Add functionality to check if device is connected properly.

[Michiel]

Hey Renzo,

Thank you for this very usefull library! I am using it for a current project, however I found that I am not able to see if the device is connected properly.

As a solution to this, I would like to suggest that the return value of “_write.endtransmission()” is used to see if the I2C transmission was succesfull.

For example, a “status” parameter could be added to the PCF8574 class, which indicates that the latest transmission has failed. It is also possible to return the result of “_write.endtransmission()” in the .begin() function, instead of using a void function.

Feel free to do with this suggestion as you please.

Best, Michiel

[Renzo Mischianti]

Hi Michiel

now It’s possible to check the status with

if (pcf8574.begin()){
Serial.println("pcf8574 started!");
}else{
Serial.println("pcf8574 not started!");
}

or

if (pcf8574.digitalWrite(P7, startVal)){
Serial.println("Write ok");
}else{
Serial.println("Write not ok");
}

It’s also possible to get last writeStatus with

uint8_t getTransmissionStatusCode() const {
return transmissionStatus;
}

bool isLastTransmissionSuccess(){
return transmissionStatus==0;
}

Bye Renzo

[Mob]

Any tips on how to check if digitalReadAll() is successful?

Br/Mob

[Renzo Mischianti]

I think there Is no way tuo check that the buffer retrieved Is correct.

I only check if there are data to buffer but It isn’t a solution maybe.

Bye Renzo

[Author]

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