algorithm

algoscroll.c

uint32_t offp,offi,x,y;
//printf("li%d:\n",line_width);
    y=ledtodisp/line_width;
    #if SNAKEPATTERN == 1
        if(y%2 == 0)
        {
            x=ledtodisp%line_width;
           // off=((x+startleds)%line_width)+y*line_width;
            offi=MOD(x+startleds,line_width)+y*line_width;
            #if ALTERNATEPATTERN == 1
                 offp=MOD(x-startleds,line_width)+y*line_width;
            #else
                 offp=offi;
            #endif

        }
        else
        {
            x=ledtodisp%line_width;
            //off=(line_width-x-startleds+1)%line_width+y*line_width;
            offi=MOD(x-startleds,line_width)+y*line_width;
            #if ALTERNATEPATTERN == 1
                offp=MOD(x+startleds,line_width)+y*line_width;
            #else
                offp=offi;
            #endif
        }

    #else
            x=ledtodisp%line_width;
            off=((x+startleds)%line_width)+y*line_width;
    #endif

    // uint8_t *poli = ledt + ((ledtodisp+startleds)%led_per_strip) * nbcomponents;
    offi=offi*nb_components;
    offp=offp*nb_components;
    uint8_t *poli = ledt + offp ;