Gibt es noch Optimierungspotential? (Mega8 an 320x240 GLCD Textmodus)

[Besserwessi]

In C sehe ich das wenig Möglichkeiten zur Optimierung. Mit inline ASM könnte man ggf. noch etwas machen, vor allem beim (temp>>4). Die Funktion könnte man mit dem eher selten genutzten ASM Befehl swap deutlich schneller hinbekommen. Es würde mich wundern wenn der Compiler das erkennt. Ob noch mehr inline ASM sinnvoll ist, könnte man ggf. am ASM Code erkennen den der Compiler produziert. Es ist schon möglich das da noch einige Optimierungen möglich sind, sowohl in C als auch in ASM. Ein Punkt könnte die Form des Array-Zugriffs sein. Da könnte es schneller gehen, wenn man nur ein 1 Dim Array nutzt, und dafür beim schreiben in den Puffer etwas umrechnet - das muss nicht länger dauern, denn der Compiler muss an sich auf umrechnen.

Der Code für die Ausgabe ist aber auch noch nicht so lang, da könnte ggf. sogar die ganze Schleife noch als inline ASM machen.

[markusj]

Du möchtest nicht -O1 sondern -Os, da bei AVRs in der Regel die Geschwindigkeit mit der Größe korreliert. Probiers einfach Mal aus. Alternativ kannst du auch die richtig aggressiven Optimierungen anschalten und die Parameter zum Ausrollen von Schleifen modifizieren, dann geht der Code aber mit Sicherheit in die Breite.

mfG
Markus

[MisterMou]

Du möchtest nicht -O1 sondern -Os, da bei AVRs in der Regel die Geschwindigkeit mit der Größe korreliert. Probiers einfach Mal aus. Alternativ kannst du auch die richtig aggressiven Optimierungen anschalten und die Parameter zum Ausrollen von Schleifen modifizieren, dann geht der Code aber mit Sicherheit in die Breite.

Da muss ich dich enttäuschen.
-O1 ist schon die beste Lösung, sonst sinds gute 61Hz


Das mit dem swap Befehl stimmt.
Hab fix ne inline Funktion mit inline asm zusammengeworfen, das ergibt 66Hz
Bis jetzt war die 1d Array Lösung noch nicht schneller, aber ich bin dran.

[MagicWSmoke]

Mit inline ASM könnte man ggf. noch etwas machen, vor allem beim (temp>>4). Die Funktion könnte man mit dem eher selten genutzten ASM Befehl swap deutlich schneller hinbekommen. Es würde mich wundern wenn der Compiler das erkennt.

Darfst Dich wundern, erkennt er.

swap    r24
andi    r24,k0F
out     p15,r24

Da die Ausgabe für eine Zeile immer jeweils das erste Byte eines Zeichens, dann nächste Zeile das zweite, usw. ist, wäre eine andere Anordnung des Fonts vorteilhafter, weil dann weniger gerechnet werden müsste. Wenn also die erste Zeile eines beliebigen Zeichens linear über 256 Bytes Programmspeicher ansprechbar ist, fällt die Multiplikation mit 12 weg, die erforderlich ist um an die passende Stelle des Fonts zu gelangen.

Statt

const unsigned char schrift[256][12] PROGMEM ={

eine Anordnung

const unsigned char schrift[12][256] PROGMEM ={

Ein

temp=pgm_read_byte(&schrift[j][text[ln_ctr][row_ctr]]);

würde auf 71,7 Hz kommen. Keine Ahnung ob es sich lohnt die Tabelle dafür umzustellen.

Nachtrag:
Unter der Voraussetzung, dass die Fonttabelle [12][256] lautet, würde dies hier für 78,4 Hz sorgen, Optimierung -Os:

unsigned char *cptr;
// ...
cptr = &schrift[j][0];
   for( unsigned char row_ctr = 0; row_ctr < rows; row_ctr++)
   {
      temp=pgm_read_byte(cptr + text[ln_ctr][row_ctr]);
// ...

[MisterMou]

Krass, wie hast du die 71,7 Hz berechnet?
Ich hab deinen Vorschlag durchgearbeitet, komm jetzt auf 71,6 Hz.

Man gut, dass man als Programmierer sowas automatisieren kann

Ich hab das Gefühl wir kommen gut voran

Aktueller Stand:

/*
 *B0-CP
 *B1-LOAD
 *B2-FRAME
 *
 *C0-D0
 *C1-D1
 *C2-D2
 *C3-D3
 *
 *Mega8 @ 16MHz
 */ 

#define CP 0
#define LOAD 1
#define FRAME 2

#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>

//8x12 Schrift
//http://www.mikrocontroller.net/topic/54860
//Danke Benedikt!

const unsigned char schrift[12][256] PROGMEM ={
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x10,0x00,0x30,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x0C,0x30,0x00,0xC0,0x38,0x00,0x30,0x00,0xC0,0x00,0x10,0x60,0x00,0x78,0x0C,0x00,0x00,0x30,0x00,0xC0,0x30,0xC0,0x00,0x00,0xCC,0x00,0x3C,0x00,0x00,0x0E,0x0C,0x0C,0x0C,0x0C,0x00,0x76,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x24,0x55,0x6D,0x18,0x18,0x0C,0x78,0x60,0x00,0x66,0x66,0x00,0x66,0x00,0xCC,0x00,0x18,0x18,0x00,0x18,0x00,0x18,0x00,0x76,0x66,0x00,0x66,0x00,0x66,0x00,0x66,0x00,0xCC,0x00,0x78,0x00,0x60,0x00,0x18,0x78,0x00,0x18,0x00,0xFF,0x00,0x00,0x60,0xFF,0x18,0x00,0x78,0x60,0x00,0x76,0x00,0x00,0x00,0x18,0x78,0x60,0x06,0x18,0x00,0x0C,0x00,0x00,0x00,0xE0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},
{0x00,0x7E,0x7E,0x00,0x10,0x18,0x18,0x00,0x00,0x00,0x00,0x3E,0x3C,0x00,0x7F,0x00,0x80,0x02,0x18,0x66,0x7F,0x7E,0x00,0x18,0x18,0x18,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x66,0x6C,0x30,0x00,0x70,0x30,0x0C,0x60,0x00,0x00,0x00,0x00,0x00,0x00,0x7C,0x10,0x78,0x78,0x0C,0xFC,0x38,0xFE,0x78,0x78,0x00,0x00,0x0C,0x00,0x60,0x78,0x7C,0x30,0xFC,0x3C,0xF8,0xFE,0xFE,0x3C,0xCC,0x78,0x1E,0xE6,0xF0,0xC6,0xC6,0x38,0xFC,0x38,0xFC,0x78,0xFC,0xCC,0xCC,0xC6,0xCC,0xCC,0xFE,0x3C,0x00,0x3C,0x38,0x00,0x30,0x00,0xE0,0x00,0x1C,0x00,0x38,0x00,0xE0,0x18,0x0C,0xE0,0x78,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x1C,0x18,0xE0,0x73,0x00,0x78,0xCC,0x18,0x78,0xCC,0x60,0x6C,0x00,0x78,0xCC,0x60,0x6C,0x38,0x30,0xCC,0xCC,0x18,0x00,0x3E,0x78,0xCC,0x60,0x78,0x60,0x66,0xCC,0x00,0x00,0x66,0x3A,0x00,0x1B,0x18,0x18,0x18,0x18,0x76,0xDC,0x78,0x78,0x30,0x38,0x00,0x62,0x63,0x30,0x00,0x00,0x92,0xAA,0xDB,0x18,0x18,0x18,0xCC,0x30,0x38,0x66,0x66,0x00,0x66,0x30,0xCC,0x00,0x18,0x18,0x00,0x18,0x00,0x18,0x76,0xDC,0x66,0x00,0x66,0x00,0x66,0x00,0x66,0x00,0x30,0xF8,0xCC,0xCC,0x30,0xF0,0x30,0xCC,0xCC,0x18,0x00,0xFF,0x00,0x18,0x30,0xFF,0x30,0x78,0xCC,0x30,0x76,0xDC,0x00,0x00,0xF0,0x30,0xCC,0x30,0x0C,0x30,0xFC,0x18,0x00,0x00,0x00,0x33,0x7F,0x7E,0x00,0x00,0x3C,0xCC,0x00,0x30,0x78,0x78,0x00,0x00},
{0x00,0xC3,0xFF,0x44,0x38,0x3C,0x3C,0x00,0x00,0x00,0x00,0x0E,0x66,0x00,0x63,0x18,0xC0,0x06,0x3C,0x66,0xDB,0x63,0x00,0x3C,0x3C,0x18,0x00,0x00,0x00,0x00,0x10,0xFE,0x00,0x78,0x66,0x6C,0x7C,0x00,0xD8,0x30,0x18,0x30,0x00,0x00,0x00,0x00,0x00,0x02,0xC6,0x30,0xCC,0xCC,0x1C,0xC0,0x60,0xC6,0xCC,0xCC,0x00,0x00,0x18,0x00,0x30,0xCC,0xC6,0x78,0x66,0x66,0x6C,0x62,0x66,0x66,0xCC,0x30,0x0C,0x66,0x60,0xEE,0xC6,0x6C,0x66,0x6C,0x66,0xCC,0xB4,0xCC,0xCC,0xC6,0xCC,0xCC,0xCE,0x30,0x80,0x0C,0x6C,0x00,0x18,0x00,0x60,0x00,0x0C,0x00,0x6C,0x00,0x60,0x18,0x0C,0x60,0x18,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x18,0x30,0xDA,0x00,0xCC,0xCC,0x30,0xCC,0xCC,0x30,0x6C,0x00,0xCC,0xCC,0x30,0x6C,0x6C,0x18,0x00,0xCC,0x00,0x00,0x78,0xCC,0xCC,0x30,0xCC,0x30,0x66,0x00,0xCC,0x00,0x60,0x6C,0x00,0x18,0x30,0x30,0x30,0x30,0xDC,0x00,0xCC,0xCC,0x30,0x44,0x00,0xE6,0xE6,0x30,0x00,0x00,0x49,0x55,0xB6,0x18,0x18,0x00,0x00,0x00,0x44,0x66,0x66,0x00,0x66,0x30,0xCC,0x00,0x18,0x18,0x00,0x18,0x00,0x18,0xDC,0x00,0x66,0x00,0x66,0x00,0x66,0x00,0x66,0x00,0xD8,0x6C,0x00,0x00,0x00,0x30,0x00,0x00,0x00,0x18,0x00,0xFF,0x00,0x18,0x00,0xFF,0x00,0xCC,0x00,0x00,0xDC,0x00,0x00,0xE0,0x60,0x00,0x00,0x00,0x18,0x00,0x00,0x30,0x00,0x30,0x00,0x66,0xDB,0x63,0x30,0x00,0x66,0x00,0x00,0x70,0x0C,0x0C,0x00,0x00},
{0x00,0x81,0xFF,0xEE,0x7C,0x3C,0x7E,0x00,0x00,0x00,0x00,0x3A,0x66,0x00,0x7F,0xDB,0xE0,0x0E,0x7E,0x66,0xDB,0x30,0x00,0x7E,0x7E,0x18,0x18,0x30,0x00,0x24,0x10,0xFE,0x00,0x78,0x66,0xFE,0xC0,0xC4,0xD8,0x30,0x30,0x18,0x66,0x18,0x00,0x00,0x00,0x06,0xCE,0xF0,0xCC,0x0C,0x3C,0xC0,0xC0,0xC6,0xCC,0xCC,0x38,0x38,0x30,0x00,0x18,0x0C,0xC6,0xCC,0x66,0xC6,0x66,0x60,0x62,0xC6,0xCC,0x30,0x0C,0x6C,0x60,0xFE,0xE6,0xC6,0x66,0xC6,0x66,0xCC,0x30,0xCC,0xCC,0xC6,0xCC,0xCC,0x98,0x30,0xC0,0x0C,0xC6,0x00,0x00,0x00,0x60,0x00,0x0C,0x00,0x60,0x00,0x60,0x00,0x00,0x60,0x18,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x60,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x18,0x30,0xCE,0x10,0xCC,0x00,0x00,0x00,0x00,0x00,0x38,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x78,0xFC,0x00,0xD8,0x00,0x00,0x00,0x00,0x00,0x00,0x78,0xCC,0x00,0x60,0xCE,0x00,0x18,0x00,0x00,0x00,0x00,0x00,0xC6,0xCC,0xCC,0x00,0xBA,0x00,0x6C,0x6C,0x00,0x00,0x00,0x24,0xAA,0x6D,0x18,0x18,0x30,0x30,0x30,0xBA,0x66,0x66,0x00,0x66,0x78,0xCC,0x00,0x18,0x18,0x00,0x18,0x00,0x18,0x00,0x30,0x66,0x00,0x66,0x00,0x66,0x00,0x66,0x00,0x0C,0x66,0xFC,0xFC,0xFC,0x30,0x78,0x78,0x78,0x18,0x00,0xFF,0x00,0x18,0x78,0xFF,0x78,0xCC,0x78,0x78,0x00,0x78,0x00,0x60,0x7C,0xCC,0xCC,0xCC,0x00,0xCC,0x00,0x00,0x00,0x30,0x00,0x3C,0xDB,0x30,0x30,0x00,0x66,0x00,0x00,0x30,0x38,0x18,0xFC,0x00},
{0x00,0xA5,0xDB,0xFE,0xFE,0xFF,0xFF,0x00,0x00,0x00,0x00,0x72,0x66,0x00,0x63,0x7E,0xF8,0x3E,0x18,0x66,0xDB,0x3C,0x00,0x18,0x18,0x18,0x0C,0x60,0xC0,0x66,0x38,0x7C,0x00,0x78,0x24,0x6C,0xC0,0xCC,0x70,0x60,0x60,0x0C,0x3C,0x18,0x00,0x00,0x00,0x0C,0xDE,0x30,0x0C,0x0C,0x6C,0xC0,0xC0,0x06,0xCC,0xCC,0x38,0x38,0x60,0x7E,0x0C,0x18,0xDE,0xCC,0x66,0xC0,0x66,0x64,0x64,0xC0,0xCC,0x30,0x0C,0x6C,0x60,0xFE,0xF6,0xC6,0x66,0xC6,0x66,0xC0,0x30,0xCC,0xCC,0xC6,0x78,0xCC,0x18,0x30,0x60,0x0C,0x00,0x00,0x00,0x78,0x7C,0x78,0x7C,0x78,0x60,0x76,0x6C,0x78,0x3C,0x66,0x18,0xFC,0xF8,0x78,0xDC,0x76,0xEC,0x78,0xFC,0xCC,0xCC,0xC6,0xC6,0x66,0xFC,0x60,0x18,0x18,0x00,0x38,0xC0,0xCC,0x78,0x78,0x78,0x78,0xF8,0x78,0x78,0x78,0x78,0x78,0x78,0x78,0x78,0x78,0xC4,0xFE,0xD8,0x78,0x78,0x78,0xCC,0xCC,0x66,0xCC,0xCC,0x78,0x60,0xD6,0x00,0x7E,0x78,0x78,0x78,0xCC,0xF8,0xE6,0x7E,0x78,0x30,0xAA,0x00,0x78,0x78,0x30,0x33,0xCC,0x92,0x55,0xDB,0x18,0x18,0x78,0x78,0x78,0xA2,0xE6,0x66,0xFE,0xE6,0xCC,0x78,0x00,0x18,0x18,0x00,0x18,0x00,0x18,0x78,0x78,0x67,0x7F,0xE7,0xFF,0x67,0xFF,0xE7,0x00,0x06,0x66,0xC4,0xC4,0xC4,0x30,0x30,0x30,0x30,0x18,0x00,0xFF,0x00,0x18,0x30,0xFF,0xCC,0xD8,0xCC,0xCC,0x78,0xCC,0x66,0x7C,0x66,0xCC,0xCC,0xCC,0x66,0xCC,0x00,0x00,0x00,0xFC,0x00,0xF8,0xDB,0x3C,0x00,0x00,0x66,0x00,0x00,0x30,0x0C,0x30,0xFC,0x00},
{0x00,0x81,0xFF,0xFE,0xFE,0xE7,0xFF,0x00,0x00,0x00,0x00,0xF8,0x3C,0x00,0x63,0xE7,0xFE,0xFE,0x18,0x66,0x7B,0x66,0x00,0x18,0x18,0x18,0xFE,0xFE,0xC0,0xFF,0x38,0x7C,0x00,0x30,0x00,0x6C,0x78,0x18,0xFA,0x00,0x60,0x0C,0xFF,0x7E,0x00,0xFE,0x00,0x18,0xD6,0x30,0x18,0x38,0xCC,0xF8,0xF8,0x0C,0x78,0x7C,0x00,0x00,0xC0,0x00,0x06,0x30,0xDE,0xCC,0x7C,0xC0,0x66,0x7C,0x7C,0xC0,0xFC,0x30,0x0C,0x78,0x60,0xD6,0xFE,0xC6,0x7C,0xC6,0x7C,0x70,0x30,0xCC,0xCC,0xD6,0x30,0x78,0x30,0x30,0x30,0x0C,0x00,0x00,0x00,0x0C,0x66,0xCC,0xCC,0xCC,0xF8,0xCC,0x76,0x18,0x0C,0x6C,0x18,0xD6,0xCC,0xCC,0x66,0xCC,0x6E,0xCC,0x60,0xCC,0xCC,0xC6,0x6C,0x66,0x8C,0xC0,0x00,0x0C,0x00,0x6C,0xC0,0xCC,0xCC,0x0C,0x0C,0x0C,0x0C,0xCC,0xCC,0xCC,0xCC,0x18,0x18,0x18,0xCC,0xCC,0xC0,0x1B,0xFE,0xCC,0xCC,0xCC,0xCC,0xCC,0x66,0xCC,0xCC,0xCC,0xFC,0xD6,0xC6,0x18,0x0C,0x18,0xCC,0xCC,0xCC,0xF6,0x00,0x00,0x60,0xBA,0xFC,0x30,0x37,0x30,0x66,0x66,0x49,0xAA,0xB6,0x18,0xF8,0xCC,0xCC,0xCC,0xA2,0x06,0x66,0x06,0x06,0xC0,0xFC,0xF8,0x1F,0xFF,0xFF,0x1F,0xFF,0xFF,0x0C,0xCC,0x60,0x60,0x00,0x00,0x60,0x00,0x00,0xC6,0x7E,0xF6,0xC0,0xC0,0xC0,0xFC,0x30,0x30,0x30,0xF8,0x1F,0xFF,0x00,0x00,0x30,0xFF,0xCC,0xCC,0xCC,0xCC,0xCC,0xCC,0x66,0x66,0x66,0xCC,0xCC,0xCC,0x66,0xCC,0x00,0x00,0xFC,0x30,0xF8,0x37,0x7B,0x66,0xFC,0x00,0x3C,0x00,0x18,0x78,0x78,0x7C,0xFC,0x00},
{0x00,0xBD,0xC3,0xFE,0x7C,0xE7,0x7E,0x00,0x00,0x00,0x00,0xCC,0x18,0x00,0x63,0xE7,0xF8,0x3E,0x18,0x00,0x1B,0x66,0x00,0x18,0x18,0x18,0x0C,0x60,0xC0,0x66,0x7C,0x38,0x00,0x30,0x00,0x6C,0x0C,0x30,0xDE,0x00,0x60,0x0C,0x3C,0x18,0x00,0x00,0x00,0x30,0xF6,0x30,0x30,0x0C,0xFE,0x0C,0xCC,0x18,0xCC,0x18,0x00,0x00,0x60,0x7E,0x0C,0x30,0xDE,0xFC,0x66,0xC0,0x66,0x64,0x64,0xCE,0xCC,0x30,0xCC,0x6C,0x62,0xC6,0xDE,0xC6,0x60,0xCE,0x6C,0x18,0x30,0xCC,0xCC,0xD6,0x78,0x30,0x60,0x30,0x18,0x0C,0x00,0x00,0x00,0x7C,0x66,0xC0,0xCC,0xFC,0x60,0xCC,0x66,0x18,0x0C,0x78,0x18,0xD6,0xCC,0xCC,0x66,0xCC,0x76,0x60,0x60,0xCC,0xCC,0xD6,0x38,0x66,0x18,0x60,0x18,0x18,0x00,0xC6,0xC0,0xCC,0xFC,0x7C,0x7C,0x7C,0x7C,0xC0,0xFC,0xFC,0xFC,0x18,0x18,0x18,0xCC,0xCC,0xF8,0x7F,0xD8,0xCC,0xCC,0xCC,0xCC,0xCC,0x66,0xCC,0xCC,0xDC,0x60,0xD6,0x6C,0x18,0x7C,0x18,0xCC,0xCC,0xCC,0xDE,0xFE,0xFE,0xC0,0xB2,0x0C,0x6E,0x6F,0x78,0xCC,0x33,0x24,0x55,0x6D,0x18,0x18,0xCC,0xCC,0xCC,0xA2,0x06,0x66,0x06,0x06,0xC0,0x30,0x18,0x00,0x00,0x18,0x18,0x00,0x18,0x7C,0xCC,0x60,0x60,0x00,0x00,0x60,0x00,0x00,0x7C,0xC6,0x66,0xF8,0xF8,0xF8,0x00,0x30,0x30,0x30,0x00,0x18,0xFF,0xFF,0x18,0x30,0x00,0xCC,0xCC,0xCC,0xCC,0xCC,0xCC,0x66,0x66,0x66,0xCC,0xCC,0xCC,0x66,0x78,0x00,0x00,0x00,0x30,0x00,0x6F,0x1B,0x66,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFC,0x00},
{0x00,0x99,0xE7,0x7C,0x38,0x18,0x18,0x00,0x00,0x00,0x00,0xCC,0x7E,0x00,0x67,0x7E,0xE0,0x0E,0x7E,0x00,0x1B,0x3C,0xFE,0x7E,0x18,0x7E,0x18,0x30,0xFE,0x24,0x7C,0x38,0x00,0x00,0x00,0xFE,0x0C,0x60,0xCC,0x00,0x30,0x18,0x66,0x18,0x00,0x00,0x00,0x60,0xE6,0x30,0x60,0x0C,0x0C,0x0C,0xCC,0x30,0xCC,0x18,0x38,0x38,0x30,0x00,0x18,0x00,0xC0,0xCC,0x66,0xC6,0x66,0x60,0x60,0xC6,0xCC,0x30,0xCC,0x6C,0x66,0xC6,0xCE,0xC6,0x60,0xDE,0x66,0xCC,0x30,0xCC,0xCC,0x6C,0xCC,0x30,0x62,0x30,0x0C,0x0C,0x00,0x00,0x00,0xCC,0x66,0xC0,0xCC,0xC0,0x60,0xCC,0x66,0x18,0x0C,0x6C,0x18,0xD6,0xCC,0xCC,0x66,0xCC,0x60,0x18,0x60,0xCC,0xCC,0xD6,0x38,0x66,0x60,0x30,0x18,0x30,0x00,0xC6,0xCC,0xCC,0xC0,0xCC,0xCC,0xCC,0xCC,0xC0,0xC0,0xC0,0xC0,0x18,0x18,0x18,0xFC,0xFC,0xC0,0xD8,0xD8,0xCC,0xCC,0xCC,0xCC,0xCC,0x66,0xCC,0xCC,0xEC,0x60,0xE6,0x38,0x18,0xCC,0x18,0xCC,0xCC,0xCC,0xCE,0x00,0x00,0xC0,0xAA,0x0C,0xC3,0xDB,0x78,0xCC,0x33,0x92,0xAA,0xDB,0x18,0x18,0xFC,0xFC,0xFC,0xBA,0xE6,0x66,0xE6,0xFE,0xCC,0xFC,0x18,0x00,0x00,0x18,0x18,0x00,0x18,0xCC,0xFC,0x7F,0x67,0xFF,0xE7,0x67,0xFF,0xE7,0x6C,0xC6,0x66,0xC0,0xC0,0xC0,0x00,0x30,0x30,0x30,0x00,0x18,0xFF,0xFF,0x18,0x30,0x00,0xCC,0xCC,0xCC,0xCC,0xCC,0xCC,0x66,0x7C,0x7C,0xCC,0xCC,0xCC,0x66,0x30,0x00,0x00,0x00,0x00,0x00,0xDB,0x1B,0x3C,0x30,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFC,0x00},
{0x00,0xC3,0xFF,0x38,0x10,0x18,0x18,0x00,0x00,0x00,0x00,0xCC,0x18,0x00,0xE7,0xDB,0xC0,0x06,0x3C,0x66,0x1B,0x0C,0xFE,0x3C,0x18,0x3C,0x00,0x00,0x00,0x00,0xFE,0x10,0x00,0x30,0x00,0x6C,0xF8,0xCC,0xDC,0x00,0x18,0x30,0x00,0x00,0x38,0x00,0x38,0xC0,0xC6,0x30,0xCC,0xCC,0x0C,0xCC,0xCC,0x30,0xCC,0x30,0x38,0x38,0x18,0x00,0x30,0x30,0xC0,0xCC,0x66,0x66,0x6C,0x62,0x60,0x66,0xCC,0x30,0xCC,0x66,0x66,0xC6,0xC6,0x6C,0x60,0x7C,0x66,0xCC,0x30,0xCC,0x78,0x6C,0xCC,0x30,0xC6,0x30,0x06,0x0C,0x00,0x00,0x00,0xCC,0x66,0xCC,0xCC,0xCC,0x60,0x7C,0x66,0x18,0x0C,0x66,0x18,0xD6,0xCC,0xCC,0x66,0xCC,0x60,0xCC,0x6C,0xCC,0x78,0x6C,0x6C,0x3C,0xC4,0x30,0x18,0x30,0x00,0xFE,0xCC,0xCC,0xCC,0xCC,0xCC,0xCC,0xCC,0xCC,0xC0,0xC0,0xC0,0x18,0x18,0x18,0xCC,0xCC,0xC4,0xD8,0xD8,0xCC,0xCC,0xCC,0xCC,0xCC,0x3C,0xCC,0xCC,0xCC,0xC0,0x6C,0x6C,0xD8,0xCC,0x18,0xCC,0xCC,0xCC,0xC6,0x00,0x00,0xCC,0x44,0x0C,0x86,0xB3,0x78,0x66,0x66,0x49,0x55,0xB6,0x18,0x18,0xCC,0xCC,0xCC,0x44,0x66,0x66,0x66,0x00,0x78,0x30,0x18,0x00,0x00,0x18,0x18,0x00,0x18,0xCC,0xCC,0x00,0x66,0x00,0x66,0x66,0x00,0x66,0x7C,0xC6,0x6C,0xC4,0xC4,0xC4,0x00,0x30,0x30,0x30,0x00,0x18,0xFF,0xFF,0x18,0x30,0x00,0xCC,0xF8,0xCC,0xCC,0xCC,0xCC,0x66,0x60,0x60,0xCC,0xCC,0xCC,0x3C,0x30,0x00,0x00,0x00,0xFC,0xF8,0xB3,0x1B,0x0C,0x30,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFC,0x00},
{0x00,0x7E,0x7E,0x10,0x00,0x7E,0x7E,0x00,0x00,0x00,0x00,0x78,0x18,0x00,0xE6,0x18,0x80,0x02,0x18,0x66,0x1B,0xC6,0xFE,0x18,0x18,0x18,0x00,0x00,0x00,0x00,0xFE,0x10,0x00,0x30,0x00,0x6C,0x30,0x8C,0x76,0x00,0x0C,0x60,0x00,0x00,0x38,0x00,0x38,0x80,0x7C,0xFC,0xFC,0x78,0x1E,0x78,0x78,0x30,0x78,0x70,0x00,0x18,0x0C,0x00,0x60,0x30,0x7C,0xCC,0xFC,0x3C,0xF8,0xFE,0xF0,0x3E,0xCC,0x78,0x78,0xE6,0xFE,0xC6,0xC6,0x38,0xF0,0x0C,0xE6,0x78,0x78,0x78,0x30,0x6C,0xCC,0x78,0xFE,0x3C,0x02,0x3C,0x00,0x00,0x00,0x76,0xDC,0x78,0x76,0x78,0xF0,0x0C,0xE6,0x7E,0xCC,0xE6,0x7E,0xC6,0xCC,0x78,0x7C,0x7C,0xF0,0x78,0x38,0x76,0x30,0x6C,0xC6,0x0C,0xFC,0x1C,0x18,0xE0,0x00,0x00,0x78,0x76,0x78,0x76,0x76,0x76,0x76,0x78,0x7C,0x7C,0x7C,0x7E,0x7E,0x7E,0xCC,0xCC,0xFC,0xEF,0xDE,0x78,0x78,0x78,0x76,0x76,0x0C,0x78,0x78,0x78,0xFE,0xB8,0xC6,0x70,0x76,0x7E,0x78,0x76,0xCC,0xC6,0x00,0x00,0x78,0x38,0x00,0x0C,0x3F,0x30,0x33,0xCC,0x24,0xAA,0x6D,0x18,0x18,0xCC,0xCC,0xCC,0x38,0x66,0x66,0x66,0x00,0x30,0x30,0x18,0x00,0x00,0x18,0x18,0x00,0x18,0x76,0xCC,0x00,0x66,0x00,0x66,0x66,0x00,0x66,0xC6,0x7C,0xF8,0xFC,0xFC,0xFC,0x00,0x78,0x78,0x78,0x00,0x18,0xFF,0xFF,0x18,0x78,0x00,0x78,0xC0,0x78,0x78,0x78,0x78,0x7B,0xF0,0xF0,0x78,0x78,0x78,0x0C,0x78,0x00,0x00,0x00,0x00,0x00,0x3F,0x1B,0xC6,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x7E,0x00,0x7E,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x60,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x1E,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xCC,0x00,0x00,0xCC,0x00,0x00,0x00,0x00,0x00,0x60,0x0C,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x18,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x18,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x1F,0x03,0x00,0x00,0x00,0x92,0x55,0xDB,0x18,0x18,0x00,0x00,0x00,0x00,0x66,0x66,0x66,0x00,0x30,0x00,0x18,0x00,0x00,0x18,0x18,0x00,0x18,0x00,0x00,0x00,0x66,0x00,0x66,0x66,0x00,0x66,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x18,0xFF,0xFF,0x00,0x00,0x00,0x00,0x60,0x00,0x00,0x00,0x00,0x60,0x00,0x00,0x00,0x00,0x00,0x18,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x00,0x7E,0x00,0x30,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x78,0x00,0x00,0x78,0x00,0x00,0x00,0x00,0x00,0xF0,0x1E,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0x60,0x00,0x00,0x00,0x00,0x00,0x00,0x60,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x49,0xAA,0xB6,0x18,0x18,0x00,0x00,0x00,0x00,0x66,0x66,0x66,0x00,0x00,0x00,0x18,0x00,0x00,0x18,0x18,0x00,0x18,0x00,0x00,0x00,0x66,0x00,0x66,0x66,0x00,0x66,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x18,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x00,0x00,0x00,0x00,0x00,0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x70,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}
};

static inline unsigned char swap (unsigned char x)
{
    asm volatile ("swap %0" : "=r" (x) : "0" (x));
    return x;
}
    
int main(void)
{
    
    unsigned char text[20][40];
    unsigned char zeichen=0;
    unsigned char temp;
    
    for (unsigned char y=0;y<20;y++)
    {
        for (unsigned char x=0;x<40;x++)
            text[y][x]=zeichen++;            
    }
    
    
    DDRC=0x0F;
    DDRB=0x07;
    
    PORTB=(1<<FRAME)|(1<<LOAD);
    
    while(1)
    {
           PORTB=(1<<FRAME)|(1<<CP);
           
        for(unsigned char i =0; i<20;i++)
        {
            for(unsigned char j =0; j<12;j++)
            {
                for( unsigned char k =0; k<40;k++)
                {
                    temp=pgm_read_byte(&schrift[j][ text[i][k] ]);
                    
                    PORTB=(1<<CP);                
                    PORTC=swap(temp);        //ersten 4 Pixel                                    
                    PORTB=0;                    
                    PORTB=(1<<CP);        //zweiten 4 Pixel                
                    PORTC=temp;                    
                    PORTB=0;                    
                                    
                }                            
            PORTB=(1<<LOAD);    
            }
            
        }
        PORTB=(1<<LOAD)|(1<<FRAME);
        
    }
    
    
}

[MagicWSmoke]

Krass, wie hast du die 71,7 Hz berechnet?
Ich hab deinen Vorschlag durchgearbeitet, komm jetzt auf 71,6 Hz.

Ja, ist mir beim erneuten compilieren und simulieren dann auch aufgefallen dass es nur 71,6 sind, hab's dann nicht mehr so wichtig gefunden es zu ändern.
Geändert hab' ich trotzdem, schau nochmal mein voriges Post an, da bin ich schon ein wenig weiter

[MisterMou]

Ich kann noch einen nachlegen, 89,4 Hz bei -O2 Optimierung

Jedes Byte im Schrift-Array wurde woher schon geswapt, so können die ersten 4Pixel so eingelesen werden, und dann wird geswapt. So wird eine Variable gespart

   
 /*
     *B0-CP
     *B1-LOAD
     *B2-FRAME
     *
     *C0-D0
     *C1-D1
     *C2-D2
     *C3-D3
     *
     *Mega8 @ 16MHz
     */ 

    #define CP 0
    #define LOAD 1
    #define FRAME 2

    #include <avr/io.h>
    #include <avr/interrupt.h>
    #include <avr/pgmspace.h>

    //8x12 Schrift
    //http://www.mikrocontroller.net/topic/54860
    //Danke Benedikt!

    const unsigned char schrift[12][256] PROGMEM ={
    {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x03,0x00,0x0C,0x83,0x00,0x03,0x00,0x0C,0x00,0x01,0x06,0x00,0x87,0xC0,0x00,0x00,0x03,0x00,0x0C,0x03,0x0C,0x00,0x00,0xCC,0x00,0xC3,0x00,0x00,0xE0,0xC0,0xC0,0xC0,0xC0,0x00,0x67,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x42,0x55,0xD6,0x81,0x81,0xC0,0x87,0x06,0x00,0x66,0x66,0x00,0x66,0x00,0xCC,0x00,0x81,0x81,0x00,0x81,0x00,0x81,0x00,0x67,0x66,0x00,0x66,0x00,0x66,0x00,0x66,0x00,0xCC,0x00,0x87,0x00,0x06,0x00,0x81,0x87,0x00,0x81,0x00,0xFF,0x00,0x00,0x06,0xFF,0x81,0x00,0x87,0x06,0x00,0x67,0x00,0x00,0x00,0x81,0x87,0x06,0x60,0x81,0x00,0xC0,0x00,0x00,0x00,0x0E,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},
 {0x00,0xE7,0xE7,0x00,0x01,0x81,0x81,0x00,0x00,0x00,0x00,0xE3,0xC3,0x00,0xF7,0x00,0x08,0x20,0x81,0x66,0xF7,0xE7,0x00,0x81,0x81,0x81,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x66,0xC6,0x03,0x00,0x07,0x03,0xC0,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0xC7,0x01,0x87,0x87,0xC0,0xCF,0x83,0xEF,0x87,0x87,0x00,0x00,0xC0,0x00,0x06,0x87,0xC7,0x03,0xCF,0xC3,0x8F,0xEF,0xEF,0xC3,0xCC,0x87,0xE1,0x6E,0x0F,0x6C,0x6C,0x83,0xCF,0x83,0xCF,0x87,0xCF,0xCC,0xCC,0x6C,0xCC,0xCC,0xEF,0xC3,0x00,0xC3,0x83,0x00,0x03,0x00,0x0E,0x00,0xC1,0x00,0x83,0x00,0x0E,0x81,0xC0,0x0E,0x87,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC1,0x81,0x0E,0x37,0x00,0x87,0xCC,0x81,0x87,0xCC,0x06,0xC6,0x00,0x87,0xCC,0x06,0xC6,0x83,0x03,0xCC,0xCC,0x81,0x00,0xE3,0x87,0xCC,0x06,0x87,0x06,0x66,0xCC,0x00,0x00,0x66,0xA3,0x00,0xB1,0x81,0x81,0x81,0x81,0x67,0xCD,0x87,0x87,0x03,0x83,0x00,0x26,0x36,0x03,0x00,0x00,0x29,0xAA,0xBD,0x81,0x81,0x81,0xCC,0x03,0x83,0x66,0x66,0x00,0x66,0x03,0xCC,0x00,0x81,0x81,0x00,0x81,0x00,0x81,0x67,0xCD,0x66,0x00,0x66,0x00,0x66,0x00,0x66,0x00,0x03,0x8F,0xCC,0xCC,0x03,0x0F,0x03,0xCC,0xCC,0x81,0x00,0xFF,0x00,0x81,0x03,0xFF,0x03,0x87,0xCC,0x03,0x67,0xCD,0x00,0x00,0x0F,0x03,0xCC,0x03,0xC0,0x03,0xCF,0x81,0x00,0x00,0x00,0x33,0xF7,0xE7,0x00,0x00,0xC3,0xCC,0x00,0x03,0x87,0x87,0x00,0x00},
 {0x00,0x3C,0xFF,0x44,0x83,0xC3,0xC3,0x00,0x00,0x00,0x00,0xE0,0x66,0x00,0x36,0x81,0x0C,0x60,0xC3,0x66,0xBD,0x36,0x00,0xC3,0xC3,0x81,0x00,0x00,0x00,0x00,0x01,0xEF,0x00,0x87,0x66,0xC6,0xC7,0x00,0x8D,0x03,0x81,0x03,0x00,0x00,0x00,0x00,0x00,0x20,0x6C,0x03,0xCC,0xCC,0xC1,0x0C,0x06,0x6C,0xCC,0xCC,0x00,0x00,0x81,0x00,0x03,0xCC,0x6C,0x87,0x66,0x66,0xC6,0x26,0x66,0x66,0xCC,0x03,0xC0,0x66,0x06,0xEE,0x6C,0xC6,0x66,0xC6,0x66,0xCC,0x4B,0xCC,0xCC,0x6C,0xCC,0xCC,0xEC,0x03,0x08,0xC0,0xC6,0x00,0x81,0x00,0x06,0x00,0xC0,0x00,0xC6,0x00,0x06,0x81,0xC0,0x06,0x81,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x02,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x81,0x03,0xAD,0x00,0xCC,0xCC,0x03,0xCC,0xCC,0x03,0xC6,0x00,0xCC,0xCC,0x03,0xC6,0xC6,0x81,0x00,0xCC,0x00,0x00,0x87,0xCC,0xCC,0x03,0xCC,0x03,0x66,0x00,0xCC,0x00,0x06,0xC6,0x00,0x81,0x03,0x03,0x03,0x03,0xCD,0x00,0xCC,0xCC,0x03,0x44,0x00,0x6E,0x6E,0x03,0x00,0x00,0x94,0x55,0x6B,0x81,0x81,0x00,0x00,0x00,0x44,0x66,0x66,0x00,0x66,0x03,0xCC,0x00,0x81,0x81,0x00,0x81,0x00,0x81,0xCD,0x00,0x66,0x00,0x66,0x00,0x66,0x00,0x66,0x00,0x8D,0xC6,0x00,0x00,0x00,0x03,0x00,0x00,0x00,0x81,0x00,0xFF,0x00,0x81,0x00,0xFF,0x00,0xCC,0x00,0x00,0xCD,0x00,0x00,0x0E,0x06,0x00,0x00,0x00,0x81,0x00,0x00,0x03,0x00,0x03,0x00,0x66,0xBD,0x36,0x03,0x00,0x66,0x00,0x00,0x07,0xC0,0xC0,0x00,0x00},
 {0x00,0x18,0xFF,0xEE,0xC7,0xC3,0xE7,0x00,0x00,0x00,0x00,0xA3,0x66,0x00,0xF7,0xBD,0x0E,0xE0,0xE7,0x66,0xBD,0x03,0x00,0xE7,0xE7,0x81,0x81,0x03,0x00,0x42,0x01,0xEF,0x00,0x87,0x66,0xEF,0x0C,0x4C,0x8D,0x03,0x03,0x81,0x66,0x81,0x00,0x00,0x00,0x60,0xEC,0x0F,0xCC,0xC0,0xC3,0x0C,0x0C,0x6C,0xCC,0xCC,0x83,0x83,0x03,0x00,0x81,0xC0,0x6C,0xCC,0x66,0x6C,0x66,0x06,0x26,0x6C,0xCC,0x03,0xC0,0xC6,0x06,0xEF,0x6E,0x6C,0x66,0x6C,0x66,0xCC,0x03,0xCC,0xCC,0x6C,0xCC,0xCC,0x89,0x03,0x0C,0xC0,0x6C,0x00,0x00,0x00,0x06,0x00,0xC0,0x00,0x06,0x00,0x06,0x00,0x00,0x06,0x81,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x81,0x03,0xEC,0x01,0xCC,0x00,0x00,0x00,0x00,0x00,0x83,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x87,0xCF,0x00,0x8D,0x00,0x00,0x00,0x00,0x00,0x00,0x87,0xCC,0x00,0x06,0xEC,0x00,0x81,0x00,0x00,0x00,0x00,0x00,0x6C,0xCC,0xCC,0x00,0xAB,0x00,0xC6,0xC6,0x00,0x00,0x00,0x42,0xAA,0xD6,0x81,0x81,0x03,0x03,0x03,0xAB,0x66,0x66,0x00,0x66,0x87,0xCC,0x00,0x81,0x81,0x00,0x81,0x00,0x81,0x00,0x03,0x66,0x00,0x66,0x00,0x66,0x00,0x66,0x00,0xC0,0x66,0xCF,0xCF,0xCF,0x03,0x87,0x87,0x87,0x81,0x00,0xFF,0x00,0x81,0x87,0xFF,0x87,0xCC,0x87,0x87,0x00,0x87,0x00,0x06,0xC7,0xCC,0xCC,0xCC,0x00,0xCC,0x00,0x00,0x00,0x03,0x00,0xC3,0xBD,0x03,0x03,0x00,0x66,0x00,0x00,0x03,0x83,0x81,0xCF,0x00},
 {0x00,0x5A,0xBD,0xEF,0xEF,0xFF,0xFF,0x00,0x00,0x00,0x00,0x27,0x66,0x00,0x36,0xE7,0x8F,0xE3,0x81,0x66,0xBD,0xC3,0x00,0x81,0x81,0x81,0xC0,0x06,0x0C,0x66,0x83,0xC7,0x00,0x87,0x42,0xC6,0x0C,0xCC,0x07,0x06,0x06,0xC0,0xC3,0x81,0x00,0x00,0x00,0xC0,0xED,0x03,0xC0,0xC0,0xC6,0x0C,0x0C,0x60,0xCC,0xCC,0x83,0x83,0x06,0xE7,0xC0,0x81,0xED,0xCC,0x66,0x0C,0x66,0x46,0x46,0x0C,0xCC,0x03,0xC0,0xC6,0x06,0xEF,0x6F,0x6C,0x66,0x6C,0x66,0x0C,0x03,0xCC,0xCC,0x6C,0x87,0xCC,0x81,0x03,0x06,0xC0,0x00,0x00,0x00,0x87,0xC7,0x87,0xC7,0x87,0x06,0x67,0xC6,0x87,0xC3,0x66,0x81,0xCF,0x8F,0x87,0xCD,0x67,0xCE,0x87,0xCF,0xCC,0xCC,0x6C,0x6C,0x66,0xCF,0x06,0x81,0x81,0x00,0x83,0x0C,0xCC,0x87,0x87,0x87,0x87,0x8F,0x87,0x87,0x87,0x87,0x87,0x87,0x87,0x87,0x87,0x4C,0xEF,0x8D,0x87,0x87,0x87,0xCC,0xCC,0x66,0xCC,0xCC,0x87,0x06,0x6D,0x00,0xE7,0x87,0x87,0x87,0xCC,0x8F,0x6E,0xE7,0x87,0x03,0xAA,0x00,0x87,0x87,0x03,0x33,0xCC,0x29,0x55,0xBD,0x81,0x81,0x87,0x87,0x87,0x2A,0x6E,0x66,0xEF,0x6E,0xCC,0x87,0x00,0x81,0x81,0x00,0x81,0x00,0x81,0x87,0x87,0x76,0xF7,0x7E,0xFF,0x76,0xFF,0x7E,0x00,0x60,0x66,0x4C,0x4C,0x4C,0x03,0x03,0x03,0x03,0x81,0x00,0xFF,0x00,0x81,0x03,0xFF,0xCC,0x8D,0xCC,0xCC,0x87,0xCC,0x66,0xC7,0x66,0xCC,0xCC,0xCC,0x66,0xCC,0x00,0x00,0x00,0xCF,0x00,0x8F,0xBD,0xC3,0x00,0x00,0x66,0x00,0x00,0x03,0xC0,0x03,0xCF,0x00},
 {0x00,0x18,0xFF,0xEF,0xEF,0x7E,0xFF,0x00,0x00,0x00,0x00,0x8F,0xC3,0x00,0x36,0x7E,0xEF,0xEF,0x81,0x66,0xB7,0x66,0x00,0x81,0x81,0x81,0xEF,0xEF,0x0C,0xFF,0x83,0xC7,0x00,0x03,0x00,0xC6,0x87,0x81,0xAF,0x00,0x06,0xC0,0xFF,0xE7,0x00,0xEF,0x00,0x81,0x6D,0x03,0x81,0x83,0xCC,0x8F,0x8F,0xC0,0x87,0xC7,0x00,0x00,0x0C,0x00,0x60,0x03,0xED,0xCC,0xC7,0x0C,0x66,0xC7,0xC7,0x0C,0xCF,0x03,0xC0,0x87,0x06,0x6D,0xEF,0x6C,0xC7,0x6C,0xC7,0x07,0x03,0xCC,0xCC,0x6D,0x03,0x87,0x03,0x03,0x03,0xC0,0x00,0x00,0x00,0xC0,0x66,0xCC,0xCC,0xCC,0x8F,0xCC,0x67,0x81,0xC0,0xC6,0x81,0x6D,0xCC,0xCC,0x66,0xCC,0xE6,0xCC,0x06,0xCC,0xCC,0x6C,0xC6,0x66,0xC8,0x0C,0x00,0xC0,0x00,0xC6,0x0C,0xCC,0xCC,0xC0,0xC0,0xC0,0xC0,0xCC,0xCC,0xCC,0xCC,0x81,0x81,0x81,0xCC,0xCC,0x0C,0xB1,0xEF,0xCC,0xCC,0xCC,0xCC,0xCC,0x66,0xCC,0xCC,0xCC,0xCF,0x6D,0x6C,0x81,0xC0,0x81,0xCC,0xCC,0xCC,0x6F,0x00,0x00,0x06,0xAB,0xCF,0x03,0x73,0x03,0x66,0x66,0x94,0xAA,0x6B,0x81,0x8F,0xCC,0xCC,0xCC,0x2A,0x60,0x66,0x60,0x60,0x0C,0xCF,0x8F,0xF1,0xFF,0xFF,0xF1,0xFF,0xFF,0xC0,0xCC,0x06,0x06,0x00,0x00,0x06,0x00,0x00,0x6C,0xE7,0x6F,0x0C,0x0C,0x0C,0xCF,0x03,0x03,0x03,0x8F,0xF1,0xFF,0x00,0x00,0x03,0xFF,0xCC,0xCC,0xCC,0xCC,0xCC,0xCC,0x66,0x66,0x66,0xCC,0xCC,0xCC,0x66,0xCC,0x00,0x00,0xCF,0x03,0x8F,0x73,0xB7,0x66,0xCF,0x00,0xC3,0x00,0x81,0x87,0x87,0xC7,0xCF,0x00},
 {0x00,0xDB,0x3C,0xEF,0xC7,0x7E,0xE7,0x00,0x00,0x00,0x00,0xCC,0x81,0x00,0x36,0x7E,0x8F,0xE3,0x81,0x00,0xB1,0x66,0x00,0x81,0x81,0x81,0xC0,0x06,0x0C,0x66,0xC7,0x83,0x00,0x03,0x00,0xC6,0xC0,0x03,0xED,0x00,0x06,0xC0,0xC3,0x81,0x00,0x00,0x00,0x03,0x6F,0x03,0x03,0xC0,0xEF,0xC0,0xCC,0x81,0xCC,0x81,0x00,0x00,0x06,0xE7,0xC0,0x03,0xED,0xCF,0x66,0x0C,0x66,0x46,0x46,0xEC,0xCC,0x03,0xCC,0xC6,0x26,0x6C,0xED,0x6C,0x06,0xEC,0xC6,0x81,0x03,0xCC,0xCC,0x6D,0x87,0x03,0x06,0x03,0x81,0xC0,0x00,0x00,0x00,0xC7,0x66,0x0C,0xCC,0xCF,0x06,0xCC,0x66,0x81,0xC0,0x87,0x81,0x6D,0xCC,0xCC,0x66,0xCC,0x67,0x06,0x06,0xCC,0xCC,0x6D,0x83,0x66,0x81,0x06,0x81,0x81,0x00,0x6C,0x0C,0xCC,0xCF,0xC7,0xC7,0xC7,0xC7,0x0C,0xCF,0xCF,0xCF,0x81,0x81,0x81,0xCC,0xCC,0x8F,0xF7,0x8D,0xCC,0xCC,0xCC,0xCC,0xCC,0x66,0xCC,0xCC,0xCD,0x06,0x6D,0xC6,0x81,0xC7,0x81,0xCC,0xCC,0xCC,0xED,0xEF,0xEF,0x0C,0x2B,0xC0,0xE6,0xF6,0x87,0xCC,0x33,0x42,0x55,0xD6,0x81,0x81,0xCC,0xCC,0xCC,0x2A,0x60,0x66,0x60,0x60,0x0C,0x03,0x81,0x00,0x00,0x81,0x81,0x00,0x81,0xC7,0xCC,0x06,0x06,0x00,0x00,0x06,0x00,0x00,0xC7,0x6C,0x66,0x8F,0x8F,0x8F,0x00,0x03,0x03,0x03,0x00,0x81,0xFF,0xFF,0x81,0x03,0x00,0xCC,0xCC,0xCC,0xCC,0xCC,0xCC,0x66,0x66,0x66,0xCC,0xCC,0xCC,0x66,0x87,0x00,0x00,0x00,0x03,0x00,0xF6,0xB1,0x66,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xCF,0x00},
 {0x00,0x99,0x7E,0xC7,0x83,0x81,0x81,0x00,0x00,0x00,0x00,0xCC,0xE7,0x00,0x76,0xE7,0x0E,0xE0,0xE7,0x00,0xB1,0xC3,0xEF,0xE7,0x81,0xE7,0x81,0x03,0xEF,0x42,0xC7,0x83,0x00,0x00,0x00,0xEF,0xC0,0x06,0xCC,0x00,0x03,0x81,0x66,0x81,0x00,0x00,0x00,0x06,0x6E,0x03,0x06,0xC0,0xC0,0xC0,0xCC,0x03,0xCC,0x81,0x83,0x83,0x03,0x00,0x81,0x00,0x0C,0xCC,0x66,0x6C,0x66,0x06,0x06,0x6C,0xCC,0x03,0xCC,0xC6,0x66,0x6C,0xEC,0x6C,0x06,0xED,0x66,0xCC,0x03,0xCC,0xCC,0xC6,0xCC,0x03,0x26,0x03,0xC0,0xC0,0x00,0x00,0x00,0xCC,0x66,0x0C,0xCC,0x0C,0x06,0xCC,0x66,0x81,0xC0,0xC6,0x81,0x6D,0xCC,0xCC,0x66,0xCC,0x06,0x81,0x06,0xCC,0xCC,0x6D,0x83,0x66,0x06,0x03,0x81,0x03,0x00,0x6C,0xCC,0xCC,0x0C,0xCC,0xCC,0xCC,0xCC,0x0C,0x0C,0x0C,0x0C,0x81,0x81,0x81,0xCF,0xCF,0x0C,0x8D,0x8D,0xCC,0xCC,0xCC,0xCC,0xCC,0x66,0xCC,0xCC,0xCE,0x06,0x6E,0x83,0x81,0xCC,0x81,0xCC,0xCC,0xCC,0xEC,0x00,0x00,0x0C,0xAA,0xC0,0x3C,0xBD,0x87,0xCC,0x33,0x29,0xAA,0xBD,0x81,0x81,0xCF,0xCF,0xCF,0xAB,0x6E,0x66,0x6E,0xEF,0xCC,0xCF,0x81,0x00,0x00,0x81,0x81,0x00,0x81,0xCC,0xCF,0xF7,0x76,0xFF,0x7E,0x76,0xFF,0x7E,0xC6,0x6C,0x66,0x0C,0x0C,0x0C,0x00,0x03,0x03,0x03,0x00,0x81,0xFF,0xFF,0x81,0x03,0x00,0xCC,0xCC,0xCC,0xCC,0xCC,0xCC,0x66,0xC7,0xC7,0xCC,0xCC,0xCC,0x66,0x03,0x00,0x00,0x00,0x00,0x00,0xBD,0xB1,0xC3,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xCF,0x00},
 {0x00,0x3C,0xFF,0x83,0x01,0x81,0x81,0x00,0x00,0x00,0x00,0xCC,0x81,0x00,0x7E,0xBD,0x0C,0x60,0xC3,0x66,0xB1,0xC0,0xEF,0xC3,0x81,0xC3,0x00,0x00,0x00,0x00,0xEF,0x01,0x00,0x03,0x00,0xC6,0x8F,0xCC,0xCD,0x00,0x81,0x03,0x00,0x00,0x83,0x00,0x83,0x0C,0x6C,0x03,0xCC,0xCC,0xC0,0xCC,0xCC,0x03,0xCC,0x03,0x83,0x83,0x81,0x00,0x03,0x03,0x0C,0xCC,0x66,0x66,0xC6,0x26,0x06,0x66,0xCC,0x03,0xCC,0x66,0x66,0x6C,0x6C,0xC6,0x06,0xC7,0x66,0xCC,0x03,0xCC,0x87,0xC6,0xCC,0x03,0x6C,0x03,0x60,0xC0,0x00,0x00,0x00,0xCC,0x66,0xCC,0xCC,0xCC,0x06,0xC7,0x66,0x81,0xC0,0x66,0x81,0x6D,0xCC,0xCC,0x66,0xCC,0x06,0xCC,0xC6,0xCC,0x87,0xC6,0xC6,0xC3,0x4C,0x03,0x81,0x03,0x00,0xEF,0xCC,0xCC,0xCC,0xCC,0xCC,0xCC,0xCC,0xCC,0x0C,0x0C,0x0C,0x81,0x81,0x81,0xCC,0xCC,0x4C,0x8D,0x8D,0xCC,0xCC,0xCC,0xCC,0xCC,0xC3,0xCC,0xCC,0xCC,0x0C,0xC6,0xC6,0x8D,0xCC,0x81,0xCC,0xCC,0xCC,0x6C,0x00,0x00,0xCC,0x44,0xC0,0x68,0x3B,0x87,0x66,0x66,0x94,0x55,0x6B,0x81,0x81,0xCC,0xCC,0xCC,0x44,0x66,0x66,0x66,0x00,0x87,0x03,0x81,0x00,0x00,0x81,0x81,0x00,0x81,0xCC,0xCC,0x00,0x66,0x00,0x66,0x66,0x00,0x66,0xC7,0x6C,0xC6,0x4C,0x4C,0x4C,0x00,0x03,0x03,0x03,0x00,0x81,0xFF,0xFF,0x81,0x03,0x00,0xCC,0x8F,0xCC,0xCC,0xCC,0xCC,0x66,0x06,0x06,0xCC,0xCC,0xCC,0xC3,0x03,0x00,0x00,0x00,0xCF,0x8F,0x3B,0xB1,0xC0,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xCF,0x00},
 {0x00,0xE7,0xE7,0x01,0x00,0xE7,0xE7,0x00,0x00,0x00,0x00,0x87,0x81,0x00,0x6E,0x81,0x08,0x20,0x81,0x66,0xB1,0x6C,0xEF,0x81,0x81,0x81,0x00,0x00,0x00,0x00,0xEF,0x01,0x00,0x03,0x00,0xC6,0x03,0xC8,0x67,0x00,0xC0,0x06,0x00,0x00,0x83,0x00,0x83,0x08,0xC7,0xCF,0xCF,0x87,0xE1,0x87,0x87,0x03,0x87,0x07,0x00,0x81,0xC0,0x00,0x06,0x03,0xC7,0xCC,0xCF,0xC3,0x8F,0xEF,0x0F,0xE3,0xCC,0x87,0x87,0x6E,0xEF,0x6C,0x6C,0x83,0x0F,0xC0,0x6E,0x87,0x87,0x87,0x03,0xC6,0xCC,0x87,0xEF,0xC3,0x20,0xC3,0x00,0x00,0x00,0x67,0xCD,0x87,0x67,0x87,0x0F,0xC0,0x6E,0xE7,0xCC,0x6E,0xE7,0x6C,0xCC,0x87,0xC7,0xC7,0x0F,0x87,0x83,0x67,0x03,0xC6,0x6C,0xC0,0xCF,0xC1,0x81,0x0E,0x00,0x00,0x87,0x67,0x87,0x67,0x67,0x67,0x67,0x87,0xC7,0xC7,0xC7,0xE7,0xE7,0xE7,0xCC,0xCC,0xCF,0xFE,0xED,0x87,0x87,0x87,0x67,0x67,0xC0,0x87,0x87,0x87,0xEF,0x8B,0x6C,0x07,0x67,0xE7,0x87,0x67,0xCC,0x6C,0x00,0x00,0x87,0x83,0x00,0xC0,0xF3,0x03,0x33,0xCC,0x42,0xAA,0xD6,0x81,0x81,0xCC,0xCC,0xCC,0x83,0x66,0x66,0x66,0x00,0x03,0x03,0x81,0x00,0x00,0x81,0x81,0x00,0x81,0x67,0xCC,0x00,0x66,0x00,0x66,0x66,0x00,0x66,0x6C,0xC7,0x8F,0xCF,0xCF,0xCF,0x00,0x87,0x87,0x87,0x00,0x81,0xFF,0xFF,0x81,0x87,0x00,0x87,0x0C,0x87,0x87,0x87,0x87,0xB7,0x0F,0x0F,0x87,0x87,0x87,0xC0,0x87,0x00,0x00,0x00,0x00,0x00,0xF3,0xB1,0x6C,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},
 {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x0C,0x00,0x00,0x00,0x00,0x00,0x00,0xE7,0x00,0xE7,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xE1,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xCC,0x00,0x00,0xCC,0x00,0x00,0x00,0x00,0x00,0x06,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x81,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x81,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xF1,0x30,0x00,0x00,0x00,0x29,0x55,0xBD,0x81,0x81,0x00,0x00,0x00,0x00,0x66,0x66,0x66,0x00,0x03,0x00,0x81,0x00,0x00,0x81,0x81,0x00,0x81,0x00,0x00,0x00,0x66,0x00,0x66,0x66,0x00,0x66,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x81,0xFF,0xFF,0x00,0x00,0x00,0x00,0x06,0x00,0x00,0x00,0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x81,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x00,0xE7,0x00,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},
 {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x87,0x00,0x00,0x87,0x00,0x00,0x00,0x00,0x00,0x0F,0xE1,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x0F,0x00,0x00,0x00,0x00,0x00,0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x0F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x94,0xAA,0x6B,0x81,0x81,0x00,0x00,0x00,0x00,0x66,0x66,0x66,0x00,0x00,0x00,0x81,0x00,0x00,0x81,0x81,0x00,0x81,0x00,0x00,0x00,0x66,0x00,0x66,0x66,0x00,0x66,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x81,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x0C,0x00,0x00,0x00,0x00,0x00,0x0F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x07,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}
    };

    
    int main(void)
    {
    
        unsigned char text[20][40];
        unsigned char zeichen=0;
        unsigned char temp;
    
        for (unsigned char y=0;y<20;y++)
        {
            for (unsigned char x=0;x<40;x++)
                text[y][x]=zeichen++;            
        }
    
    
        DDRC=0x0F;
        DDRB=0x07;
    
    
        PORTB=(1<<FRAME)|(1<<LOAD);
        
        unsigned char *cptr;
    
        while(1)
        {
               PORTB=(1<<FRAME)|(1<<CP);
           
            for(unsigned char i =0; i<20;i++)
            {
                for(unsigned char j =0; j<12;j++)
                {
                    cptr = &schrift[j][0];
                    for( unsigned char k =0; k<40;k++)
                    {
                        temp=pgm_read_byte(cptr + text[i][k]);
                    
                        PORTB=(1<<CP);                
                        PORTC=temp;        //ersten 4 Pixel                                    
                        PORTB=0;                    
                        PORTB=(1<<CP);           
                        asm volatile ("swap %0" : "=r" (temp) : "0" (temp));            
                        PORTC=temp;            //zweiten 4 Pixel         
                        PORTB=0;                    
                                    
                    }                            
                PORTB=(1<<LOAD);    
                }
            
            }
            PORTB=(1<<LOAD)|(1<<FRAME);
        
        }
    
    
    }

Nebenbei, ich probiere die Schaltung immer aus und messe mit dem Oszi nach, so kann man sichergehen, dass das Display nachkommt, denn an die Spezikikationen im Datenblatt halten wir uns nichtmehr

Ich habs gerade mal mit nem größeren Quarz getestet, gute 18MHz das macht dann über 102Hz
Aber das Ziel sind 16Mhz

[MagicWSmoke]

Ich kann noch einen nachlegen, 89,4 Hz bei -O2 Optimierung

Da kommt bei mir nur 84,8Hz raus, mit -Os sind's 86,6Hz, da werden dann evtl. die Compilerversion und Makefileoptionen Einfluss haben.

Die innerste und damit wichtigste Loop sieht jetzt so aus, da wüsste ich nicht mehr viel zu optimieren:

L0673:
    ld      r24,X+
    movw    r30,r18
    add     r30,r24
    adc     r31,r1
    lpm     r30,Z
    out     p18,r25
    out     p15,r30
    out     p18,r1
    out     p18,r25
    swap    r30
    out     p15,r30
    out     p18,r1
    cp      r26,r16
    cpc     r27,r17
    brne    L0673

[MisterMou]

Hmm, von asm hab ich nicht so viel Ahnung, sonst hätte ich gleich alles so geschrieben

Ich habe die neuste AVR-Studio 5 Version instaliert

[MisterMou]

Die innerste und damit wichtigste Loop sieht jetzt so aus, da wüsste ich nicht mehr viel zu optimieren:

L0673:
    ld      r24,X+
    movw    r30,r18
    add     r30,r24
    adc     r31,r1
    lpm     r30,Z
    out     p18,r25
    out     p15,r30
    out     p18,r1
    out     p18,r25
    swap    r30
    out     p15,r30
    out     p18,r1
    cp      r26,r16
    cpc     r27,r17
    brne    L0673

Was macht diese Zeile?

 adc     r31,r1

r1 müsste doch 0 sein...
Was der Befehl macht weiß ich(denke ich), aber warum?
r31 verändert sich doch nicht, welche Rolle spielt das Carry?