A simple operating system for the ESP32-based M5StickC
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#include <M5StickC.h>
#include "Util.h"
unsigned long millis_since(unsigned long timestamp)
{
unsigned long now = millis();
if (now < timestamp)
{
return (4294967295 - timestamp) + millis();
}
else
{
return millis() - timestamp;
}
}