NRF52833nrf52840笔记（18）广播设置Longrange 模式（拓展大广播包）

1概述

参考网址：网址 Long Range 是BLE 5.0中新增加的特性，主要是通过扩频的方式，提高了天线接收的灵敏度，同时将最大的发送功率，从4.0/4.1/4.2中的10mW增大到5.0的100mW。相对于BLE来说，确实增加了通信的距离。

nRF52832 不支持 code 模式

2：代码编程

#include "ble_adv.h" #include "ble_advdata.h" #include "app_error.h" uint8_t beacon_info[23] = { 0x02, 0x15, 0xE2,0xC5,0x6D,0xB5,0xDF,0xFB,0x48,0xD2,0xB0,0x60,0xD0,0xF5,0xA7,0x10,0x96,0xE0, // uuid 0X00,0x00, // major 0x00,0x00, // mainor 0xC3 // rssi }; static uint8_t m_enc_advdata[BLE_GAP_ADV_SET_DATA_SIZE_EXTENDED_MAX_SUPPORTED]; static uint8_t m_adv_handle = BLE_GAP_ADV_SET_HANDLE_NOT_SET; ble_gap_adv_data_t m_adv_data = { .adv_data = { .p_data = m_enc_advdata, .len = BLE_GAP_ADV_SET_DATA_SIZE_EXTENDED_MAX_SUPPORTED, }, .scan_rsp_data= { .p_data=NULL, .len =0, } }; /******************************** * ble ¹ã²¥³õʼ»¯ ****************************/ uint8_t test_data[40]; void ble_adv_init(void) { uint32_t err_code; ble_advdata_t advdata; ble_advdata_manuf_data_t manuf_specific_data; memset(&manuf_specific_data,0,sizeof(manuf_specific_data)); manuf_specific_data.company_identifier = 0x00C7;//0x00C7;//0x0059; manuf_specific_data.data.p_data = (uint8_t *) beacon_info; manuf_specific_data.data.size = sizeof（beacon_info）; // Build and set advertising data. memset(&advdata, 0, sizeof(advdata)); advdata.name_type = BLE_ADVDATA_NO_NAME; advdata.flags = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE; advdata.p_manuf_specific_data = &manuf_specific_data; err_code = ble_advdata_encode(&advdata, m_adv_data.adv_data.p_data, &m_adv_data.adv_data.len); APP_ERROR_CHECK(err_code); // Initialize advertising parameters (used when starting advertising). ble_gap_adv_params_t adv_params; memset(&adv_params, 0, sizeof(adv_params)); adv_params.primary_phy = BLE_GAP_PHY_CODED;//BLE_GAP_PHY_1MBPS adv_params.secondary_phy = BLE_GAP_PHY_CODED; adv_params.properties.type = BLE_GAP_ADV_TYPE_EXTENDED_CONNECTABLE_NONSCANNABLE_UNDIRECTED;//; adv_params.p_peer_addr = NULL; adv_params.filter_policy = BLE_GAP_ADV_FP_ANY; adv_params.interval = 64; adv_params.duration = 0; // Never time out. err_code = sd_ble_gap_adv_set_configure(&m_adv_handle, &m_adv_data, &adv_params); APP_ERROR_CHECK(err_code); } void ble_adv_start(void) { ret_code_t err_code; err_code = sd_ble_gap_adv_start(m_adv_handle, 1); APP_ERROR_CHECK(err_code); }

实际测量和应用 1：广播longrange模式下，常规的BLE主机无法扫描到该设备，建议双方同时处于longrange模式下，进行相互连接和通信 2. 远距离发起连接容易超时导致连接失败，因为BLE连接需要比较严格的通信时序，因为longrang模式下数据速率会降低些

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