antmerlino commented on a change in pull request #1380:
URL: https://github.com/apache/incubator-nuttx/pull/1380#discussion_r451206835
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File path: arch/arm/src/stm32f7/stm32_tickless.c
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@@ -988,22 +988,31 @@ int up_timer_start(FAR const struct timespec *ts)
}
#endif
+#ifdef CONFIG_SCHED_TICKLESS_ALARM
int up_alarm_start(FAR const struct timespec *ts)
{
uint64_t tm = ((uint64_t)ts->tv_sec * NSEC_PER_SEC + ts->tv_nsec) /
NSEC_PER_TICK;
- uint64_t counter = ((uint64_t)g_tickless.overflow << 32) |
- STM32_TIM_GETCOUNTER(g_tickless.tch);
-
- g_tickless.last_alrm = tm;
+ irqstate_t flags;
- int32_t diff = tm / NSEC_PER_TICK + counter;
+ flags = enter_critical_section();
STM32_TIM_SETCOMPARE(g_tickless.tch, CONFIG_STM32F7_TICKLESS_CHANNEL, tm);
stm32_tickless_ackint(g_tickless.channel);
stm32_tickless_enableint(CONFIG_STM32F7_TICKLESS_CHANNEL);
+ g_tickless.pending = true;
+
+ uint64_t counter = ((uint64_t)g_tickless.overflow << 32) |
+ STM32_TIM_GETCOUNTER(g_tickless.tch);
+
+ if (counter > tm)
+ {
+ stm32_interval_handler();
Review comment:
@gregory-nutt I think the problem here is a little different.
The issue here is that I WANT the timer to expire. The core issue that I'm
trying to solve is that when up_alarm_start is called with a timestamp that has
already passed, there is an assumption that the alarm is going to fire. But if
the time has already passed by the time we set the compare register, I must
force the expiration so that the work_queue can immediately process that event.
So I need a safe way of expiring the timer, from within, the up_alarm_start
call, such that the work immediately just keeps moving. Am I making any sense?
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