Bit Angle Modulation (BAM) in a PIC

[Darrel Taylor]

<img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=3157&stc=1&d=123328553 8" />

Had that come up first, I woud have tried it. Looks interesting.

But the mirror image seems to work great, so no reason to change horses just yet.

There's 3 of our regular members looking at it now.
I like knowing they can set CONFIGs and disable A/D on their own.

Barring any problems, I'll post it soon.
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[Darrel Taylor]

After realizing that Pebbles is probably 60-70 years old by now ...
I'm not so interested in BAMBAM anymore.

The name has been changed to MIBAM. (Mirror Imaged Bit Angle Modulation)

And the code for PicBasic Pro is now available here ...
http://www.picbasic.co.uk/forum/showthread.php?t=10564

Cheers,

[Ioannis]

Hi Darrel.

I am testing your code on a 887 chip at 20MHz.

I am stuck on this error:

Error[115] c:\pbp\mibam-~1.asm 223 : Duplicate label ("BAM_PIN" or redefining symbol that cannot be redefined)
Error[115] c:\pbp\mibam-~1.asm 224 : Duplicate label ("BAM_PIN" or redefining symbol that cannot be redefined)
Error[115] c:\pbp\mibam-~1.asm 225 : Duplicate label ("BAM_PIN" or redefining symbol that cannot be redefined)
Error[115] c:\pbp\mibam-~1.asm 226 : Duplicate label ("BAM_PIN" or redefining symbol that cannot be redefined).

In fact, the code is a copy of the example. Nothing more or less. Of course the part about wsave is included too. Attached is the final test code.

Regards,
Ioannis

[Darrel Taylor]

Duplicate label ("BAM_PIN" or redefining symbol that cannot be redefined)

In MicroCode Sudio, View | Compile and Program Options | Compiler Tab ...

Check the "Case sensitive" box.
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[Ioannis]

Yep, thats it.

One word describes this software.

A M A Z I N G !

Congratulations Darrel!

Only leds were more linear devices...

Thanks a lot.

Ioannis

P.S. About the case sensitivity, is this going to have any side effects on other programs that I develop? Why did that happen right now?

[Darrel Taylor]

One word describes this software.
<script language="JavaScript" src="http://www.pbpgroup.com/js/ColorText.js"></script>
<div id="DTtext"><b>A M A Z I N G !</b></div>
<script>ColorText("DTtext",['red','green','blue','magenta','cyan','black']);</script>

Thanks Ioannis, and I ... uh ... may have embellished your quote a little. (Shameless )

P.S. About the case sensitivity, is this going to have any side effects on other programs that I develop?

I guess that depends on how much ASM code you've been writing.

The default for MPASM is "Case Sensitive".
The default for MicroCode Studio is "Case Sensitive".
So somewhere along the way, you've changed the setting in MCS, and it may or may not have solved your problem at the time. Sometimes you just try things ... grasping for answers.

Why did that happen right now?

Because I chose to use tricky things that require case sensitivity.

The sensitivity option has no effect on PBP statements, since PBP isn't case sensitive to begin with.
And there are some ASM problems that can come up when un-checking the "Case sensitive" box, so I'd recommend leaving it checked at all times.

[Ioannis]

OK. Thanks for the explanation. I will keep the option checked for case sensitivity. I really cannot recall un-checking it...

About the Light intensity control, at least for small 5mm Leds, at low levels there is a problem because of the nature of the diodes. Of course it has nothing to do with the code you have developed.

I suppose that there should be a non-linear function to increse the current at low levels, maybe an exponential or geometric function. Some experimentation will be necessary.

Anyway, having 20 devices to control with a kind of PWM is fantastic.

Once again, you are #1!

Ioannis