51822 proximity

主要来自http://www.cnblogs.com/bhlsheji/p/5340092.html

ble_app_proximity 程序，事实上跟防丢有关的程序

打开sdk包路径：D:\myfile\test\examples\ble_peripheral\ble_app_proximity\pca10028\s130\arm5_no_packs

1. TX Power Service 发射功率服务：

该服务主要条件蓝牙的发射功率，从而影响设备与手机蓝牙通信距离：

/**@brief Function for initializing the TX Power Service.

#define TX_POWER_LEVEL (0)

static void tps_init(void)
{
uint32_t err_code;
ble_tps_init_t tps_init_obj;

memset(&tps_init_obj, 0, sizeof(tps_init_obj));
tps_init_obj.initial_tx_power_level = TX_POWER_LEVEL;

BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&tps_init_obj.tps_attr_md.read_perm);
BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&tps_init_obj.tps_attr_md.write_perm);

err_code = ble_tps_init(&m_tps, &tps_init_obj);
APP_ERROR_CHECK(err_code);
}

TX_POWER_LEVEL的范围是4 到-20db 随着数据的减小，通信距离变短

2.Immediate Alert Service 即时报警服务

该服务能够通过手机APP 找到设备蓝牙建立连接之后，在手机的 APP中有 Find Mebutton有效，按下Find Me ，开发板的灯会亮，这个时候 Find Mebutton 变成Silent Mebutton ,在按下Silent Mebutton 相应灯会灭，相比5介绍的Immediate Alert Service client 是一个相反的寻找方式。

/**@brief Function for initializing the Immediate Alert Service.
*/
static void ias_init(void)
{
uint32_t err_code;
ble_ias_init_t ias_init_obj;

memset(&ias_init_obj, 0, sizeof(ias_init_obj));
ias_init_obj.evt_handler = on_ias_evt;

err_code = ble_ias_init(&m_ias, &ias_init_obj);
APP_ERROR_CHECK(err_code);
}

通过点击手机APP中的 Find Mebutton 或Silent Mebutton切换，会进入函数执行相应的灯ON/OFF，

static void on_ias_evt(ble_ias_t * p_ias, ble_ias_evt_t * p_evt)
{
switch (p_evt->evt_type)
{
case BLE_IAS_EVT_ALERT_LEVEL_UPDATED:

alert_signal(p_evt->params.alert_level);
break;//BLE_IAS_EVT_ALERT_LEVEL_UPDATED

default:
// No implementation needed.
break;
}
}

通过手机直接控制设备或在蓝牙断开时，设备会执行灯闪烁或报警

/**@brief Function for the Signals alert event from Immediate Alert or Link Loss services.
*
* @param[in] alert_level Requested alert level.
*/
static void alert_signal(uint8_t alert_level)
{
uint32_t err_code;

switch (alert_level)
{
case BLE_CHAR_ALERT_LEVEL_NO_ALERT:
err_code = bsp_indication_set(BSP_INDICATE_ALERT_OFF);
APP_ERROR_CHECK(err_code);
NRF_LOG_DEBUG("BLE_CHAR_ALERT_LEVEL_NO_ALERT\r\n");
break;//BLE_CHAR_ALERT_LEVEL_NO_ALERT

case BLE_CHAR_ALERT_LEVEL_MILD_ALERT:
err_code = bsp_indication_set(BSP_INDICATE_ALERT_0);
APP_ERROR_CHECK(err_code);
NRF_LOG_DEBUG("BLE_CHAR_ALERT_LEVEL_MILD_ALERT\r\n");
break;//BLE_CHAR_ALERT_LEVEL_MILD_ALERT

case BLE_CHAR_ALERT_LEVEL_HIGH_ALERT:
NRF_LOG_DEBUG("BLE_CHAR_ALERT_LEVEL_HIGH_ALERT\r\n");
err_code = bsp_indication_set(BSP_INDICATE_ALERT_3);
APP_ERROR_CHECK(err_code);
break;//BLE_CHAR_ALERT_LEVEL_HIGH_ALERT

default:
// No implementation needed.
break;
}
}

3.Link Loss Service 连接丢失服务

当连接丢失之后（有可能是电池没电或者分离APP太远）都会导致连接丢失事件，丢失后会通过通知的方式发送到手机APP，手机依据

该事件做出响应，程序中使用通知的方式显示出来，

/**@brief Function for initializing the Link Loss Service.
*/
static void lls_init(void)
{
uint32_t err_code;
ble_lls_init_t lls_init_obj;

// Initialize Link Loss Service
memset(&lls_init_obj, 0, sizeof(lls_init_obj));

lls_init_obj.evt_handler         = on_lls_evt;
    lls_init_obj.error_handler       = service_error_handler;
    lls_init_obj.initial_alert_level = INITIAL_LLS_ALERT_LEVEL;

BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&lls_init_obj.lls_attr_md.read_perm);
BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&lls_init_obj.lls_attr_md.write_perm);

err_code = ble_lls_init(&m_lls, &lls_init_obj);
APP_ERROR_CHECK(err_code);
}

蓝牙断开或者关机会进入 on_lls_evt 函数中，执行相应的报警或灯的控制

/**@brief Function for handling Link Loss events.
*
* @details This function will be called for all Link Loss events which are passed to the
* application.
*
* @param[in] p_lls Link Loss structure.
* @param[in] p_evt Event received from the Link Loss service.
*/
static void on_lls_evt(ble_lls_t * p_lls, ble_lls_evt_t * p_evt)
{
switch (p_evt->evt_type)
{
case BLE_LLS_EVT_LINK_LOSS_ALERT:

alert_signal(p_evt->params.alert_level);
break;//BLE_LLS_EVT_LINK_LOSS_ALERT

default:
// No implementation needed.
break;
}
}

4. Battery Service 电池服务

通过AD采样电池电压，发送到手机APP

5. Immediate Alert Service client -location role of the Find Me profile 定位器服务

该服务能够使用按键报警服务，按键按下，在按键处理程序中设置好报警的级别之后，通过蓝牙发送到手机APP,APP已经报警级别做不同的动作，

程序通过按键控制手机响铃和停止响铃。

/**@brief Function for initializing the immediate alert service client.

static void ias_client_init(void)
{
uint32_t err_code;
ble_ias_c_init_t ias_c_init_obj;

memset(&ias_c_init_obj, 0, sizeof(ias_c_init_obj));

m_is_high_alert_signalled = false;

ias_c_init_obj.evt_handler = on_ias_c_evt;
ias_c_init_obj.error_handler = service_error_handler;

err_code = ble_ias_c_init(&m_ias_c, &ias_c_init_obj);
APP_ERROR_CHECK(err_code);
}

通过按键来控制手机报警，按一下手机报警响，再次按下手机报警关

/**@brief Function for initializing buttons and leds.
*
* @param[out] p_erase_bonds Will be true if the clear bonding button was pressed to wake the application up.
*/
static void buttons_leds_init(bool * p_erase_bonds)
{
bsp_event_t startup_event;

uint32_t err_code = bsp_init(BSP_INIT_LED|BSP_INIT_BUTTONS,
APP_TIMER_TICKS(100, APP_TIMER_PRESCALER),
bsp_event_handler);//BSP_INIT_LED |BSP_INIT_BUTTONS,

APP_ERROR_CHECK(err_code);

err_code = bsp_btn_ble_init(NULL, &startup_event);
APP_ERROR_CHECK(err_code);

*p_erase_bonds = (startup_event == BSP_EVENT_CLEAR_BONDING_DATA);
}

/**@brief Function for handling events from the BSP module.
*
* @param[in] event Event generated when button is pressed.
*/
static void bsp_event_handler(bsp_event_t event)
{

uint32_t err_code;

switch (event)
{
case BSP_EVENT_SLEEP:
// sleep_mode_enter();
break;//BSP_EVENT_SLEEP

case BSP_EVENT_DISCONNECT:
err_code = sd_ble_gap_disconnect(m_ias_c.conn_handle,
BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
if (err_code != NRF_ERROR_INVALID_STATE)
{
APP_ERROR_CHECK(err_code);
}
break;//BSP_EVENT_DISCONNECT

case BSP_EVENT_KEY_0:
{
if (m_is_ias_present)
{

if (!m_is_high_alert_signalled)
{
err_code =
ble_ias_c_send_alert_level(&m_ias_c, BLE_CHAR_ALERT_LEVEL_HIGH_ALERT);
NRF_LOG_DEBUG("m_is_high_alert_signalled000\r\n");
}
else
{
err_code = ble_ias_c_send_alert_level(&m_ias_c, BLE_CHAR_ALERT_LEVEL_NO_ALERT);
NRF_LOG_DEBUG("m_is_high_alert_signalled111\r\n");
}

if (err_code == NRF_SUCCESS)
{
m_is_high_alert_signalled = !m_is_high_alert_signalled;

}
else if (
(err_code != BLE_ERROR_NO_TX_PACKETS)
&&
(err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING)
&&
(err_code != NRF_ERROR_NOT_FOUND)
)
{
APP_ERROR_HANDLER(err_code);
}
}

}break;//BSP_EVENT_KEY_0

case BSP_EVENT_KEY_1: // STOP_ALERTING_BUTTON_ID
err_code = bsp_indication_set(BSP_INDICATE_ALERT_OFF);
APP_ERROR_CHECK(err_code);
break;//BSP_EVENT_KEY_1

default:
break;

}

}

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