324 lines
9.8 KiB
C
324 lines
9.8 KiB
C
/* Copyright (c) 2012 Nordic Semiconductor. All Rights Reserved.
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*
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* The information contained herein is property of Nordic Semiconductor ASA.
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* Terms and conditions of usage are described in detail in NORDIC
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* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
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*
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* Licensees are granted free, non-transferable use of the information. NO
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* WARRANTY of ANY KIND is provided. This heading must NOT be removed from
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* the file.
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*
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*/
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#include "ble_conn_params.h"
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#include <stdlib.h>
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#include "nordic_common.h"
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#include "ble_hci.h"
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#include "app_timer.h"
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#include "ble_srv_common.h"
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#include "app_util.h"
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static ble_conn_params_init_t m_conn_params_config; /**< Configuration as specified by the application. */
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static ble_gap_conn_params_t m_preferred_conn_params; /**< Connection parameters preferred by the application. */
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static uint8_t m_update_count; /**< Number of Connection Parameter Update messages that has currently been sent. */
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static uint16_t m_conn_handle; /**< Current connection handle. */
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static ble_gap_conn_params_t m_current_conn_params; /**< Connection parameters received in the most recent Connect event. */
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APP_TIMER_DEF(m_conn_params_timer_id); /**< Connection parameters timer. */
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static bool m_change_param = false;
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static bool is_conn_params_ok(ble_gap_conn_params_t * p_conn_params)
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{
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// Check if interval is within the acceptable range.
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// NOTE: Using max_conn_interval in the received event data because this contains
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// the client's connection interval.
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if (
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(p_conn_params->max_conn_interval >= m_preferred_conn_params.min_conn_interval)
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&&
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(p_conn_params->max_conn_interval <= m_preferred_conn_params.max_conn_interval)
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)
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{
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return true;
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}
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else
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{
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return false;
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}
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}
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static void update_timeout_handler(void * p_context)
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{
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UNUSED_PARAMETER(p_context);
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if (m_conn_handle != BLE_CONN_HANDLE_INVALID)
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{
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// Check if we have reached the maximum number of attempts
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m_update_count++;
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if (m_update_count <= m_conn_params_config.max_conn_params_update_count)
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{
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uint32_t err_code;
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// Parameters are not ok, send connection parameters update request.
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err_code = sd_ble_gap_conn_param_update(m_conn_handle, &m_preferred_conn_params);
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if ((err_code != NRF_SUCCESS) && (m_conn_params_config.error_handler != NULL))
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{
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m_conn_params_config.error_handler(err_code);
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}
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}
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else
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{
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m_update_count = 0;
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// Negotiation failed, disconnect automatically if this has been configured
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if (m_conn_params_config.disconnect_on_fail)
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{
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uint32_t err_code;
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err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE);
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if ((err_code != NRF_SUCCESS) && (m_conn_params_config.error_handler != NULL))
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{
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m_conn_params_config.error_handler(err_code);
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}
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}
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// Notify the application that the procedure has failed
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if (m_conn_params_config.evt_handler != NULL)
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{
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ble_conn_params_evt_t evt;
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evt.evt_type = BLE_CONN_PARAMS_EVT_FAILED;
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m_conn_params_config.evt_handler(&evt);
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}
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}
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}
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}
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uint32_t ble_conn_params_init(const ble_conn_params_init_t * p_init)
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{
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uint32_t err_code;
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m_conn_params_config = *p_init;
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m_change_param = false;
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if (p_init->p_conn_params != NULL)
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{
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m_preferred_conn_params = *p_init->p_conn_params;
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// Set the connection params in stack
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err_code = sd_ble_gap_ppcp_set(&m_preferred_conn_params);
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if (err_code != NRF_SUCCESS)
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{
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return err_code;
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}
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}
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else
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{
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// Fetch the connection params from stack
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err_code = sd_ble_gap_ppcp_get(&m_preferred_conn_params);
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if (err_code != NRF_SUCCESS)
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{
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return err_code;
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}
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}
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m_conn_handle = BLE_CONN_HANDLE_INVALID;
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m_update_count = 0;
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return app_timer_create(&m_conn_params_timer_id,
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APP_TIMER_MODE_SINGLE_SHOT,
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update_timeout_handler);
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}
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uint32_t ble_conn_params_stop(void)
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{
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return app_timer_stop(m_conn_params_timer_id);
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}
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static void conn_params_negotiation(void)
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{
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// Start negotiation if the received connection parameters are not acceptable
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if (!is_conn_params_ok(&m_current_conn_params))
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{
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uint32_t err_code;
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uint32_t timeout_ticks;
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if (m_change_param)
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{
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// Notify the application that the procedure has failed
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if (m_conn_params_config.evt_handler != NULL)
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{
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ble_conn_params_evt_t evt;
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evt.evt_type = BLE_CONN_PARAMS_EVT_FAILED;
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m_conn_params_config.evt_handler(&evt);
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}
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}
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else
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{
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if (m_update_count == 0)
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{
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// First connection parameter update
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timeout_ticks = m_conn_params_config.first_conn_params_update_delay;
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}
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else
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{
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timeout_ticks = m_conn_params_config.next_conn_params_update_delay;
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}
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err_code = app_timer_start(m_conn_params_timer_id, timeout_ticks, NULL);
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if ((err_code != NRF_SUCCESS) && (m_conn_params_config.error_handler != NULL))
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{
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m_conn_params_config.error_handler(err_code);
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}
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}
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}
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else
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{
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// Notify the application that the procedure has succeded
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if (m_conn_params_config.evt_handler != NULL)
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{
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ble_conn_params_evt_t evt;
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evt.evt_type = BLE_CONN_PARAMS_EVT_SUCCEEDED;
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m_conn_params_config.evt_handler(&evt);
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}
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}
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m_change_param = false;
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}
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static void on_connect(ble_evt_t * p_ble_evt)
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{
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// Save connection parameters
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m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
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m_current_conn_params = p_ble_evt->evt.gap_evt.params.connected.conn_params;
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m_update_count = 0; // Connection parameter negotiation should re-start every connection
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// Check if we shall handle negotiation on connect
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if (m_conn_params_config.start_on_notify_cccd_handle == BLE_GATT_HANDLE_INVALID)
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{
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conn_params_negotiation();
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}
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}
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static void on_disconnect(ble_evt_t * p_ble_evt)
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{
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uint32_t err_code;
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m_conn_handle = BLE_CONN_HANDLE_INVALID;
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// Stop timer if running
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m_update_count = 0; // Connection parameters updates should happen during every connection
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err_code = app_timer_stop(m_conn_params_timer_id);
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if ((err_code != NRF_SUCCESS) && (m_conn_params_config.error_handler != NULL))
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{
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m_conn_params_config.error_handler(err_code);
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}
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}
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static void on_write(ble_evt_t * p_ble_evt)
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{
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ble_gatts_evt_write_t * p_evt_write = &p_ble_evt->evt.gatts_evt.params.write;
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// Check if this the correct CCCD
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if (
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(p_evt_write->handle == m_conn_params_config.start_on_notify_cccd_handle)
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&&
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(p_evt_write->len == 2)
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)
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{
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// Check if this is a 'start notification'
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if (ble_srv_is_notification_enabled(p_evt_write->data))
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{
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// Do connection parameter negotiation if necessary
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conn_params_negotiation();
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}
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else
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{
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uint32_t err_code;
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// Stop timer if running
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err_code = app_timer_stop(m_conn_params_timer_id);
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if ((err_code != NRF_SUCCESS) && (m_conn_params_config.error_handler != NULL))
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{
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m_conn_params_config.error_handler(err_code);
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}
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}
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}
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}
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static void on_conn_params_update(ble_evt_t * p_ble_evt)
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{
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// Copy the parameters
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m_current_conn_params = p_ble_evt->evt.gap_evt.params.conn_param_update.conn_params;
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conn_params_negotiation();
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}
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void ble_conn_params_on_ble_evt(ble_evt_t * p_ble_evt)
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{
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switch (p_ble_evt->header.evt_id)
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{
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case BLE_GAP_EVT_CONNECTED:
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on_connect(p_ble_evt);
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break;
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case BLE_GAP_EVT_DISCONNECTED:
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on_disconnect(p_ble_evt);
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break;
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case BLE_GATTS_EVT_WRITE:
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on_write(p_ble_evt);
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break;
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case BLE_GAP_EVT_CONN_PARAM_UPDATE:
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on_conn_params_update(p_ble_evt);
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break;
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default:
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// No implementation needed.
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break;
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}
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}
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uint32_t ble_conn_params_change_conn_params(ble_gap_conn_params_t * new_params)
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{
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uint32_t err_code;
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m_preferred_conn_params = *new_params;
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// Set the connection params in stack
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err_code = sd_ble_gap_ppcp_set(&m_preferred_conn_params);
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if (err_code == NRF_SUCCESS)
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{
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if (!is_conn_params_ok(&m_current_conn_params))
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{
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m_change_param = true;
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err_code = sd_ble_gap_conn_param_update(m_conn_handle, &m_preferred_conn_params);
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m_update_count = 1;
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}
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else
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{
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// Notify the application that the procedure has succeded
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if (m_conn_params_config.evt_handler != NULL)
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{
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ble_conn_params_evt_t evt;
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evt.evt_type = BLE_CONN_PARAMS_EVT_SUCCEEDED;
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m_conn_params_config.evt_handler(&evt);
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}
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err_code = NRF_SUCCESS;
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}
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}
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return err_code;
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}
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