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equeue: add config option to use different timer classes #5328

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Merged
merged 3 commits into from
Nov 9, 2017
Merged

equeue: add config option to use different timer classes #5328

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eacc276
equeue: added config option which tells equeue_mbed.cpp if it shall u…
MikeDK Oct 17, 2017
6406ab0
equeue: added help text for new config option use-lowpower-timer-ticker
MikeDK Oct 18, 2017
23f2199
equeue: some refactoring to meet coding rules
MikeDK Oct 30, 2017
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29 changes: 19 additions & 10 deletions events/equeue/equeue_mbed.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -23,27 +23,36 @@
#include <stdbool.h>
#include "mbed.h"

#if MBED_CONF_EVENTS_USE_LOWPOWER_TIMER_TICKER
#define ALIAS_TIMER LowPowerTimer
#define ALIAS_TICKER LowPowerTicker
#define ALIAS_TIMEOUT LowPowerTimeout
#else
#define ALIAS_TIMER Timer
#define ALIAS_TICKER Ticker
#define ALIAS_TIMEOUT Timeout
#endif

// Ticker operations
static bool equeue_tick_inited = false;
static volatile unsigned equeue_minutes = 0;
static unsigned equeue_timer[
(sizeof(Timer)+sizeof(unsigned)-1)/sizeof(unsigned)];
(sizeof(ALIAS_TIMER)+sizeof(unsigned)-1)/sizeof(unsigned)];
static unsigned equeue_ticker[
(sizeof(Ticker)+sizeof(unsigned)-1)/sizeof(unsigned)];
(sizeof(ALIAS_TICKER)+sizeof(unsigned)-1)/sizeof(unsigned)];

static void equeue_tick_update() {
equeue_minutes += reinterpret_cast<Timer*>(equeue_timer)->read_ms();
reinterpret_cast<Timer*>(equeue_timer)->reset();
equeue_minutes += reinterpret_cast<ALIAS_TIMER*>(equeue_timer)->read_ms();
reinterpret_cast<ALIAS_TIMER*>(equeue_timer)->reset();
}

static void equeue_tick_init() {
MBED_STATIC_ASSERT(sizeof(equeue_timer) >= sizeof(Timer),
MBED_STATIC_ASSERT(sizeof(equeue_timer) >= sizeof(ALIAS_TIMER),
"The equeue_timer buffer must fit the class Timer");
MBED_STATIC_ASSERT(sizeof(equeue_ticker) >= sizeof(Ticker),
MBED_STATIC_ASSERT(sizeof(equeue_ticker) >= sizeof(ALIAS_TICKER),
"The equeue_ticker buffer must fit the class Ticker");
Timer *timer = new (equeue_timer) Timer;
Ticker *ticker = new (equeue_ticker) Ticker;
ALIAS_TIMER *timer = new (equeue_timer) ALIAS_TIMER;
ALIAS_TICKER *ticker = new (equeue_ticker) ALIAS_TICKER;

equeue_minutes = 0;
timer->start();
Expand All @@ -62,7 +71,7 @@ unsigned equeue_tick() {

do {
minutes = equeue_minutes;
ms = reinterpret_cast<Timer*>(equeue_timer)->read_ms();
ms = reinterpret_cast<ALIAS_TIMER*>(equeue_timer)->read_ms();
} while (minutes != equeue_minutes);

return minutes + ms;
Expand Down Expand Up @@ -132,7 +141,7 @@ static void equeue_sema_timeout(equeue_sema_t *s) {

bool equeue_sema_wait(equeue_sema_t *s, int ms) {
int signal = 0;
Timeout timeout;
ALIAS_TIMEOUT timeout;
if (ms == 0) {
return false;
} else if (ms > 0) {
Expand Down
4 changes: 4 additions & 0 deletions events/mbed_lib.json
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,10 @@
"shared-highprio-eventsize": {
"help": "Event buffer size (bytes) for shared high-priority event queue",
"value": 256
},
"use-lowpower-timer-ticker": {
"help": "Enable use of low power timer and ticker classes. May reduce the accuracy of the event queue.",
"value": 0
}
}
}