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

**MisterMou** · 22.04.2012, 13:31

Ahh, genau, der Flash hat ja 16Bit Adressen und das Array liegt bestimmt nicht nur in einem 256Byte Block, damit ist alles klar

Ich sag ja, asm ist nicht meine Welt.

Das mit dem Entrollen hatte ich gestern schon mal probiert, dabei wurde "k" durch Konstanten ersetzt. Das Ergebnis war langsamer o.O

Bild hier

http://www.myvideo.de/watch/8517232/...GLCD_Textmodus

**MagicWSmoke** · 23.04.2012, 00:08

So mag ich das, wenn da passende Grüße kommen

Zitat von MisterMou

Das mit dem Entrollen hatte ich gestern schon mal probiert, dabei wurde "k" durch Konstanten ersetzt. Das Ergebnis war langsamer o.O

Langsamer muss es nicht zwingend sein, mit Konstanten wird's aber nix. Nachdem der Compiler in mancher Beziehung extrem stur ist, hab' ich's nochmal anders versucht.
Wenn's geht, was ich doch hoffe, zumindest die Simulation sah gut aus, so wären das 107Hz@16MHz. Optimierung -Os.

Code:

 /*
     *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 ={
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    };

    #define char_put() \
      {asm volatile("ld __tmp_reg__, x+"      "\n\t" \
                    "movw  r30, %A0"          "\n\t" \
                    "add   r30, __tmp_reg__"  "\n\t" \
                    "adc   r31, __zero_reg__" "\n\t" \
                    "lpm   %A1, z"            "\n\t" \
                    : \
                    : "r" (&schrift[j][0]), "r" (temp) \
                    : "r26", "r27", "r30", "r31" \
                   ); \
            PORTB=(1<<CP); \
            PORTC=temp; \
            PORTB=0; \
            PORTB=(1<<CP); \
            asm volatile ("swap %0" : "=r" (temp) : "0" (temp)); \
            PORTC=temp; \
            PORTB=0; \
       }


    int main(void)
    {
        unsigned char text[20][40];
        unsigned char zeichen = 0;
        volatile unsigned char dummy;
        unsigned char temp = 0;
        unsigned char *tptr;
    
        for (unsigned char y = 0; y < 20; y++)
        {
            for (unsigned char x = 0; x < 40; x++)
                   text[y][x] = zeichen++;
        }
            dummy = text[19][39];  // optimierung verhindern
    
        DDRC=0x0F;
        DDRB=0x07;
    
    
        PORTB=(1<<FRAME)|(1<<LOAD);       
    
        while(1)
        {
        tptr = &text[0][0];
            PORTB=(1<<FRAME)|(1<<CP);            
            for(volatile unsigned char lines =0; lines<20;lines++)
            {
                for(volatile unsigned char rows =0; rows<12;rows++)
                {
                unsigned char j = rows;
                    asm volatile("movw r26, %A0" : : "r" (tptr) : "r26", "r27");
                    char_put() char_put() char_put() char_put();
                    char_put() char_put() char_put() char_put();
                    char_put() char_put() char_put() char_put();
                    char_put() char_put() char_put() char_put();
                    char_put() char_put() char_put() char_put();
                    char_put() char_put() char_put() char_put();
                    char_put() char_put() char_put() char_put();
                    char_put() char_put() char_put() char_put();
                    char_put() char_put() char_put() char_put();
                    char_put() char_put() char_put() char_put();            
                PORTB=(1<<LOAD);    
                }
            tptr += 40;
            }
            PORTB=(1<<LOAD)|(1<<FRAME);
        }
    }

Nachtrag:
So werden's 114Hz:

Code:

      const unsigned char schrift[12][256] PROGMEM __attribute__((aligned(256))) ={
      //  ...
    #define char_put() \
      {asm volatile("ld __tmp_reg__, x+"      "\n\t" \
                    "movw  r30, %A0"          "\n\t" \
                    "add   r30, __tmp_reg__"  "\n\t" \
                    "lpm   %A1, z"            "\n\t" \
                    : \
                    : "r" (&schrift[j][0]), "r" (temp) \
                    : "r26", "r27", "r30", "r31" \
                   ); \
            PORTB=(1<<CP); \
            PORTC=temp; \
            PORTB=0; \
            PORTB=(1<<CP); \
            asm volatile ("swap %0" : "=r" (temp) : "0" (temp)); \
            PORTC=temp; \
            PORTB=0; \
       }

**MisterMou** · 23.04.2012, 16:25

Oh man...
Jetzt ist es vorbei, bis gestern war der Code kein Problem, jetzt muss ich erst einmal rausbekommen was was macht

Woher hast Du das Wissen? Gibt es da ein Zauberbuch?

Das Display macht keine Probleme, es läuft auch noch bei 132Hz, jetzt sind es 114,6Hz mit -O2 bzw. -O3.

**MagicWSmoke** · 23.04.2012, 16:44

Zitat von MisterMou

Woher hast Du das Wissen? Gibt es da ein Zauberbuch?

286/386er in Assembler geschrieben, auch dazu gibt's natürlich Bücher, und dann irgendwann mal auf AVR. Da kennt man das Meiste schon und braucht eigentlich nur noch ein Instruction Set Datenblatt.
Mehr Kopfzerbrechen hatte mir der C-Inlineassembler gemacht, der recht kryptisch ist und auch durchaus kreativ Code generiert hatte. Manchmal unfunktionell, aber immer wieder interessant. Für den Assembler gibt's Quellen im Netz, so auch hier im Forum, und manches bringt man durch Trial & Error raus.

Das Display macht keine Probleme, es läuft auch noch bei 132Hz, jetzt sind es 114,6Hz mit -O2 bzw. -O3.

So wie ich's verstehe läuft die aktuelle Hardware mit dem neuen Code, ist das richtig ? Konnte nur "trocken" probieren, war also nicht sicher.

**MisterMou** · 23.04.2012, 16:58

Du bist also ein "alter" Hase

Ich fang ja erst an

Normalerweise wüsste ich nicht einmal was was ein AVR ist

2.Semester Elektrotechnik...

Genau, läuft alles wunderbar, hatte bloß mal zum Test 18,4MHz drauf gegeben

Ich schlage schon Alarm, wenns nicht läuft^^

**MagicWSmoke** · 23.04.2012, 19:32

Ja, ich mach' das schon 'ne geraume Zeit

Ist in Ordnung, schaut doch auch ganz gut aus.
Hilft außerdem immer mit den Stoff weiter zu sein als der Rest.

Ich denke, dass es noch schneller geht, aber dann müsste man die Schleifen komplett in Assembler machen, da ließe sich noch was sparen.
Wie's jetzt ist, find' ich 'ne gute Mischung, es ist noch weitestgehend C und da optimiert, wo der Compiler selbst nicht wollte - zum Teil kam da schon wildes Zeug raus.