wayne roberts / TimeoutAbs

Timeout driver for event at absolute time

Dependents:   demo_TimeoutAbs i2c_lora_slave

Timeout driver for generating event at absolute time, i.e. alarm at 12:00PM instead of alarm in 5 minutes.

This is the same concept as TIMER_ABSTIME in clock_nanosleep().

The purpose is to remove dependency on when attach() is called, so the event occurs at correct time regardless of any latency in calling attach().

This driver doesnt add any functionality over mbed-os library; it only skips the call to ticker_read_us() in Ticker::setup(), which just changes a relative time to absolute time.

example use here.

TimeoutAbs.cpp@1:ae6b29794806, 2018-12-07 (annotated)

Committer:
Wayne Roberts
Date:
Fri Dec 07 17:49:32 2018 -0800
Revision:
1:ae6b29794806
Parent:
0:900163d530ae 
ifdef for header multiple inclusion

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Wayne Roberts 0:900163d530ae 1
Wayne Roberts 0:900163d530ae 2 #include "TimeoutAbs.h"
Wayne Roberts 0:900163d530ae 3 #include "drivers/TimerEvent.h"
Wayne Roberts 0:900163d530ae 4 #include "platform/FunctionPointer.h"
Wayne Roberts 0:900163d530ae 5 #include "hal/ticker_api.h"
Wayne Roberts 0:900163d530ae 6 #include "platform/mbed_critical.h"
Wayne Roberts 0:900163d530ae 7
Wayne Roberts 0:900163d530ae 8 namespace mbed {
Wayne Roberts 0:900163d530ae 9
Wayne Roberts 0:900163d530ae 10 void TimeoutAbs::detach()
Wayne Roberts 0:900163d530ae 11 {
Wayne Roberts 0:900163d530ae 12 core_util_critical_section_enter();
Wayne Roberts 0:900163d530ae 13 remove();
Wayne Roberts 0:900163d530ae 14 // unlocked only if we were attached (we locked it) and this is not low power ticker
Wayne Roberts 0:900163d530ae 15 if (_function && _lock_deepsleep) {
Wayne Roberts 0:900163d530ae 16 sleep_manager_unlock_deep_sleep();
Wayne Roberts 0:900163d530ae 17 }
Wayne Roberts 0:900163d530ae 18 _function = 0;
Wayne Roberts 0:900163d530ae 19 core_util_critical_section_exit();
Wayne Roberts 0:900163d530ae 20 }
Wayne Roberts 0:900163d530ae 21
Wayne Roberts 0:900163d530ae 22 void TimeoutAbs::abs_setup(us_timestamp_t t)
Wayne Roberts 0:900163d530ae 23 {
Wayne Roberts 0:900163d530ae 24 core_util_critical_section_enter();
Wayne Roberts 0:900163d530ae 25 remove();
Wayne Roberts 0:900163d530ae 26 insert_absolute(t);
Wayne Roberts 0:900163d530ae 27 core_util_critical_section_exit();
Wayne Roberts 0:900163d530ae 28 }
Wayne Roberts 0:900163d530ae 29
Wayne Roberts 0:900163d530ae 30 void TimeoutAbs::handler()
Wayne Roberts 0:900163d530ae 31 {
Wayne Roberts 0:900163d530ae 32 Callback<void()> local = _function;
Wayne Roberts 0:900163d530ae 33 detach();
Wayne Roberts 0:900163d530ae 34 local.call();
Wayne Roberts 0:900163d530ae 35 }
Wayne Roberts 0:900163d530ae 36
Wayne Roberts 0:900163d530ae 37 } // namespace mbed