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added function to set only one color channel without touching the others #82

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added function to set only one color channel without touching the others #82

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8b4c6f3
added function to set only one color channel without touching the others
gregersn Nov 2, 2015
82ca1af
Merge https://github.com/adafruit/Adafruit_NeoPixel
gregersn Dec 23, 2015
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30 changes: 30 additions & 0 deletions Adafruit_NeoPixel.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1195,6 +1195,36 @@ void Adafruit_NeoPixel::setPixelColor(uint16_t n, uint32_t c) {
}
}

// Set the r, g or b value of a single pixel
void Adafruit_NeoPixel::setPixelChannel(uint16_t n, uint8_t v, uint8_t c) {
// set channel (red, green or blue) 'c' of pixel n to value v
if(n < numLEDs) {
uint8_t *p;
uint8_t offset;
if(c == 0) {
offset = rOffset;
} else if(c == 1) {
offset = gOffset;
} else if(c == 2) {
offset = bOffset;
} else {
return;
}

if(wOffset == rOffset) {
p = &pixels[n * 3];
} else {
p = &pixels[n * 4];
}
if(brightness) {
v = (v * brightness) >> 8;
}

p[offset] = v;

}
}

// Convert separate R,G,B into packed 32-bit RGB color.
// Packed format is always RGB, regardless of LED strand color order.
uint32_t Adafruit_NeoPixel::Color(uint8_t r, uint8_t g, uint8_t b) {
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1 change: 1 addition & 0 deletions Adafruit_NeoPixel.h
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Expand Up @@ -129,6 +129,7 @@ class Adafruit_NeoPixel {
setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b),
setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b, uint8_t w),
setPixelColor(uint16_t n, uint32_t c),
setPixelChannel(uint16_t n, uint8_t v, uint8_t c),
setBrightness(uint8_t),
clear(),
updateLength(uint16_t n),
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