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<P><BR><A
href="http://ucos-ii.com/contents/support/faqs.html#faq1">FAQ-01:</A>
<B>My computer/processor 'hangs' when I run 礐/OS or 礐/OS-II! </B></P>
<P><A
href="http://ucos-ii.com/contents/support/faqs.html#faq2">FAQ-02:</A>
<B>Are you allowed to send a NULL-pointer through a Mailbox or a
Queue?</B></P>
<P><A
href="http://ucos-ii.com/contents/support/faqs.html#faq3">FAQ-03:</A>
<B>Where should I enable the 'tick' interrupt?</B></P>
<P><A
href="http://ucos-ii.com/contents/support/faqs.html#faq4">FAQ-04:</A>
<B>Does 礐/OS and 礐/OS-II work with Microsoft C/C++?</B></P>
<P><A
href="http://ucos-ii.com/contents/support/faqs.html#faq5">FAQ-05:</A>
<B>Are there other ports available for 礐/OS and 礐/OS-II? </B></P>
<P><A
href="http://ucos-ii.com/contents/support/faqs.html#faq6">FAQ-06</A>:<B>
Is there a better way to implement OSIntCtxSw() and
ISRs?</B><BR>
(Added 2001/01/26) </P>
<P><BR></P>
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<TD class=title>F<A name=faq1></A>AQ-01: My computer/processor
'hangs' when I run 礐/OS or 礐/OS-II!</TD></TR></TBODY></TABLE>
<P>DOS executables for 礐/OS and 礐/OS-II are provided on the diskette. If
礐/OS (or 礐/OS-II) still hangs with the executable provided on the
floppy, try to contact me at <A
href="mailto:Jean.Labrosse@uCOS-II.com">Jean.Labrosse@uCOS-II.com</A>. If
礐/OS (or 礐/OS-II) does not hang with the executable provided on the
floppy then there are two possible reasons your computer could crash: </P>
<P><B>1)</B> You need to look at <SPAN class=codewiew>OSIntCtxSw</SPAN>
(pages 62, 63 and 67 in the 礐/OS book or pages 200 and 201 in 礐/OS-II)
which is processor and compiler specific. The very first instruction
in <SPAN class=codewiew>OSIntCtxSw()</SPAN> may need some adjustment, i.e.
<SPAN class=codewiew>ADD SP,8</SPAN>. If you use another processor,
compiler or memory model, you may need to adjust the constant.
This section in the book will explain how to determine the 'magic number'
to add to the stack pointer. <BR>The actual value depends on
the compiler used and the compiler options. For example, on the x86
real-mode small model, the constant can be either 4, 6, 8, 10 ...
For the x86 real-mode, large model, the constant can be either 8, 10, 12,
14, 16 ...</P>
<P><B>2)</B> You may want to try removing ANY (and ALL) floating-point
operation. The sample code in example #1 (礐/OS V1.xx and 礐/OS-II
V2.00) has a floating-point operation in the start task. Comment it
out (by putting <SPAN class=codewiew>#if 0 / #endif</SPAN> around the
<SPAN class=codewiew>sprintf()</SPAN> statement) and try compiling and
running the code. If the code works, the crash is due to the fact
that:<BR> a) The Borland C/C++ floating-point library is
non-reentrant.<BR> b) 礐/OS and 礐/OS-II's task stacks
need to be initialized to perform floating-point operations in a reentrant
way. Refer to AN-1001 for details (See <A
href="http://ucos-ii.com/contents/support/appl_notes.html">AppNotes</A>).
</P>
<P><B>3)</B> See <A
href="http://ucos-ii.com/contents/support/faqs.html#faq6">FAQ-06</A>. </P>
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<TD class=title>F<A name=faq2></A>AQ-02: Are you allowed to send a
NULL-pointer through a Mailbox or a Queue?</TD></TR></TBODY></TABLE>
<P>No. By definition, a NULL-pointer is not supposed to point to any
valid data. You could, however, 'fake' 礐/OS (or 礐/OS-II) into
sending NULL pointers. You will need to 're-map' a NULL pointer to
another 'invalid' pointer. For example, if you want to send a NULL
through a message mailbox, you can do the following:</P>
<P class=codewiew>void SenderTask (void *pdata)<BR>{<BR>
.<BR> .<BR> if (msg == (void *)0) {
/* Do I want to send a NULL pointer ?
*/<BR> msg = (void *)0xFFFFFFFF;
/* Yes, remap to another 'invalid'
pointer */<BR> }<BR> OSMboxPost(Mbox,
msg);<BR> .<BR> .<BR>}void
ReceiverTask (void *pdata)<BR>{<BR> void
*msg;<BR> .<BR>
.<BR> msg = OSMboxPend(Mbox, 0, &err);
<BR> if (err == OS_NO_ERR)
{<BR> if (msg == (void
*)0xFFFFFFFF) { /* Did I receive a NULL pointer ?
*/<BR>
msg = (void *)0;<BR>
}<BR>
.<BR> .<BR>
}<BR> .<BR> .<BR>} </P>
<P></P>
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