FAQ:General

From GNU 68HC11/HC12

(Difference between revisions)

Revision as of 16:20, 18 February 2006

It is suggested to start with a simple example. The GNU Development Chain comes alone and does not have any example packaged with it.

However, you can get the GNU Embedded Libraries which contain a number of utility libraries and several examples. GEL is available at:

You can also compile this small program, which does nothing useful (just to show out the procedure):

unsigned short fact(unsigned short a)
{
  if (a)
    return a * fact (a - 1);
  else
    return 1;
}
int main()
{
  return fact (5) - fact (4);
}

You must compile it with the following command:

  m6811-elf-gcc -o prog.elf prog.c -mshort -g -Os

And you can execute or debug it with the GNU Debugger as follows:

  m6811-elf-gdb prog.elf
  <i>(gdb)</i> target sim
  <i>(gdb)</i> load
  <i>(gdb)</i> b main
  <i>(gdb)</i> run
  <i>(gdb)</i> step
  ...

@@ Line 1: / Line 1: @@
 ==I have downloaded everything, what do I do now?==
+It is suggested to start with a simple example.  The GNU Development
+Chain comes alone and does not have any example packaged with it.
+However, you can get the GNU Embedded Libraries which contain a number
+of utility libraries and several examples.  GEL is available at:
+[[http://gel.sourceforge.net http://gel.sourceforge.net]]
+You can also compile this small program, which does nothing
+useful (just to show out the procedure):
+<pre>
+unsigned short fact(unsigned short a)
+{
+  if (a)
+    return a * fact (a - 1);
+  else
+    return 1;
+}
+int main()
+{
+  return fact (5) - fact (4);
+}
+</pre>
+You must compile it with the following command:
+<pre>
+  m6811-elf-gcc -o prog.elf prog.c -mshort -g -Os
+</pre>
+And you can execute or debug it with the GNU Debugger as follows:
+<pre>
+  m6811-elf-gdb prog.elf
+  <i>(gdb)</i> target sim
+  <i>(gdb)</i> load
+  <i>(gdb)</i> b main
+  <i>(gdb)</i> run
+  <i>(gdb)</i> step
+  ...
+</pre>
 ==Is S19 format supported?==
 ==Why is release 2.x based on gcc 3.0.4 ?==
 ==What is ELF?==
 ==Is my processor or board supported?==