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Only update LED strip when necessary

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This commit is contained in:
Thomas Kolb 2015-10-10 15:35:02 +02:00
parent 0518f0e184
commit fc33207e8f
1 changed files with 25 additions and 5 deletions
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28
src/fader.c
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@ -11,6 +11,8 @@ uint8_t numModules;
float fadestep = 1; float fadestep = 1;
double nextFrame; double nextFrame;
int somethingChanged = 0; // indicates when a ws2801 update is required
static const double interval = 0.01f; static const double interval = 0.01f;
struct Colour { struct Colour {
@ -59,6 +61,8 @@ void fader_set_colour(uint8_t module, uint8_t r, uint8_t g, uint8_t b)
curColour[module].red = targetColour[module].red = r; curColour[module].red = targetColour[module].red = r;
curColour[module].green = targetColour[module].green = g; curColour[module].green = targetColour[module].green = g;
curColour[module].blue = targetColour[module].blue = b; curColour[module].blue = targetColour[module].blue = b;
somethingChanged = 1;
} }
void fader_fade_colour(uint8_t module, uint8_t r, uint8_t g, uint8_t b) void fader_fade_colour(uint8_t module, uint8_t r, uint8_t g, uint8_t b)
@ -85,6 +89,8 @@ void fader_add_colour(uint8_t module, uint8_t r, uint8_t g, uint8_t b)
if(targetColour[module].red > 255) { targetColour[module].red = 255; } if(targetColour[module].red > 255) { targetColour[module].red = 255; }
if(targetColour[module].green > 255) { targetColour[module].green = 255; } if(targetColour[module].green > 255) { targetColour[module].green = 255; }
if(targetColour[module].blue > 255) { targetColour[module].blue = 255; } if(targetColour[module].blue > 255) { targetColour[module].blue = 255; }
somethingChanged = 1;
} }
void fader_set_fadestep(uint8_t newFadestep) void fader_set_fadestep(uint8_t newFadestep)
@ -94,7 +100,14 @@ void fader_set_fadestep(uint8_t newFadestep)
fadestep = (float)newFadestep * interval / 0.04f; fadestep = (float)newFadestep * interval / 0.04f;
} }
void fade_colour(float *cur, const float *target) /*!
* Fade the colour value in cur towards target.
*
* \param cur The colour value to update.
* \param target The target value that should be reached.
* \param changed Output value which is set to 1 if cur was changed.
*/
void fade_colour(float *cur, const float *target, int *changed)
{ {
float diff; float diff;
if(*cur > *target) { if(*cur > *target) {
@ -104,6 +117,8 @@ void fade_colour(float *cur, const float *target)
} else { } else {
*cur -= fadestep; *cur -= fadestep;
} }
*changed = 1;
} else if(*cur < *target) { } else if(*cur < *target) {
diff = *target - *cur; diff = *target - *cur;
if(diff < fadestep) { if(diff < fadestep) {
@ -111,15 +126,17 @@ void fade_colour(float *cur, const float *target)
} else { } else {
*cur += fadestep; *cur += fadestep;
} }
*changed = 1;
} }
} }
void fader_update(void) void fader_update(void)
{ {
for(uint8_t i = 0; i < numModules; i++) { for(uint8_t i = 0; i < numModules; i++) {
fade_colour(&(curColour[i].red), &(targetColour[i].red)); fade_colour(&(curColour[i].red), &(targetColour[i].red), &somethingChanged);
fade_colour(&(curColour[i].green), &(targetColour[i].green)); fade_colour(&(curColour[i].green), &(targetColour[i].green), &somethingChanged);
fade_colour(&(curColour[i].blue), &(targetColour[i].blue)); fade_colour(&(curColour[i].blue), &(targetColour[i].blue), &somethingChanged);
ws2801_set_colour(i, ws2801_set_colour(i,
(uint8_t)curColour[i].red, (uint8_t)curColour[i].red,
@ -127,7 +144,10 @@ void fader_update(void)
(uint8_t)curColour[i].blue); (uint8_t)curColour[i].blue);
} }
if(somethingChanged) {
ws2801_send_update(); ws2801_send_update();
somethingChanged = 0;
}
} }
void fader_wait_frame(void) void fader_wait_frame(void)