latest news.mht

一个基于AVR单片机的大屏幕mp3

<H4>21 February 2004</H4>
<P>I've moved this website to a new hosting provider (<A=20
href=3D"http://www.manuallabour.biz/">manuallabour.biz</A>) over the =
last couple=20
of days. It's possible, although unlikely, that emails to me may have =
bounced=20
while my frankvh.com domain was being transferred. So, if you sent me an =
email=20
and it bounced, or you didn't hear back from me, I do apologize - please =
send it=20
again. Again, it is unlikely I missed any emails, because I had the new =
system=20
fully set up before I initiated the domain transfer. But in the =
wonderful world=20
of computers, anything is possible... &lt;grin&gt;</P>
<P>&nbsp;</P>
<H4>12 February 2004</H4>
<P>Added a couple of methods to allow faster jumping around the songs in =
the=20
directory. The up and down buttons now jump forward and back 10 songs=20
respectively. Similarly the right and left buttons jump forward and back =
100=20
songs respectively. In addition, by holding down the "next" button it's =
possible=20
to change the number of songs the player advances (or goes backwards) by =

default, up to 1000. See the <A=20
href=3D"http://www.frankvh.com/mp3player/software.htm">software page</A> =
for full=20
details. With these changes it's now very easy to move around within a =
large=20
number of tracks.</P>
<P>&nbsp;</P>
<H4>8 February 2004</H4>
<P>Hot dog - IR Remote Controls are now working! I had a couple of silly =

software bugs I needed to find. Download the software from the <A=20
href=3D"http://www.frankvh.com/mp3player/software.htm">software page</A> =
and try=20
it out. Note that not all brands and models of remote controls will =
work,=20
although most seem to. Read more in the <A=20
href=3D"http://www.frankvh.com/mp3player/software.htm#remotecontrol">IR =
remote=20
control section</A> of the software page. I welcome your <A=20
href=3D"http://www.frankvh.com/mp3player/contact.htm">feedback</A>, =
particularly=20
regarding remote-control brands you've found to work and not work.</P>
<P>I'm also PayPal verified, so I updated the site accordingly.</P>
<P>&nbsp;</P>
<H4>11 January 2004</H4>
<P><A href=3D"http://www.frankvh.com/mp3player/software.htm">New =
software</A> has=20
been posted. This version supports WinXP-formatted FAT32 harddrives. It =
also=20
contains the remote-control training code (accessed through the menus) =
however=20
the actual remote-control decoding is not completed yet. I would suggest =
you=20
only use this new code if (a) you're programming a new player for the =
first=20
time, or (b) you're having trouble with a WinXP-formatted harddisk. If =
you=20
currently have a nicely-working MP3 player this software drop isn't =
going to be=20
of use to you. Wait for the next one, which will have full =
remote-control=20
support.</P>
<P>&nbsp;</P>
<H4>10 January 2004</H4>
<P>Happy New Year! I hope everyone had a pleasant Christmas and New =
Year. Life=20
has been busy on the MP3 player software front; here's a summary.</P>
<P>Many hours have been spent working on the remote control interface. =
This is=20
almost (but not quite :-) working. The majority of the time has been =
spent=20
developing the training algorithm, where the player captures the =
infra-red=20
sequence, analyzes and stores it in eeprom. A menu function has been =
added to=20
allow the user to train the player. It's very simple; just select "play" =
from=20
the menu for example, then point the remote control at the player and =
press the=20
remote's "play" button. This is all done, and I'm currently finalizing =
the code=20
which detects the remote control commands during normal player operation =
and=20
responds accordingly.</P>
<P>A couple of people who built kits reported that when they FAT32 =
formatted a=20
disk using WinXP, the player couldn't see the MP3 files and directories. =
This=20
problem did not occur when they formatted the disk using Win98. =
Obviously=20
Microsoft does something different with WinXP. I paused work on the =
remote=20
control to investigate this. It's obvious that Microsoft is deliberately =

crippling their FAT32 support in WinXP to encourage use of NTFS. They've =
set an=20
arbitrary limit of 32 GB formatting disk size under WinXP. (If you =
format under=20
Win98 there's no size limit, and WinXP will happily read &amp; write a =
FAT32=20
drive of any size. WinXP only won't format beyond 32 GB.) Microsoft has =
also=20
needlessly altered a parameter in the Boot Parameter Block of the drive; =
this is=20
what caused the problem of the files not being seen by the player. There =
perhaps=20
is also something else changed that I haven't found yet; the player is =
not yet=20
completely happy with the WinXP-formatted drive. Once I have this solved =
I'll=20
post the updated software on this website and return to working on the =
remote=20
control interface.</P>
<P>Along the way I've added a debug interface to the debug serial port. =
Now you=20
can do things like dump the eeprom contents, boot parameter block, etc =
from the=20
debug port. (Again, I'll post the updated s/w once I have the =
WinXP-format=20
problem solved.)</P>
<P>That's it for the moment. Look for some updated s/w in the next week =
or so;=20
hopefully sooner. Happy New Year everyone!</P>
<P>&nbsp;</P>
<H4>14 December 2003</H4>
<P>Added the <A =
href=3D"http://www.frankvh.com/mp3player/atblaster.htm">ATBlaster=20
page</A> to answer the many questions I've been receiving on how &amp; =
why to=20
use it. Also added a programmed serial eeprom to the <A=20
href=3D"http://www.frankvh.com/mp3player/kits.htm">kit &amp; parts</A> =
page. There=20
seems to be several people building their own CY7C68300A-based boards; =
these two=20
additions should be of help.</P>
<P>&nbsp;</P>
<H4>9 December 2003</H4>
<P>An important correction, found the hard way. For the small tantalum=20
capacitors shipped in the kits, the black bar on the tantalum's case =
indicates=20
the positive lead. Not the negative lead as had been described =
before!</P>
<P>Also, a couple of component value changes. D1, the transzorb, is now =
a=20
1.5KE18A part. This has a lower breakdown voltage than the earlier =
1.5KE22A=20
part, which provides better protection for the board. Particularly =
better=20
protection for U1. Also, C2 is changed to a 0.22uF capacitor, down from =
0.27uF,=20
simply because 0.22uF is a far easier value to obtain.</P>
<P>The change in D1 reduces the maximum input voltage to 16 volts. So =
the input=20
voltage range for the player is between 12.5V and 16 volts DC. Above 17 =
volts=20
the transorb D1 will conduct, blowing the fuse and protecting the board =
from=20
overvoltage.</P>
<P>The schematics will be updated later this week to reflect those two =
component=20
value changes.</P>
<P>Finally, as part of my latest components buy order, I purchased a few =
1N5404=20
3-amp diodes. So if you need any for reducing the output voltage of your =
<A=20
href=3D"http://www.frankvh.com/mp3player/powersupply.htm">power =
supply</A> and you=20
can't find them at your local store, they're on the <A=20
href=3D"http://www.frankvh.com/mp3player/kits.htm">Kits &amp; Parts</A> =
page.</P>
<P>&nbsp;</P>
<H4>29 November 2003</H4>
<P>Directories are now supported! There's a new menu function which =
allows you=20
to change the current directory. It displays the name of the current =
directory=20
and allows you to scroll through the subdirectories, change into them =
(or change=20
upwards to the parent directory) for as many directory levels as you =
like. As=20
you change through directories the current directory name is =
automatically=20
updated, to make navigating through a large directory structure much =
easier. The=20
current directory is stored in eeprom to preserve it in case of a=20
power-down.</P>
<P>There's also a new menu function which displays the name of the =
current=20
directory and the number of MP3 files in it, just for fun.</P>
<P>As always, the updated software can be found on the <A=20
href=3D"http://www.frankvh.com/mp3player/software.htm">software =
page</A>.</P>
<P>Next on the list is IR remote control support. This will probably =
take a=20
little while so don't expect it tomorrow. &lt;grin&gt;</P>
<P>&nbsp;</P>
<H4>15 November 2003</H4>
<P>Lots of updates and changes. There's a <A=20
href=3D"http://www.frankvh.com/mp3player/software.htm">new software =
drop</A>. This=20
one includes a menu structure, and has a menu function for changing the =
output=20
audio level of the player.</P>
<P>Lots of website changes. Blank PCBs and a couple of ICs are now =
available on=20
the <A href=3D"http://www.frankvh.com/mp3player/kits.htm">kits &amp; =
parts</A>=20
page. There a new page describing some<A=20
href=3D"http://www.frankvh.com/mp3player/powersupply.htm"> player =
power-supply=20
considerations</A>. There's a new page amalgamating a lot of the<A=20
href=3D"http://www.frankvh.com/mp3player/avrprog.htm"> AVR programming=20
information</A>. Most existing pages have seen updates.</P>
<P>&nbsp;</P>
<H4>8 November 2003</H4>
<P>We now have on-line ordering! Hooray; check it out on the <A=20
href=3D"http://www.frankvh.com/mp3player/kits.htm">kits &amp; parts</A> =
page. </P>
<P>The first kit has been mailed. Rather historic really. More are in =
the=20
pipeline. I'e run out of PCBs and have placed an order for 25 more; =
they'll be=20
here in 2 weeks time.</P>
<P>I will hopefully add photos of the kits in the next couple of =
weeks.</P>
<P>I've been working on a menu system for the player software. I've made =
some=20
progress; I'll post updated software files once it's all working.</P>
<P>&nbsp;</P>
<H4>30 October 2003</H4>
<P>A few small changes to the site, mainly to the <A=20
href=3D"http://www.frankvh.com/mp3player/kits.htm">kits</A> page. Note =
that the=20
first "test the purchasing system" kit order will be bundled out the =
door in the=20
next week or so; this one is heading across the Pacific. If you're =
wanting a=20
kit, on-line ordering is coming very soon. Or just <A=20
href=3D"http://www.frankvh.com/mp3player/contact.htm">email me</A>.</P>
<P>&nbsp;</P>
<P>
<P>
<H4>26 October 2003</H4>
<P>Made the website change I've been wanting to do for months: got rid =
of the=20
frames! And heavily moved the structure to CSS. This new format is much =
easier=20
for me to maintain, and (in my opinion) already looks better than the =
old=20
version did. I really need to make a better "MP3" logo though... If you =
have any=20
problems reading the website please let me know! </P>
<P>&nbsp;</P>
<H4>22 October 2003</H4>
<P>Some photos of the rev 2 PCB are now up! Take a look at the front =
page (of=20
course) as well as the construction notes page.</P>
<P>&nbsp;</P>
<H4>19 October 2003</H4>
<P>Added the <A href=3D"http://www.frankvh.com/mp3player/kits.htm"=20
target=3D_self>Kits &amp; Parts</A> page to start answering the =
questions I've=20
been receiving about obtaining a kit. Updated the <A=20
href=3D"http://www.frankvh.com/mp3player/buildnotes.htm" =
target=3D_self>Construction=20
Notes</A> page slightly. I've started working on a menu system for the =
player;=20
in the process I upgraded to the latest version of <A=20
href=3D"http://winavr.sourceforge.net/" target=3D_top>WinAVR</A> and =
discovered my=20
makefile no longer worked. If you're also getting an error message from =
the=20
make, open makefile with a text editor. About 2/3rds of the way down =
there's a=20
section saying "Create COFF format file from ELF output file." Comment =
out the=20
next two lines (ie put # in front of them). That's all you need to do; =
the COFF=20
file isn't used in this project anyway. I'll post an updated set of =
sources=20
sometime soon; for now this will work fine. Finally, I'm hoping to get =
some=20
photos of the rev 2 board in the coming week.</P>
<P>&nbsp;</P>
<H4>7 October 2003</H4>
<P>The schematics have been updated with a few new component values as a =
result=20
of the recent testing. There are still no wiremods on the board and at =
this=20
point I don't expect to have any. Continued testing is turning up no =
problems.=20
Even the USB 2.0 interface is proving to be rock-solid to date. I spent =
some=20
time on the weekend deleting a whole bunch of obsoleted routines from =
the source=20
code; the new sources are now posted on the software page. The source is =

slightly easier to wade through now that there are a few less excess =
routines in=20
there. I've posted a PDF version of a PowerPoint presentation giving an =
overview=20
of the project. This can be found on the front page. To-do are some =
updated=20
pictures (particularly showing the USB interface and the LCD =
backlighting).</P>
<P>&nbsp;</P>
<H4>4 October 2003</H4>
<P>Construction of the rev 2 PCB is complete and testing is going very =
well.=20
It's playing music and it's transferring data through the USB 2.0 port. =
Wow,=20
what an improvement this USB port is compared to the rev 1 board. Not =
only is it=20
much faster, but it's also proving to be reliable; just plug it in and =
it works.=20
The software has been updated to support the new board and has now been =
posted=20
on this website! There have been some minor schematic changes (component =
value=20
changes only; no wiremods on this PCB :-) and I'll be posting updated =