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20 分钟

使用RAK3172和STM32F031K6实现安全可靠的长距离数据传输

适用于物联网网络无线通信的Class A/B/C LoRaWAN 1.0.3低功耗解决方案

LR 14 Click with Nucleo 32 with STM32F031K6 MCU

已发布 11月 14, 2024

点击板

LR 14 Click

开发板

Nucleo 32 with STM32F031K6 MCU

编译器

NECTO Studio

微控制器单元

STM32F031K6

实现远程、低功耗无线通信,用于支持 LoRaWAN 的物联网网络,非常适合远程传感、资产跟踪和物联网部署

A

A

硬件概览

它是如何工作的?

LR 14 Click 基于 RAK3172,这是来自 RAKwireless Technology 的 Class A/B/C LoRaWAN 1.0.3 低功耗模块。该模块整合了 STM32WLE5CC,一款 ARM Cortex-M4 32 位芯片,专为无线应用中的低功耗、长距离数据传输而设计,非常适合 IoT 网络。LR 14 Click 中的 RAK3172 模块允许轻松集成 LoRaWAN 服务器平台,如 TheThingsNetwork (TTN)、Chirpstack 和 Actility,从而促进广泛的 LoRaWAN 应用。它还支持 LoRa 点对点 (P2P) 通信,用户可以快速有效地建立自定义 LoRa 网络,无需依赖外部服务器。RAK3172 模块兼容多个频段,包括 IN865、EU868 和 RU864,提供显著的灵活性,搭配优化天线时可实现超过 15 公里的通信距离。模块操作简单,RAK3172 可以通过 UART 接口发送 AT 命令进行配置,为微调模式和操作参数提供直观的控制方案。凭借低功耗能力和多功能性,LR 14 Click 特别适

用于高效能耗至关重要的电池供电应用。此外,LR 14 Click 包含 SPI 和 I2C 接口,以扩展其功能。SPI 接口专用于与 STM32WLE5CCU6 的 RF 子系统交互,有助于稳健地管理模块的无线通信功能。同时,I2C 接口允许板作为主机,利用其内部 MCU 控制外部 I2C 外设设备。该 Click 板还配备了 USB Type-C 接口,允许通过 PC 供电和配置。这一功能通过高度集成的 USB-to-UART 桥接器 CP2102N 和 LDO 稳压器 NCP186 实现,后者将 USB 电源转换为模块所需的 3.3V。此外,板载还有一个电池连接器,使其可作为完全独立的单元运行,使用 MC34671 电池充电器对连接的电池充电。橙色的 CHG LED 直观地指示充电过程,提供实时状态反馈。除了接口引脚,该板还包括额外的 mikroBUS™ 引脚,以增强控制。RST 引脚和专用 RST 按钮可轻松重置模块,而 AN 引脚可用于监测连接电池的状态。LR 14 Click 集

成了多项功能,以提高其功能性和适应性。6 引脚 SWD 连接器用于 RAK3172 模块的固件更新,确保用户可以轻松保持模块的最新状态。BOOT 按钮提供对引导程序的控制,按下该按钮可通过 UART 启动引导程序以进行固件更新,释放按钮则退出引导程序,返回主应用程序固件。为优化功耗,可以切断板背面的特定痕迹以禁用 LED 指示灯和电池电压监测等组件,从而减少功耗。该板还包含一个未焊接的 6 个 GPIO 引脚的接头,提供进一步的定制可能性。此外,还配有一个用户可配置的红色 LED 指示灯,以及一个 SMA 天线连接器,可连接 MIKROE 商店提供的 868MHz 橡胶天线,以实现最佳性能。该 Click 板只能在 3.3V 逻辑电压水平下运行。在使用不同逻辑电平的 MCU 之前,必须执行适当的逻辑电平转换。此外,该 Click 板配备了一个包含易于使用的功能和示例代码的库,可作为进一步开发的参考。

LR 14 Click hardware overview image

功能概述

开发板

Nucleo 32开发板搭载STM32F031K6 MCU,提供了一种经济且灵活的平台,适用于使用32引脚封装的STM32微控制器进行实验。该开发板具有Arduino™ Nano连接性,便于通过专用扩展板进行功能扩展,并且支持mbed,使其能够无缝集成在线资源。板载集成

ST-LINK/V2-1调试器/编程器,支持通过USB重新枚举,提供三种接口:虚拟串口(Virtual Com port)、大容量存储和调试端口。该开发板的电源供应灵活,可通过USB VBUS或外部电源供电。此外,还配备了三个LED指示灯(LD1用于USB通信,LD2用于电源

指示,LD3为用户可控LED)和一个复位按钮。STM32 Nucleo-32开发板支持多种集成开发环境(IDEs),如IAR™、Keil®和基于GCC的IDE(如AC6 SW4STM32),使其成为开发人员的多功能工具。

Nucleo 32 with STM32F031K6 MCU double side image

微控制器概述 

MCU卡片 / MCU

default

建筑

ARM Cortex-M0

MCU 内存 (KB)

32

硅供应商

STMicroelectronics

引脚数

32

RAM (字节)

4096

你完善了我!

配件

Click Shield for Nucleo-32是扩展您的开发板功能的理想选择,专为STM32 Nucleo-32引脚布局设计。Click Shield for Nucleo-32提供了两个mikroBUS™插座,可以添加来自我们不断增长的Click板™系列中的任何功能。从传感器和WiFi收发器到电机控制和音频放大器,我们应有尽有。Click Shield for Nucleo-32与STM32 Nucleo-32开发板兼容,为用户提供了一种经济且灵活的方式,使用任何STM32微控制器快速创建原型,并尝试各种性能、功耗和功能的组合。STM32 Nucleo-32开发板无需任何独立的探针,因为它集成了ST-LINK/V2-1调试器/编程器,并随附STM32全面的软件HAL库和各种打包的软件示例。这个开发平台为用户提供了一种简便且通用的方式,将STM32 Nucleo-32兼容开发板与他们喜欢的Click板™结合,应用于即将开展的项目中。

Click Shield for Nucleo-32 accessories 1 image

868MHz 直角橡胶天线是一款紧凑且多功能的无线通信解决方案。它在 868-915MHz 的频率范围内运行,确保最佳的信号接收和传输。天线具有 50 欧姆的阻抗,兼容多种设备和系统。其 2dB 的增益增强了信号强度并扩展了通信范围。垂直极化进一步提高了信号的清晰度。设计能够处理高达 50W 的输入功率,使其成为各种应用的坚固选择。这款天线长度仅为 48mm,既低调又实用。其 SMA 公头连接器确保与您的设备建立安全可靠的连接。无论您是在处理物联网设备、远程传感器,还是其他无线技术,868MHz 直角天线都能为您提供无缝通信所需的性能和灵活性。

LR 14 Click accessories 1 image

使用的MCU引脚

mikroBUS™映射器

Battery Monitoring
PA0
AN
Reset / ID SEL
PA11
RST
SPI Select / ID COMM
PA4
CS
SPI Clock
PB3
SCK
SPI Data OUT
PB4
MISO
SPI Data IN
PB5
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
NC
NC
PWM
NC
NC
INT
UART TX
PA10
TX
UART RX
PA9
RX
I2C Clock
PB6
SCL
I2C Data
PB7
SDA
NC
NC
5V
Ground
GND
GND
1

“仔细看看!”

Click board™ 原理图

LR 14 Click Schematic schematic

一步一步来

项目组装

Click Shield for Nucleo-144 front image hardware assembly

从选择您的开发板和Click板™开始。以Nucleo 32 with STM32F031K6 MCU作为您的开发板开始。

Click Shield for Nucleo-144 front image hardware assembly
Nucleo 144 with STM32L4A6ZG MCU front image hardware assembly
Stepper 22 Click front image hardware assembly
Prog-cut hardware assembly
Stepper 22 Click complete accessories setup image hardware assembly
Board mapper by product8 hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
Necto image step 5 hardware assembly
Necto image step 6 hardware assembly
STM32 M4 Clicker HA MCU/Select Step hardware assembly
Necto No Display image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Debug Image Necto Step hardware assembly

实时跟踪您的结果

应用程序输出

1. 应用程序输出 - 在调试模式下,“应用程序输出”窗口支持实时数据监控,直接提供执行结果的可视化。请按照提供的教程正确配置环境,以确保数据正确显示。

2. UART 终端 - 使用UART Terminal通过USB to UART converter监视数据传输,实现Click board™与开发系统之间的直接通信。请根据项目需求配置波特率和其他串行设置,以确保正常运行。有关分步设置说明,请参考提供的教程

3. Plot 输出 - Plot功能提供了一种强大的方式来可视化实时传感器数据,使趋势分析、调试和多个数据点的对比变得更加直观。要正确设置,请按照提供的教程,其中包含使用Plot功能显示Click board™读数的分步示例。在代码中使用Plot功能时,请使用以下函数:plot(insert_graph_name, variable_name);。这是一个通用格式,用户需要将“insert_graph_name”替换为实际图表名称,并将“variable_name”替换为要显示的参数。

软件支持

库描述

该库包含 LR 14 Click 驱动程序的 API。

关键功能:

  • lr14_cmd_run - 此功能将指定的命令发送到 Click 模块。

  • lr14_cmd_set - 此功能为 Click 模块的指定命令设置一个值。

  • lr14_cmd_get - 此功能用于从 Click 模块中获取指定命令的值。

开源

代码示例

完整的应用程序代码和一个现成的项目可以通过NECTO Studio包管理器直接安装到NECTO Studio 应用程序代码也可以在MIKROE的GitHub账户中找到。

/*!
 * @file main.c
 * @brief LR 14 Click Example.
 *
 * # Description
 * This example demonstrates the use of LR 14 Click board by showing
 * the communication between two Click boards configured in P2P network mode.
 *
 * The demo application is composed of two sections :
 *
 * ## Application Init
 * Initializes the driver and logger.
 *
 * ## Application Task
 * Application task is split in few stages:
 *  - LR14_POWER_UP:
 * Powers up the device, performs a device factory reset and reads system information.
 *  - LR14_CONFIG_EXAMPLE:
 * Configures device for the LoRa P2P network mode.
 *  - LR14_EXAMPLE:
 * Performs a LoRa P2P example by exchanging messages with another LR 14 Click board.
 *
 * ## Additional Function
 * - static void lr14_clear_app_buf ( void )
 * - static void lr14_log_app_buf ( void )
 * - static err_t lr14_process ( lr14_t *ctx )
 * - static err_t lr14_read_response ( lr14_t *ctx, uint8_t *rsp )
 * - static err_t lr14_power_up ( lr14_t *ctx )
 * - static err_t lr14_config_example ( lr14_t *ctx )
 * - static err_t lr14_example ( lr14_t *ctx )
 *
 * @author Stefan Filipovic
 *
 */

#include "board.h"
#include "log.h"
#include "lr14.h"
#include "conversions.h"
#include "generic_pointer.h"

#define DEMO_TEXT_MESSAGE   "MIKROE - LR 14 Click board"

static lr14_t lr14;
static log_t logger;

// Application buffer size
#define APP_BUFFER_SIZE     600
#define PROCESS_BUFFER_SIZE 200

static uint8_t app_buf[ APP_BUFFER_SIZE ] = { 0 };
static int32_t app_buf_len = 0;

/**
 * @brief Example states.
 * @details Predefined enum values for application example state.
 */
typedef enum
{
    LR14_POWER_UP = 1,
    LR14_CONFIG_EXAMPLE,
    LR14_EXAMPLE

} lr14_app_state_t;

static lr14_app_state_t app_state = LR14_POWER_UP;

/**
 * @brief LR 14 clearing application buffer.
 * @details This function clears memory of application buffer and reset its length.
 * @note None.
 */
static void lr14_clear_app_buf ( void );

/**
 * @brief LR 14 log application buffer.
 * @details This function logs data from application buffer to USB UART.
 * @note None.
 */
static void lr14_log_app_buf ( void );

/**
 * @brief LR 14 data reading function.
 * @details This function reads data from device and concatenates data to application buffer. 
 * @param[in] ctx : Click context object.
 * See #lr14_t object definition for detailed explanation.
 * @return @li @c  0 - Read some data.
 *         @li @c -1 - Nothing is read.
 * See #err_t definition for detailed explanation.
 * @note None.
 */
static err_t lr14_process ( lr14_t *ctx );

/**
 * @brief LR 14 read response function.
 * @details This function waits for a response message, reads and displays it on the USB UART.
 * @param[in] ctx : Click context object.
 * See #lr14_t object definition for detailed explanation.
 * @param[in] rsp  Expected response.
 * @return @li @c  0 - OK response.
 *         @li @c -2 - Timeout error.
 *         @li @c -3 - Command error.
 *         @li @c -4 - Unknown error.
 * See #err_t definition for detailed explanation.
 * @note None.
 */
static err_t lr14_read_response ( lr14_t *ctx, uint8_t *rsp );

/**
 * @brief LR 14 power up function.
 * @details This function powers up the device, performs device factory reset and reads system information.
 * @param[in] ctx : Click context object.
 * See #lr14_t object definition for detailed explanation.
 * @return @li @c    0 - OK.
 *         @li @c != 0 - Read response error.
 * See #err_t definition for detailed explanation.
 * @note None.
 */
static err_t lr14_power_up ( lr14_t *ctx );

/**
 * @brief LR 14 config example function.
 * @details This function configures device for LoRa P2P example.
 * @param[in] ctx : Click context object.
 * See #lr14_t object definition for detailed explanation.
 * @return @li @c    0 - OK.
 *         @li @c != 0 - Read response error.
 * See #err_t definition for detailed explanation.
 * @note None.
 */
static err_t lr14_config_example ( lr14_t *ctx );

/**
 * @brief LR 14 example function.
 * @details This function performs a LoRa P2P example by exchanging messages with another LR 14 Click board.
 * @param[in] ctx : Click context object.
 * See #lr14_t object definition for detailed explanation.
 * @return @li @c    0 - OK.
 *         @li @c != 0 - Read response error.
 * See #err_t definition for detailed explanation.
 * @note None.
 */
static err_t lr14_example ( lr14_t *ctx );

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    lr14_cfg_t lr14_cfg;  /**< Click config object. */

    /** 
     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
     */
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, " Application Init " );

    // Click initialization.
    lr14_cfg_setup( &lr14_cfg );
    LR14_MAP_MIKROBUS( lr14_cfg, MIKROBUS_1 );
    if ( UART_ERROR == lr14_init( &lr14, &lr14_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    log_info( &logger, " Application Task " );

    app_state = LR14_POWER_UP;
    log_printf( &logger, ">>> APP STATE - POWER UP <<<\r\n\n" );
}

void application_task ( void ) 
{
    switch ( app_state )
    {
        case LR14_POWER_UP:
        {
            if ( LR14_OK == lr14_power_up( &lr14 ) )
            {
                app_state = LR14_CONFIG_EXAMPLE;
                log_printf( &logger, ">>> APP STATE - CONFIG EXAMPLE <<<\r\n\n" );
            }
            break;
        }
        case LR14_CONFIG_EXAMPLE:
        {
            if ( LR14_OK == lr14_config_example( &lr14 ) )
            {
                app_state = LR14_EXAMPLE;
                log_printf( &logger, ">>> APP STATE - EXAMPLE <<<\r\n\n" );
            }
            break;
        }
        case LR14_EXAMPLE:
        {
            lr14_example( &lr14 );
            break;
        }
        default:
        {
            log_error( &logger, " APP STATE." );
            break;
        }
    }
}

int main ( void ) 
{
    /* Do not remove this line or clock might not be set correctly. */
    #ifdef PREINIT_SUPPORTED
    preinit();
    #endif
    
    application_init( );
    
    for ( ; ; ) 
    {
        application_task( );
    }

    return 0;
}

static void lr14_clear_app_buf ( void ) 
{
    memset( app_buf, 0, app_buf_len );
    app_buf_len = 0;
}

static void lr14_log_app_buf ( void )
{
    for ( int32_t buf_cnt = 0; buf_cnt < app_buf_len; buf_cnt++ )
    {
        log_printf( &logger, "%c", app_buf[ buf_cnt ] );
    }
}

static err_t lr14_process ( lr14_t *ctx ) 
{
    uint8_t rx_buf[ PROCESS_BUFFER_SIZE ] = { 0 };
    int32_t overflow_bytes = 0;
    int32_t rx_cnt = 0;
    int32_t rx_size = lr14_generic_read( ctx, rx_buf, PROCESS_BUFFER_SIZE );
    if ( ( rx_size > 0 ) && ( rx_size <= APP_BUFFER_SIZE ) ) 
    {
        if ( ( app_buf_len + rx_size ) > APP_BUFFER_SIZE ) 
        {
            overflow_bytes = ( app_buf_len + rx_size ) - APP_BUFFER_SIZE;
            app_buf_len = APP_BUFFER_SIZE - rx_size;
            memmove ( app_buf, &app_buf[ overflow_bytes ], app_buf_len );
            memset ( &app_buf[ app_buf_len ], 0, overflow_bytes );
        }
        for ( rx_cnt = 0; rx_cnt < rx_size; rx_cnt++ ) 
        {
            if ( rx_buf[ rx_cnt ] ) 
            {
                app_buf[ app_buf_len++ ] = rx_buf[ rx_cnt ];
            }
        }
        return LR14_OK;
    }
    return LR14_ERROR;
}

static err_t lr14_read_response ( lr14_t *ctx, uint8_t *rsp ) 
{
    #define READ_RESPONSE_TIMEOUT_MS    120000
    uint32_t timeout_cnt = 0;
    lr14_clear_app_buf ( );
    lr14_process( ctx );
    while ( ( 0 == strstr( app_buf, rsp ) ) &&
            ( 0 == strstr( app_buf, LR14_RSP_ERROR ) ) &&
            ( 0 == strstr( app_buf, LR14_RSP_PARAM_ERROR ) ) &&
            ( 0 == strstr( app_buf, LR14_RSP_BUSY_ERROR ) ) &&
            ( 0 == strstr( app_buf, LR14_RSP_TEST_PARAM_OVERFLOW ) ) &&
            ( 0 == strstr( app_buf, LR14_RSP_NO_CLASSB_ENABLE ) ) &&
            ( 0 == strstr( app_buf, LR14_RSP_NO_NETWORK_JOINED ) ) &&
            ( 0 == strstr( app_buf, LR14_RSP_RX_ERROR ) ) )
    {
        lr14_process( ctx );
        if ( timeout_cnt++ > READ_RESPONSE_TIMEOUT_MS )
        {
            lr14_clear_app_buf( );
            log_error( &logger, " Timeout!" );
            return LR14_ERROR_TIMEOUT;
        }
        Delay_ms( 1 );
    }
    Delay_ms ( 200 );
    lr14_process( ctx );
    if ( strstr( app_buf, rsp ) )
    {
        lr14_log_app_buf( );
        log_printf( &logger, "--------------------------------\r\n" );
        return LR14_OK;
    }
    log_error( &logger, " CMD!" );
    return LR14_ERROR_CMD;
}

static err_t lr14_power_up ( lr14_t *ctx )
{
    err_t error_flag = LR14_OK;
    
    log_printf( &logger, ">>> Reset device.\r\n" );
    lr14_reset_device( &lr14 );
    while ( LR14_OK == lr14_process( ctx ) )
    {
        lr14_log_app_buf( );
        lr14_clear_app_buf ( );
    }
    log_printf( &logger, "--------------------------------\r\n" );

    log_printf( &logger, ">>> Check communication.\r\n" );
    lr14_cmd_run( &lr14, LR14_CMD_AT );
    error_flag |= lr14_read_response( &lr14, LR14_RSP_OK );

    log_printf( &logger, ">>> Factory reset.\r\n" );
    lr14_cmd_run( &lr14, LR14_CMD_FACTORY_RESET );
    error_flag |= lr14_read_response( &lr14, LR14_RSP_INITIAL );

    log_printf( &logger, ">>> Toggle command echo.\r\n" );
    lr14_cmd_run( &lr14, LR14_CMD_TOGGLE_ECHO );
    error_flag |= lr14_read_response( &lr14, LR14_RSP_OK );
    
    log_printf( &logger, ">>> Get device model ID.\r\n" );
    lr14_cmd_get( ctx, LR14_CMD_GET_MODEL_ID );
    error_flag |= lr14_read_response( ctx, LR14_RSP_OK );

    log_printf( &logger, ">>> Get device firmware version.\r\n" );
    lr14_cmd_get( ctx, LR14_CMD_GET_FW_VERSION );
    error_flag |= lr14_read_response( ctx, LR14_RSP_OK );

    log_printf( &logger, ">>> Get device serial number.\r\n" );
    lr14_cmd_get( ctx, LR14_CMD_GET_SERIAL_NUMBER );
    error_flag |= lr14_read_response( ctx, LR14_RSP_OK );

    return error_flag;
}

static err_t lr14_config_example ( lr14_t *ctx )
{
    err_t error_flag = LR14_OK;
    #define NETWORK_WORK_MODE_P2P_LORA "0"
    log_printf( &logger, ">>> Get network work mode.\r\n" );
    lr14_cmd_get( ctx, LR14_CMD_NETWORK_WORK_MODE );
    error_flag |= lr14_read_response( ctx, LR14_RSP_OK );
    if ( !strstr( app_buf, NETWORK_WORK_MODE_P2P_LORA ) )
    {
        log_printf( &logger, ">>> Set LoRa P2P network work mode.\r\n" );
        lr14_cmd_set( ctx, LR14_CMD_NETWORK_WORK_MODE, NETWORK_WORK_MODE_P2P_LORA );
        error_flag |= lr14_read_response( ctx, LR14_RSP_OK );
    }
    #define P2P_MODE_FREQUENCY "868000000"
    log_printf( &logger, ">>> Set P2P mode frequency to 868 MHz.\r\n" );
    lr14_cmd_set( ctx, LR14_CMD_P2P_MODE_FREQUENCY, P2P_MODE_FREQUENCY );
    error_flag |= lr14_read_response( ctx, LR14_RSP_OK );

    #define P2P_MODE_SPREADING_FACTOR "12"
    log_printf( &logger, ">>> Set P2P mode spreading factor to 12.\r\n" );
    lr14_cmd_set( ctx, LR14_CMD_P2P_MODE_SPREADING_FACTOR, P2P_MODE_SPREADING_FACTOR );
    error_flag |= lr14_read_response( ctx, LR14_RSP_OK );

    #define P2P_MODE_BANDWIDTH "0"
    log_printf( &logger, ">>> Set P2P mode bandwidth to 125 kHz.\r\n" );
    lr14_cmd_set( ctx, LR14_CMD_P2P_MODE_BANDWIDTH, P2P_MODE_BANDWIDTH );
    error_flag |= lr14_read_response( ctx, LR14_RSP_OK );

    #define P2P_MODE_CODE_RATE "0"
    log_printf( &logger, ">>> Set P2P mode code rate to 4/5.\r\n" );
    lr14_cmd_set( ctx, LR14_CMD_P2P_MODE_CODE_RATE, P2P_MODE_CODE_RATE );
    error_flag |= lr14_read_response( ctx, LR14_RSP_OK );

    #define P2P_MODE_PREAMBLE_LENGTH "8"
    log_printf( &logger, ">>> Set P2P mode preamble length to 8.\r\n" );
    lr14_cmd_set( ctx, LR14_CMD_P2P_MODE_PREAMBLE_LENGTH, P2P_MODE_PREAMBLE_LENGTH );
    error_flag |= lr14_read_response( ctx, LR14_RSP_OK );

    #define P2P_MODE_TX_POWER "22"
    log_printf( &logger, ">>> Set P2P mode TX power to 22 dBm.\r\n" );
    lr14_cmd_set( ctx, LR14_CMD_P2P_MODE_TX_POWER, P2P_MODE_TX_POWER );
    error_flag |= lr14_read_response( ctx, LR14_RSP_OK );

    return error_flag;
}

static err_t lr14_example ( lr14_t *ctx )
{
    err_t error_flag = LR14_OK;
    uint8_t msg_hex[ 201 ] = { 0 };
    uint8_t byte_hex[ 3 ] = { 0 };
    uint8_t rssi[ 10 ] = { 0 };
    uint8_t snr[ 10 ] = { 0 };
    uint8_t cnt = 0;

    memset( msg_hex, 0, sizeof ( msg_hex ) );
    for ( cnt = 0; ( cnt < strlen ( DEMO_TEXT_MESSAGE ) ) && ( cnt < 100 ); cnt++ ) 
    {
        uint8_to_hex ( DEMO_TEXT_MESSAGE[ cnt ], byte_hex );
        strcat ( msg_hex, byte_hex );
    }
    log_printf( &logger, ">>> Send message: \"%s\".\r\n", ( char * ) DEMO_TEXT_MESSAGE );
    lr14_cmd_set( ctx, LR14_CMD_P2P_TX_MODE, msg_hex );
    error_flag |= lr14_read_response( ctx, LR14_EVT_TX_P2P );
    
    memset( msg_hex, 0, sizeof ( msg_hex ) );
    #define P2P_RX_MODE_TIMEOUT "30000"
    log_printf( &logger, ">>> Go to P2P RX mode with a 30s timeout.\r\n" );
    lr14_cmd_set( ctx, LR14_CMD_P2P_RX_MODE, P2P_RX_MODE_TIMEOUT );
    error_flag |= lr14_read_response( ctx, LR14_EVT_RX_P2P );
    
    if ( !strstr( app_buf, LR14_EVT_RX_P2P_ERROR ) && 
         !strstr( app_buf, LR14_EVT_RX_P2P_TIMEOUT ) )
    {
        uint8_t * __generic_ptr start_ptr = strstr( app_buf, LR14_EVT_RX_P2P );
        uint8_t * __generic_ptr end_ptr = NULL;
        if ( start_ptr )
        {
            start_ptr = start_ptr + strlen ( LR14_EVT_RX_P2P ) + 1;
            end_ptr = strstr ( start_ptr, ":" );
            memcpy ( rssi, start_ptr, end_ptr - start_ptr );
            
            start_ptr = end_ptr + 1;
            end_ptr = strstr ( start_ptr, ":" );
            memcpy ( snr, start_ptr, end_ptr - start_ptr );

            start_ptr = end_ptr + 1;
            end_ptr = strstr ( start_ptr, "\r\n" );
            memcpy ( msg_hex, start_ptr, end_ptr - start_ptr );

            for ( cnt = 0; cnt < strlen ( msg_hex ); cnt += 2 )
            {
                msg_hex[ cnt / 2 ] = hex_to_uint8 ( &msg_hex [ cnt ] );
            }
            msg_hex[ cnt / 2 ] = 0;
            log_printf( &logger, ">>> Parse received message.\r\n" );
            log_printf ( &logger, " Message: %s\r\n", msg_hex );
            log_printf ( &logger, " RSSI: %s\r\n", rssi );
            log_printf ( &logger, " SNR: %s\r\n", snr );
            log_printf( &logger, "--------------------------------\r\n" );
        }
    }
    
    return error_flag;
}

// ------------------------------------------------------------------------ END

额外支持

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