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Home › Forums › The libraries hosted on the site › PCF8574 i2c digital I/O expander › Add functionality to check if device is connected properly.
Tagged: Enhancement
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
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
Any tips on how to check if digitalReadAll() is successful?
Br/Mob
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
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