Ya, the example looks good to me. In fact, I didn't know you could use
useful labels for the asm vars, I have a few that all use A1 B2, etc.
In my code, I just used straight C to convert from BCD to Bin (and vice
versa), although, you're looks to be far more efficient.
On the assembly for the dadd, seems like you are going to a bit of extra
work, this too would work:
__asm__( "DADD.W %A1, %A0 \n\t" : "=r" (bcd_a) : "r" (bcd_b) );
Found one pet peve:
In file: x33.html, the word "its" is missing an apostrophe. The word is
short for "It is", I know you know this (being British), but some others
here might not :)
-Mark
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Steve
Underwood
Sent: Tuesday, June 10, 2003 8:58 AM
To: [email protected]
Subject: Re: [Mspgcc-users] FAQ
Mark Stokes wrote:
>Great FAQ!!!
>Some suggestions:
>x27.html :
>You might add that any and all BCD variables must be dealt with
straight
>assembly, but then tell them how easy it is.
>
I just added something in the "I will still need to use some assembly
language somewhere, won't I?" section about BCD. I didn't have any
examples of using assembly language to access special machine features,
as one might do on any processor. BCD handling is a good one. I included
some example code - a normal routine for binary->BCD conversion, and a
little inlined one for adding. The conversion routine is pasted in from
my own software. The addition routine is unchecked!
>x81.html:
>You need to replace "do" with "to" in the title.
>
Done.
>Great work (and thanks for the pwm example).
>
We should really build a library of source code like this, as the wheel
keeps getting reinvented far too often.
I've seen a few nice examples of something in this area recently.
Someone showed me a routine for setting an FLL to any frequency. You
wouldn't really use this routine in a real embedded program, as its
generality makes it too big. However, reading through it is the best way
I have found to figure out what to put in the registers to achieve the
specific FLL frequencies I actually want.
Regards,
Steve
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