Ah, da hatte ich ins falsche Array gefasst...
YES, super, das funktioniert jetzt!
Karma +1 für alle hilfreichen Tipgeber und herzliche Grüße in die Runde. Macht echt Spaß mit Euch.
Helmuth
@Eisebaer: Die Log Tabelle baue ich morgen ein.
Für alle, die mitspielen wollen, hier nochmal der aktuelle Code: Ein Fade von einem Zufallsmuster zu einem Rot-Blau Verlauf und zurück...sieht ziemlich gut und echt smooth aus, selbst mit den nur 15 Bit vom 1101.
Na dann kann ja jetzt das Effekte Programmieren losgehen... 
#include <FastSPI_LED.h>
//that is the length of your strip
#define NUM_LEDS 20
//change the order of your rgb here
struct CRGB { unsigned char r; unsigned char g; unsigned char b; };
struct CRGB *leds;
//to save, what you see right now (current frame)
byte old_frame[NUM_LEDS][3];
//to store, what you want to see in future (next frame)
byte new_frame[NUM_LEDS][3];
//some tools first:
//set color of a single LED, don´t show
void set_color_led(int adex, int cred, int cgrn, int cblu) {
leds[adex].r = cred;
leds[adex].g = cgrn;
leds[adex].b = cblu;
}
//save what you see right now to old_frame for playing with it later
void copy_led_array_to_old_frame(){
for(int i = 0; i < NUM_LEDS; i++ ) {
old_frame[i][0] = leds[i].r;
old_frame[i][1] = leds[i].g;
old_frame[i][2] = leds[i].b;
}
}
//show something unique
void create_random_pixels(){ //show something unique
for(int i = 0 ; i < NUM_LEDS; i++ ) {
set_color_led(i, random(255), random(255), random(255));
}
FastSPI_LED.show();
}
//fill new_frame with some linear color fade
void fill_new_frame_with_content(){ //some linear fade
for(int i = 0 ; i < NUM_LEDS; i++ ) {
new_frame[i][0] = i*(255/NUM_LEDS);
new_frame[i][1] = 255-(i*(255/NUM_LEDS));
new_frame[i][2] = 0;
}
}
//make the content of new_frame visible
void show_new_frame(){
for(int i = 0 ; i < NUM_LEDS; i++ ) {
leds[i].r = new_frame[i][0];
leds[i].g = new_frame[i][1];
leds[i].b = new_frame[i][2];
}
FastSPI_LED.show();
}
//just to compare: show the frame you started with again
void show_old_frame(){
for(int i = 0 ; i < NUM_LEDS; i++ ) {
leds[i].r = old_frame[i][0];
leds[i].g = old_frame[i][1];
leds[i].b = old_frame[i][2];
}
FastSPI_LED.show();
}
//fade to new content over a numer of steps with wait_ms delay between the steps
void fade_from_old_to_new_frame(int steps, int wait_ms){
for(int a=0; a < steps; a++){ // over the steps
for(int b=0; b < NUM_LEDS; b++){ // over the whole lenght
//modify red
if (old_frame[b][0] < new_frame[b][0])
{leds[b].r=old_frame[b][0]+(new_frame[b][0]-old_frame[b][0])*a/steps;}
if (old_frame[b][0] > new_frame[b][0])
{leds[b].r=old_frame[b][0]-(old_frame[b][0]-new_frame[b][0])*a/steps;}
//modify green
if (old_frame[b][1] < new_frame[b][1])
{leds[b].g=old_frame[b][1]+(new_frame[b][1]-old_frame[b][1])*a/steps;}
if (old_frame[b][1] > new_frame[b][1])
{leds[b].g=old_frame[b][1]-(old_frame[b][1]-new_frame[b][1])*a/steps;}
//and blue
if (old_frame[b][2] < new_frame[b][2])
{leds[b].b=old_frame[b][2]+(new_frame[b][2]-old_frame[b][2])*a/steps;}
if (old_frame[b][2] > new_frame[b][2])
{leds[b].b=old_frame[b][2]-(old_frame[b][2]-new_frame[b][2])*a/steps;}
}
FastSPI_LED.show();
delay(wait_ms);
}
}
void fill_new_frame_with_random_pixels(){
for(int i = 0 ; i < NUM_LEDS; i++ ) {
new_frame[i][0] = random(255);
new_frame[i][1] = random(255);
new_frame[i][2] = random(255);
}
}
void setup(){
FastSPI_LED.setLeds(NUM_LEDS);
//select your chipset according to your strip type here - have a look at FastSPI documentation
//i´m using a LPD1101 right know who behaves like a LPD6803
FastSPI_LED.setChipset(CFastSPI_LED::SPI_LPD6803);
FastSPI_LED.init();
FastSPI_LED.start();
leds = (struct CRGB*)FastSPI_LED.getRGBData();
create_random_pixels();
}
void loop() {
/* just for testing
create_random_pixels();
copy_led_array_to_old_frame();
delay(1000);
fill_new_frame_with_content();
show_new_frame();
delay(1000);
show_old_frame();
delay(1000);
show_new_frame();
delay(1000);
ok, that seems to work so far*/
copy_led_array_to_old_frame();
fill_new_frame_with_content();
fade_from_old_to_new_frame(100,50);
//delay(1000);
copy_led_array_to_old_frame();
fill_new_frame_with_random_pixels();
fade_from_old_to_new_frame(100,10);
//delay(1000);
}