Until now there was no complete C standard library (aka libc) available for the Casio calculators. Although some parts of this library have been provided by fxlib and gint, there was no libc implementation complying with the standard and compatible with the sh3eb architecture ready to use.
To change that, I decided to port newlib to the Casio CPU. Newlib is an alternative libc implementation intended for use on embedded systems.
Follow this link and click the download button in the top right corner:
For a complete tutorial on how to setup a toolchain for Casio calculators, see Compiler sous Linux avec GCC.
To build newlib, you first need binutils and gcc for the target
sh3eb-elf. Make sure to configure gcc with the arguments
Now you can install newlib. Simply call configure and make:
../newlib-cygwin/configure --target=sh3eb-elf --prefix=... make make install
Afterwards, you have to build gcc again with the argument
For a more detailes tutorial about how to setup newlib in general, see this more detailed turorial.
Newlib provides releases in their ftp directory and their code on their git repository. I try to rebase my fork regulary to their master branch to keep it up-to-date.
There is a great explanation on the naming convention of targets. To really understand what
sh3eb-elf means, I’ll boil it down for you:
To compile code for our Casio calulator, we need to tell newlib where we want to run the code. In our case, the target’s name is
sh is here short for the SuperH processor architecture. (Fortunately, newlib supports SuperH the by default.)
To be more specific,
sh3 is a 32-bit CPU architecture of the SuperH family. Furthermore,
eb stands for the
big endian format (that indicates the byte order used for multi-byte variables). Usually a target also indicates a vendor which in this case is
unknown. Lastly, the end of the target’s name is
elf (which is usually the kernel). Here, we have no kernel (and hence no operating system) at all.
For newlib, the target
sh3eb had to be specifically added.