nrf51822 --- 广播的类型

1.目的

设置广播的类型

2.分析

在项目中经常使用到各种不同的广播类型，比如只做广播而不能被连接，且不定性广播的时候可以设置为BLE_GAP_ADV_TYPE_ADV_NONCONN_IND，

假如只指定MAC地址的设备才能连上设备，这个时候就可以用定向广播

3.平台：

协议栈版本：SDK8.0.0

编译软件：keil 5.14

硬件平台：nrf51822最小系统

例子：SDK 10.0.0\examples\ble_peripheral\ble_app_uart\pca10028\s110\arm4

4.步骤

广播类型有如下选择。

BLE_GAP_ADV_TYPE_ADV_IND ：可以被任何主机连接，不定向广播

BLE_GAP_ADV_TYPE_ADV_DIRECT_IND：可以连接，定向广播，（只能被指定的设备连接）

BLE_GAP_ADV_TYPE_ADV_SCAN_IND：可以被扫面，不定向

BLE_GAP_ADV_TYPE_ADV_NONCONN_IND：不可以连接，不定向

/**@defgroup BLE_GAP_ADV_TYPES GAP Advertising types
* @{ */
#define BLE_GAP_ADV_TYPE_ADV_IND          0x00   /**< Connectable undirected. */
#define BLE_GAP_ADV_TYPE_ADV_DIRECT_IND   0x01   /**< Connectable directed. */
#define BLE_GAP_ADV_TYPE_ADV_SCAN_IND     0x02   /**< Scannable undirected. */
#define BLE_GAP_ADV_TYPE_ADV_NONCONN_IND  0x03   /**< Non connectable undirected. */
/**@} */

uint32_t ble_advertising_start(ble_adv_mode_t advertising_mode)
{
uint32_t             err_code;
ble_gap_adv_params_t adv_params;

m_adv_mode_current = advertising_mode;

uint32_t             count = 0;

// Verify if there are any pending flash operations. If so, delay starting advertising until
// the flash operations are complete.
err_code = pstorage_access_status_get(&count);
if (err_code == NRF_ERROR_INVALID_STATE)
{
// Pstorage is not initialized, i.e. not in use.
count = 0;
}
else if (err_code != NRF_SUCCESS)
{
return err_code;
}

if (count != 0)
{
m_advertising_start_pending = true;
return NRF_SUCCESS;
}

// Fetch the peer address.
ble_advertising_peer_address_clear();
if (  ((m_adv_modes_config.ble_adv_directed_enabled)
&& m_adv_mode_current == BLE_ADV_MODE_DIRECTED)
||((m_adv_modes_config.ble_adv_directed_slow_enabled)
&& m_adv_mode_current == BLE_ADV_MODE_DIRECTED_SLOW))
{
if (m_evt_handler != NULL)
{
m_peer_addr_reply_expected = true;
m_evt_handler(BLE_ADV_EVT_PEER_ADDR_REQUEST);
}
else
{
m_peer_addr_reply_expected = false;
}
}

// If a mode is disabled, continue to the next mode. I.e fast instead of direct, slow instead of fast, idle instead of slow.
if (  (m_adv_mode_current == BLE_ADV_MODE_DIRECTED)
&&(!m_adv_modes_config.ble_adv_directed_enabled || !peer_address_exists(m_peer_address.addr)))
{
m_adv_mode_current = BLE_ADV_MODE_DIRECTED_SLOW;
}
if (  (m_adv_mode_current == BLE_ADV_MODE_DIRECTED_SLOW)
&&(!m_adv_modes_config.ble_adv_directed_slow_enabled || !peer_address_exists(m_peer_address.addr)))
{
m_adv_mode_current = BLE_ADV_MODE_FAST;
}
if (!m_adv_modes_config.ble_adv_fast_enabled && m_adv_mode_current == BLE_ADV_MODE_FAST)
{
m_adv_mode_current = BLE_ADV_MODE_SLOW;
}
if (!m_adv_modes_config.ble_adv_slow_enabled && m_adv_mode_current == BLE_ADV_MODE_SLOW)
{
m_adv_mode_current = BLE_ADV_MODE_IDLE;
m_adv_evt          = BLE_ADV_EVT_IDLE;
}

// Fetch the whitelist.
if (   (m_evt_handler != NULL)
&& (m_adv_mode_current == BLE_ADV_MODE_FAST || m_adv_mode_current == BLE_ADV_MODE_SLOW)
&& (m_adv_modes_config.ble_adv_whitelist_enabled)
&& (!m_whitelist_temporarily_disabled))
{
m_whitelist_reply_expected = true;
m_evt_handler(BLE_ADV_EVT_WHITELIST_REQUEST);
}
else
{
m_whitelist_reply_expected = false;
}

// Initialize advertising parameters with default values.
memset(&adv_params, 0, sizeof(adv_params));

adv_params.type        = BLE_GAP_ADV_TYPE_ADV_IND;
adv_params.p_peer_addr = NULL;
adv_params.fp          = BLE_GAP_ADV_FP_ANY;
adv_params.p_whitelist = NULL;

// Set advertising parameters and events according to selected advertising mode.
switch (m_adv_mode_current)
{
case BLE_ADV_MODE_DIRECTED:
LOG("[ADV]: Starting direct advertisement.\r\n");
adv_params.p_peer_addr = &m_peer_address; // Directed advertising.
adv_params.type        = BLE_GAP_ADV_TYPE_ADV_DIRECT_IND;
adv_params.timeout     = 0;
adv_params.interval    = 0;
m_adv_evt              = BLE_ADV_EVT_DIRECTED;
break;

case BLE_ADV_MODE_DIRECTED_SLOW:
LOG("[ADV]: Starting direct advertisement.\r\n");
adv_params.p_peer_addr = &m_peer_address; // Directed advertising.
adv_params.type        = BLE_GAP_ADV_TYPE_ADV_DIRECT_IND;
adv_params.timeout     = m_adv_modes_config.ble_adv_directed_slow_timeout;
adv_params.interval    = m_adv_modes_config.ble_adv_directed_slow_interval;
m_adv_evt              = BLE_ADV_EVT_DIRECTED_SLOW;
break;

case BLE_ADV_MODE_FAST:
adv_params.timeout  = m_adv_modes_config.ble_adv_fast_timeout;
adv_params.interval = m_adv_modes_config.ble_adv_fast_interval;

if (   whitelist_has_entries(&m_whitelist)
&& m_adv_modes_config.ble_adv_whitelist_enabled
&& !m_whitelist_temporarily_disabled)
{
adv_params.fp          = BLE_GAP_ADV_FP_FILTER_CONNREQ;
adv_params.p_whitelist = &m_whitelist;
m_advdata.flags        = BLE_GAP_ADV_FLAG_BR_EDR_NOT_SUPPORTED;
err_code               = ble_advdata_set(&m_advdata, NULL);
if(err_code != NRF_SUCCESS)
{
return err_code;
}

m_adv_evt = BLE_ADV_EVT_FAST_WHITELIST;
LOG("[ADV]: Starting fast advertisement with whitelist.\r\n");
}
else
{
m_adv_evt = BLE_ADV_EVT_FAST;
LOG("[ADV]: Starting fast advertisement.\r\n");
}
break;

case BLE_ADV_MODE_SLOW:
adv_params.interval = m_adv_modes_config.ble_adv_slow_interval;
adv_params.timeout  = m_adv_modes_config.ble_adv_slow_timeout;

if (   whitelist_has_entries(&m_whitelist)
&& m_adv_modes_config.ble_adv_whitelist_enabled
&& !m_whitelist_temporarily_disabled)
{
adv_params.fp          = BLE_GAP_ADV_FP_FILTER_CONNREQ;
adv_params.p_whitelist = &m_whitelist;
m_advdata.flags        = BLE_GAP_ADV_FLAG_BR_EDR_NOT_SUPPORTED;
err_code               = ble_advdata_set(&m_advdata, NULL);
if(err_code != NRF_SUCCESS)
{
return err_code;
}

m_adv_evt = BLE_ADV_EVT_SLOW_WHITELIST;
LOG("[ADV]: Starting slow advertisement with whitelist.\r\n");
}
else
{
m_adv_evt = BLE_ADV_EVT_SLOW;
LOG("[ADV]: Starting slow advertisement.\r\n");
}
break;

default:
break;
}
if (m_adv_mode_current != BLE_ADV_MODE_IDLE)
{
err_code = sd_ble_gap_adv_start(&adv_params);
if(err_code != NRF_SUCCESS)
{
return err_code;
}
}
if (m_evt_handler != NULL)
{
m_evt_handler(m_adv_evt);
}

return NRF_SUCCESS;
}

上面代带可以看到ble_advertising_start();可以设置广播的模式。

BLE_ADV_MODE_DIRECTED和BLE_ADV_MODE_DIRECTED_SLOW的时候，需要设置

adv_params.p_peer_addr = &m_peer_address; // Directed advertising.这个参数

参数的定义如下：

/**@brief Bluetooth Low Energy address. */

typedef struct

{

uint8_t addr_type; /**< See @ref BLE_GAP_ADDR_TYPES. */

uint8_t addr[BLE_GAP_ADDR_LEN]; /**< 48-bit address, LSB format. */

} ble_gap_addr_t;

static ble_gap_addr_t m_peer_address; /**< Address of the most recently connected peer, used for direct advertising. */

可以看到这个是设置地址的类型和6位的地址码。

这里设置能连上自己的设备的蓝牙地址，就可以定向广播了。蓝牙值选择设置mac地址的设备才能连上自己。