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Changed the code so that the rtimer is only set from the rtimer (interrupt) code, and not from the non-rtimer code. Removed unused code that was supposed to turn the radio off when a packet for another node was heard (but which didn't really work anyway). Changed default on time to 1/100 seconds, and off time to 1/2 seconds

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This commit is contained in:
adamdunkels 2008-01-14 09:26:42 +00:00
parent 28eaf5ee40
commit bd125aaac6
1 changed files with 22 additions and 67 deletions
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89
core/net/mac/xmac.c
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@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: xmac.c,v 1.12 2007/12/23 14:56:54 oliverschmidt Exp $
* $Id: xmac.c,v 1.13 2008/01/14 09:26:42 adamdunkels Exp $
*/
/**
@ -73,18 +73,20 @@ struct xmac_hdr {
#ifdef XMAC_CONF_ON_TIME
#define DEFAULT_ON_TIME (XMAC_CONF_ON_TIME)
#else
#define DEFAULT_ON_TIME (RTIMER_ARCH_SECOND / 50)
#define DEFAULT_ON_TIME (RTIMER_ARCH_SECOND / 100)
#endif
#ifdef XMAC_CONF_OFF_TIME
#define DEFAULT_OFF_TIME (XMAC_CONF_OFF_TIME)
#else
#define DEFAULT_OFF_TIME ((RTIMER_ARCH_SECOND / 5) - DEFAULT_ON_TIME)
#define DEFAULT_OFF_TIME ((RTIMER_ARCH_SECOND / 2) - DEFAULT_ON_TIME)
#endif
#define DEFAULT_STROBE_WAIT_TIME (DEFAULT_ON_TIME) / 2
struct xmac_config xmac_config = {
DEFAULT_ON_TIME, DEFAULT_OFF_TIME,
DEFAULT_ON_TIME,
DEFAULT_OFF_TIME,
DEFAULT_ON_TIME + DEFAULT_OFF_TIME,
DEFAULT_STROBE_WAIT_TIME
};
@ -99,7 +101,6 @@ static volatile unsigned char should_be_awake = 0;
static volatile unsigned char someone_is_sending = 0;
static volatile unsigned char we_are_sending = 0;
static volatile unsigned char radio_is_on = 0;
static volatile unsigned char long_off = 0;
static const struct radio_driver *radio;
@ -107,6 +108,8 @@ static const struct radio_driver *radio;
#undef LEDS_OFF
#undef LEDS_TOGGLE
#define BB_SET(x,y)
#define BB_INC(x,y)
/* #define BB_SET(x,y) bb_set(x,y) */
@ -141,14 +144,11 @@ powercycle(struct rtimer *t, void *ptr)
{
int r;
/* printf("%d\n", pt.lc);*/
PT_BEGIN(&pt);
while(1) {
if(we_are_sending) {
PRINTF("xmac: we are sending 1, stopping timer\n");
PT_YIELD(&pt);
}
/* Only wait for some cycles to pass for someone to start sending */
if(someone_is_sending > 0) {
someone_is_sending--;
@ -156,11 +156,11 @@ powercycle(struct rtimer *t, void *ptr)
if(xmac_config.off_time > 0) {
if(should_be_awake == 0) {
if(xmac_is_on) {
if(xmac_is_on && we_are_sending == 0) {
radio->off();
LEDS_OFF(LEDS_RED);
radio_is_on = 0;
}
LEDS_OFF(LEDS_RED);
radio_is_on = 0;
} else {
should_be_awake++;
if(should_be_awake > 2) {
@ -175,17 +175,12 @@ powercycle(struct rtimer *t, void *ptr)
PT_YIELD(&pt);
}
if(we_are_sending) {
PRINTF("xmac: we are sending 1, stopping timer\n");
PT_YIELD(&pt);
}
if(radio_is_on == 0) {
if(xmac_is_on) {
if(xmac_is_on && we_are_sending == 0 && should_be_awake == 0) {
radio->on();
LEDS_ON(LEDS_RED);
radio_is_on = 1;
}
LEDS_ON(LEDS_RED);
radio_is_on = 1;
}
r = rtimer_set(t, RTIMER_TIME(t) + xmac_config.on_time, 1,
(void (*)(struct rtimer *, void *))powercycle, ptr);
@ -194,31 +189,6 @@ powercycle(struct rtimer *t, void *ptr)
}
PT_YIELD(&pt);
if(we_are_sending) {
PRINTF("xmac: we are sending 2, stopping timer\n");
PT_YIELD(&pt);
}
if(long_off) {
if(xmac_config.off_time > 0) {
/* XXX should wait for a complete packet that is not destined to
us to swisch past us. */
if(xmac_is_on) {
radio->off();
}
LEDS_OFF(LEDS_RED);
radio_is_on = 0;
if(rtimer_set(t, RTIMER_TIME(t) + xmac_config.off_time, 1,
(void (*)(struct rtimer *, void *))powercycle, ptr)) {
PRINTF("xmac: could not set long off rtimer\n");
}
}
long_off = 0;
someone_is_sending = 0;
}
}
PT_END(&pt);
@ -257,9 +227,6 @@ send_packet(void)
#endif
rimebuf_compact();
/* should_be_awake = 1;
while(!radio_is_on) {}*/
t0 = RTIMER_NOW();
strobes = 0;
@ -302,7 +269,6 @@ send_packet(void)
msg.sender.u8[0],msg.sender.u8[1],
msg.receiver.u8[0],msg.receiver.u8[1],
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
/* if(rimeaddr_cmp(&msg.receiver, &rimeaddr_node_addr)) { */
if(rimeaddr_cmp(&msg.sender, &rimeaddr_node_addr) &&
rimeaddr_cmp(&msg.receiver, &rimeaddr_node_addr)) {
@ -311,14 +277,6 @@ send_packet(void)
got_ack = 1;
break;
/* } else if(rimeaddr_cmp(&msg.sender, &hdr->receiver)) { */
/* /\* We did not get an ACK from the receiver, but the receiver */
/* is active so we can send the packet after a short random */
/* duration. *\/ */
/* clock_delay(random_rand() & 0x1ff); */
/* got_ack = 1; */
/* break; */
} else {
/* RIMESTATS_ADD(sendingdrop);*/
}
@ -349,12 +307,6 @@ send_packet(void)
we_are_sending = 0;
LEDS_OFF(LEDS_GREEN);
PT_INIT(&pt);
if((len = rtimer_set(&rt, RTIMER_NOW() + xmac_config.on_time, 1,
(void (*)(struct rtimer *, void *))powercycle, NULL)) != 0) {
PRINTF("xmac: could not set rtimer after send (%d)\n", len);
}
/* we_are_sending = 0; */
return 1;
}
@ -413,6 +365,8 @@ read_packet(void)
rimebuf_hdrreduce(sizeof(struct xmac_hdr));
if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_node_addr)) {
should_be_awake = 1;
radio->on();
radio_is_on = 1;
PRINTF("xmac: for us\n");
/* Only send strobe ack if the packet itself is not a strobe ack
@ -423,7 +377,7 @@ read_packet(void)
PRINTF("xmac: got sender %d.%d receiver %d.%d\n",
hdr->sender.u8[0],hdr->sender.u8[1],
hdr->receiver.u8[0],hdr->receiver.u8[1]);
while(!radio_is_on) {}
/* while(!radio_is_on) { printf(".");}*/
{
struct xmac_hdr msg;
@ -446,14 +400,15 @@ read_packet(void)
} else {
/* Go back to sleep. XXX should not turn on the radio again
until this packet has passed. */
radio->off();
radio_is_on = 0;
should_be_awake = 0;
long_off = 1;
/* long_off = 1;*/
/* XXX set timer to turn someone_is_sending off again and send queued packet. */
/* PRINTF("xmac: not for us\n");*/
}
if(rimebuf_totlen() > 0) {
/* We have received the final packet, so we can go back to being
asleep. */
someone_is_sending = 0;