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/**
* The MIT License (MIT)
*
* Copyright (c) 2013 Paulo B. de Oliveira Filho <pauloborgesfilho@gmail.com>
* Copyright (c) 2013 Claudio Takahasi <claudio.takahasi@gmail.com>
* Copyright (c) 2013 João Paulo Rechi Vita <jprvita@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "log.h"
#include "radio.h"
#include "timer.h"
#include "ll.h"
/* Link Layer specification Section 2.1, Core 4.1 page 2503 */
#define LL_MTU 39
/* Link Layer specification Section 2.3, Core 4.1 pages 2504-2505 */
#define LL_MTU_ADV 37
/* Link Layer specification Section 2.1.2, Core 4.1 page 2503 */
#define LL_ACCESS_ADDRESS_ADV 0x8E89BED6
/* TODO: doc */
#define LL_CRC_ADV 0x555555
/* TODO:
* 1. Create a config.h for address and address type;
* 1.1. Create enum type for address type;
*/
static struct {
uint8_t address[6];
uint8_t address_type;
} config = { {0xFE, 0xCA, 0xFE, 0xCA, 0xBA, 0xBE}, 0};
/* Link Layer specification Section 1.1, Core 4.1 page 2499 */
typedef enum ll_states {
LL_STATE_STANDBY,
LL_STATE_ADVERTISING,
LL_STATE_SCANNING,
LL_INITIATING_SCANNING,
LL_CONNECTION_SCANNING,
} ll_states_t;
/* Link Layer specification Section 2.3, Core 4.1 page 2505 */
typedef enum ll_pdu_type {
LL_PDU_ADV_IND, /* connectable undirected */
LL_PDU_ADV_DIRECT_IND, /* connectable directed */
LL_PDU_ADV_NONCONN_IND, /* non-connectable undirected */
LL_PDU_SCAN_REQ,
LL_PDU_SCAN_RSP,
LL_PDU_CONNECT_REQ,
LL_PDU_ADV_SCAN_IND /* scannable undirected */
} ll_pdu_type_t;
/* Link Layer specification Section 2.3, Core 4.1 pages 2504-2505 */
typedef struct ll_pdu_adv {
uint8_t pdu_type:4;
uint8_t _rfu_0:2;
uint8_t tx_add:1;
uint8_t rx_add:1;
uint8_t length:6; /* 6 <= length <= 37 */
uint8_t _rfu_1:2;
uint8_t payload[LL_MTU_ADV];
} __attribute__ ((packed)) ll_pdu_adv_t;
static ll_states_t current_state;
static uint8_t adv_chs[] = { 37, 38, 39 };
static uint8_t adv_ch_idx = 0;
static int16_t t_adv_event;
static uint32_t t_adv_event_interval;
static int16_t t_adv_pdu;
static uint32_t t_adv_pdu_interval;
static ll_pdu_adv_t pdu_adv;
static void t_adv_event_cb(void *user_data)
{
adv_ch_idx = 0;
radio_send(adv_chs[adv_ch_idx++], LL_ACCESS_ADDRESS_ADV, LL_CRC_ADV,
(uint8_t *) &pdu_adv, sizeof(pdu_adv));
timer_start(t_adv_pdu, t_adv_pdu_interval, NULL);
}
static void t_adv_pdu_cb(void *user_data)
{
radio_send(adv_chs[adv_ch_idx++], LL_ACCESS_ADDRESS_ADV, LL_CRC_ADV,
(uint8_t *) &pdu_adv, sizeof(pdu_adv));
if (adv_ch_idx < 3)
timer_start(t_adv_pdu, t_adv_pdu_interval, NULL);
}
int ll_advertise_start(ll_adv_type_t type, uint8_t *data, uint8_t len)
{
if (current_state != LL_STATE_STANDBY)
return -1;
memset(&pdu_adv, 0, sizeof(pdu_adv));
switch (type) {
case LL_ADV_NONCONN_UNDIR:
pdu_adv.pdu_type = LL_PDU_ADV_NONCONN_IND;
pdu_adv.tx_add = config.address_type == 0 ? 0 : 1;
pdu_adv.length = len + sizeof(config.address);
memcpy(pdu_adv.payload, config.address, sizeof(config.address));
memcpy(pdu_adv.payload + sizeof(config.address), data, len);
t_adv_event_interval = 100; /* <= 1024ms, Sec 4.4.2.2 pag 2528 */
t_adv_pdu_interval = 5; /* <= 10ms Sec 4.4.2.6 pag 2534*/
break;
case LL_ADV_SCAN_UNDIR:
case LL_ADV_CONN_UNDIR:
case LL_ADV_CONN_DIR:
/* Not implemented */
return -1;
break;
}
DBG("Starting advertise: PDU interval %ums, event interval %ums",
t_adv_pdu_interval, t_adv_event_interval);
current_state = LL_STATE_ADVERTISING;
adv_ch_idx = 0;
timer_start(t_adv_event, t_adv_event_interval, NULL);
timer_start(t_adv_pdu, t_adv_pdu_interval, NULL);
radio_send(adv_chs[adv_ch_idx++], LL_ACCESS_ADDRESS_ADV, LL_CRC_ADV,
(uint8_t *) &pdu_adv, sizeof(pdu_adv));
return 0;
}
int ll_advertise_stop()
{
if (current_state != LL_STATE_ADVERTISING)
return -1;
timer_stop(t_adv_pdu);
timer_stop(t_adv_event);
current_state = LL_STATE_STANDBY;
return 0;
}
int ll_init(void)
{
log_init();
timer_init();
radio_init();
current_state = LL_STATE_STANDBY;
t_adv_event = timer_create(TIMER_REPEATED, t_adv_event_cb);
t_adv_pdu = timer_create(TIMER_SINGLESHOT, t_adv_pdu_cb);
return 0;
}
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