Add functionality to check if device is connected properly.

Tagged: Enhancement

This topic has 3 replies, 1 voice, and was last updated 3 years, 8 months ago by Renzo Mischianti.

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- 4 June 2020 at 07:44 #4384
  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
- 4 June 2020 at 07:46 #4385
  Renzo Mischianti
  Keymaster
  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
- 2 September 2020 at 20:36 #6058
  Mob
  Any tips on how to check if digitalReadAll() is successful?
  
  Br/Mob
- 2 September 2020 at 22:22 #6062
  Renzo Mischianti
  Keymaster
  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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