SDCC

SDCC is a small Device C Compiler that was specifically designed to the needs of 8 Bit Micros like Intel 8051, Maxim 80DS390, Zilog Z80 among others. SDCC comes with SDCDB a source level debugger and ucSim a free open source simulator for Intel 8051 and other micro-controllers

Installation

Debian

apt-get install sdcc

Working with SDCC

Compiling a program

Write this in an ASCII editor and call the archive test.c (Or wathever name you want):

char test;
void main(void) {
   test=0;
}

Then:

sdcc -c test.c

The -c option is for disable the linker, the next step is trying without the linker:

sdcc test.c

Final test, modify the test file and include the following (if all goes without warnings SDCC is well instaled):

#include <string.h>
char str1[10];
void main(void) {
 strcpy(str1, "testing");
}

this is needed to test that SDCC supports libraries.

For OLPC we are going to work with the 8051 processor, for single source file 8051 projects you can Compile your programs with the following command:

sdcc sourcefile.c   

When doing this command the output files are as follows:

• sourcefile.asm - Assembler source file created by the compiler
• sourcefile.lst - Assembler listing file created by the Assembler
• sourcefile.rst - Assembler listing file updated with linkedit information, created by linkage editor
• sourcefile.sym - symbol listing for the sourcefile, created by the assembler
• sourcefile.rel or sourcefile.o - Object file created by the assembler, input to Linkage editor
• sourcefile.map - The memory map for the load module, created by the Linker
• sourcefile.mem - A file with a summary of the memory usage
• sourcefile.ihx - The load module in Intel hex format (you can select the Motorola S19 format with --out-fmt-s19. If you need another format you might want to use objdump or srecord).
• sourcefile.adb - An intermediate file containing debug information needed to create the .cdb file (with --debug)
• sourcefile.cdb - An optional file (with --debug) containing debug information.
• sourcefile. - (no extension) An optional AOMF or AOMF51 file containing debug information (generated with option --debug). The (Intel) absolute object module format is a sub-format of the OMF51 format and is commonly used by third party tools (debuggers, simulators, emulators).
• sourcefile.dump* - Dump file to debug the compiler itself (generated with option --dumpall)

Related Documentation

If you want to see more documentation specifically for the 8051 try this file:

/usr/share/sdcc/include/mcs51/

SDCDB

Compilling for Debugging

--debug When this option is used the compiler will generate debug information. The debug information collected in a file with .cdb extension can be used with the SDCDB. Another file with no extension contains debug information in AOMF or AOMF51 format which is commonly used by third party tools.

Links

• http://sdcc.sourceforge.net/
• http://en.wikipedia.org/wiki/Small_Device_C_Compiler
• http://sdccokr.dl9sec.de/
• http://www.pjrc.com/tech/8051/.