ricklon / ckws2812

ws2812 library for chipKIT

ckWS2812

ws2812 library for chipKIT

ckws2812's Issues

Mz support

waiting for MZ support for Chipkit Wi-Fire

Thanks!

Crash with < 14 LEDs (CDEVICES value) prevents small numbers of LEDs from working

It turns out that if you have CDEVICES set less than 14 then updateLEDs() will never return true.

To test this out, take LBling example and set CDEVICES to 13 (and comment out an appropriate number of initializes in rgGRB[]) and run. No LED data will be output and the state will be stuck in LOADPAT forever.

Interestingly this is not as simple as it seams. You CAN use CDEVICES < 14, but the cDevices parameter to the begin() call must be less than the cbPatternBuffer parameter (not equal, as they normally are). Why 14 is the magic number where these things can be equal, I have no idea.

For example, if CDEVICES = 4,
ws2812.begin(3, rgbPatternBuffer, sizeof(rgbPatternBuffer), false)
will work but
ws2812.begin(4, rgbPatternBuffer, sizeof(rgbPatternBuffer), false)
will not work.

I have tried parsing the code to figure out why this happens, but I haven't figure out exactly how the DMA an pattern buffers work yet, so I can't see the forest for the trees at this point.

*Brian