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jaseg f037001053 Add local changes
2020-04-11 17:33:20 +02:00
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tools Firmware directory reorganization 2018-01-05 11:53:52 +01:00
.gitignore Now with working source extraction from firmware 2017-09-01 20:52:34 +02:00
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global.h Add local changes 2020-04-11 17:33:20 +02:00
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led.h Split project into individual source files and add license 2018-01-05 12:23:24 +01:00
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mac.c Firmware directory reorganization 2018-01-05 11:53:52 +01:00
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stm32_flash.ld Now with working source extraction from firmware 2017-09-01 20:52:34 +02:00
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transpose.h Add some documentation 2018-01-05 11:39:20 +01:00

README.rst

Note on the LED modulation

To control LED brightness, this project uses a modulation technique known as "Binary Code Modulation" (BCM) or "Bit Angle Modulation" (BAM). The base idea is to clock out all outputs in parallel bit-by-bit, then modulate this with a precisely timed output enable signal. In contrast to PWM this allows almost arbitrarily high channel counts and configurable modulation resolution at low CPU overhead and high frame rates. In this project that is needed due to the large number of channels (32) and the medium oversampling rate (1:8).

A good article explaining BCM can be found on batsocks.co.uk and a nice video explaining has been published by mikeselectricstuff. A possible optimization for even smoother brightness fading (probably mostly in unmultiplexed applications) has been discussed in the forums at picbasic.co.uk.