Conflict between SoftwareSerial and PCF8574 library

Projects Programming
1

Im trying to use both SoftwareSerial and library for PCF8574 chip (downloaded from here: GitHub - skywodd/pcf8574_arduino_library: PCF8574 / PCF8575 Arduino library (version 2.0)).

On compile IDE show this:

/usr/bin/avr-ld: warning: -z relro ignored.
PCF8574/PCF8574.cpp.o: In function `__vector_9':
/home/ndd/sketchbook/libraries/PCF8574/PCint.h:108: multiple definition of `__vector_9'
SoftwareSerial/SoftwareSerial.cpp.o:/usr/share/arduino-1.0.5/libraries/SoftwareSerial/SoftwareSerial.cpp:306: first defined here
collect2: error: ld returned 1 exit status

So i guess that problem is both libraries try to use same 'vector'. How to solve this? Are there any other 'vectors' (no idea what it is) which i can switch in one library to resolve conflict?

2

If you have pins 8 and 9 free, you could try using AltSoftSerial instead of SoftwareSerial.

3

PaulS:
If you have pins 8 and 9 free, you could try using AltSoftSerial instead of SoftwareSerial.

SoftwareSerial is using pin 8 as rx and pin 9 is used by buzzer. So, this conflict is impossible to solve and i have to use other library?

4

SoftwareSerial is using pin 8 as rx

So, pin 8 would be available for use by AltSoftSerial.

and pin 9 is used by buzzer.

And you can't move it? Or won't move it?

It it's can't, then I don't have any other ideas.

It it's won't, then you are shit out of luck.

5

PaulS:
And you can't move it?

Can't. No more free pins. Maybe when i get second PCF8674 chip to move LCD to it. Temporarily im not using PCF8574 lib, just Wire lib.

6

ndd12:

PaulS:
And you can't move it?

Can't. No more free pins. Maybe when i get second PCF8674 chip to move LCD to it. Temporarily im not using PCF8574 lib, just Wire lib.

Can you tell us what pins you are using, and what you are using them for?

7

Pins
2-3 => PCF8574
4-7 => LCD
8 => SoftwareSerial RX
9 => buzzer
10 => LCD backlight control
11-12 => LCD
13 => Fan control

8

So, you have a bunch of pins on the other side of the board that can also be used as digital pins. A0, A1, etc.

9

Can i use analog pins as digital? Arent they read-only?

10

Can i use analog pins as digital?

Yes.

Arent they read-only?

As analog pins, yes. As digital pins, no.