mirror of
https://github.com/bluekitchen/btstack.git
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262 lines
9.9 KiB
C
262 lines
9.9 KiB
C
/*
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* Copyright (C) 2014 BlueKitchen GmbH
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holders nor the names of
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* 4. Any redistribution, use, or modification is done solely for
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* personal benefit and not for any commercial purpose or for
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* monetary gain.
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*
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* THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
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* RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Please inquire about commercial licensing options at
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* contact@bluekitchen-gmbh.com
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*
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*/
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// *****************************************************************************
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/* EXAMPLE_START(gap_inquiry): GAP Inquiry Example
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*
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* @text The Generic Access Profile (GAP) defines how Bluetooth devices discover
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* and establish a connection with each other. In this example, the application
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* discovers surrounding Bluetooth devices and collects their Class of Device
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* (CoD), page scan mode, clock offset, and RSSI. After that, the remote name of
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* each device is requested. In the following section we outline the Bluetooth
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* logic part, i.e., how the packet handler handles the asynchronous events and
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* data packets.
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*/
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// *****************************************************************************
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "btstack-config.h"
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#include "run_loop.h"
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#include "debug.h"
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#include "btstack_memory.h"
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#include "hci.h"
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#include "hci_dump.h"
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#include "classic/sdp_util.h"
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#define MAX_DEVICES 10
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enum DEVICE_STATE { REMOTE_NAME_REQUEST, REMOTE_NAME_INQUIRED, REMOTE_NAME_FETCHED };
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struct device {
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bd_addr_t address;
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uint16_t clockOffset;
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uint32_t classOfDevice;
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uint8_t pageScanRepetitionMode;
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uint8_t rssi;
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enum DEVICE_STATE state;
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};
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#define INQUIRY_INTERVAL 5
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struct device devices[MAX_DEVICES];
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int deviceCount = 0;
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enum STATE {INIT, ACTIVE} ;
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enum STATE state = INIT;
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static int getDeviceIndexForAddress( bd_addr_t addr){
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int j;
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for (j=0; j< deviceCount; j++){
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if (BD_ADDR_CMP(addr, devices[j].address) == 0){
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return j;
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}
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}
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return -1;
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}
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static void start_scan(void){
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printf("Starting inquiry scan..\n");
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hci_send_cmd(&hci_inquiry, HCI_INQUIRY_LAP, INQUIRY_INTERVAL, 0);
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}
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static int has_more_remote_name_requests(void){
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int i;
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for (i=0;i<deviceCount;i++) {
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if (devices[i].state == REMOTE_NAME_REQUEST) return 1;
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}
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return 0;
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}
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static void do_next_remote_name_request(void){
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int i;
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for (i=0;i<deviceCount;i++) {
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// remote name request
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if (devices[i].state == REMOTE_NAME_REQUEST){
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devices[i].state = REMOTE_NAME_INQUIRED;
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printf("Get remote name of %s...\n", bd_addr_to_str(devices[i].address));
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hci_send_cmd(&hci_remote_name_request, devices[i].address,
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devices[i].pageScanRepetitionMode, 0, devices[i].clockOffset | 0x8000);
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return;
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}
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}
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}
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static void continue_remote_names(void){
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if (has_more_remote_name_requests()){
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do_next_remote_name_request();
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return;
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}
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start_scan();
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}
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/* @section Bluetooth Logic
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*
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* @text The Bluetooth logic is implemented as a state machine within the packet
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* handler. In this example, the following states are passed sequentially:
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* INIT, and ACTIVE.
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*/
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static void packet_handler (uint8_t packet_type, uint8_t *packet, uint16_t size){
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bd_addr_t addr;
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int i;
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int numResponses;
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int index;
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// printf("packet_handler: pt: 0x%02x, packet[0]: 0x%02x\n", packet_type, packet[0]);
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if (packet_type != HCI_EVENT_PACKET) return;
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uint8_t event = packet[0];
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switch(state){
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/* @text In INIT, an inquiry scan is started, and the application transits to
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* ACTIVE state.
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*/
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case INIT:
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if (packet[2] == HCI_STATE_WORKING) {
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start_scan();
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state = ACTIVE;
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}
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break;
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/* @text In ACTIVE, the following events are processed:
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* - Inquiry result event: the list of discovered devices is processed and the
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* Class of Device (CoD), page scan mode, clock offset, and RSSI are stored in a table.
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* - Inquiry complete event: the remote name is requested for devices without a fetched
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* name. The state of a remote name can be one of the following:
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* REMOTE_NAME_REQUEST, REMOTE_NAME_INQUIRED, or REMOTE_NAME_FETCHED.
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* - Remote name cached event: prints cached remote names provided by BTstack,
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* if persistent storage is provided.
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* - Remote name request complete event: the remote name is stored in the table and the
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* state is updated to REMOTE_NAME_FETCHED. The query of remote names is continued.
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*/
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case ACTIVE:
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switch(event){
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case HCI_EVENT_INQUIRY_RESULT:
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case HCI_EVENT_INQUIRY_RESULT_WITH_RSSI:
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numResponses = packet[2];
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for (i=0; i<numResponses && deviceCount < MAX_DEVICES;i++){
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bt_flip_addr(addr, &packet[3+i*6]);
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index = getDeviceIndexForAddress(addr);
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if (index >= 0) continue; // already in our list
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memcpy(devices[deviceCount].address, addr, 6);
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devices[deviceCount].pageScanRepetitionMode = packet [3 + numResponses*(6) + i*1];
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if (event == HCI_EVENT_INQUIRY_RESULT){
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devices[deviceCount].classOfDevice = READ_BT_24(packet, 3 + numResponses*(6+1+1+1) + i*3);
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devices[deviceCount].clockOffset = READ_BT_16(packet, 3 + numResponses*(6+1+1+1+3) + i*2) & 0x7fff;
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devices[deviceCount].rssi = 0;
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} else {
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devices[deviceCount].classOfDevice = READ_BT_24(packet, 3 + numResponses*(6+1+1) + i*3);
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devices[deviceCount].clockOffset = READ_BT_16(packet, 3 + numResponses*(6+1+1+3) + i*2) & 0x7fff;
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devices[deviceCount].rssi = packet [3 + numResponses*(6+1+1+3+2) + i*1];
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}
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devices[deviceCount].state = REMOTE_NAME_REQUEST;
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printf("Device found: %s with COD: 0x%06x, pageScan %d, clock offset 0x%04x, rssi 0x%02x\n", bd_addr_to_str(addr),
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devices[deviceCount].classOfDevice, devices[deviceCount].pageScanRepetitionMode,
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devices[deviceCount].clockOffset, devices[deviceCount].rssi);
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deviceCount++;
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}
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break;
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case HCI_EVENT_INQUIRY_COMPLETE:
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for (i=0;i<deviceCount;i++) {
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// retry remote name request
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if (devices[i].state == REMOTE_NAME_INQUIRED)
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devices[i].state = REMOTE_NAME_REQUEST;
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}
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continue_remote_names();
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break;
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case BTSTACK_EVENT_REMOTE_NAME_CACHED:
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bt_flip_addr(addr, &packet[3]);
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printf("Cached remote name for %s: '%s'\n", bd_addr_to_str(addr), &packet[9]);
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break;
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case HCI_EVENT_REMOTE_NAME_REQUEST_COMPLETE:
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bt_flip_addr(addr, &packet[3]);
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index = getDeviceIndexForAddress(addr);
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if (index >= 0) {
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if (packet[2] == 0) {
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printf("Name: '%s'\n", &packet[9]);
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devices[index].state = REMOTE_NAME_FETCHED;
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} else {
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printf("Failed to get name: page timeout\n");
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}
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}
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continue_remote_names();
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break;
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default:
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break;
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}
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break;
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default:
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break;
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}
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}
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/* @text For more details on discovering remote devices, please see
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* Section on [GAP](../profiles/#sec:GAPdiscoverRemoteDevices).
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*/
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/* @section Main Application Setup
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*
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* @text Listing MainConfiguration shows main application code.
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* It registers the HCI packet handler and starts the Bluetooth stack.
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*/
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/* LISTING_START(MainConfiguration): Setup packet handler for GAP inquiry */
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int btstack_main(int argc, const char * argv[]);
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int btstack_main(int argc, const char * argv[]) {
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hci_register_packet_handler(packet_handler);
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// turn on!
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hci_power_control(HCI_POWER_ON);
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return 0;
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}
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/* LISTING_END */
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/* EXAMPLE_END */
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