w2812 attiny2313

//  ATtiny2313 12MHz

#define L_BIT    PORTB &= ~(1<<0)
#define H_BIT    PORTB |=  (1<<0)    
#define LED_MAX  4

unsigned long dat[LED_MAX];
byte aa,bb,cc;

void setup(){
   DDRB |= (1<<0);
}

void loop(){
/////////////////
  for(int i1=LED_MAX;i1>=0;i1--){
  for(int i=0;i<100;i++){
   switch(i1){
    case 0:  aa=i;bb=0;cc=0;break;
    case 1:  aa=0;bb=i;cc=0;break;
    case 2:  aa=0;bb=0;cc=i;break;
    case 3:  aa=i;bb=i;cc=i;break;
    }
  data_led(i1,  aa,bb,cc);
  led_rgb();res();
  delay(2);
  }}

  for(int i1=0;i1<LED_MAX;i1++){
  for(int i=100;i>=0;i--){
   switch(i1){
    case 0:  aa=i;bb=0;cc=0;break;
    case 1:  aa=0;bb=i;cc=0;break;
    case 2:  aa=0;bb=0;cc=i;break;
    case 3:  aa=i;bb=i;cc=i;break;
    }
  data_led(i1,  aa,bb,cc);
  led_rgb();res();
  delay(2);
  }}
 delay(50);
///////////////////

  for(int i1=0;i1<LED_MAX;i1++){
  for(int i=0;i<100;i++){
   switch(i1){
    case 0:  aa=i;bb=0;cc=0;break;
    case 1:  aa=0;bb=i;cc=0;break;
    case 2:  aa=0;bb=0;cc=i;break;
    case 3:  aa=i;bb=i;cc=i;break;
    }
  data_led(i1,  aa,bb,cc);
  led_rgb();res();
  delay(2);
  }}

  for(int i1=LED_MAX;i1>=0;i1--){
  for(int i=100;i>=0;i--){
   switch(i1){
    case 0:  aa=i;bb=0;cc=0;break;
    case 1:  aa=0;bb=i;cc=0;break;
    case 2:  aa=0;bb=0;cc=i;break;
    case 3:  aa=i;bb=i;cc=i;break;
    }
  data_led(i1,  aa,bb,cc);
  led_rgb();res();
  delay(2);
  }}
 delay(50);
 ////////////////////////

}

void bit_0(){H_BIT;asm("nop");   L_BIT;asm("nop");asm("nop");}
void bit_1(){H_BIT;asm("nop");asm("nop");asm("nop");asm("nop");  L_BIT;}
void bit_w(bool x){if(x) bit_1(); else bit_0();}
void res(){delayMicroseconds(100);}

void data_led(int num, unsigned long rrr, int ggg, byte bbb){
  dat[num] = ((rrr << 16) & 0xFF0000) + ((ggg << 8) & 0xFF00) + bbb;
  }

void led_rgb(){
  for(unsigned char num_i=0;num_i<LED_MAX;num_i++){unsigned long data=dat[num_i];
  cli();
bit_w(data & 0x80);
bit_w(data & 0x40);
bit_w(data & 0x20);
bit_w(data & 0x10);
bit_w(data & 0x08);
bit_w(data & 0x04);
bit_w(data & 0x02);
bit_w(data & 0x01);
bit_w(data & 0x800000);
bit_w(data & 0x400000);
bit_w(data & 0x200000);
bit_w(data & 0x100000);
bit_w(data & 0x080000);
bit_w(data & 0x040000);
bit_w(data & 0x020000);
bit_w(data & 0x010000);  
bit_w(data & 0x8000);    
bit_w(data & 0x4000);    
bit_w(data & 0x2000);    
bit_w(data & 0x1000);    
bit_w(data & 0x0800);    
bit_w(data & 0x0400);    
bit_w(data & 0x0200);    
bit_w(data & 0x0100); 
   sei(); 
delayMicroseconds(10);
}}