USIWire compile error

[adrianmihalko]

Is there any compatibility issue with this library and Arduino 1.8.12?

Without Usiwire library I get error about missing library (as expected)

In file included from /Users/adrianmihalko/Downloads/attiny_daemon-master/firmware/ATTinyDaemon/ATTinyDaemon.ino:1:0:
ATTinyDaemon.h:1:10: fatal error: USIWire.h: No such file or directory
 #include <USIWire.h>
          ^~~~~~~~~~~
compilation terminated.
exit status 1
USIWire.h: No such file or directory

Now, I install library as Sketch - Include Library - Add .ZIP Library and I choose USIWire-0.1.0.zip.

I click Very/Compile and I get the error:

In file included from /Users/adrianmihalko/Documents/Arduino/libraries/USIWire-0.1.0/src/USI_TWI_Master/USI_TWI_Master.h:76:0,
                 from /Users/adrianmihalko/Documents/Arduino/libraries/USIWire-0.1.0/src/USIWire.cpp:27:
/Users/adrianmihalko/Documents/Arduino/libraries/USIWire-0.1.0/src/USI_TWI_Master/usi_io.h:1:1: error: expected unqualified-id before '.' token
 ../USI_TWI_Slave/usi_io.h
 ^
/Users/adrianmihalko/Documents/Arduino/libraries/USIWire-0.1.0/src/USIWire.cpp: In member function 'void USIWire::begin()':
/Users/adrianmihalko/Documents/Arduino/libraries/USIWire-0.1.0/src/USIWire.cpp:55:3: error: 'USI_TWI_Master_Initialise' was not declared in this scope
   USI_TWI_Master_Initialise();
   ^~~~~~~~~~~~~~~~~~~~~~~~~
/Users/adrianmihalko/Documents/Arduino/libraries/USIWire-0.1.0/src/USIWire.cpp:55:3: note: suggested alternative: 'USI_TWI_Slave_Initialise'
   USI_TWI_Master_Initialise();
   ^~~~~~~~~~~~~~~~~~~~~~~~~
   USI_TWI_Slave_Initialise
exit status 1
Error compiling for board ATtiny25/45/85.

I am not alone with this problem:

https://github.com/jbaumann/attiny_daemon/issues/7

[puuu]

Please show a minimal example and describe the settings and the version you are using (ATTiny Core).

I cannot reproduce that. The examples TestMaster and TestSlave compile for me. Tested with:

• Arduino: 1.8.12
• ATTinyCore: 1.3.3
• Board: ATtiny25/45/85
• Chip: ATtiny85

[jbaumann]

[copied from original issue] Ok, I'm not sure how this happens, but if you use "Sketch - Include Library - Add .ZIP Library", then the file contains only the following: "../USI_TWI_Slave/usi_io.h". This is clearly wrong and two possible explanations are on the top of my mind:

• The original author uses a symbolic link that is interpreted wrongly by the Arduino IDE when unpacking the files
• The Zip-Archive knows that both files are the same and saves only a reference, which again is interpreted wrongly by the Arduino IDE In both case I would see the problem in the Arduino IDE.

Two simple possible fixes:

• Copy the file from the TWI_Slave over to the TWI_Master
• Remove the directory, unpack the library manually and copy it to your libraries folder

I suggest the second way as the general way to install libraries. This ensures that everything that goes wrong comes from your own errors.

[adrianmihalko]

Release 0.2.0 solved the issue.

[puuu]

Thank you for reporting and pointing the issue. Version 0.2.0 was released, which no longer contains symbolic links.

According to the Library Manager FAQ, symlinks are no longer allowed, this was documented in February 2018. This is probably also the reason why USIWrire disappeared from the Arduino Library Manager.