#include "app_config.h" #include "nrf_sdh.h" #include "nrf_sdh_ble.h" #include "nrf_drv_clock.h" #include "nrf_sdh_freertos.h" #include "FreeRTOS.h" #include "task.h" #include "ble_advdata.h" #include "nrf_ble_gatt.h" #include "app_timer.h" #include "bsp.h" #include "nrf_log.h" #include "nrf_log_ctrl.h" #include "nrf_log_default_backends.h" #define TASK_DELAY 200 /**< Task delay. Delays the LED task for 200 ms */ #define SCAN_INTERVAL 0x00A0 /**< Determines scan interval in units of 0.625 millisecond. */ #define SCAN_WINDOW 0x0050 /**< Determines scan window in units of 0.625 millisecond. */ #define SCAN_DURATION 0x0000 /**< Timout when scanning. 0x0000 disables timeout. */ #define MIN_CONNECTION_INTERVAL MSEC_TO_UNITS(7.5, UNIT_1_25_MS) /**< Determines minimum connection interval in milliseconds. */ #define MAX_CONNECTION_INTERVAL MSEC_TO_UNITS(15, UNIT_1_25_MS) /**< Determines maximum connection interval in milliseconds. */ #define SLAVE_LATENCY 0 /**< Determines slave latency in terms of connection events. */ #define SUPERVISION_TIMEOUT MSEC_TO_UNITS(4000, UNIT_10_MS) /**< Determines supervision time-out in units of 10 milliseconds. */ #define APP_BLE_CONN_CFG_TAG 1 /**< A tag identifying the SoftDevice BLE configuration. */ #define APP_BLE_OBSERVER_PRIO 3 /**< Application's BLE observer priority. You shouldn't need to modify this value. */ NRF_BLE_GATT_DEF(m_gatt); /**< GATT module instance. */ static TaskHandle_t m_led_thread; /**< Definition of LED bliking thread. */ /**@brief Parameters used when scanning. */ static ble_gap_scan_params_t const m_scan_params = { .active = 1, .interval = SCAN_INTERVAL, .window = SCAN_WINDOW, .timeout = SCAN_DURATION, .scan_phys = BLE_GAP_PHY_1MBPS, .filter_policy = BLE_GAP_SCAN_FP_ACCEPT_ALL, }; /**@brief Connection parameters requested for connection. */ static ble_gap_conn_params_t const m_connection_param = { (uint16_t)MIN_CONNECTION_INTERVAL, (uint16_t)MAX_CONNECTION_INTERVAL, (uint16_t)SLAVE_LATENCY, (uint16_t)SUPERVISION_TIMEOUT }; static char const m_target_periph_name[] = DEVICE_NAME_PERIPHERAL; /**< Name of the device we try to connect to. This name is searched in the scan report data*/ #define INVALID_CONN_HANDLE 0xFFFF uint16_t m_conn_handle = INVALID_CONN_HANDLE; ble_gap_addr_t m_peer_addr; static uint8_t m_scan_buffer_data[BLE_GAP_SCAN_BUFFER_MIN]; /**< buffer where advertising reports will be stored by the SoftDevice. */ /**@brief Pointer to the buffer where advertising reports will be stored by the SoftDevice. */ static ble_data_t m_scan_buffer = { m_scan_buffer_data, BLE_GAP_SCAN_BUFFER_MIN }; /**@brief Function to start scanning ble devices. */ static void app_ble_scan_start(void *p_context) { UNUSED_PARAMETER(p_context); ret_code_t err_code; (void) sd_ble_gap_scan_stop(); err_code = sd_ble_gap_scan_start(&m_scan_params, &m_scan_buffer); APP_ERROR_CHECK(err_code); // Signal scanning. NRF_LOG_INFO("Started scanning."); } /**@brief Function for handling the advertising report BLE event. * * @param[in] p_adv_report Advertising report from the SoftDevice. */ static void on_adv_report(ble_gap_evt_adv_report_t const * p_adv_report) { ret_code_t err_code; if (ble_advdata_name_find(p_adv_report->data.p_data, p_adv_report->data.len, m_target_periph_name)) { // copy address of found device memcpy(&m_peer_addr, &p_adv_report->peer_addr, sizeof(ble_gap_addr_t)); NRF_LOG_DEBUG("Compatible device found, connecting."); err_code = sd_ble_gap_scan_start(NULL, &m_scan_buffer); // Name is a match, initiate connection. err_code = sd_ble_gap_connect(&m_peer_addr, &m_scan_params, &m_connection_param, APP_BLE_CONN_CFG_TAG); APP_ERROR_CHECK(err_code); } else { //NRF_LOG_DEBUG("Compatible device not found, continue scanning."); err_code = sd_ble_gap_scan_start(NULL, &m_scan_buffer); APP_ERROR_CHECK(err_code); } } /**@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) { ret_code_t err_code; // For readability. ble_gap_evt_t const * p_gap_evt = &p_ble_evt->evt.gap_evt; switch (p_ble_evt->header.evt_id) { // Update connection handle. case BLE_GAP_EVT_CONNECTED: { m_conn_handle = p_gap_evt->conn_handle; NRF_LOG_INFO("BLE peripheral connected."); bsp_board_led_on(BSP_BOARD_LED_1); } break; // Upon disconnection, reset the connection handle of the peer which disconnected case BLE_GAP_EVT_DISCONNECTED: { m_conn_handle = INVALID_CONN_HANDLE; NRF_LOG_INFO("BLE peripheral disconnected."); bsp_board_led_off(BSP_BOARD_LED_1); // start scanning again app_ble_scan_start(NULL); } break; // Call advertising report handler and connect if applicable case BLE_GAP_EVT_ADV_REPORT: { on_adv_report(&p_gap_evt->params.adv_report); } break; // We have not specified a timeout for scanning, so only connection attemps can timeout. case BLE_GAP_EVT_TIMEOUT: { NRF_LOG_DEBUG("GAP Connection Timeout."); if (p_gap_evt->params.timeout.src == BLE_GAP_TIMEOUT_SRC_CONN) { NRF_LOG_DEBUG("Connection request timed out."); } } break; // Accept parameters requested by peer. case BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST: { NRF_LOG_DEBUG("Connection Parameter Update Request."); err_code = sd_ble_gap_conn_param_update(p_gap_evt->conn_handle, &p_gap_evt->params.conn_param_update_request.conn_params); APP_ERROR_CHECK(err_code); } 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; // Disconnect on GATT Client timeout event. case BLE_GATTC_EVT_TIMEOUT: { NRF_LOG_DEBUG("GATT Client Timeout."); 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; // Disconnect on GATT Server timeout event. case BLE_GATTS_EVT_TIMEOUT: { NRF_LOG_DEBUG("GATT Server Timeout."); 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; // No implementation needed. default: { NRF_LOG_DEBUG("ble_evt_handler evt id %i", p_ble_evt->header.evt_id); } break; } } /**@brief Function for initializing the BLE stack. * * @details Initializes the SoftDevice and the BLE event interrupts. */ static void app_ble_stack_init(void) { ret_code_t err_code; err_code = nrf_sdh_enable_request(); APP_ERROR_CHECK(err_code); // Configure the BLE stack using the default settings. // Fetch the start address of the application RAM. uint32_t ram_start = 0; err_code = nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start); APP_ERROR_CHECK(err_code); // Enable BLE stack. err_code = nrf_sdh_ble_enable(&ram_start); APP_ERROR_CHECK(err_code); // Register a handler for BLE events. NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL); NRF_LOG_INFO("BLE stack initialized."); } /**@brief Function for initializing the log. */ static void log_init(void) { ret_code_t err_code = NRF_LOG_INIT(NULL); APP_ERROR_CHECK(err_code); NRF_LOG_DEFAULT_BACKENDS_INIT(); NRF_LOG_INFO("Logging initialized."); } /**@brief Function for initializing the clock. */ static void clock_init(void) { ret_code_t err_code = nrf_drv_clock_init(); APP_ERROR_CHECK(err_code); } /**@brief A function which is hooked to idle task. * @note Idle hook must be enabled in FreeRTOS configuration (configUSE_IDLE_HOOK). */ void vApplicationIdleHook( void ) { /*void*/ } /**@brief Function for initializing the GATT module. */ static void app_ble_gatt_init(void) { ret_code_t err_code = nrf_ble_gatt_init(&m_gatt, NULL); APP_ERROR_CHECK(err_code); NRF_LOG_INFO("GATT initialized."); } /**@brief LED task entry function. * * @param[in] pvParameter Pointer that will be used as the parameter for the task. */ static void led_toggle_task_function (void * pvParameter) { NRF_LOG_INFO("LED toggle task initialized."); UNUSED_PARAMETER(pvParameter); while (true) { bsp_board_led_invert(BSP_BOARD_LED_2); vTaskDelay(TASK_DELAY); } } /**@brief Function for initializing the BSP module. */ static void led_init(void) { bsp_board_init(BSP_INIT_LEDS); bsp_board_led_on(BSP_BOARD_LED_0); NRF_LOG_INFO("LEDs initialized."); // Start blinking LED3. if (pdPASS != xTaskCreate(led_toggle_task_function, "LED", 128, NULL, 3, &m_led_thread)) { APP_ERROR_HANDLER(NRF_ERROR_NO_MEM); } } int main(void) { // Initialize modules. log_init(); clock_init(); // Configure and initialize BLE stack and modules. app_ble_stack_init(); app_ble_gatt_init(); led_init(); // Create a FreeRTOS task for the BLE stack. // The task will run app_ble_scan_start(NULL) before entering its loop. nrf_sdh_freertos_init(app_ble_scan_start, NULL); // Start FreeRTOS scheduler. vTaskStartScheduler(); // application should never leave FreeRTOS scheduler and reach this point for (;;) { APP_ERROR_HANDLER(NRF_ERROR_FORBIDDEN); } }