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F7 Fix Ledstrip

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This commit is contained in:
Sami Korhonen 2016-10-20 12:57:13 +03:00
parent 43cd6f1e7f
commit 573df69935
3 changed files with 20 additions and 20 deletions
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src/main/common/utils.h
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@ -50,6 +50,7 @@ http://resnet.uoregon.edu/~gurney_j/jmpc/bitwise.html
* https://groups.google.com/forum/?hl=en#!msg/comp.lang.c/attFnqwhvGk/sGBKXvIkY3AJ
* Return (v ? floor(log2(v)) : 0) when 0 <= v < 1<<[8, 16, 32, 64].
* Inefficient algorithm, intended for compile-time constants.
*/
#define LOG2_8BIT(v) (8 - 90/(((v)/4+14)|1) - 2/((v)/2+1))
#define LOG2_16BIT(v) (8*((v)>255) + LOG2_8BIT((v) >>8*((v)>255)))
#define LOG2_32BIT(v) (16*((v)>65535L) + LOG2_16BIT((v)*1L >>16*((v)>65535L)))