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

**MagicWSmoke** · 21.04.2012, 17:13

Zitat von Besserwessi

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.

Code:

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

Code:

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

eine Anordnung

Code:

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

Ein

Code:

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:

Code:

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** · 21.04.2012, 18:25

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:

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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};

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** · 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 ={
    {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x03,0x00,0x0C,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},
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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.