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107 commits

Author SHA1 Message Date
adamdunkels 1a13d25d33 Revised version of the X-MAC implementation that uses a ctimer instead 
of an rtimer for the periodic radio duty cycling. The benefit of this
implementation is that it leaves an rtimer free for user tasks. The
drawback is a slightly higher idle power consumption. This new version
is based on the current rtimer-based X-MAC.
 2010-01-31 18:44:23 +00:00
adamdunkels e4168db633 Bugfix: deallocate queuebuf only if there was no collision 2010-01-31 13:55:36 +00:00
adamdunkels 2ae7ed827c Increase the default X-MAC channel check rate to 4 Hz instead of 2 Hz 2010-01-28 13:40:47 +00:00
adamdunkels 8430dab039 Typecast to fix nightly build problem 2010-01-27 07:36:31 +00:00
adamdunkels 4f3e8d565c Added a simple CSMA (Carrier Sense Multiple Access) mechanism that 
works on top of an underlying duty cycling mechanism. The CSMA layer
retransmits packets that could not be sent because of a collision was
detected.
 2010-01-25 11:46:44 +00:00
adamdunkels 7ad93e5d18 Added a field to the struct mac interface: 
channel_check_interval(). This function returns the interval by which
the duty cycling mechanism checks the radio channel for activity. It
is used by higher layer mechanisms to determine suitable timeouts for
retransmissions.
 2010-01-25 11:43:32 +00:00
adamdunkels 743e93e650 Do not remove encounters - there is no need to, as they are only an optimization 2010-01-14 20:14:03 +00:00
adamdunkels 2f105e933a Variable xmac_is_on was used both in interrupt and non-interrupt contexts and needs to be volatile 2009-12-06 23:29:38 +00:00
adamdunkels 53457eb1f0 Fixed compilation warning 2009-12-06 17:10:54 +00:00
adamdunkels 8bcc838d8a Bugfix: don't set the 'we are sending' flag until we are actually sending 2009-12-06 17:05:45 +00:00
adamdunkels 6897270289 Bugfix to the Contiki LPP encounter timing code: encounters are now 
properly timed.
 2009-12-06 13:18:32 +00:00
adamdunkels 822149f943 Significant improvements to the Contiki X-MAC: 
* the code is simplified, particularly the duty cycling logic
* old unused code has been removed
* Contiki X-MAC now listens before sending a strobe to avoid MAC-level
  collisions
* broadcasts are sent directly, without strobes, reducing the power
  consumption of receivers
* turn off radio for 1 ms between sending a strobe and expecting the
  strobe ack
 2009-12-06 13:16:59 +00:00
adamdunkels cef2e65c9b Added an error type for signalling a MAC-layer collision 2009-12-05 21:49:51 +00:00
adamdunkels 4a1a823a49 Code style fix 2009-12-05 13:29:41 +00:00
fros4943 a1b4597b95 fixed announcement compilation error 2009-11-27 14:27:50 +00:00
adamdunkels aeefa75304 Fixed alignment problems in announcement packet creation 2009-11-27 12:49:27 +00:00
fros4943 0034fd7bca generic return values for sent packet 2009-11-13 10:09:02 +00:00
fros4943 26bb5ecd21 added radio and MAC generic return values to allow applications finding out whether the packet was transmitted 2009-11-13 08:59:22 +00:00
adamdunkels 70fc23ac7e Enable stream mode by default, remove LED debug mode 2009-11-04 16:02:45 +00:00
adamdunkels 5aab2eb77d A simple addition with significant performance implications: 
sicslowpan tags TCP packets with the PACKETBUF_ATTR_PACKET_TYPE_STREAM
flag, which makes the underlying power-saving MAC layer keep the radio
on for some time after transmitting the packet. This allows reply
packets to be processed directly, significantly increasing TCP latency
and throughput.
 2009-11-02 11:58:56 +00:00
nifi 223fa1c8e5 added missing include 2009-10-20 07:42:03 +00:00
adamdunkels 7cdfbca973 Alignment problems with announcements fixed 2009-10-19 21:27:02 +00:00
adamdunkels 9ec57d61ad Added MAC layer framing support to X-MAC so that packets now are standard 802.15.4 frames 2009-10-19 20:53:56 +00:00
adamdunkels 4de1816e36 Added a new module called "framer" that creates MAC level frames to 
the packetbuf from packet attributes. Two framer modules are included,
one that creates 802.15.4 frame headers, and one that creates a
minimal "nullmac"-style header that only contains the link-local
addresses.
 2009-10-19 18:30:03 +00:00
nifi ae226c5917 * Set sender and receiver packet attributes on incoming packets 
* Added link layer destination check
 2009-10-19 11:25:54 +00:00
adamdunkels 10c873018d Ensure that DEFAULT_PERIOD is != 0, to avoid a modulo with 0 2009-10-19 06:39:29 +00:00
adamdunkels 9d26bd663e A new optimization to X-MAC: senders now keep track of when neighbors 
last were known to be awake. When sending a packet, a sender does not
start to send strobes until the neighbor is expected to be awake. This
reduces power consumption for senders and decreases the contention in
the network as there are less packets in the air. Additionally, the
ACK optimization was improved so that data/ack exchanges now are
more efficient.
 2009-10-18 13:19:25 +00:00
nifi 0ad51b8dcc Moved the link layer destination check to sicslowmac 2009-09-18 16:37:17 +00:00
adamdunkels 2181e90f69 Added the possibility to switch lpp off. Fixed sdcc compiler issue 2009-09-09 21:09:23 +00:00
adamdunkels 1cafbc6002 sdcc compiler issue fix: compound assignments are not supported, so we use memcpy() instead 2009-09-09 21:08:46 +00:00
nvt-se 4d21a3e203 Don't assume that radio->send turns on the radio automatically. 2009-09-04 10:59:30 +00:00
adamdunkels 522f991f14 Set sender and receiver packet attributes on incoming packets: patch by Gidon Ernst 2009-08-20 18:59:17 +00:00
nifi 912aba7280 added init function in MAC driver for easier configuration 2009-06-22 11:14:11 +00:00
nifi f39d2bd4c6 Fixed link panid for broadcasts to be standard compliant. Ignore packets addressed to other non-broadcast panids. 2009-05-26 12:08:29 +00:00
adamdunkels fe5a1f1068 Added an optimization option that avoids multiple simultaneous broadcasts from neighbors: when a broadcast is to be sent, a sender does not send until it knows that no other nodes are broadcasting. 2009-05-10 21:09:05 +00:00
adamdunkels 0adceb63b4 Code cleanup; made encounter optimization explicit; added optimization for adaptive off-time, but it currently seems to work bad with broadcasts 2009-05-06 15:06:38 +00:00
adamdunkels 9fff85757d Code cleanup; made strobe transmission time longer again (seems to work better in cooja?) 2009-05-06 15:05:28 +00:00
adamdunkels cc44e89415 Reduced default strobe time, which seems to work well. Avoid running the interrupt if the power-save feature is turned off (fixes problems with serial data reception on a gateway mote) 2009-04-29 11:42:13 +00:00
adamdunkels 81ef83b856 Added option to wait randomly before sending a packet. A few code cleanups. Avoid switching radio off when sending a packet with end-to-end acks, because an ACK may arrive shortly after the transmission. 2009-04-28 14:00:53 +00:00
nifi 84b38de494 removed bitfields for compatibility with cc65 2009-04-09 21:54:09 +00:00
nvt-se 03cd533712 made LISTEN_TIME and OFF_TIME configurable. 2009-04-07 11:29:08 +00:00
adamdunkels 5e456aea7d Added optimization for sending ACKs immediately. Turned optimizations on. Increased listening time to 1/64 s again due to problems with broadcasts with the 1/128 s setting 2009-04-06 22:50:35 +00:00
nifi 9f2ff48fda added 802.15.4 frame packeter 2009-04-06 13:19:03 +00:00
adamdunkels ed1e945e66 Added guard code so that OFF_TIME is never zero 2009-04-03 20:08:05 +00:00
adamdunkels 8dbd2b2337 Significant power consumption optimization: LPP now keeps track of encounters with neighbors and uses this information to keep the radio switched off longer. 2009-04-03 19:59:22 +00:00
adamdunkels 1d86b01bfb Made optimizations explicit (and configurable). Added missing initialization of dutycycle protothread. Reduced default listen time and off time. 2009-04-03 11:45:06 +00:00
adamdunkels 04101aae36 Fixed alignment problem on the MSP430, where the LPP header may be misaligned 2009-03-31 17:39:54 +00:00
nvt-se e2cc8b2a3e send all queued packet once we have the chance. 2009-03-31 14:44:13 +00:00
nvt-se 1d47e2a8da send immediate probes only if the packet is directed to us. 
sleep for OFF_TIME if the queue is empty.

restrict double packet lifetime timeouts to unicast packets.

stop ctimer in remove_queued_packet in case the function is not called
via the ctimer callback. it could overwrite a valid packet otherwise.
 2009-03-31 14:11:25 +00:00
nvt-se dd082f7fcf improvements to lpp based on code from Adam and discussions with Thiemo. 
* queue multiple packets
* send a strobe back immediately after receiving a data packet
* double the packet lifetime to allow for a missed probe
 2009-03-31 12:47:00 +00:00