/*!
\file readme.txt
\brief description of the deepsleep wakeup through exti demo
\version 2021-10-30, V1.0.0, firmware for GD32W51x
*/
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*/
This example is based on the GD32W515P-EVAL-V1.0 board, it shows pmu how to enter deepsleep
mode and wakeup it. After startup, mcu will enter deepsleep mode after 2 seconds, and led stop
flashing. When you press TAMPER_WAKEUP key to generate an exti interrupt, mcu will be wakeuped
from deepsleep mode, led sparks again. But the led sparks slower, because at this time IRC16M
is the system clock.