Subject:
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Re: GCC 2.8.1 for HC11
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 8 Apr 1999 19:47:48 GMT
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Original-From:
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Keith Hearn <khearn@Legato.COM+nospam+>
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Viewed:
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1098 times
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The problem I have isn't programming the HC11. I picked that up with
no problem by spending a day reading Motorola's reference manual
(AKA the pink book - kindly provide free by Motorola via their web page).
I've got a software background, and while my assembly experience is
limited, it's just yet another language. And the pink book is fairly
clear on what you have to write where to make the values you want go
to the pins you want (or come from the pins you want).
My problem is figuring out how the HC11 is used in the HB. Sure, I
know that after doing an A-D conversion I can read the input from
one of the ADR* registers, but how (other than reading other
people's code) am I supposed to figure out that I have to first write
001 into the high three bits of 0x4000 if I want to read from analog
ports 25-31?
Where can I find out what pins connect through which mux to which
I/O connector on the HB?
And how on earth is anyone supposed to figure out how the LCD
communications work without reading other people's code? I've read
other people's code, I've read the pink book, I now understand how
it works (yee gads! it's scary). But there's no way you'd ever figure
it out just from reading HC11-specific info. And you'd have to have
a degree in digital electronics to figure it out from the
schematics.
That sort of this is very specific to the handyboard design, not to
the HC11.
Keith
In message <370CFC42.A977D06F@pacbell.net>, Gary Livick writes:
> Keith,
>
> I have a reference for you. It is "Microcomputer Engineering," 2nd ed. by Ge
> ne H.
> Miller. You can get it from one of the online book sellers, like amazon.com.
> It
> is around $85 or so.
>
> In this text is the whole range of things having to do with assembly language
> programming the HC11. It's detailed and I find it readable.
>
> I agree with you that there is not a lot having to do with programming of ele
> ments
> deep within the HC11, but there is enough if you *really* dig. I learned
> everything I know, which admittedly isn't much, off the internet, in just a f
> ew
> texts, and by studying other people's code as you do. Someday, I may even
> understand some of it!
>
> Gary Livick
>
>
>
> Keith Hearn wrote:
>
> > I've taken a look at Chuck's LCD code, and I agree that it's the best
> > I've come across.
> >
> > I spent last weekend studying how to program the HB in assembly.
> > There is a woeful lack of documentation for it. There is plenty of
> > docs on programming in IC, but below that level, you end up looking
> > at schematics.
> >
> > I do have the Motorola reference books on the 6811, and have no
> > problem figuring out how to program the SCI, SPI, the various
> > handshake modes, et. al., but figuring out how they relate to the
> > various handy board (and especially expansion board) connectors is
> > really tough.
> >
> > Is there something I've missed that describes how to do low level
> > programming on the handyboard?
> >
> > Just about everything I've figured out how to do came from reading
> > other people's code.
> >
> > So I've spent some hours lately reading the code other people have
> > written for the handyboard and the miniboard. And I really like
> > Chuck's libraries.
> >
> > BTW, if there's nothing out there that describes low-level programming
> > on the handyboard, I'll probably write up my notes on what I've
> > learned and make them available so future people don't have to go
> > through what I'm going through.
> >
> > Keith
> >
> >
>
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Message has 2 Replies:
 | | Re: GCC 2.8.1 for HC11
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| (...) You have to get good at reading schematics in this case, period. Schematics are very hard to read at first, but it does get easier quickly. If someone were to write up details on how to access various devices on the Handyboard though (...) (25 years ago, 9-Apr-99, to lugnet.robotics.handyboard)
| | | GCC/HC11 small patch
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| I contacted the original person who did the HC11 port to gcc (Otto Lind), and he pointed me to a patch for it. If you're using gcc-2.8.1 with the HC11 patches in it, you may want to try this: At line 502 of config/m6811/m6811.c, change from: { (...) (25 years ago, 9-Apr-99, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | Re: GCC 2.8.1 for HC11
|
| Keith, I have a reference for you. It is "Microcomputer Engineering," 2nd ed. by Gene H. Miller. You can get it from one of the online book sellers, like amazon.com. It is around $85 or so. In this text is the whole range of things having to do with (...) (25 years ago, 8-Apr-99, to lugnet.robotics.handyboard)
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