/*!
    \file    readme.txt
    \brief   description of wakeup from deepsleep

    \version 2026-02-02, V2.4.0, firmware for GD32L23x, add support for GD32L235
*/

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*/

  This demo is based on the GD32L233R-EVAL-V1.1/GD32L235R-EVAL-V1.0, it shows how to 
wakeup pmu from deepsleep mode by I2C address match. Select the IRC16M as the clock 
of I2C1. Press key Wakeup 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, I2C1 is operated as slave receiver, and the SCL line and SDA line of 
I2C1 interface are controlled by the I/O pin PB10 and PB11 respectively. 
  On GD32L235R-EVAL-V1.0 board, the JP7 and JP8 must be fitted for I2C, the JP23 
and JP24 must be fitted for USART, the JP18 must be fitted for LED.
