Hello MManjrekar,
Unfortunately, there isn't a register that tells you the wakeup source. We only have a register that tells you the reset type that occurred. The example power mode switch provided in the SDK uses this register to determine the reset type.
As a workaround, you could try the following. Once the MCU is awake, you will need to initialize your 4 GPIO pins and read the state of all of them to determine which one was the wakeup source, if none of them is activated, it will mean that it was the RTC. The implication of this approach is that you will need to keep the GPIO activated until you determine the wakeup source, for example, if you are planning to use a switch on each GPIO, the user will need to keep pressing the switch until the MCU determines which GPIO was the wakeup source.
Have a great day,
Victor
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