contiki/cpu/nrf52832/ble/ble-mac.c

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2016-01-09 13:44:18 +00:00
/*
* Copyright (c) 2015, Nordic Semiconductor
* All rights reserved.
*
* 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 Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 THE INSTITUTE 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.
*
*/
/**
* \addtogroup nrf52832-ble
* @{
*
* \file
* A MAC protocol implementation that uses nRF52 IPSP implementation
* as a link layer.
* \author
* Wojciech Bober <wojciech.bober@nordicsemi.no>
*/
#include <stdint.h>
#include <ble-core.h>
#include "app_error.h"
#include "ble_ipsp.h"
#include "nrf_soc.h"
#include "iot_defines.h"
#include "net/mac/nullmac.h"
#include "net/netstack.h"
#include "net/ip/uip.h"
#include "net/ip/tcpip.h"
#include "net/packetbuf.h"
#include "net/netstack.h"
#include "net/linkaddr.h"
#include "dev/watchdog.h"
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
#ifndef BLE_MAC_MAX_INTERFACE_NUM
#define BLE_MAC_MAX_INTERFACE_NUM 1 /**< Maximum number of interfaces, i.e., connection to master devices */
#endif
/*---------------------------------------------------------------------------*/
process_event_t ble_event_interface_added; /**< This event is broadcast when BLE connection is established */
process_event_t ble_event_interface_deleted; /**< This event is broadcast when BLE connection is destroyed */
/*---------------------------------------------------------------------------*/
PROCESS(ble_ipsp_process, "BLE IPSP process");
/*---------------------------------------------------------------------------*/
/**
* \brief A structure that binds IPSP connection with a peer address.
*/
typedef struct {
eui64_t peer_addr;
ble_ipsp_handle_t handle;
} ble_mac_interface_t;
static ble_mac_interface_t interfaces[BLE_MAC_MAX_INTERFACE_NUM];
static volatile int busy_tx; /**< Flag is set to 1 when the driver is busy transmitting a packet. */
static volatile int busy_rx; /**< Flag is set to 1 when there is a received packet pending. */
struct {
eui64_t src;
uint8_t payload[PACKETBUF_SIZE];
uint16_t len;
int8_t rssi;
} input_packet;
static mac_callback_t mac_sent_cb;
static void *mac_sent_ptr;
/*---------------------------------------------------------------------------*/
/**
* \brief Lookup interface by IPSP connection.
*
* \param handle a pointer to IPSP handle.
* \retval a pointer to interface structure
* \retval NULL if no interface has been found for a given handle
*/
static ble_mac_interface_t *
ble_mac_interface_lookup(ble_ipsp_handle_t *handle)
{
int i;
for(i = 0; i < BLE_MAC_MAX_INTERFACE_NUM; i++) {
if(interfaces[i].handle.conn_handle == handle->conn_handle &&
interfaces[i].handle.cid == handle->cid) {
return &interfaces[i];
}
}
return NULL;
}
/*---------------------------------------------------------------------------*/
/**
* \brief Add IPSP connection to the interface table.
*
* This function binds IPSP connection with peer address.
*
* \param peer a pointer to eui64 address
* \param handle a pointer to IPSP handle
*
* \retval a pointer to an interface structure on success
* \retval NULL if interface table is full
*/
static ble_mac_interface_t *
ble_mac_interface_add(eui64_t *peer, ble_ipsp_handle_t *handle)
{
int i;
for(i = 0; i < BLE_MAC_MAX_INTERFACE_NUM; i++) {
if(interfaces[i].handle.conn_handle == 0 && interfaces[i].handle.cid == 0) {
memcpy(&interfaces[i].handle, handle, sizeof(ble_ipsp_handle_t));
memcpy(&interfaces[i].peer_addr, peer, sizeof(eui64_t));
process_post(PROCESS_BROADCAST, ble_event_interface_added, NULL);
return &interfaces[i];
}
}
return NULL;
}
/*---------------------------------------------------------------------------*/
/**
* \brief Remove interface from the interface table.
* \param interface a pointer to interface
*/
static void
ble_mac_interface_delete(ble_mac_interface_t *interface)
{
memset(interface, 0, sizeof(ble_mac_interface_t));
process_post(PROCESS_BROADCAST, ble_event_interface_deleted, NULL);
}
/*---------------------------------------------------------------------------*/
/**
* \brief Callback registered with IPSP to receive asynchronous events from the module.
* \note This function is called from SoftDevice interrupt context.
*
* \param[in] p_handle Pointer to IPSP handle.
* \param[in] p_evt Pointer to specific event, generated by IPSP module.
*
* \return NRF_SUCCESS on success, otherwise NRF_ERROR_NO_MEM error.
*/
static uint32_t
ble_mac_ipsp_evt_handler_irq(ble_ipsp_handle_t *p_handle, ble_ipsp_evt_t *p_evt)
{
uint32_t retval = NRF_SUCCESS;
ble_mac_interface_t *p_instance = NULL;
p_instance = ble_mac_interface_lookup(p_handle);
if(p_handle) {
PRINTF("ble-mac: IPSP event [handle:%d CID 0x%04X]\n", p_handle->conn_handle, p_handle->cid);
}
switch(p_evt->evt_id) {
case BLE_IPSP_EVT_CHANNEL_CONNECTED: {
eui64_t peer_addr;
PRINTF("ble-mac: channel connected\n");
IPV6_EUI64_CREATE_FROM_EUI48(
peer_addr.identifier,
p_evt->evt_param->params.ch_conn_request.peer_addr.addr,
p_evt->evt_param->params.ch_conn_request.peer_addr.addr_type);
p_instance = ble_mac_interface_add(&peer_addr, p_handle);
if(p_instance != NULL) {
PRINTF("ble-mac: added new IPSP interface\n");
} else {
PRINTF("ble-mac: cannot add new interface. Table is full\n");
ble_ipsp_disconnect(p_handle);
}
break;
}
case BLE_IPSP_EVT_CHANNEL_DISCONNECTED: {
PRINTF("ble-mac: channel disconnected\n");
if(p_instance != NULL) {
PRINTF("ble-mac: removed IPSP interface\n");
ble_mac_interface_delete(p_instance);
}
break;
}
case BLE_IPSP_EVT_CHANNEL_DATA_RX: {
PRINTF("ble-mac: data received\n");
if(p_instance != NULL) {
if(busy_rx) {
PRINTF("ble-mac: packet dropped as input buffer is busy\n");
break;
}
if(p_evt->evt_param->params.ch_rx.len > PACKETBUF_SIZE) {
PRINTF("ble-mac: packet buffer is too small!\n");
break;
}
busy_rx = 1;
input_packet.len = p_evt->evt_param->params.ch_rx.len;
memcpy(input_packet.payload, p_evt->evt_param->params.ch_rx.p_data, input_packet.len);
memcpy(input_packet.src.identifier, p_instance->peer_addr.identifier, sizeof(eui64_t));
sd_ble_gap_rssi_get(p_handle->conn_handle, &input_packet.rssi);
process_poll(&ble_ipsp_process);
} else {
PRINTF("ble-mac: got data to unknown interface!\n");
}
break;
}
case BLE_IPSP_EVT_CHANNEL_DATA_TX_COMPLETE: {
PRINTF("ble-mac: data transmitted\n");
busy_tx = 0;
break;
}
}
return retval;
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(ble_ipsp_process, ev, data)
{
PROCESS_BEGIN();
while(1) {
PROCESS_WAIT_EVENT();
if(ev == PROCESS_EVENT_POLL) {
packetbuf_copyfrom(input_packet.payload, input_packet.len);
packetbuf_set_attr(PACKETBUF_ATTR_RSSI, input_packet.rssi);
packetbuf_set_addr(PACKETBUF_ADDR_SENDER, (const linkaddr_t *)input_packet.src.identifier);
packetbuf_set_addr(PACKETBUF_ADDR_RECEIVER, &linkaddr_node_addr);
busy_rx = 0;
NETSTACK_LLSEC.input();
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
/**
* \brief Lookup IPSP handle by peer address.
*
* \param addr a pointer to eui64 address.
* \retval a pointer to IPSP handle on success
* \retval NULL if an IPSP handle for given address haven't been found
*/
static ble_ipsp_handle_t *
find_handle(const linkaddr_t *addr)
{
int i;
for(i = 0; i < BLE_MAC_MAX_INTERFACE_NUM; i++) {
if(linkaddr_cmp((const linkaddr_t *)&interfaces[i].peer_addr, addr)) {
return &interfaces[i].handle;
}
}
return NULL;
}
/*---------------------------------------------------------------------------*/
/**
* \brief Send packet on a given IPSP handle.
*
* \param handle a pointer to IPSP handle.
* \return 1 on success, 0 otherwise
*/
static int
send_to_peer(ble_ipsp_handle_t *handle)
{
PRINTF("ble-mac: sending packet[GAP handle:%d CID:0x%04X]\n", handle->conn_handle, handle->cid);
return (ble_ipsp_send(handle, packetbuf_dataptr(), packetbuf_datalen()) == NRF_SUCCESS);
}
/*---------------------------------------------------------------------------*/
static void
send_packet(mac_callback_t sent, void *ptr)
{
int i;
const linkaddr_t *dest;
ble_ipsp_handle_t *handle;
int ret = 0;
mac_sent_cb = sent;
mac_sent_ptr = ptr;
dest = packetbuf_addr(PACKETBUF_ADDR_RECEIVER);
if(linkaddr_cmp(dest, &linkaddr_null)) {
for(i = 0; i < BLE_MAC_MAX_INTERFACE_NUM; i++) {
if(interfaces[i].handle.cid != 0 && interfaces[i].handle.conn_handle != 0) {
ret = send_to_peer(&interfaces[i].handle);
watchdog_periodic();
}
}
} else if((handle = find_handle(dest)) != NULL) {
ret = send_to_peer(handle);
} else {
PRINTF("ble-mac: no connection found for peer");
}
if(ret) {
busy_tx = 1;
while(busy_tx) {
watchdog_periodic();
sd_app_evt_wait();
}
mac_call_sent_callback(sent, ptr, MAC_TX_OK, 1);
} else {
mac_call_sent_callback(sent, ptr, MAC_TX_ERR, 1);
}
}
/*---------------------------------------------------------------------------*/
static int
on(void)
{
return 1;
}
/*---------------------------------------------------------------------------*/
static int
off(int keep_radio_on)
{
return 1;
}
/*---------------------------------------------------------------------------*/
static unsigned short
channel_check_interval(void)
{
return 0;
}
/*---------------------------------------------------------------------------*/
static void
init(void)
{
// Initialize IPSP service
uint32_t err_code;
ble_ipsp_init_t ipsp_init_params;
memset(&ipsp_init_params, 0, sizeof(ipsp_init_params));
ipsp_init_params.evt_handler = ble_mac_ipsp_evt_handler_irq;
err_code = ble_ipsp_init(&ipsp_init_params);
APP_ERROR_CHECK(err_code);
ble_event_interface_added = process_alloc_event();
ble_event_interface_deleted = process_alloc_event();
process_start(&ble_ipsp_process, NULL);
}
/*---------------------------------------------------------------------------*/
const struct mac_driver ble_ipsp_mac_driver = {
"nRF52 IPSP driver",
init,
send_packet,
NULL,
on,
off,
channel_check_interval,
};
/*---------------------------------------------------------------------------*/
/**
* @}
*/