Blink with power saving for Arduino and LGT8F328x

PowerBlink.ino

/*******************************************************************************
 * Classical Blink with power saving (c)2024 aleksandr.ru                      *
 * This should work both in Arduino and LGT8F328x                              *
 * @see https://github.com/dbuezas/lgt8fx/issues/155                           *
 *******************************************************************************/

#include <PMU.h>

//#define DEBUG 115200

void setup()
{
    pinMode(LED_BUILTIN, OUTPUT);
    pinMode(A0, INPUT);
    #ifdef DEBUG
    Serial.begin(DEBUG);
    Serial.println("Setup"); delay(100);
    #endif
}

void loop() 
{
    #ifdef DEBUG
    Serial.println("Working"); delay(100);
    #endif
    
    digitalWrite(LED_BUILTIN, HIGH);
    delay(2000);
    
    digitalWrite(LED_BUILTIN, LOW);

    #ifdef DEBUG
    Serial.println("Go to sleep"); delay(100);
    #endif
    // Enter power down state for 2s.
    bitClear(ADCSRA, ADEN);
    PMU.sleep(PM_POFFS0, SLEEP_2S);
    bitSet(ADCSRA, ADEN);
    
    // Do something here
    // Example: Read sensor, data logging, data transmission.
    #ifdef DEBUG
    Serial.print("A0 = "); Serial.println(analogRead(A0));
    delay(100);
    #else
    analogRead(A0);
    #endif
}