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

**MagicWSmoke** · 21.04.2012, 18:30

Zitat von MisterMou

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** · 21.04.2012, 19:09

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

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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    };

    
    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** · 21.04.2012, 19:41

Zitat von MisterMou

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:

Code:

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** · 21.04.2012, 19:52

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

**MagicWSmoke** · 21.04.2012, 20:00

Zitat von MisterMou

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

So 'ne Routine in ASM ist eigentlich kein Problem, nur beim C Inline Assembler hab' ich so meine Bauchschmerzen.
Aber es lesen zu können reicht hier ja auch schon. Die Rechnerei die der Compiler beim Progmem Zugriff veranstaltet hatte, sagte mir dass es besser ist dort einen Pointer zu verwenden.

Ich habe die neuste AVR-Studio 5 Version instaliert

Und ich die 4er Version.

**MisterMou** · 22.04.2012, 10:39

Zitat von MagicWSmoke

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

Code:

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?

Code:

 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?

**sternst** · 22.04.2012, 11:04

Zitat von MisterMou

Was macht diese Zeile?

Sie addiert den Übertrag zu R31, der möglicherweise bei der Zeile vorher entstanden ist.

Code:

    add     r30,r24
    adc     r31,r1

R24 wird zum 16-Bit Wert in R30:31 addiert.

**MagicWSmoke** · 22.04.2012, 11:07

Zitat von MisterMou

Was macht diese Zeile?

Code:

 adc     r31,r1

Sie sorgt dafür, wie Du richtig erkannt hast, dass eine 0 addiert und das Carry übernommen wird.

r31 verändert sich doch nicht, welche Rolle spielt das Carry?

Doch, R31 muss sich ändern, da der Fontblock nicht aligned ist, siehst Du wenn Du Dir den Pointer ausgeben lässt, bei mir startete der bei 0x26.

Wenn Du dem Compiler klarmachen kannst, dass er für den Font auf ein Alignement auf einen 256 Byte Block macht, dann sparst Du Dir den ADC, 1 Takt, mehr aber nicht, da das MOVW gleichviel wie ein MOV braucht.
Und sollte Dir der Code nicht zu hässlich werden und wenn Du genügend Flash über hast, dann kannst Du diese innere Schleife entrollen und einfach 40 mal wiederholen, das spart Dir dann mehr, nämlich 2 Takte pro Durchlauf.

**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; \
       }