SQLite expects a file system. "SQLite reads and writes directly to ordinary disk files." https://www.sqlite.org/about.html
You need a minimal file system. A file system does not have to be large. CP/M ran on an 8 bit Z-80 with less than 64k of RAM (but the original CP/M was written in Z-80 assembly language -- not C). Here is an article on a stripped down Linux for M3/M4: uCLinux http://electronicdesign.com/embedded/practical-advice-running-uclinux-cortex-m3m4 And here is website for SQLite for uClinux. http://www.menie.org/georges/uClinux/sqlite.html The other option would be to emulate the Linux system file calls. You could start from scratch or download the Linux source code (assuming you have installed and know how to use git source code management system): # the Linux kernel (approx. 640MB download): $ git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git https://www.kernel.org/pub/software/scm/git/docs/user-manual.html#how-to-get-a-git-repository Hope this helps. Jim Callahan Orlando, FL On Mon, Jul 13, 2015 at 5:52 AM, Shuhrat Rahimov <sandrorkmv at gmail.com> wrote: > Hello, > I was trying to run SQLite on ARM Cortex M4 CPU. What I need is a minimal > SQLite without the most features. I have no file system, so I wanted to > save a single file db on the internal MCU flash. I have successfully cross > compiled SQLite for ARM Cortex M4. I have set among others compile time > options SQLITE_OS_OTHER=1 and SQLITE_THREADSAFE=0. Now I wanted to > implement a VFS. I want to save db tables directly in internal flash > without a file system. I have difficulties to understand test_onefile.c > implementation provided by SQLite. How could I edit that file in order to > be able to write file content on the internal MCU flash? Please, could > someone explain it to me or give some links where it is explained? > Kind Regards > _______________________________________________ > sqlite-users mailing list > sqlite-users at mailinglists.sqlite.org > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users >
