Bit Angle Modulation (BAM) in a PIC

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  1. - 9th March 2010, 15:53 #11
    Mike, K8LH's Avatar
    Mike, K8LH
    Mike, K8LH is offline Member
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    Hi Terry, K9HA,

    Attached is assembler source with "gamma" table. I also slowed down LED "0" fade loop time considerably to look for "stair stepping" effect since I was only using 64 "gamma" steps but the fading is remarkably smooth.

    I'm using Fairchild MV57164 Bar/Dot displays but almost any LED should work fine.

    A couple observations;

    (1) I'm very surprised at the light produced from LED "10" which is set to a duty cycle of 1 (1-usec -> 1/1280th or 0.078125% duty cycle).
    (2) Mirrored BAM doesn't seem to be necessary to correct the 127-128 duty cycle transition visual artifact when using a multiplexed display (with gaps between LED updates).

    Regards and "very 73", Mike, K8LH
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    Last edited by Mike, K8LH; - 9th March 2010 at 16:02.
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