一、到处mb_master项目例程
二、idf.py menuconfig修改
dio=》QIO 80M速度烧写，4m flash
修改它的consol为usb
修改modbus的输出串口为串口0 tx 17 rx 16 rts因为我这里没用到就直接分配到3. 如果你是485通信你自己看着办。mosbus为RTU模式
三、修改代码
这里改成串口模式，如果你是485就不改吧。我是用usb-ttl
去掉这里两句，便于观察，否则填写线圈数据错了就报警退出了。
修改循环次数为
四、整体代码
/*
* SPDX-FileCopyrightText: 2016-2023 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 500 //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_DISCR_P1,
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, 2, 6,
COIL_OFFSET(coils_port0), PARAM_TYPE_U8, 1, OPTS( 0xAA, 0x15, 0 ), PAR_PERMS_READ_WRITE_TRIGGER },
{ CID_RELAY_P2, STR("RelayP2"), STR("on/off"), MB_DEVICE_ADDR1, MB_PARAM_COIL, 10, 6,
COIL_OFFSET(coils_port1), PARAM_TYPE_U8, 1, OPTS( 0x55, 0x2A, 0 ), PAR_PERMS_READ_WRITE_TRIGGER },
{ CID_DISCR_P1, STR("DiscreteInpP1"), STR("on/off"), MB_DEVICE_ADDR1, MB_PARAM_DISCRETE, 2, 7,
DISCR_OFFSET(discrete_input_port1), PARAM_TYPE_U8, 1, OPTS( 0xAA, 0x15, 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 #%u", (unsigned)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, ¶m_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 #%u %s (%s) value = (0x%" PRIx32 ") read successful.",
param_descriptor->cid,
param_descriptor->param_key,
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 #%u %s (%s) value = (0x%" PRIx32 "), write successful.",
param_descriptor->cid,
param_descriptor->param_key,
param_descriptor->param_units,
*(uint32_t*)temp_data_ptr);
} else {
ESP_LOGE(TAG, "Characteristic #%u (%s) write fail, err = 0x%x (%s).",
param_descriptor->cid,
param_descriptor->param_key,
(int)err,
(char*)esp_err_to_name(err));
}
}
} else {
ESP_LOGE(TAG, "Characteristic #%u (%s) read fail, err = 0x%x (%s).",
param_descriptor->cid,
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*)temp_data_ptr, &type);
if (err == ESP_OK) {
if ((param_descriptor->mb_param_type == MB_PARAM_HOLDING) ||
(param_descriptor->mb_param_type == MB_PARAM_INPUT)) {
value = *(float*)temp_data_ptr;
ESP_LOGI(TAG, "Characteristic #%u %s (%s) value = %f (0x%" PRIx32 ") read successful.",
param_descriptor->cid,
param_descriptor->param_key,
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 {
uint8_t state = *(uint8_t*)temp_data_ptr;
const char* rw_str = (state & param_descriptor->param_opts.opt1) ? "ON" : "OFF";
if ((state & param_descriptor->param_opts.opt2) == param_descriptor->param_opts.opt2) {
ESP_LOGI(TAG, "Characteristic #%u %s (%s) value = %s (0x%" PRIx8 ") read successful.",
param_descriptor->cid,
param_descriptor->param_key,
param_descriptor->param_units,
(const char*)rw_str,
*(uint8_t*)temp_data_ptr);
} else {
ESP_LOGE(TAG, "Characteristic #%u %s (%s) value = %s (0x%" PRIx8 "), unexpected value.",
param_descriptor->cid,
param_descriptor->param_key,
param_descriptor->param_units,
(const char*)rw_str,
*(uint8_t*)temp_data_ptr);
// alarm_state = true;
break;
}
if (state & param_descriptor->param_opts.opt1) {
// alarm_state = true;
break;
}
}
} else {
ESP_LOGE(TAG, "Characteristic #%u (%s) read fail, err = 0x%x (%s).",
param_descriptor->cid,
param_descriptor->param_key,
(int)err,
(char*)esp_err_to_name(err));
}
}
vTaskDelay(POLL_TIMEOUT_TICS); // timeout between polls
}
}
vTaskDelay(UPDATE_CIDS_TIMEOUT_TICS*10);
}
if (alarm_state) {
ESP_LOGI(TAG, "Alarm triggered by cid #%u.", param_descriptor->cid);
} else {
ESP_LOGE(TAG, "Alarm is not triggered after %u 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).", (int)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).", (int)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 = uart_set_pin(MB_PORT_NUM, CONFIG_MB_UART_TXD, CONFIG_MB_UART_RXD,
UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
MB_RETURN_ON_FALSE((err == ESP_OK), ESP_ERR_INVALID_STATE, TAG,
"mb serial set pin failure, uart_set_pin() returned (0x%x).", (int)err);
err = mbc_master_start();
MB_RETURN_ON_FALSE((err == ESP_OK), ESP_ERR_INVALID_STATE, TAG,
"mb controller start fail, returned (0x%x).", (int)err);
// Set driver mode to Half Duplex
//err = uart_set_mode(MB_PORT_NUM, UART_MODE_RS485_HALF_DUPLEX);
err = uart_set_mode(MB_PORT_NUM, UART_MODE_UART);
MB_RETURN_ON_FALSE((err == ESP_OK), ESP_ERR_INVALID_STATE, TAG,
"mb serial set mode failure, uart_set_mode() returned (0x%x).", (int)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).", (int)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);
}
五、编译烧写。
Idf.py -p COM73 flash
六、准备modbus slave和串口工具MobaXterm_Personal进行调试
配置如下：记得前面两个是2个单元一个浮点的数据，填写数据不要超过 范围，具体可以看代码。
线圈（左下）可以实时修改看打印结果，右边的那个是个数据单元区，打开就可以。
实验实验结果：
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