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Return error in class deepSleep() when max sleeptime is exceeded #4936

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Return error in class deepSleep() when max sleeptime is exceeded #4936

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37b8fa1
Check max sleeptime in class deepSleep()
Marc-Vreeburg Jul 18, 2018
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Update Esp.h
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7 changes: 7 additions & 0 deletions cores/esp8266/Esp.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -109,6 +109,13 @@ extern "C" void esp_yield();

void EspClass::deepSleep(uint64_t time_us, WakeMode mode)
{
if (time_us > deepSleepMax()) // we need to prevent the esp8266 from not waking up from deepsleep
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Hate to dogpile here, but if you do find out that deepSleepMax() doesn't really work and need to derate by 5% or whatever, please use that # to compare and not deepSleepMax() in this if condition. Otherwise someone will pass in, say, deepSleepMax() - 1 which won't work but which won't be caught by this check.

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Would it also be wise to increasingly loop the whole function until users's time_us is reached ?

{
time_us = (deepSleepMax() - (round(deepSleepMax() * 5 / 100))); // 5% correction because of inaccurate timekeeping by the esp8266
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@earlephilhower earlephilhower Jul 26, 2018 •
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No need for round() here. You're doing integer division already, so this takes the integer division result, promotes it to a double, then promotes deepSleepMax() to a double, subtracts them as doubles, then truncates it all back to an integer. A shorter way which won't cause a program to include the whole floating point libs (if not being included already):
time_us = (deepSleepMax() * 95L) / 100L;
or if time_us can be > 2^24 (so the *95 but could overflow)
time_us = deepSleepMax() - (deepSleepMax() / 20);

I bring this up because there was much howling of pain when we included floating point support in printf with the latest release, as some folks binaries ended up being just a hair too big for OTA...

#ifdef DEBUG_SERIAL
DEBUG_SERIAL.println("Warning: max sleeptime exceeded; sleeptime has been adjusted to max possible sleeptime!");
#endif
}
system_deep_sleep_set_option(static_cast<int>(mode));
system_deep_sleep(time_us);
esp_yield();
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