/*!
\file readme.txt
\brief description of wakeup from deepsleep
\version 2021-10-30, V1.0.0, firmware for GD32W51x
*/
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This demo is based on the GD32W515P-EVAL-V1.0, it shows how to wakeup pmu from deepsleep
mode by I2C address match. Select the IRC16M as the clock of I2C0. Press key Tamper to
enter deepsleep mode, led stop flashing. When the I2C received address that matches
with its address, mcu will be wakeuped from deepsleep mode, the transfer goes on
normally and led sparks again. But the led sparks slower, because at this time IRC16M
is the system clock.
In this demo, I2C0 is operated as slave receiver, and the SCL line and SDA line of
I2C0 interface are controlled by the I/O pin PA15 and PB7 respectively.
PA15 and PB7 should connect with a pull-up resistor.
