Bit Angle Modulation (BAM) in a PIC

[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

[Bruce]

Very smooth fading effect. Nice job DT.

[Darrel Taylor]

Thank you Bruce!

And thanks for the Cylon Scanner.

I mentioned it earlier, and I did end up using the Cylon program we were playing with a while back.

To get the Mirror Image, it scans back and forth just like we had it. Then it uses that to mask the current bit in the dutycycles. It really knocked the code size down.

I used your Cylon version, of course.
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[gmglickman]

Ioannis:

You might want to remap the LED's brightness curve to compensate for the non-linearity in perceived brightness.

This are the values I use

data @$0, $00,$00,$01,$01,$01,$01,$02,$02,$02,$03,$03,$03,$04,$04,$04,$04,$05,$05,$05,$06,$06,$06,$07,$07,$07,$08,$08,$08,$09,$09,$0A,$0A
data      $0A,$0B,$0B,$0B,$0C,$0C,$0C,$0D,$0D,$0E,$0E,$0E,$0F,$0F,$10,$10,$10,$11,$11,$12,$12,$13,$13,$13,$14,$14,$15,$15,$16,$16,$16,$17
data      $17,$18,$18,$19,$19,$1A,$1A,$1B,$1B,$1C,$1C,$1D,$1D,$1E,$1E,$1F,$1F,$20,$20,$21,$21,$22,$23,$23,$24,$24,$25,$25,$26,$27,$27,$28
data      $28,$29,$2A,$2A,$2B,$2B,$2C,$2D,$2D,$2E,$2F,$2F,$30,$31,$31,$32,$33,$33,$34,$35,$35,$36,$37,$37,$38,$39,$3A,$3A,$3B,$3C,$3D,$3D
data      $3E,$3F,$40,$40,$41,$42,$43,$44,$44,$45,$46,$47,$48,$49,$49,$4A,$4B,$4C,$4D,$4E,$4F,$50,$51,$51,$52,$53,$54,$55,$56,$57,$58,$59
data      $5A,$5B,$5C,$5D,$5E,$5F,$60,$61,$62,$63,$64,$65,$67,$68,$69,$6A,$6B,$6C,$6D,$6E,$6F,$71,$72,$73,$74,$75,$77,$78,$79,$7A,$7B,$7D
data      $7E,$7F,$81,$82,$83,$84,$86,$87,$89,$8A,$8B,$8D,$8E,$8F,$91,$92,$94,$95,$97,$98,$9A,$9B,$9D,$9E,$A0,$A1,$A3,$A4,$A6,$A7,$A9,$AB
data      $AC,$AE,$B0,$B1,$B3,$B5,$B6,$B8,$BA,$BB,$BD,$BF,$C1,$C3,$C4,$C6,$C8,$CA,$CC,$CE,$D0,$D1,$D3,$D5,$D7,$D9,$DB,$DD,$DF,$E1,$E3,$E6

Then just

READ LED, LED

[Ioannis]

Hi gmglickman,

Hmm, nice, thanks for the post. I was thinking more complicated on this!

Ioannis

[Caius1]

Hi,

I came across this topic when browsing for BAM.

Regarding the blink can you verify that the blink still occurs when:
1 The last value of the period = 2^nBits - 2 instead of 2^nBits-1
2 New value is only updated at the start of a pwm period.

It would seem strange to me if it does.
I think that a blink can only occur form value=0 to value=x

Thanks