Could you mention what sleep mode does each case use?

[alexceltare2]

STM literature mentions the following cases:
(++) Run. (normal operation)
(++) Sleep.
(++) Stop 0.
(++) Stop 1.
(++) Stop 2.
(++) Stop 3.
(++) Standby.
(++) Shutdown.

But the LowPower Library has:

• Idle
• Sleep
• DeepSleep
• Shutdown

How do these cases tie up to the official STM cases?

[fpistm]

The STM32LowPower API were developped based on https://github.com/arduino-libraries/ArduinoLowPower API.
So it try to map to the most appropriate mode depending of the STM32 series and available mode.

https://github.com/stm32duino/STM32LowPower/tree/main?tab=readme-ov-file#hardware-state

You could check the code to find for the series you used the STM32 LP mode called.

https://github.com/stm32duino/STM32LowPower/blob/main/src/STM32LowPower.cpp

[alexceltare2]

OK, so according to my research, the following modes are used:
.idle(); //same as HAL SLEEP
.sleep(); //same as HAL SLEEP
.deepSleep(); //uses HAL STOP2
.shutdown(); //uses HAL SHUTDOWN