相关下载:http://download.csdn.net/detail/xgbing/9565708
首先看的示例是心率计一个示例程序:<KEIL path> \ARM\Device\Nordic\nrf51822\Board\pca10001\s110\ble_app_hrs\arm。
打开工程前需要下载蓝牙协议栈S110 nRF51822 SoftDevice(s110_nrf51822_6.0.0_softdevice.hex)到板子中,这个手册上有说明。
首先看的是main.c中的main函数:
/***************************************************************************** * Main Function *****************************************************************************/ /**@brief Function for the application main entry. */ int main(void) { uint32_t err_code; timers_init(); gpiote_init(); buttons_init(); ble_stack_init(); bond_manager_init(); // Initialize Bluetooth Stack parameters gap_params_init(); advertising_init(); services_init(); conn_params_init(); sec_params_init(); // Start advertising advertising_start(); // Enter main loop for (;;) { // Switch to a low power state until an event is available for the application err_code = sd_app_evt_wait(); APP_ERROR_CHECK(err_code); } }
它很简洁:初始化->start->loop。
(1)Timer初始化
/**@brief Function for the Timer initialization. * * @details Initializes the timer module. This creates and starts application timers. */ static void timers_init(void) { uint32_t err_code; // Initialize timer module APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_MAX_TIMERS, APP_TIMER_OP_QUEUE_SIZE, false); // Create timers err_code = app_timer_create(&m_battery_timer_id, APP_TIMER_MODE_REPEATED, battery_level_meas_timeout_handler); APP_ERROR_CHECK(err_code); err_code = app_timer_create(&m_heart_rate_timer_id, APP_TIMER_MODE_REPEATED, heart_rate_meas_timeout_handler); APP_ERROR_CHECK(err_code); }
使用app_timer_create创建了两个时钟,处理函数分别是battery_level_meas_timeout_handler和heart_rate_meas_timeout_handler。
/**@brief Function for handling the Battery measurement timer timeout. * * @details This function will be called each time the battery level measurement timer expires. * This function will start the ADC. * * @param[in] p_context Pointer used for passing some arbitrary information (context) from the * app_start_timer() call to the timeout handler. */ static void battery_level_meas_timeout_handler(void * p_context) { UNUSED_PARAMETER(p_context); battery_start(); } /**@brief Function for handling the Heart rate measurement timer timeout. * * @details This function will be called each time the heart rate measurement timer expires. * It will exclude RR Interval data from every third measurement. * * @param[in] p_context Pointer used for passing some arbitrary information (context) from the * app_start_timer() call to the timeout handler. */ static void heart_rate_meas_timeout_handler(void * p_context) { uint32_t err_code; UNUSED_PARAMETER(p_context); err_code = ble_hrs_heart_rate_measurement_send(&m_hrs, m_cur_heart_rate); if ( (err_code != NRF_SUCCESS) && (err_code != NRF_ERROR_INVALID_STATE) && (err_code != BLE_ERROR_NO_TX_BUFFERS) && (err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING) ) { APP_ERROR_HANDLER(err_code); } }
时钟创建后并不会自动运行,当调用application_timers_start后时钟开始运行:
/**@brief Function for starting the application timers. */ static void application_timers_start(void) { uint32_t err_code; // Start application timers err_code = app_timer_start(m_battery_timer_id, BATTERY_LEVEL_MEAS_INTERVAL, NULL); APP_ERROR_CHECK(err_code); err_code = app_timer_start(m_heart_rate_timer_id, HEART_RATE_MEAS_INTERVAL, NULL); APP_ERROR_CHECK(err_code); }
services_init()初始化程序中的三个服务:ble_dis.c, ble_bas.c, ble_hrs.c。
/**@brief Function for initializing the services that will be used by the application. * * @details Initialize the Heart Rate, Battery and Device Information services. */ static void services_init(void) { uint32_t err_code; ble_hrs_init_t hrs_init; ble_bas_init_t bas_init; ble_dis_init_t dis_init; uint8_t body_sensor_location; // Initialize Heart Rate Service body_sensor_location = BLE_HRS_BODY_SENSOR_LOCATION_FINGER; memset(&hrs_init, , sizeof(hrs_init)); hrs_init.is_sensor_contact_supported = false; hrs_init.p_body_sensor_location = &body_sensor_location; // Here the sec level for the Heart Rate Service can be changed/increased. BLE_GAP_CONN_SEC_MODE_SET_OPEN(&hrs_init.hrs_hrm_attr_md.cccd_write_perm); BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&hrs_init.hrs_hrm_attr_md.read_perm); BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&hrs_init.hrs_hrm_attr_md.write_perm); BLE_GAP_CONN_SEC_MODE_SET_OPEN(&hrs_init.hrs_bsl_attr_md.read_perm); BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&hrs_init.hrs_bsl_attr_md.write_perm); err_code = ble_hrs_init(&m_hrs, &hrs_init); APP_ERROR_CHECK(err_code); // Initialize Battery Service memset(&bas_init, , sizeof(bas_init)); // Here the sec level for the Battery Service can be changed/increased. BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init.battery_level_char_attr_md.cccd_write_perm); BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init.battery_level_char_attr_md.read_perm); BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&bas_init.battery_level_char_attr_md.write_perm); BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init.battery_level_report_read_perm); bas_init.evt_handler = NULL; bas_init.support_notification = true; bas_init.p_report_ref = NULL; bas_init.initial_batt_level = ; err_code = ble_bas_init(&bas, &bas_init); APP_ERROR_CHECK(err_code); // Initialize Device Information Service memset(&dis_init, , sizeof(dis_init)); ble_srv_ascii_to_utf8(&dis_init.manufact_name_str, MANUFACTURER_NAME); BLE_GAP_CONN_SEC_MODE_SET_OPEN(&dis_init.dis_attr_md.read_perm); BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&dis_init.dis_attr_md.write_perm); err_code = ble_dis_init(&dis_init); APP_ERROR_CHECK(err_code); }
static ble_hrs_t的结构定义:
/**@brief Heart Rate Service structure. This contains various status information for the service. */ typedef struct ble_hrs_s { ble_hrs_evt_handler_t evt_handler; /**< Event handler to be called for handling events in the Heart Rate Service. */ bool is_expended_energy_supported; /**< TRUE if Expended Energy measurement is supported. */ bool is_sensor_contact_supported; /**< TRUE if sensor contact detection is supported. */ uint16_t service_handle; /**< Handle of Heart Rate Service (as provided by the BLE stack). */ ble_gatts_char_handles_t hrm_handles; /**< Handles related to the Heart Rate Measurement characteristic. */ ble_gatts_char_handles_t bsl_handles; /**< Handles related to the Body Sensor Location characteristic. */ ble_gatts_char_handles_t hrcp_handles; /**< Handles related to the Heart Rate Control Point characteristic. */ uint16_t conn_handle; /**< Handle of the current connection (as provided by the BLE stack, is BLE_CONN_HANDLE_INVALID if not in a connection). */ bool is_sensor_contact_detected; /**< TRUE if sensor contact has been detected. */ uint16_t rr_interval[BLE_HRS_MAX_BUFFERED_RR_INTERVALS]; /**< Set of RR Interval measurements since the last Heart Rate Measurement transmission. */ uint16_t rr_interval_count; /**< Number of RR Interval measurements since the last Heart Rate Measurement transmission. */ } ble_hrs_t;
ble_hrs.h/ble_hrs.c是心率计程序服务的代码。
buttons_init(void)初始化两个按钮:HR_INC_BUTTON_PIN_NO和HR_DEC_BUTTON_PIN_NO,分别模拟心率计的加减。
/**@brief Function for initializing the button module. */ static void buttons_init(void) { // Configure HR_INC_BUTTON_PIN_NO and HR_DEC_BUTTON_PIN_NO as wake up buttons and also configure // for 'pull up' because the eval board does not have external pull up resistors connected to // the buttons. static app_button_cfg_t buttons[] = { {HR_INC_BUTTON_PIN_NO, false, BUTTON_PULL, button_event_handler}, {HR_DEC_BUTTON_PIN_NO, false, BUTTON_PULL, button_event_handler} // Note: This pin is also BONDMNGR_DELETE_BUTTON_PIN_NO }; APP_BUTTON_INIT(buttons, ]), BUTTON_DETECTION_DELAY, false); }
当按下按钮时,处理程序是button_event_handler(),它处理心率计的加减模拟:
/**@brief Function for handling button events. * * @param[in] pin_no The pin number of the button pressed. */ static void button_event_handler(uint8_t pin_no, uint8_t button_action) { if (button_action == APP_BUTTON_PUSH) { switch (pin_no) { case HR_INC_BUTTON_PIN_NO: // Increase Heart Rate measurement m_cur_heart_rate += HEART_RATE_CHANGE; if (m_cur_heart_rate > MAX_HEART_RATE) { m_cur_heart_rate = MIN_HEART_RATE; // Loop back } break; case HR_DEC_BUTTON_PIN_NO: // Decrease Heart Rate measurement m_cur_heart_rate -= HEART_RATE_CHANGE; if (m_cur_heart_rate < MIN_HEART_RATE) { m_cur_heart_rate = MAX_HEART_RATE; // Loop back } break; default: APP_ERROR_HANDLER(pin_no); break; } } }