pcf8574 ReadAll in low memory compare to single value byte

[Fernando]

Hello Everyone,
I have a byte field that I need to compare with ReadAll without using low memory,
After several attempts I couldn’t, how to compare

PCF8574 :: DigitalInput di = pcf85741.digitalReadAll (); 

with byte value?

ex:

byte valor = 220;
if(valor == PCF8574 :: DigitalInput di = pcf85741.digitalReadAll ());

Thank you

[Renzo Mischianti]

Hi Fernando,
you must reduce the DigitalInput object to a byte like so:

byte byteValReadAll = 0;

void setVal(uint8_t pin, uint8_t value){
	if (value==HIGH){
		byteValReadAll = byteValReadAll | bit(pin);
	}else{
		byteValReadAll = byteValReadAll & ~bit(pin);
	}

}

[...]
	setVal(P0, digitalInput.p0);
	setVal(P1, digitalInput.p1);
	setVal(P2, digitalInput.p2);
	setVal(P3, digitalInput.p3);
	setVal(P4, digitalInput.p4);
	setVal(P5, digitalInput.p5);
	setVal(P6, digitalInput.p6);
	setVal(P7, digitalInput.p7);
	
	Serial.println(byteValReadAll, BIN);
[...]

Bye Renzo

[Author]

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