File content as of revision 6:cf06ba884429:

/*
 * Copyright (C) 2011-2012 by Matthias Ringwald
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 * 4. This software may not be used in a commercial product
 *    without an explicit license granted by the copyright holder.
 *
 * THIS SOFTWARE IS PROVIDED BY MATTHIAS RINGWALD AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

/*  Change history
 2013/2/10: by todotani
  Modified tick event handler
  Modified LED control
  - LED 3 flush when connected
  - LED 2 OFF in case write attribute, ON in case read attribute
  - LED 1 OFF of after start of advertisement, then reflect write value to 0xFFF2
2013/2/11: by todotani
  Changed serial pc.baud (115200 to 921600) to avoid imcomplete connection issue
  Disable btstack debug-log
2013/2/20: by todotani
  Change tick timer interval 250ms to 1ms
  Change Attribute 0xFFF1 as read DigitalIn p5 of mbed
*/

//*****************************************************************************
//
// att device demo
//
//*****************************************************************************

// TODO: seperate BR/EDR from LE ACL buffers
// TODO: move LE init into HCI
// ..

// NOTE: Supports only a single connection

// mbed specific
#include "mbed.h"
Serial pc(USBTX, USBRX);
DigitalOut led1(LED1), led2(LED2), led3(LED3);
DigitalIn  sw1(p5);

// from btstack ble_server.c
#include "global.h"
#include "debug.h"
#include "btstack/btstack.h"
#include "btstack/hci_cmds.h"
#include "btstack/run_loop.h"
#include "btstack/hal_tick.h"

#include "hci.h"
#include "l2cap.h"
#include "btstack_memory.h"
#include "remote_device_db.h"
#include "config.h"

#include "att.h"

hci_transport_t * hci_transport_picusb_instance();

static att_connection_t att_connection;
static uint16_t         att_response_handle = 0;
static uint16_t         att_response_size   = 0;
static uint8_t          att_response_buffer[28];

static uint8_t          switch_new_state   = 1;
static uint8_t          switch_old_state   = 1;

void hexdump2(void *data, int size)
{
    int i;
    for (i=0; i<size; i++) {
        log_info("%02X ", ((uint8_t *)data)[i]);
    }
    log_info("\n");
}

static void att_try_respond(void)
{
    if (!att_response_size) return;
    if (!att_response_handle) return;
    if (!hci_can_send_packet_now(HCI_ACL_DATA_PACKET)) return;

    // update state before sending packet
    uint16_t size = att_response_size;
    att_response_size = 0;
    l2cap_send_connectionless(att_response_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, att_response_buffer, size);
}


static void att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size)
{
    if (packet_type != ATT_DATA_PACKET) return;

    att_response_handle = handle;
    att_response_size = att_handle_request(&att_connection, packet, size, att_response_buffer);
    att_try_respond();
}


// enable LE, setup ADV data
static void packet_handler (void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size)
{
    static bd_addr_t addr;
    // Data for advertisement and scan response
    const uint8_t adv_data[31]="\x02\x01\x05" "\x05\x09mbed" "\x03\x02\xf0\xff";
    switch (packet_type) {

        case HCI_EVENT_PACKET:
            switch (packet[0]) {

                case BTSTACK_EVENT_STATE:
                    // bt stack activated, get started - set local name
                    if (packet[2] == HCI_STATE_WORKING) {
                        log_info("Working!\n");
                        hci_send_cmd(&hci_read_local_supported_features);
                    }
                    break;

                case DAEMON_EVENT_HCI_PACKET_SENT:
                    att_try_respond();
                    break;

                case HCI_EVENT_LE_META:
                    switch (packet[2]) {
                        case HCI_SUBEVENT_LE_CONNECTION_COMPLETE:
                            // reset connection MTU
                            att_connection.mtu = 23;
                            break;
                        default:
                            break;
                    }
                    break;

                case BTSTACK_EVENT_NR_CONNECTIONS_CHANGED:
                    if (packet[2]) {
                        connection_status=1;
                        log_info("CONNECTED\n");
                    } else {
                        connection_status=0;
                        log_info("NOT CONNECTED\n");
                    }
                    break;

                case HCI_EVENT_DISCONNECTION_COMPLETE:
                    att_response_handle =0;
                    att_response_size = 0;

                    // restart advertising
                    hci_send_cmd(&hci_le_set_advertise_enable, 1);
                    break;

                case HCI_EVENT_COMMAND_COMPLETE:
                    if (COMMAND_COMPLETE_EVENT(packet, hci_read_bd_addr)) {
                        bt_flip_addr(addr, &packet[6]);
                        log_info("BD ADDR: %s\n", bd_addr_to_str(addr));
                        break;
                    }
                    if (COMMAND_COMPLETE_EVENT(packet, hci_read_local_supported_features)) {
                        log_info("Local supported features: %04lX%04lX\n", READ_BT_32(packet, 10), READ_BT_32(packet, 6));
                        hci_send_cmd(&hci_set_event_mask, 0xffffffff, 0x20001fff);
                        break;
                    }
                    if (COMMAND_COMPLETE_EVENT(packet, hci_set_event_mask)) {
                        hci_send_cmd(&hci_write_le_host_supported, 1, 1);
                        break;
                    }
                    if (COMMAND_COMPLETE_EVENT(packet, hci_write_le_host_supported)) {
                        hci_send_cmd(&hci_le_set_event_mask, 0xffffffff, 0xffffffff);
                        break;
                    }
                    if (COMMAND_COMPLETE_EVENT(packet, hci_le_set_event_mask)) {
                        hci_send_cmd(&hci_le_read_buffer_size);
                        break;
                    }
                    if (COMMAND_COMPLETE_EVENT(packet, hci_le_read_buffer_size)) {
                        log_info("LE buffer size: %u, count %u\n", READ_BT_16(packet,6), packet[8]);
                        hci_send_cmd(&hci_le_read_supported_states);
                        break;
                    }
                    if (COMMAND_COMPLETE_EVENT(packet, hci_le_read_supported_states)) {
                        hci_send_cmd(&hci_le_set_advertising_parameters,  0x0400, 0x0800, 0, 0, 0, &addr, 0x07, 0);
                        break;
                    }
                    if (COMMAND_COMPLETE_EVENT(packet, hci_le_set_advertising_parameters)) {
                        hci_send_cmd(&hci_le_set_advertising_data, sizeof(adv_data), adv_data);
                        break;
                    }
                    if (COMMAND_COMPLETE_EVENT(packet, hci_le_set_advertising_data)) {
                        hci_send_cmd(&hci_le_set_scan_response_data, 10, adv_data);
                        break;
                    }
                    if (COMMAND_COMPLETE_EVENT(packet, hci_le_set_scan_response_data)) {
                        hci_send_cmd(&hci_le_set_advertise_enable, 1);
                        break;
                    }
                    if (COMMAND_COMPLETE_EVENT(packet, hci_le_set_advertise_enable)) {
                        hci_discoverable_control(1);
                        log_info("startup_state=1\n");
                        startup_state=1;
                        led1 = 0;
                        break;
                    }

            }
    }
}

// test profile
#include "profile.h"

static uint8_t strbuf[80];
static uint8_t  ledvalue;

// read requests
static uint16_t att_read_callback(uint16_t handle, uint16_t offset, uint8_t * buffer, uint16_t buffer_size)
{
    uint16_t    ret=0,val;

    if(buffer) {
        log_info("READ Callback, handle %04x\n", handle);
        led2 = 1;
    }
    switch(handle) {
            // Correspond to Characteristics 0xFFF1
        case 0x000b:
            if(buffer && ret<=buffer_size) {
                buffer[0] = sw1.read();
                log_info("Read value: %u\n", buffer[0]);
            }
            ret = 1;
            break;

            // Correspond to Characteristics 0xFFF2
        case 0x000d:
            if(buffer && buffer_size) {
                ledvalue = led1;
                buffer[0] = ledvalue;
                log_info("Read value: %u\n", buffer[0]);
            }
            ret=1;
            break;

            // Correspond to Characteristics 0x00001234-0000-1000-8000-00805F9B34FB
        case 0x000f:
            if(buffer && buffer_size>=2) {
                val=timer_counter;
                log_info("Read value: %u\n", val);
                buffer[0]=val&0xff;
                buffer[1]=val>>8;
            }
            ret=2;
            break;
    }
    return ret;
}

// write requests
static void att_write_callback(uint16_t handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size, signature_t * signature)
{
    log_info("WRITE Callback, handle %04x\n", handle);
    led2 = 0;
    switch(handle) {
            // Correspond to Characteristics 0xFFF1
        case 0x000b:
            log_info("No action\n");
            break;

            // Correspond to Characteristics 0xFFF2
        case 0x000d:
            log_info("New value: %u\n", buffer[0]);
            ledvalue = buffer[0];
            led1 = ledvalue;
            break;
    }
}


void hal_tick_event(void)
{
    timer_counter++;

    if(connection_status) {
        if(timer_counter % 250 == 0) {
            led3 = !led3;
            //  Under testing
            //            switch_new_state = (uint8_t)sw1.read();
            //            if (switch_new_state != switch_old_state) {
            //                log_info("Fire notification\n");
            //                switch_old_state = switch_new_state;
            //                att_prepare_handle_value_notification(&att_connection, 0x000b, &switch_new_state, 1, att_response_buffer);
        }
    } else {
        led3 = 1;
    }
}

// main
int main(void)
{
    pc.baud(921600);
    //pc.baud(230400);
    log_info("%s\n", __FILE__);

    // init LEDs
    led1 = led2 = led3 = 1;
    ledvalue = led1;

    /// GET STARTED with BTstack ///
    btstack_memory_init();
    run_loop_init(RUN_LOOP_EMBEDDED);
    hal_tick_set_handler(&hal_tick_event);

    // init HCI
    // use BlueUSB
    hci_transport_t* transport = hci_transport_usb_instance();
    bt_control_t       * control   = NULL;
    hci_uart_config_t  * config    = NULL;
    remote_device_db_t * remote_db = (remote_device_db_t *) &remote_device_db_memory;
    hci_init(transport, config, control, remote_db);

    // use eHCILL
    // bt_control_cc256x_enable_ehcill(1);

    // set up l2cap_le
    l2cap_init();
    l2cap_register_fixed_channel(att_packet_handler, L2CAP_CID_ATTRIBUTE_PROTOCOL);
    l2cap_register_packet_handler(packet_handler);

    // set up ATT
    att_set_db(profile_data);
    att_set_write_callback(att_write_callback);
    att_set_read_callback(att_read_callback);
    att_dump_attributes();
    att_connection.mtu = 27;

    log_info("Run...\n\n");

    // turn on!
    hci_power_control(HCI_POWER_ON);

    // go!
    run_loop_execute();

    // happy compiler!
    return 0;
}