DOG-M081 läuft nicht - was habe ich falsch gemacht?

Hi zusammen,

ich versuche seit 3 Tagen mein DOGM081 1-Zeilen Display im 4-Bit Mode 
zum laufen zu bekommen. Kann jemand mal einen Blick auf meinen Code 
werfen...

Nach der Init blinkt noch nichtmal der Cursor..

D7-D4 ist das high-nibble von PORTB. DAS low-nibble vom Port ist nicht 
belegt.

RW, CS, und RS sind an PORTA.



defpin_RW = 0;
defpin_RS = 0;
defpin_CS = 0;
delay(1000);

PORTB = 0b.0011.0000; defpin_CS = 1; delay(1); defpin_CS = 0; 
delay(500);
PORTB = 0b.0011.0000; defpin_CS = 1; delay(1); defpin_CS = 0; delay(50);
PORTB = 0b.0011.0000; defpin_CS = 1; delay(1); defpin_CS = 0; delay(50);
PORTB = 0b.0010.0000; defpin_CS = 1; delay(1); defpin_CS = 0; delay(50);

PORTB = 0b.0010.0000; defpin_CS = 1; delay(1); defpin_CS = 0; delay(50);
PORTB = 0b.1001.0000; defpin_CS = 1; delay(1); defpin_CS = 0; delay(50); 
// Function Set

PORTB = 0b.0001.0000; defpin_CS = 1; delay(1); defpin_CS = 0; delay(50);
PORTB = 0b.1100.0000; defpin_CS = 1; delay(1); defpin_CS = 0; delay(50); 
// Internal OSC

PORTB = 0b.0111.0000; defpin_CS = 1; delay(1); defpin_CS = 0; delay(50);
PORTB = 0b.1000.0000; defpin_CS = 1; delay(1); defpin_CS = 0; delay(50); 
// Contrast

PORTB = 0b.0101.0000; defpin_CS = 1; delay(1); defpin_CS = 0; delay(50);
PORTB = 0b.1110.0000; defpin_CS = 1; delay(1); defpin_CS = 0; delay(50); 
// Power/ICON/Contrast

PORTB = 0b.0110.0000; defpin_CS = 1; delay(1); defpin_CS = 0; delay(50);
PORTB = 0b.1010.0000; defpin_CS = 1; delay(1); defpin_CS = 0; delay(50); 
// Follower

PORTB = 0b.0000.0000; defpin_CS = 1; delay(1); defpin_CS = 0; delay(50);
PORTB = 0b.1111.0000; defpin_CS = 1; delay(1); defpin_CS = 0; delay(50); 
// Display On OFF

PORTB = 0b.0000.0000; defpin_CS = 1; delay(1); defpin_CS = 0; delay(50);
PORTB = 0b.0001.0000; defpin_CS = 1; delay(1); defpin_CS = 0; delay(50); 
// Clear

PORTB = 0b.0000.0000; defpin_CS = 1; delay(1); defpin_CS = 0; delay(50);
PORTB = 0b.0110.0000; defpin_CS = 1; delay(1); defpin_CS = 0; delay(50); 
// Entry Mode

defpin_RS = 1;
PORTB = 0b.0101.0000; defpin_CS = 1; delay(1); defpin_CS = 0; delay(50);
PORTB = 0b.0110.0000; defpin_CS = 1; delay(1); defpin_CS = 0; delay(50); 
// Zeichen senden "V"