us), ADDR:1, TYPE:2, INST_ADDR:0x3ffb2fe0, SIZE:2
I (13961) SLAVE_TEST: INPUT READ (13665877 us), ADDR:3, TYPE:8, INST_ADDR:0x3ffb2fd4, SIZE:2
I (13971) SLAVE_TEST: HOLDING READ (13676010 us), ADDR:3, TYPE:2, INST_ADDR:0x3ffb2fe4, SIZE:2
I (13981) SLAVE_TEST: INPUT READ (13686130 us), ADDR:5, TYPE:8, INST_ADDR:0x3ffb2fd8, SIZE:2
I (13991) SLAVE_TEST: HOLDING READ (13696267 us), ADDR:5, TYPE:2, INST_ADDR:0x3ffb2fe8, SIZE:2
I (14001) SLAVE_TEST: COILS READ (13706331 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb2fcc, SIZE:8
I (14001) SLAVE_TEST: Modbus controller destroyed.
```
The output lines describe type of operation, its timestamp, modbus address, access type, storage address in parameter structure and number of registers accordingly.
test/serial/mb_serial_slave/main/CMakeLists.txt
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set(PROJECT_NAME "modbus_slave")
idf_component_register(SRCS "slave.c"
INCLUDE_DIRS ".")
test/serial/mb_serial_slave/main/Kconfig.projbuild
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menu "Modbus Example Configuration"
config MB_UART_PORT_NUM
int "UART port number"
range 0 2 if IDF_TARGET_ESP32 || IDF_TARGET_ESP32S3
default 2 if IDF_TARGET_ESP32 || IDF_TARGET_ESP32S3
range 0 1 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32C3
default 1 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32C3
help
UART communication port number for Modbus example.
config MB_UART_BAUD_RATE
int "UART communication speed"
range 1200 115200
default 115200
help
UART communication speed for Modbus example.
config MB_UART_RXD
int "UART RXD pin number"
range 0 34 if IDF_TARGET_ESP32
default 22 if IDF_TARGET_ESP32
range 0 46 if IDF_TARGET_ESP32S2
range 0 47 if IDF_TARGET_ESP32S3
range 0 19 if IDF_TARGET_ESP32C3
default 8 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32S3 || IDF_TARGET_ESP32C3
help
GPIO number for UART RX pin. See UART documentation for more information
about available pin numbers for UART.
config MB_UART_TXD
int "UART TXD pin number"
range 0 34 if IDF_TARGET_ESP32
default 23 if IDF_TARGET_ESP32
range 0 46 if IDF_TARGET_ESP32S2
range 0 47 if IDF_TARGET_ESP32S3
range 0 19 if IDF_TARGET_ESP32C3
default 9 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32S3 || IDF_TARGET_ESP32C3
help
GPIO number for UART TX pin. See UART documentation for more information
about available pin numbers for UART.
config MB_UART_RTS
int "UART RTS pin number"
range 0 34 if IDF_TARGET_ESP32
default 18 if IDF_TARGET_ESP32
range 0 46 if IDF_TARGET_ESP32S2
range 0 47 if IDF_TARGET_ESP32S3
range 0 19 if IDF_TARGET_ESP32C3
default 10 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32S3 || IDF_TARGET_ESP32C3
help
GPIO number for UART RTS pin. This pin is connected to
~RE/DE pin of RS485 transceiver to switch direction.
See UART documentation for more information about available pin
numbers for UART.
choice MB_COMM_MODE
prompt "Modbus communication mode"
default MB_COMM_MODE_RTU if CONFIG_FMB_COMM_MODE_RTU_EN
help
Selection of Modbus communication mode option for Modbus.
config MB_COMM_MODE_RTU
bool "RTU mode"
depends on FMB_COMM_MODE_RTU_EN
config MB_COMM_MODE_ASCII
bool "ASCII mode"
depends on FMB_COMM_MODE_ASCII_EN
endchoice
config MB_SLAVE_ADDR
int "Modbus slave address"
range 1 127
default 1
help
This is the Modbus slave address in the network.
It is used to organize Modbus network with several slaves connected into the same segment.
endmenu
test/serial/mb_serial_slave/main/component.mk
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#
# "main" pseudo-component makefile.
#
# (Uses default behaviour of compiling all source files in directory, adding 'include' to include path.)
test/serial/mb_serial_slave/main/slave.c
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/*
* SPDX-FileCopyrightText: 2016-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
// FreeModbus Slave Example ESP32
#include <stdio.h>
#include <stdint.h>
#include "esp_err.h"
#include "mbcontroller.h" // for mbcontroller defines and api
#include "modbus_params.h" // for modbus parameters structures
#include "esp_log.h" // for log_write
#include "sdkconfig.h"
#define MB_PORT_NUM (CONFIG_MB_UART_PORT_NUM) // Number of UART port used for Modbus connection
#define MB_SLAVE_ADDR (CONFIG_MB_SLAVE_ADDR) // The address of device in Modbus network
#define MB_DEV_SPEED (CONFIG_MB_UART_BAUD_RATE) // The communication speed of the UART
// Note: Some pins on target chip cannot be assigned for UART communication.
// Please refer to documentation for selected board and target to configure pins using Kconfig.
// Defines below are used to define register start address for each type of Modbus registers
#define HOLD_OFFSET(field) ((uint16_t)(offsetof(holding_reg_params_t, field) >> 1))
#define INPUT_OFFSET(field) ((uint16_t)(offsetof(input_reg_params_t, field) >> 1))
#define MB_REG_DISCRETE_INPUT_START (0x0000)
#define MB_REG_COILS_START (0x0000)
#define MB_REG_INPUT_START_AREA0 (INPUT_OFFSET(input_data0)) // register offset input area 0
#define MB_REG_INPUT_START_AREA1 (INPUT_OFFSET(input_data4)) // register offset input area 1
#define MB_REG_HOLDING_START_AREA0 (HOLD_OFFSET(holding_data0))
#define MB_REG_HOLDING_START_AREA1 (HOLD_OFFSET(holding_data4))
#define MB_PAR_INFO_GET_TOUT (10) // Timeout for get parameter info
#define MB_CHAN_DATA_MAX_VAL (6)
#define MB_CHAN_DATA_OFFSET (0.2f)
#define MB_READ_MASK (MB_EVENT_INPUT_REG_RD \
| MB_EVENT_HOLDING_REG_RD \
| MB_EVENT_DISCRETE_RD \
| MB_EVENT_COILS_RD)
#define MB_WRITE_MASK (MB_EVENT_HOLDING_REG_WR \
| MB_EVENT_COILS_WR)
#define MB_READ_WRITE_MASK (MB_READ_MASK | MB_WRITE_MASK)
static const char *TAG = "SLAVE_TEST";
static portMUX_TYPE param_lock = portMUX_INITIALIZER_UNLOCKED;
// Set register values into known state
static void setup_reg_data(void)
{
// Define initial state of parameters
discrete_reg_params.discrete_input0 = 1;
discrete_reg_params.discrete_input1 = 0;
discrete_reg_params.discrete_input2 = 1;
discrete_reg_params.discrete_input3 = 0;
discrete_reg_params.discrete_input4 = 1;
discrete_reg_params.discrete_input5 = 0;
discrete_reg_params.discrete_input6 = 1;
discrete_reg_params.discrete_input7 = 0;
holding_reg_params.holding_data0 = 1.34;
holding_reg_params.holding_data1 = 2.56;
holding_reg_params.holding_data2 = 3.78;
holding_reg_params.holding_data3 = 4.90;
holding_reg_params.holding_data4 = 5.67;
holding_reg_params.holding_data5 = 6.78;
holding_reg_params.holding_data6 = 7.79;
holding_reg_params.holding_data7 = 8.80;
coil_reg_params.coils_port0 = 0x55;
coil_reg_params.coils_port1 = 0xAA;
input_reg_params.input_data0 = 1.12;
input_reg_params.input_data1 = 2.34;
input_reg_params.input_data2 = 3.56;
input_reg_params.input_data3 = 4.78;
input_reg_params.input_data4 = 1.12;
input_reg_params.input_data5 = 2.34;
input_reg_params.input_data6 = 3.56;
input_reg_params.input_data7 = 4.78;
}
// An example application of Modbus slave. It is based on freemodbus stack.
// See deviceparams.h file for more information about assigned Modbus parameters.
// These parameters can be accessed from main application and also can be changed
// by external Modbus master host.
void app_main(void)
{
mb_param_info_t reg_info; // keeps the Modbus registers access information
mb_communication_info_t comm_info; // Modbus communication parameters
mb_register_area_descriptor_t reg_area; // Modbus register area descriptor structure
// Set UART log level
esp_log_level_set(TAG, ESP_LOG_INFO);
void* mbc_slave_handler = NULL;
ESP_ERROR_CHECK(mbc_slave_init(MB_PORT_SERIAL_SLAVE, &mbc_slave_handler)); // Initialization of Modbus controller
// Setup communication parameters and start stack
#if CONFIG_MB_COMM_MODE_ASCII
comm_info.mode = MB_MODE_ASCII,
#elif CONFIG_MB_COMM_MODE_RTU
comm_info.mode = MB_MODE_RTU,
#endif
comm_info.slave_addr = MB_SLAVE_ADDR;
comm_info.port = MB_PORT_NUM;
comm_info.baudrate = MB_DEV_SPEED;
comm_info.parity = MB_PARITY_NONE;
ESP_ERROR_CHECK(mbc_slave_setup((void*)&comm_info));
// The code below initializes Modbus register area descriptors
// for Modbus Holding Registers, Input Registers, Coils and Discrete Inputs
// Initialization should be done for each supported Modbus register area according to register map.
// When external master trying to access the register in the area that is not initialized
// by mbc_slave_set_descriptor() API call then Modbus stack
// will send exception response for this register area.
reg_area.type = MB_PARAM_HOLDING; // Set type of register area
reg_area.start_offset = MB_REG_HOLDING_START_AREA0; // Offset of register area in Modbus protocol
reg_area.address = (void*)&holding_reg_params.holding_data0; // Set pointer to storage instance
// Set the size of register storage instance = 150 holding registers
reg_area.size = (size_t)(HOLD_OFFSET(holding_data4) - HOLD_OFFSET(test_regs));
ESP_ERROR_CHECK(mbc_slave_set_descriptor(reg_area));
reg_area.type = MB_PARAM_HOLDING; // Set type of register area
reg_area.start_offset = MB_REG_HOLDING_START_AREA1; // Offset of register area in Modbus protocol
reg_area.address = (void*)&holding_reg_params.holding_data4; // Set pointer to storage instance
reg_area.size = sizeof(float) << 2; // Set the size of register storage instance
ESP_ERROR_CHECK(mbc_slave_set_descriptor(reg_area));
// Initialization of Input Registers area
reg_area.type = MB_PARAM_INPUT;
reg_area.start_offset = MB_REG_INPUT_START_AREA0;
reg_area.address = (void*)&input_reg_params.input_data0;
reg_area.size = sizeof(float) << 2;
ESP_ERROR_CHECK(mbc_slave_set_descriptor(reg_area));
reg_area.type = MB_PARAM_INPUT;
reg_area.start_offset = MB_REG_INPUT_START_AREA1;
reg_area.address = (void*)&input_reg_params.input_data4;
reg_area.size = sizeof(float) << 2;
ESP_ERROR_CHECK(mbc_slave_set_descriptor(reg_area));
// Initialization of Coils register area
reg_area.type = MB_PARAM_COIL;
reg_area.start_offset = MB_REG_COILS_START;
reg_area.address = (void*)&coil_reg_params;
reg_area.size = sizeof(coil_reg_params);
ESP_ERROR_CHECK(mbc_slave_set_descriptor(reg_area));
// Initialization of Discrete Inputs register area
reg_area.type = MB_PARAM_DISCRETE;
reg_area.start_offset = MB_REG_DISCRETE_INPUT_START;
reg_area.address = (void*)&discrete_reg_params;
reg_area.size = sizeof(discrete_reg_params);
ESP_ERROR_CHECK(mbc_slave_set_descriptor(reg_area));
setup_reg_data(); // Set values into known state
// Starts of modbus controller and stack
ESP_ERROR_CHECK(mbc_slave_start());
// Set UART pin numbers
ESP_ERROR_CHECK(uart_set_pin(MB_PORT_NUM, CONFIG_MB_UART_TXD,
CONFIG_MB_UART_RXD, CONFIG_MB_UART_RTS,
UART_PIN_NO_CHANGE));
// Set UART driver mode to Half Duplex
ESP_ERROR_CHECK(uart_set_mode(MB_PORT_NUM, UART_MODE_RS485_HALF_DUPLEX));
ESP_LOGI(TAG, "Modbus slave stack initialized.");
ESP_LOGI(TAG, "Start modbus test...");
// The cycle below will be terminated when parameter holdingRegParams.dataChan0
// incremented each access cycle reaches the CHAN_DATA_MAX_VAL value.
for(;holding_reg_params.holding_data0 < MB_CHAN_DATA_MAX_VAL;) {
// Check for read/write events of Modbus master for certain events
mb_event_group_t event = mbc_slave_check_event(MB_READ_WRITE_MASK);
const char* rw_str = (event & MB_READ_MASK) ? "READ" : "WRITE";
// Filter events and process them accordingly
if(event & (MB_EVENT_HOLDING_REG_WR | MB_EVENT_HOLDING_REG_RD)) {
// Get parameter information from parameter queue
ESP_ERROR_CHECK(mbc_slave_get_param_info(&reg_info, MB_PAR_INFO_GET_TOUT));
ESP_LOGI(TAG, "HOLDING %s (%u us), ADDR:%u, TYPE:%u, INST_ADDR:0x%.4x, SIZE:%u",
rw_str,
(uint32_t)reg_info.time_stamp,
(uint32_t)reg_info.mb_offset,
(uint32_t)reg_info.type,
(uint32_t)reg_info.address,
(uint32_t)reg_info.size);
if (reg_info.address == (uint8_t*)&holding_reg_params.holding_data0)
{
portENTER_CRITICAL(&param_lock);
holding_reg_params.holding_data0 += MB_CHAN_DATA_OFFSET;
if (holding_reg_params.holding_data0 >= (MB_CHAN_DATA_MAX_VAL - MB_CHAN_DATA_OFFSET)) {
coil_reg_params.coils_port1 = 0xFF;
}
portEXIT_CRITICAL(&param_lock);
}
} else if (event & MB_EVENT_INPUT_REG_RD) {
ESP_ERROR_CHECK(mbc_slave_get_param_info(&reg_info, MB_PAR_INFO_GET_TOUT));
ESP_LOGI(TAG, "INPUT READ (%u us), ADDR:%u, TYPE:%u, INST_ADDR:0x%.4x, SIZE:%u",
(uint32_t)reg_info.time_stamp,
(uint32_t)reg_info.mb_offset,
(uint32_t)reg_info.type,
(uint32_t)reg_info.address,
(uint32_t)reg_info.size);
} else if (event & MB_EVENT_DISCRETE_RD) {
ESP_ERROR_CHECK(mbc_slave_get_param_info(&reg_info, MB_PAR_INFO_GET_TOUT));
ESP_LOGI(TAG, "DISCRETE READ (%u us): ADDR:%u, TYPE:%u, INST_ADDR:0x%.4x, SIZE:%u",
(uint32_t)reg_info.time_stamp,
(uint32_t)reg_info.mb_offset,
(uint32_t)reg_info.type,
(uint32_t)reg_info.address,
(uint32_t)reg_info.size);
} else if (event & (MB_EVENT_COILS_RD | MB_EVENT_COILS_WR)) {
ESP_ERROR_CHECK(mbc_slave_get_param_info(&reg_info, MB_PAR_INFO_GET_TOUT));
ESP_LOGI(TAG, "COILS %s (%u us), ADDR:%u, TYPE:%u, INST_ADDR:0x%.4x, SIZE:%u",
rw_str,
(uint32_t)reg_info.time_stamp,
(uint32_t)reg_info.mb_offset,
(uint32_t)reg_info.type,
(uint32_t)reg_info.address,
(uint32_t)reg_info.size);
if (coil_reg_params.coils_port1 == 0xFF) break;
}
}
// Destroy of Modbus controller on alarm
ESP_LOGI(TAG,"Modbus controller destroyed.");
vTaskDelay(100);
ESP_ERROR_CHECK(mbc_slave_destroy());
}
test/serial/mb_serial_slave/sdkconfig.defaults
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#
# Modbus configuration
#
CONFIG_MB_COMM_MODE_ASCII=y
CONFIG_MB_SLAVE_ADDR=1
CONFIG_MB_UART_BAUD_RATE=115200
CONFIG_FMB_TIMER_PORT_ENABLED=n
CONFIG_FMB_TIMER_ISR_IN_IRAM=y
CONFIG_FMB_TIMER_USE_ISR_DISPATCH_METHOD=y