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Improve RTOS behavior with deep sleep 

Only deep sleep when the wakeup time is more than
MBED_CONF_TARGET_DEEP_SLEEP_LATENCY ms in the future.
This ensures that RTOS events are handled at the correct time. Note -
when deep sleep is allow interrupt latency may still be as high as
10ms.
pull/8223/head
Russ Butler 2018-09-21 16:53:42 -05:00
parent b18c819837
commit 50316d00bd
2 changed files with 16 additions and 0 deletions
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12
rtos/TARGET_CORTEX/mbed_rtx_idle.cpp
View File

@ -90,6 +90,13 @@ uint32_t OS_Tick_GetInterval (void) {
static void default_idle_hook(void)
{
uint32_t ticks_to_sleep = osKernelSuspend();
const bool block_deep_sleep = ticks_to_sleep <= MBED_CONF_TARGET_DEEP_SLEEP_LATENCY;
if (block_deep_sleep) {
sleep_manager_lock_deep_sleep();
} else {
ticks_to_sleep -= MBED_CONF_TARGET_DEEP_SLEEP_LATENCY;
}
os_timer->suspend(ticks_to_sleep);
bool event_pending = false;
@ -106,6 +113,11 @@ static void default_idle_hook(void)
// Ensure interrupts get a chance to fire
__ISB();
}
if (block_deep_sleep) {
sleep_manager_unlock_deep_sleep();
}
osKernelResume(os_timer->resume());
}

4
targets/targets.json
View File

@ -21,6 +21,10 @@
"help": "Default network interface type. Typical options: null, ETHERNET, WIFI, CELLULAR, MESH",
"value": null
},
"deep-sleep-latency": {
"help": "Time in ms required to go to and wake up from deep sleep (max 10)",
"value": 0
},
"boot-stack-size": {
"help": "Define the boot stack size in bytes. This value must be a multiple of 8",
"value": "0x1000"