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Utils.h

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/// Will be negative for future times

long timeSince(unsigned long previousTime) {

return millis() - previousTime;

}

byte Reverse(byte b) {

b = (b & 0xF0) >> 4 | (b & 0x0F) << 4;

b = (b & 0xCC) >> 2 | (b & 0x33) << 2;

b = (b & 0xAA) >> 1 | (b & 0x55) << 1;

return b;

}

// Example

// PrintF("Rendering Row %d\n", row);

// https://stackoverflow.com/a/77608699/13497411

int PrintF(const char* format, ...) {

static char buffer[1024]; // Adjust to your needs

va_list aptr;

va_start(aptr, format);

int results = vsnprintf(buffer, sizeof(buffer), format, aptr);

va_end(aptr);

Serial.print(buffer);

return results;

}