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embedded: handle timers when system_time overruns

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This commit is contained in:
Matthias Ringwald 2017-01-13 18:00:38 +01:00
parent 26a1d27a3a
commit e86b2fec6e
1 changed files with 38 additions and 3 deletions
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41
platform/embedded/btstack_run_loop_embedded.c
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@ -117,11 +117,40 @@ static void btstack_run_loop_embedded_set_timer(btstack_timer_source_t *ts, uint
#endif
}
// under the assumption that a tick value is +/- 2^30 away from now, calculate the upper bits of the tick value
static int btstack_run_loop_embedded_reconstruct_higher_bits(uint32_t now, uint32_t ticks){
int32_t delta = ticks - now;
if (delta >= 0){
if (ticks >= now) {
return 0;
} else {
return 1;
}
} else {
if (ticks < now) {
return 0;
} else {
return -1;
}
}
}
/**
* Add timer to run_loop (keep list sorted)
*/
static void btstack_run_loop_embedded_add_timer(btstack_timer_source_t *ts){
#ifdef TIMER_SUPPORT
#ifdef HAVE_EMBEDDED_TICK
uint32_t now = system_ticks;
#endif
#ifdef HAVE_EMBEDDED_TIME_MS
uint32_t now = hal_time_ms();
#endif
uint32_t new_low = ts->timeout;
int new_high = btstack_run_loop_embedded_reconstruct_higher_bits(now, new_low);
btstack_linked_item_t *it;
for (it = (btstack_linked_item_t *) &timers; it->next ; it = it->next){
// don't add timer that's already in there
@ -129,7 +158,9 @@ static void btstack_run_loop_embedded_add_timer(btstack_timer_source_t *ts){
log_error( "btstack_run_loop_timer_add error: timer to add already in list!");
return;
}
if (ts->timeout < ((btstack_timer_source_t *) it->next)->timeout) {
uint32_t next_low = ((btstack_timer_source_t *) it->next)->timeout;
int next_high = btstack_run_loop_embedded_reconstruct_higher_bits(now, next_low);
if (new_high < next_high || ((new_high == next_high) && (new_low < next_low))){
break;
}
}
@ -185,17 +216,21 @@ void btstack_run_loop_embedded_execute_once(void) {
}
}
#ifdef TIMER_SUPPORT
#ifdef HAVE_EMBEDDED_TICK
uint32_t now = system_ticks;
#endif
#ifdef HAVE_EMBEDDED_TIME_MS
uint32_t now = hal_time_ms();
#endif
#ifdef TIMER_SUPPORT
// process timers
while (timers) {
btstack_timer_source_t *ts = (btstack_timer_source_t *) timers;
if (ts->timeout > now) break;
uint32_t timeout_low = ts->timeout;
int timeout_high = btstack_run_loop_embedded_reconstruct_higher_bits(now, timeout_low);
if (timeout_high > 0 || ((timeout_high == 0) && (timeout_low > now))) break;
btstack_run_loop_remove_timer(ts);
ts->process(ts);
}