Hello, 
First, thank you for creating this awesome program that allows me to program arduino in a professional IDE. I dont think I could last to long with the arduino ide. 

My question is, I would like to use the C library of setting up a stream and my own getchar and putchar  routines  instead of using arduinos serial print commands. 

My goal is to stick with using the C language since i know it, and to keep code size small,  but use Arduino libraries when necessary. 

In an arduino project the compiler chokes on the line
static FILE mystdout = FDEV_SETUP_STREAM(USART_putchar, USART_getchar,_FDEV_SETUP_RW);

giving the err msg
Print.h:24: In file included from
Stream.h:26: from
HardwareSerial.h:29: from
arduino.h:232: from
Test1.ino: from
Test1.ino:16: sorry, unimplemented  non-trivial designated initializers not supported
   FILE mystdout = FDEV_SETUP_STREAM(USART_putchar, USART_getchar,_FDEV_SETUP_RW)
Test1.ino:16: sorry, unimplemented  non-trivial designated initializers not supported
Test1.ino:16: sorry, unimplemented  non-trivial designated initializers not supported

But the code runs fine if it is the project is started as a non-arduino project (ie avr project which uses GCC)

Any help is appreciated.

Joe McCarron

The code is pretty much identical and runs in the avr studio environment with out error messages so the 
redirection of std out is known in that tool chain.

It is just that I get the error msgs that I posted when running as an arduino project.
I looked at that article and I am doing the same except I get errors when building. 
It is like the tools do not know where the stdio.h file is located

If I go to Project->Properties->Toolchain->General      The default include paths include the path to the standard
C library stdio.h and the rest of the .h files so the tools know where those files are.

I do not understand the error msg as it is referencing the arduino files and not standard C files.

 

Ok, so I made the changes to the switches as you recommended.
So I generated a cpp file but I had to open either a project.ino or project.cppproj to be able to compile again.
Yes, even if the project.ino was empty it would still have to be selected. After adding the project.cpp file I did another build but with the same results  error msgs   

Test1.ino: In file included from
stdio.h:395: sorry, unimplemented  non-trivial designated initializers not supported
Test1.ino:10: note  in expansion of macro FDEV_SETUP_STREAM
   static FILE mystdout = FDEV_SETUP_STREAM(USART_putchar, USART_getchar,_FDEV_SETUP_RW)
stdio.h:395: sorry, unimplemented  non-trivial designated initializers not supported
Test1.ino:10: note  in expansion of macro FDEV_SETUP_STREAM
   static FILE mystdout = FDEV_SETUP_STREAM(USART_putchar, USART_getchar,_FDEV_SETUP_RW)
stdio.h:395: sorry, unimplemented  non-trivial designated initializers not supported
Test1.ino:10: note  in expansion of macro FDEV_SETUP_STREAM
   static FILE mystdout = FDEV_SETUP_STREAM(USART_putchar, USART_getchar,_FDEV_SETUP_RW)
Error compiling project sources

Thanks for  your help.

The only way I found to get around the issue was to:

Use sprintf to get desired output as a string, then either use serial.println 
or in my case a function that just sends characters to the serial port

Arduino can not print floats either as it takes to much memory. 

A work around is to use dtostrf  which is from the standard C library and it 
converts a double to a string.  dtostrf increases memory usage by 1.5k so it is rather bloaty.
But if you need to print floating point numbers, that will work.