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Allow sleepings fractions of a second #23

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a8356bc
Support sleeping fractions of seconds
angelnu May 24, 2020
af64eb7
Remove limitation to full seconds in delays
angelnu May 24, 2020
c5bb815
Not change version
angelnu May 26, 2020
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10 changes: 5 additions & 5 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -3,23 +3,23 @@ Arduino library to support STM32 Low Power.

## Requirement
* [Arduino_Core_STM32](https://github.com/stm32duino/Arduino_Core_STM32) version >= 1.3.0
* [STM32RTC](https://github.com/stm32duino/STM32RTC)
* [STM32RTC](https://github.com/stm32duino/STM32RTC) version >= 1.0.4

## API

* **`void begin()`**: configure the Low Power

* **`void idle(uint32_t millis)`**: enter in idle mode
**param** millis (optional): number of milliseconds before to exit the mode. At least 1000 ms. The RTC is used in alarm mode to wakeup the chip in millis milliseconds.
**param** millis (optional): number of milliseconds before to exit the mode. The RTC is used in alarm mode to wakeup the chip in millis milliseconds.

* **`void sleep(uint32_t millis)`**: enter in sleep mode
**param** millis (optional): number of milliseconds before to exit the mode. At least 1000 ms. The RTC is used in alarm mode to wakeup the chip in millis milliseconds.
**param** millis (optional): number of milliseconds before to exit the mode. he RTC is used in alarm mode to wakeup the chip in millis milliseconds.

* **`void deepSleep(uint32_t millis)`**: enter in deepSleep mode
**param** millis (optional): number of milliseconds before to exit the mode. At least 1000 ms. The RTC is used in alarm mode to wakeup the chip in millis milliseconds.
**param** millis (optional): number of milliseconds before to exit the mode. The RTC is used in alarm mode to wakeup the chip in millis milliseconds.

* **`void shutdown(uint32_t millis)`**: enter in shutdown mode
**param** millis (optional): number of milliseconds before to exit the mode. At least 1000 ms. The RTC is used in alarm mode to wakeup the board in millis milliseconds.
**param** millis (optional): number of milliseconds before to exit the mode. The RTC is used in alarm mode to wakeup the board in millis milliseconds.

* **`void attachInterruptWakeup(uint32_t pin, voidFuncPtrVoid callback, uint32_t mode)`**: Enable GPIO pin in interrupt mode. If the pin is a wakeup pin, it is configured as wakeup source (see board documentation).
**param** pin: pin number
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2 changes: 1 addition & 1 deletion library.properties
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@@ -1,5 +1,5 @@
name=STM32duino Low Power
version=1.0.3
version=1.0.4
author=Wi6Labs
maintainer=stm32duino
sentence=Power save primitives features for STM32 boards
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18 changes: 12 additions & 6 deletions src/STM32LowPower.cpp
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Expand Up @@ -169,13 +169,14 @@ void STM32LowPower::enableWakeupFrom(STM32RTC *rtc, voidFuncPtr callback, void *

/**
* @brief Configure the RTC alarm
* @param millis: time of the alarm in milliseconds. At least 1000ms.
* @param millis: time of the alarm in milliseconds.
* @param lp_mode: low power mode targeted.
* @retval None
*/
void STM32LowPower::programRtcWakeUp(uint32_t millis, LP_Mode lp_mode)
{
int epoc;
uint32_t epoc_ms;
uint32_t sec;
STM32RTC &rtc = STM32RTC::getInstance();
STM32RTC::Source_Clock clkSrc = rtc.getClockSource();
Expand Down Expand Up @@ -204,12 +205,17 @@ void STM32LowPower::programRtcWakeUp(uint32_t millis, LP_Mode lp_mode)
if (millis > 0) {
// Convert millisecond to second
sec = millis / 1000;
// Minimum is 1 second
if (sec == 0) {
sec = 1;
millis = millis % 1000;

epoc = rtc.getEpoch(&epoc_ms);

//Update epoch_ms - might need to add a second to epoch
epoc_ms += millis;
if (epoc_ms >= 1000) {
sec ++;
epoc_ms -= 1000;
}

epoc = rtc.getEpoch();
rtc.setAlarmEpoch(epoc + sec);
rtc.setAlarmEpoch(epoc + sec, STM32RTC::MATCH_DHHMMSS, epoc_ms);
}
}