Mail Archives: geda-user/2013/07/11/14:40:51
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On 07/11/2013 10:15 AM, Rob Butts wrote:
> All good questions!
>
> I'm not sure how I'm going to read that file into memory. At this
> point I'd like to see what is in it and thought it might help me
> figure out how to read it into memory.
>
> I'll be using a microchip micro. I've never done anything like this
> so I'm just trying to figure it out.
What you have is a binary data file that you want to flash into the
microprocessor somehow, in such a way that your program can find it. I
know how to do this for AVR's... but don't use Microchip processors, so
you'll need to find the equivalent.
You have two issues to solve:
1) get the binary data into a format that can be incorporated into the
binary image of your program, at which point the programmer should be
happy to stuff it into the chip.
2) make the address of the binary data available to your program as a
pointer.
With AVR's, you would typically put just enough linkage dictionary
around the binary blob to create a data section (using a simple tool).
This becomes just another .o into the linker. The C program makes an
external reference to the beginning of the data section to set a
pointer. Drop the whole works into the linker so that it can sew
together the external references, and from there on its just the normal
flow for flashing an image.
BTW -- Now would be a good time to take a quick peek at how many bytes
your audio file is, and how much flash space you have in your
microcontroller.
-dave
>
>
> On Thu, Jul 11, 2013 at 12:37 PM, Gareth Edwards
> <gareth AT edwardsfamily DOT org DOT uk <mailto:gareth AT edwardsfamily DOT org DOT uk>> wrote:
>
> On 11 July 2013 17:17, Rob Butts <r DOT butts2 AT gmail DOT com
> <mailto:r DOT butts2 AT gmail DOT com>> wrote:
> > That gave me a .raw file but I can't open it to see the data and
> if I double
> > click on the file I get an Open With window suggesting a slew of
> > applications.
> >
>
> The bytes of that file are the bytes of the audio data. Why do you
> need to see them? (hexl-mode in Emacs or any other hex editor will let
> you if you really think you need to)
>
> You said you were going to "store it in memory on a board and then
> DtoA it to a speaker when needed." - how do you intend to get it into
> the board memory?
>
>
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<div class="moz-cite-prefix">On 07/11/2013 10:15 AM, Rob Butts
wrote:<br>
</div>
<blockquote
cite="mid:CALSZ9gr8xG+60RPj84z90qg7snwZqq=Z1wK+W3TThvzAsECGQA AT mail DOT gmail DOT com"
type="cite">
<div dir="ltr">
<div>
<div>All good questions!<br>
<br>
</div>
I'm not sure how I'm going to read that file into memory. At
this point I'd like to see what is in it and thought it might
help me figure out how to read it into memory.<br>
<br>
</div>
I'll be using a microchip micro. I've never done anything like
this so I'm just trying to figure it out.<br>
</div>
</blockquote>
What you have is a binary data file that you want to flash into the
microprocessor somehow, in such a way that your program can find it.
I know how to do this for AVR's... but don't use Microchip
processors, so you'll need to find the equivalent.<br>
<br>
You have two issues to solve:<br>
<br>
1) get the binary data into a format that can be incorporated into
the binary image of your program, at which point the programmer
should be happy to stuff it into the chip.<br>
<br>
2) make the address of the binary data available to your program as
a pointer.<br>
<br>
With AVR's, you would typically put just enough linkage dictionary
around the binary blob to create a data section (using a simple
tool). This becomes just another .o into the linker. The C program
makes an external reference to the beginning of the data section to
set a pointer. Drop the whole works into the linker so that it can
sew together the external references, and from there on its just the
normal flow for flashing an image.<br>
<br>
BTW -- Now would be a good time to take a quick peek at how many
bytes your audio file is, and how much flash space you have in your
microcontroller. <br>
<br>
-dave<br>
<br>
<br>
<blockquote
cite="mid:CALSZ9gr8xG+60RPj84z90qg7snwZqq=Z1wK+W3TThvzAsECGQA AT mail DOT gmail DOT com"
type="cite">
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Thu, Jul 11, 2013 at 12:37 PM,
Gareth Edwards <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:gareth AT edwardsfamily DOT org DOT uk" target="_blank">gareth AT edwardsfamily DOT org DOT uk</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="im">On 11 July 2013 17:17, Rob Butts <<a
moz-do-not-send="true" href="mailto:r DOT butts2 AT gmail DOT com">r DOT butts2 AT gmail DOT com</a>>
wrote:<br>
> That gave me a .raw file but I can't open it to see
the data and if I double<br>
> click on the file I get an Open With window
suggesting a slew of<br>
> applications.<br>
><br>
<br>
</div>
The bytes of that file are the bytes of the audio data. Why
do you<br>
need to see them? (hexl-mode in Emacs or any other hex
editor will let<br>
you if you really think you need to)<br>
<br>
You said you were going to "store it in memory on a board
and then<br>
DtoA it to a speaker when needed." - how do you intend to
get it into<br>
the board memory?<br>
</blockquote>
</div>
<br>
</div>
</blockquote>
<br>
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