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Shift neopixel bit pattern

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On some processors, MOSI can be driven to the output level before
the clock is enabled. If the first bit is a 1, this can result in
a longer pulse that is interpreted as a high level by neopixels.

This fix maintains the same inter-bit timings, but ensures the
first bit is always 0. (The last bit is already always zero due
to padding for reset timing requirements).
This commit is contained in:
Jon Escombe
2024-10-25 12:08:16 +01:00
parent ee8eb2c1eb
commit 15a4e2ab24
1 changed files with 6 additions and 6 deletions
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12
rgb.h
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@@ -131,11 +131,11 @@ static inline void rgb_3bpp_pack (uint8_t *led, rgb_color_t color, rgb_color_ma
do {
R <<= 3;
R |= color.R & bitmask ? 0b110 : 0b100;
R |= color.R & bitmask ? 0b011 : 0b010;
G <<= 3;
G |= color.G & bitmask ? 0b110 : 0b100;
G |= color.G & bitmask ? 0b011 : 0b010;
B <<= 3;
B |= color.B & bitmask ? 0b110 : 0b100;
B |= color.B & bitmask ? 0b011 : 0b010;
} while(bitmask >>= 1);
if(mask.G) {
@@ -179,13 +179,13 @@ static inline rgb_color_t rgb_3bpp_unpack (uint8_t *led, uint8_t intensity)
B |= *led;
do {
if((R & 0b110) == 0b110)
if((R & 0b011) == 0b011)
color.R |= bitmask;
R >>= 3;
if((G & 0b110) == 0b110)
if((G & 0b011) == 0b011)
color.G |= bitmask;
G >>= 3;
if((B & 0b110) == 0b110)
if((B & 0b011) == 0b011)
color.B |= bitmask;
B >>= 3;
} while(bitmask <<= 1);