Problem compiling 3pi-demo-program

I am unable to get the 3pi-demo-program to compile. I think it may have something to do with the avr/pgmspace.h library.

When I try to compile I get the error below. It looks like the prog_char type is not being recognized correctly. Any ideas on how to fix this?

Here is the code for reference.
test.c (13.4 KB)

Hello, alzabo.

Thank you for letting us know about this problem. In recent versions of avr-libc, prog_char and similar typedefs have been deprecated. The relevant documentation is here: … space.html

I think you might be able to fix the problem by writing the following line at the very top of the program:


Let me know if that works. I think it will not work for the latest version of avr-gcc, but it might work for you.

The next release of the Pololu AVR C/C++ Library should be fixed to not use those types.


The compiler gives warnings for use of deprecated typedef; however, the code compiles and everything appears to function normally. Thanks!