nRF52一从多主

从机例程目录：
…\nRF5_SDK_15.3.0_59ac345\examples\ble_peripheral\experimental\ble_app_multiperipheral
将例程改为收发多个数据
修改函数

uint32_t ble_nus_init(ble_nus_t * p_nus, ble_nus_init_t const * p_nus_init)

// Add Button characteristic.TX
    memset(&add_char_params, 0, sizeof(add_char_params));
    add_char_params.uuid              = LBS_UUID_BUTTON_CHAR;
    add_char_params.uuid_type         = p_lbs->uuid_type;
    add_char_params.init_len          = sizeof(uint8_t);
    add_char_params.max_len           = BLE_LBS_MAX_DATA_LEN;//sizeof(uint8_t);
    add_char_params.is_var_len        = true;
    add_char_params.char_props.read   = 1;
    add_char_params.char_props.notify = 1;
    add_char_params.char_props.write  = 1;

    add_char_params.read_access       = SEC_OPEN;
    add_char_params.cccd_write_access = SEC_OPEN;

    err_code = characteristic_add(p_lbs->service_handle,
                                  &add_char_params,
                                  &p_lbs->button_char_handles);
    if (err_code != NRF_SUCCESS)
    {
        return err_code;
    }

    // Add LED characteristic.RX
    memset(&add_char_params, 0, sizeof(add_char_params));
    add_char_params.uuid             = LBS_UUID_LED_CHAR;
    add_char_params.uuid_type        = p_lbs->uuid_type;
    add_char_params.init_len         = sizeof(uint8_t);
    add_char_params.is_var_len       = true;
    add_char_params.max_len          = BLE_LBS_MAX_DATA_LEN;//sizeof(uint8_t);
    add_char_params.char_props.read  = 1;
    add_char_params.char_props.write = 1;

    add_char_params.read_access  = SEC_OPEN;
    add_char_params.write_access = SEC_OPEN;

上面在原例程基础上修改了：
按键部分增加write属性：add_char_params.char_props.write = 1;
led和button都增加：

add_char_params.is_var_len       = true;//TRUE表示长度可变

led和button都修改:

add_char_params.max_len          = BLE_LBS_MAX_DATA_LEN;//最大长度

BLE_LBS_MAX_DATA_LEN我是拷贝的串口例程的宏改了个名字:

/**@brief   Maximum length of data (in bytes) that can be transmitted to the peer by the Nordic LBS service module. */
#if defined(NRF_SDH_BLE_GATT_MAX_MTU_SIZE) && (NRF_SDH_BLE_GATT_MAX_MTU_SIZE != 0)
    #define BLE_LBS_MAX_DATA_LEN (NRF_SDH_BLE_GATT_MAX_MTU_SIZE - OPCODE_LENGTH - HANDLE_LENGTH)
#else
    #define BLE_LBS_MAX_DATA_LEN (BLE_GATT_MTU_SIZE_DEFAULT - OPCODE_LENGTH - HANDLE_LENGTH)
    #warning NRF_SDH_BLE_GATT_MAX_MTU_SIZE is not defined.
#endif

add_char_params.max_len不改的话测试收发多个数据会出现
在这里插入图片描述
例程中接收的函数类型

typedef void (*ble_lbs_led_write_handler_t) (uint16_t conn_handle, ble_lbs_t * p_lbs, uint8_t new_state);

改成

typedef void (*ble_lbs_led_write_handler_t) (uint16_t conn_handle, ble_lbs_t * p_lbs, uint8_t const* data,uint8_t len);

我构造的发送函数

uint32_t BleSnd(uint16_t conn_handle, ble_lbs_t * p_lbs, uint8_t * p_data, uint16_t len)
{
    ble_gatts_hvx_params_t params;

    memset(&params, 0, sizeof(params));
    params.type   = BLE_GATT_HVX_NOTIFICATION;
    params.handle = p_lbs->button_char_handles.value_handle;
    params.p_data = p_data;
    params.p_len  = &len;

    return sd_ble_gatts_hvx(conn_handle, &params);
}

Nordic的按键库写地有个问题
在这里插入图片描述
实际由于在app_button_init中

#if defined(BUTTON_HIGH_ACCURACY_ENABLED) && (BUTTON_HIGH_ACCURACY_ENABLED == 1)
        nrf_drv_gpiote_in_config_t config = GPIOTE_CONFIG_IN_SENSE_TOGGLE(p_btn->hi_accuracy);
#else
        nrf_drv_gpiote_in_config_t config = GPIOTE_CONFIG_IN_SENSE_TOGGLE(false);
#endif

不会按你设置的false触发而是有变化就触发
所以要增加一段

#if defined(BUTTON_HIGH_ACCURACY_ENABLED) && (BUTTON_HIGH_ACCURACY_ENABLED == 1)
        nrf_drv_gpiote_in_config_t config = GPIOTE_CONFIG_IN_SENSE_TOGGLE(p_btn->hi_accuracy);
#else
        nrf_drv_gpiote_in_config_t config = GPIOTE_CONFIG_IN_SENSE_TOGGLE(false);
#endif
//增加的
        if(p_buttons->active_state == false)
            config.sense = NRF_GPIOTE_POLARITY_HITOLO;
        if(p_buttons->active_state == true)
            config.sense = NRF_GPIOTE_POLARITY_LOTOHI;

我实现的是按按键1给第一个连接主机发消息按按键2给第二个连接的主机发消息按按键3发给两个设备

static void buttons_init(void)
{
    ret_code_t err_code;

    //The array must be static because a pointer to it will be saved in the button handler module.
    static app_button_cfg_t buttons[] =
    {
        {BSP_BUTTON_0, false, BUTTON_PULL, button_event_handler},
        {BSP_BUTTON_1, false, BUTTON_PULL, button_event_handler},
        {BSP_BUTTON_2, false, BUTTON_PULL, button_event_handler},
    };

    err_code = app_button_init(buttons, ARRAY_SIZE(buttons),
                               BUTTON_DETECTION_DELAY);
    APP_ERROR_CHECK(err_code);
}

static void button_event_handler(uint8_t pin_no, uint8_t button_action)
{
    ret_code_t err_code;
    static uint8_t buff[10] = {'a','b','c','d',0,  'A','B','C','D',0};
    switch (pin_no)
    {
        case BSP_BUTTON_0:
//            err_code = led_status_send_to_all(button_action);
//            if (err_code == NRF_SUCCESS)
//            {
//                NRF_LOG_INFO("Sent button state change to all connected centrals.");
//            }
            buff[4]++;
            err_code = BleSnd(0, &m_lbs, buff, 5);
            if (err_code != NRF_SUCCESS &&
                err_code != BLE_ERROR_INVALID_CONN_HANDLE &&
                err_code != NRF_ERROR_INVALID_STATE &&
                err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING)
            {
                APP_ERROR_CHECK(err_code);
                NRF_LOG_DEBUG("<Err> ... Ble snd on connection handle -0-");
            }
            if (err_code == NRF_SUCCESS)
            {
                NRF_LOG_DEBUG("<SUCC> ... Ble snd on connection handle -0-.");
            }
            break;
        case BSP_BUTTON_1:
            buff[9]++;
            err_code = BleSnd(1, &m_lbs, &buff[5], 5);
            if (err_code != NRF_SUCCESS &&
                err_code != BLE_ERROR_INVALID_CONN_HANDLE &&
                err_code != NRF_ERROR_INVALID_STATE &&
                err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING)
            {
                APP_ERROR_CHECK(err_code);
                NRF_LOG_DEBUG("<Err> ... Ble snd on connection handle -1-");
            }
            if (err_code == NRF_SUCCESS)
            {
                NRF_LOG_DEBUG("<SUCC> ... Ble snd on connection handle -1-.");
            }
            break;
        case BSP_BUTTON_2:
            err_code = led_status_send_to_all(button_action);
            if (err_code == NRF_SUCCESS)
            {
                NRF_LOG_INFO("Sent button state change to all connected centrals.");
            }
            break;
        default:
            APP_ERROR_HANDLER(pin_no);
            break;
    }
}

在这里插入图片描述

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