《nrf52832 sdk15.2.0蓝牙主模式工作过程分析(uart官网实例)》

nrf52832 sdk15.2.0蓝牙主模式工作过程分析(uart官网实例)

如何在从模式的工程增加一个蓝牙主模式服务，方便快速了解工程的整合，本例是在ble外设的uart蓝牙实例上添加来

介绍的

在nRF_BLE目录中添加nrf_ble_scan.c和ble_db_discovery.c两个文件，在nRF_BLE_Services目录下添加

ble_nus_c.c文件

在C/C++选项的Include Paths中,添加以下路径

​

在main.c中加入头文件
#include "ble_db_discovery.h"
#include "ble_nus_c.h"
#include "nrf_ble_scan.h"
#include "ble_advdata.h"

定义以下几个变量

BLE_NUS_C_DEF(m_ble_nus_c); /**< BLE Nordic UART Service (NUS) client instance. */
BLE_DB_DISCOVERY_DEF(m_db_disc); /**< Database discovery module instance. */
NRF_BLE_SCAN_DEF(m_scan); /**< Scanning Module instance. */
/**@brief NUS UUID. */
static ble_uuid_t const m_nus_uuid =
{
.uuid = BLE_UUID_NUS_SERVICE,
.type = NUS_SERVICE_UUID_TYPE
};

static uint16_t m_center_handle = BLE_CONN_HANDLE_INVALID;

在sdk_config.h中加入宏,注意红色字体的内容

// <h> 主扫描设置// <q> BLE_DB_DISCOVERY_ENABLED - ble_db_discovery - Database discovery module #ifndef BLE_DB_DISCOVERY_ENABLED#define BLE_DB_DISCOVERY_ENABLED 1#endif// <e> NRF_BLE_SCAN_ENABLED - nrf_ble_scan - Scanning Module//==========================================================#ifndef NRF_BLE_SCAN_ENABLED#define NRF_BLE_SCAN_ENABLED 1#endif// <o> NRF_BLE_SCAN_BUFFER - Data length for an advertising set. #ifndef NRF_BLE_SCAN_BUFFER#define NRF_BLE_SCAN_BUFFER 31#endif// <o> NRF_BLE_SCAN_NAME_MAX_LEN - Maximum size for the name to search in the advertisement report. #ifndef NRF_BLE_SCAN_NAME_MAX_LEN#define NRF_BLE_SCAN_NAME_MAX_LEN 32#endif// <o> NRF_BLE_SCAN_SHORT_NAME_MAX_LEN - Maximum size of the short name to search for in the advertisement report. #ifndef NRF_BLE_SCAN_SHORT_NAME_MAX_LEN#define NRF_BLE_SCAN_SHORT_NAME_MAX_LEN 32#endif// <o> NRF_BLE_SCAN_SCAN_INTERVAL - Scanning interval. Determines the scan interval in units of 0.625 millisecond. #ifndef NRF_BLE_SCAN_SCAN_INTERVAL#define NRF_BLE_SCAN_SCAN_INTERVAL 160#endif// <o> NRF_BLE_SCAN_SCAN_DURATION - Duration of a scanning session in units of 10 ms. Range: 0x0001 - 0xFFFF (10 ms to 10.9225 ms). If set to 0x0000, the scanning continues until it is explicitly disabled. #ifndef NRF_BLE_SCAN_SCAN_DURATION#define NRF_BLE_SCAN_SCAN_DURATION 0#endif// <o> NRF_BLE_SCAN_SCAN_WINDOW - Scanning window. Determines the scanning window in units of 0.625 millisecond. #ifndef NRF_BLE_SCAN_SCAN_WINDOW#define NRF_BLE_SCAN_SCAN_WINDOW 80#endif// <o> NRF_BLE_SCAN_MIN_CONNECTION_INTERVAL - Determines minimum connection interval in milliseconds. #ifndef NRF_BLE_SCAN_MIN_CONNECTION_INTERVAL#define NRF_BLE_SCAN_MIN_CONNECTION_INTERVAL 7.5#endif// <o> NRF_BLE_SCAN_MAX_CONNECTION_INTERVAL - Determines maximum connection interval in milliseconds. #ifndef NRF_BLE_SCAN_MAX_CONNECTION_INTERVAL#define NRF_BLE_SCAN_MAX_CONNECTION_INTERVAL 30#endif// <o> NRF_BLE_SCAN_SLAVE_LATENCY - Determines the slave latency in counts of connection events. #ifndef NRF_BLE_SCAN_SLAVE_LATENCY#define NRF_BLE_SCAN_SLAVE_LATENCY 0#endif// <o> NRF_BLE_SCAN_SUPERVISION_TIMEOUT - Determines the supervision time-out in units of 10 millisecond. #ifndef NRF_BLE_SCAN_SUPERVISION_TIMEOUT#define NRF_BLE_SCAN_SUPERVISION_TIMEOUT 4000#endif// <o> NRF_BLE_SCAN_SCAN_PHY - PHY to scan on. // <0=> BLE_GAP_PHY_AUTO // <1=> BLE_GAP_PHY_1MBPS // <2=> BLE_GAP_PHY_2MBPS // <4=> BLE_GAP_PHY_CODED // <255=> BLE_GAP_PHY_NOT_SET #ifndef NRF_BLE_SCAN_SCAN_PHY#define NRF_BLE_SCAN_SCAN_PHY 1#endif// <e> NRF_BLE_SCAN_FILTER_ENABLE - Enabling filters for the Scanning Module.//==========================================================#ifndef NRF_BLE_SCAN_FILTER_ENABLE#define NRF_BLE_SCAN_FILTER_ENABLE 1#endif// <o> NRF_BLE_SCAN_UUID_CNT - Number of filters for UUIDs. #ifndef NRF_BLE_SCAN_UUID_CNT#define NRF_BLE_SCAN_UUID_CNT 1#endif// <o> NRF_BLE_SCAN_NAME_CNT - Number of name filters. #ifndef NRF_BLE_SCAN_NAME_CNT#define NRF_BLE_SCAN_NAME_CNT 0#endif// <o> NRF_BLE_SCAN_SHORT_NAME_CNT - Number of short name filters. #ifndef NRF_BLE_SCAN_SHORT_NAME_CNT#define NRF_BLE_SCAN_SHORT_NAME_CNT 0#endif// <o> NRF_BLE_SCAN_ADDRESS_CNT - Number of address filters. #ifndef NRF_BLE_SCAN_ADDRESS_CNT#define NRF_BLE_SCAN_ADDRESS_CNT 0#endif// <o> NRF_BLE_SCAN_APPEARANCE_CNT - Number of appearance filters. #ifndef NRF_BLE_SCAN_APPEARANCE_CNT#define NRF_BLE_SCAN_APPEARANCE_CNT 0#endif// </e>// </e>// </h>

// <q> BLE_NUS_C_ENABLED - ble_nus_c - Nordic UART Central Service

#ifndef BLE_NUS_C_ENABLED
#define BLE_NUS_C_ENABLED 1
#endif

// <i> Requested BLE GAP data length to be negotiated.

#ifndef NRF_SDH_BLE_GAP_DATA_LENGTH
#define NRF_SDH_BLE_GAP_DATA_LENGTH 251
#endif

// <o> NRF_SDH_BLE_PERIPHERAL_LINK_COUNT - Maximum number of peripheral links.
#ifndef NRF_SDH_BLE_PERIPHERAL_LINK_COUNT
#define NRF_SDH_BLE_PERIPHERAL_LINK_COUNT 1
#endif

// <o> NRF_SDH_BLE_CENTRAL_LINK_COUNT - Maximum number of central links.
#ifndef NRF_SDH_BLE_CENTRAL_LINK_COUNT
#define NRF_SDH_BLE_CENTRAL_LINK_COUNT 1
#endif

// <o> NRF_SDH_BLE_TOTAL_LINK_COUNT - Total link count.
// <i> Maximum number of total concurrent connections using the default configuration.

#ifndef NRF_SDH_BLE_TOTAL_LINK_COUNT
#define NRF_SDH_BLE_TOTAL_LINK_COUNT 2
#endif

// <o> NRF_SDH_BLE_GAP_EVENT_LENGTH - GAP event length.
// <i> The time set aside for this connection on every connection interval in 1.25 ms units.

#ifndef NRF_SDH_BLE_GAP_EVENT_LENGTH
#define NRF_SDH_BLE_GAP_EVENT_LENGTH 6
#endif

// <o> NRF_SDH_BLE_GATT_MAX_MTU_SIZE - Static maximum MTU size.
#ifndef NRF_SDH_BLE_GATT_MAX_MTU_SIZE
#define NRF_SDH_BLE_GATT_MAX_MTU_SIZE 247
#endif

// <o> NRF_SDH_BLE_GATTS_ATTR_TAB_SIZE - Attribute Table size in bytes. The size must be a multiple of 4.
#ifndef NRF_SDH_BLE_GATTS_ATTR_TAB_SIZE
#define NRF_SDH_BLE_GATTS_ATTR_TAB_SIZE 1408
#endif

// <o> NRF_SDH_BLE_VS_UUID_COUNT - The number of vendor-specific UUIDs.
#ifndef NRF_SDH_BLE_VS_UUID_COUNT
#define NRF_SDH_BLE_VS_UUID_COUNT 1
#endif

// <q> NRF_SDH_BLE_SERVICE_CHANGED - Include the Service Changed characteristic in the Attribute Table.

#ifndef NRF_SDH_BLE_SERVICE_CHANGED
#define NRF_SDH_BLE_SERVICE_CHANGED 0
#endif

// <i> Enable/disable central-specific Peer Manager functionality.

#ifndef PM_CENTRAL_ENABLED
#define PM_CENTRAL_ENABLED 1
#endif
// </e>

//</e>

在main.c中ble_evt_handler函数中加入代码，见红色字体
/**@brief Function for handling BLE events.
*
* @param[in] p_ble_evt Bluetooth stack event.
* @param[in] p_context Unused.
*/
static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)
{
uint32_t err_code;
uint16_t conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
uint16_t role = ble_conn_state_role(conn_handle);
switch (p_ble_evt->header.evt_id)
{
case BLE_GAP_EVT_CONNECTED:

// Based on the role this device plays in the connection, dispatch to the right handler.
if (role == BLE_GAP_ROLE_PERIPH)
{
NRF_LOG_INFO("Connected");

m_conn_handle = conn_handle;
err_code = nrf_ble_qwr_conn_handle_assign(&m_qwr, m_conn_handle);
APP_ERROR_CHECK(err_code);
}
else if (role == BLE_GAP_ROLE_CENTRAL)
{
m_center_handle = conn_handle;
err_code = ble_nus_c_handles_assign(&m_ble_nus_c, m_center_handle, NULL);
APP_ERROR_CHECK(err_code);

// start discovery of services. The NUS Client waits for a discovery result
err_code = ble_db_discovery_start(&m_db_disc, m_center_handle);
APP_ERROR_CHECK(err_code);

}

break;

case BLE_GAP_EVT_DISCONNECTED:
NRF_LOG_INFO("Disconnected");
// LED indication will be changed when advertising starts.
if (role == BLE_GAP_ROLE_PERIPH)
{
m_conn_handle = BLE_CONN_HANDLE_INVALID;
}
else if (role == BLE_GAP_ROLE_CENTRAL)
{
m_center_handle = BLE_CONN_HANDLE_INVALID;
}
break;

case BLE_GAP_EVT_PHY_UPDATE_REQUEST:
{
NRF_LOG_DEBUG("PHY update request.");
ble_gap_phys_t const phys =
{
.rx_phys = BLE_GAP_PHY_AUTO,
.tx_phys = BLE_GAP_PHY_AUTO,
};
err_code = sd_ble_gap_phy_update(p_ble_evt->evt.gap_evt.conn_handle, &phys);
APP_ERROR_CHECK(err_code);
} break;

case BLE_GAP_EVT_SEC_PARAMS_REQUEST:
// Pairing not supported
err_code = sd_ble_gap_sec_params_reply(m_conn_handle, BLE_GAP_SEC_STATUS_PAIRING_NOT_SUPP, NULL, NULL);
APP_ERROR_CHECK(err_code);
break;

case BLE_GATTS_EVT_SYS_ATTR_MISSING:
// No system attributes have been stored.
err_code = sd_ble_gatts_sys_attr_set(m_conn_handle, NULL, 0, 0);
APP_ERROR_CHECK(err_code);
break;

case BLE_GATTC_EVT_TIMEOUT:
// Disconnect on GATT Client timeout event.
err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gattc_evt.conn_handle,
BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
APP_ERROR_CHECK(err_code);
break;

case BLE_GATTS_EVT_TIMEOUT:
// Disconnect on GATT Server timeout event.
err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gatts_evt.conn_handle,
BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
APP_ERROR_CHECK(err_code);
break;

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

在main.c中加入扫描数据报告代码
typedef struct
{
uint8_t addr[6];
uint8_t data[32];
uint8_t len;
int8_t rssi;
}SCAN_DATA_INFO;

SCAN_DATA_INFO scanInfo[16];
uint8_t scanTotal;

void clearScanInfo(void)
{
for(uint8_t i=0;i<scanTotal;i++)
{
memset(&scanTotal,0,sizeof(SCAN_DATA_INFO));
}
scanTotal = 0;
}
uint8_t searchMac(scan_evt_t const * p_scan_evt)
{
uint8_t flag = 0;
for(uint8_t i=0; i<16;i++)
{
flag = 0;
for(uint8_t j=0;j<6;j++)
{
if(scanInfo[i].addr[j] == p_scan_evt->params.p_not_found->peer_addr.addr[j])
{

if(++flag>=6)
{

return 0;
}
}
}
}
return 1;
}

/**@brief Function for handling Scanning Module events.
*/
static void scan_evt_handler(scan_evt_t const * p_scan_evt)
{
ret_code_t err_code;
uint16_t data_offset = 0;
uint8_t i;
switch(p_scan_evt->scan_evt_id)
{
case NRF_BLE_SCAN_EVT_CONNECTING_ERROR:
{
err_code = p_scan_evt->params.connecting_err.err_code;
APP_ERROR_CHECK(err_code);
} break;

case NRF_BLE_SCAN_EVT_NOT_FOUND:

if(scanTotal < 16)
{
if(searchMac(p_scan_evt))
{
scanInfo[scanTotal].len = ble_advdata_search(p_scan_evt->params.p_not_found->data.p_data,
p_scan_evt->params.p_not_found->data.len,
&data_offset,
BLE_GAP_AD_TYPE_COMPLETE_LOCAL_NAME);
if(scanInfo[scanTotal].len == 0)
break;

strncpy((char*)scanInfo[scanTotal].data,(const char*)&p_scan_evt->params.p_not_found

->data.p_data[data_offset],scanInfo[scanTotal].len);

scanInfo[scanTotal].rssi = p_scan_evt->params.p_not_found->rssi;
for(i=0;i<6;i++)
{
scanInfo[scanTotal].addr[i] = p_scan_evt->params.p_not_found->peer_addr.addr[i];

}

for(uint8_t j=0;j<scanInfo[scanTotal].len;j++)

printf("%c", scanInfo[scanTotal].data[j]);

printf("\n");
scanTotal++;
}

}

break;
case NRF_BLE_SCAN_EVT_CONNECTED:
{
ble_gap_evt_connected_t const * p_connected =
p_scan_evt->params.connected.p_connected;
// Scan is automatically stopped by the connection.
NRF_LOG_INFO("Connecting to target %02x%02x%02x%02x%02x%02x",
p_connected->peer_addr.addr[0],
p_connected->peer_addr.addr[1],
p_connected->peer_addr.addr[2],
p_connected->peer_addr.addr[3],
p_connected->peer_addr.addr[4],
p_connected->peer_addr.addr[5]
);
clearScanInfo();
} break;

case NRF_BLE_SCAN_EVT_SCAN_TIMEOUT:
{
NRF_LOG_INFO("Scan timed out.");

scan_start();
} break;

default:
break;
}
}

在main.c中定义定时器变量及定时事件函数

#define TICK_1HZ_INTERVAL APP_TIMER_TICKS(1000)
APP_TIMER_DEF(m_1hz_id);
static volatile uint8_t tickFlag;

/**@brief Function for handling the Battery measurement timer timeout.
*
* @details This function will be called each time the battery level measurement timer expires.
*
* @param[in] p_context Pointer used for passing some arbitrary information (context) from the
* app_start_timer() call to the timeout handler.
*/
static void tick_1hz_timeout_handler(void * p_context)
{
UNUSED_PARAMETER(p_context);
tickFlag = 1;
}

/**@brief Function for starting application timers.
*/
static void application_timers_start(void)
{
ret_code_t err_code;

// Start application timers.
err_code = app_timer_start(m_1hz_id, TICK_1HZ_INTERVAL, NULL);
APP_ERROR_CHECK(err_code);

}

/**@brief Function for initializing the timer module.
*/
static void timers_init(void)
{
ret_code_t err_code = app_timer_init();
APP_ERROR_CHECK(err_code);

err_code = app_timer_create(&m_1hz_id,
APP_TIMER_MODE_REPEATED,
tick_1hz_timeout_handler);
APP_ERROR_CHECK(err_code);
}

在main.c中的ble_nus_chars_received_uart_print函数打印数据

/**@brief Function for handling characters received by the Nordic UART Service (NUS).
*
* @details This function takes a list of characters of length data_len and prints the characters out on UART.
* If @ref ECHOBACK_BLE_UART_DATA is set, the data is sent back to sender.
*/
static void ble_nus_chars_received_uart_print(uint8_t * p_data, uint16_t data_len)
{
for (uint32_t i = 0; i < data_len; i++)
{
printf("%02x ",p_data[i]);
}
printf("\n");

}

在main函数中初时化及定时发送数据

static uint32_t tick;
static uint8_t sendBuf[4];
static uint16_t len = 4;
/**@brief Application main function.
*/
int main(void)
{

// Initialize.
uart_init();
log_init();
timers_init();

power_management_init();

ble_stack_init();
db_discovery_init();
scan_init();
gap_params_init();
gatt_init();
conn_params_init();

nus_c_init();
services_init();
advertising_init();

// Start execution.
printf("\r\nUART started.\r\n");
scan_start();
advertising_start();
application_timers_start();
// Enter main loop.
for (;;)
{
if(tickFlag)
{
tickFlag = 0;
if(m_center_handle != BLE_CONN_HANDLE_INVALID)
{
tick++;
sendBuf[0] = (tick>>24) & 0xff;
sendBuf[1] = (tick>>16) & 0xff;
sendBuf[2] = (tick>>8) & 0xff;
sendBuf[3] = tick & 0xff;
ble_nus_c_string_send(&m_ble_nus_c,sendBuf,len);

}

}
else
{
idle_state_handle();
}
}
}

RAM地址设置

Demo下载地址：https://download.csdn.net/download/mygod2008ok/11162759

​

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