jak dziala i2s ??



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From: "Janicki Dariusz" <janiol_at_nospam_zeus.polsl.gliwice.pl>
Subject: jak dziala i2s ??
Date: Fri, 13 Dec 2002 15:52:32 +0100

Witam

Czy ktos interesowal sie transmisja I2S ktora najczesciej stosuje sie w ac /
ca , wymagajacych szybkiej transmisji danych.
Ja proboje okiełznac szeregowy przetwornik ca (i2s) ale narazie nie zbyt
dobrze mi to wychodzi .Nie wiem gdzie jest problem , czy zegar musi byc
taktowany sygnalem o konkretnej czestotliwosci ( syganl 50 % wypelnienia -
muss). Moze sygnaly bck, ws, powinny miec okreslona sekwencje .Prosze o
ewentualne sugestie.
Pozdrowienia
Darek




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From: amsNO_SPAM_at_nospam_e7.pl (Andrzej Sarbinowski)
Subject: Re: jak dziala i2s ?? - i2s (0/1)
Date: Fri, 13 Dec 2002 18:49:14 GMT

On Fri, 13 Dec 2002 15:52:32 +0100, "Janicki Dariusz"
<janiol_at_nospam_zeus.polsl.gliwice.pl> wrote:

Witam

Czy ktos interesowal sie transmisja I2S ktora najczesciej stosuje sie w ac /
ca , wymagajacych szybkiej transmisji danych.

Przepraszam ze wale zrodla na liste, ale nie sa zbyt dlugie, a moze
komus jeszcze sie przydadza.
Program napisany pod archimedesa C dla 8051. Sklada sie z dwoch
modulow : procedury obslugi I2S w asemblerze (dla obslugi TDA1543 -
D/A 2x16 bit w moim przypadku). W C fragment programu do obslugi tego
czegos z poziomu C. W plikach moga byc drobne niedopatrzenia edycyjne
na 100 %.


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From: amsNO_SPAM_at_nospam_e7.pl (Andrzej Sarbinowski)
Subject: Re: jak dziala i2s ?? - i2s (0/1)
Date: Fri, 13 Dec 2002 19:17:01 GMT

Cos sie zrodlo nie dokleilo ...
; Plik i2s.asm

PUBLIC SendI2S
$DEFFN SendI2S(0,0,0,0,0,4,0,0)

EXTERN _R

I2SWR EQU P1.1
I2SCL EQU P1.2
I2SDA EQU P1.3

RSEG CODE

macro %W10us
MOV R5,#4
DJNZ R5,$
endmac

SendI2S: MOV R0,#$LOCBI SendI2S
MOV _at_nospam_R0,_R+6
INC R0
MOV _at_nospam_R0,_R+7

MOV R0,#$LOCBI SendI2S
MOV A,_at_nospam_R0
XRL A,#80h
CLR KTORYKAN
LCALL SendI2SB

MOV R0,#$LOCBI SendI2S+1
MOV A,_at_nospam_R0
CLR KTORYKAN
LCALL SendI2SB

MOV A,#0
SETB KTORYKAN
LCALL SendI2SB

MOV R0,#$LOCBI SendI2S+2
MOV A,_at_nospam_R0
XRL A,#80h
SETB KTORYKAN
LCALL SendI2SB

MOV R0,#$LOCBI SendI2S+3
MOV A,_at_nospam_R0
SETB KTORYKAN
LCALL SendI2SB

MOV A,#0
CLR KTORYKAN
LCALL SendI2SB

RET

SendI2SB: MOV R7,#7
NastBIT: RLC A
MOV I2SDA,C
%W10us
SETB I2SCL
%W10us
CLR I2SCL
DJNZ R7,NastBIT
RLC A
MOV I2SDA,C
MOV C,KTORYKAN
MOV I2SWR,C
%W10us
SETB I2SCL
%W10us
CLR I2SCL
RET

END



/* Plik przyklad.c */

typedef unsigned char byte;
typedef unsigned int word;

extern void SendI2S(word,word);

void init_I2S(void);

void main(void)
{
init_I2S();
do
{
/* ........ */

SendI2S(KanalL,KanalP);
} while(1);
}

void init_I2S(void)
{ SendI2S(0,0);
SendI2S(0,0);
}



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From: "Janicki Dariusz" <janiol_at_nospam_zeus.polsl.gliwice.pl>
Subject: Re: jak dziala i2s ?? - i2s (0/1)
Date: Fri, 13 Dec 2002 20:39:24 +0100

Serdeczne Dzieki


Użytkownik "Andrzej Sarbinowski" <amsNO_SPAM_at_nospam_e7.pl> napisał w wiadomości
news:3dfa31d7.8881850_at_nospam_news.tpi.pl...
Cos sie zrodlo nie dokleilo ...
; Plik i2s.asm

PUBLIC SendI2S
$DEFFN SendI2S(0,0,0,0,0,4,0,0)

EXTERN _R

I2SWR EQU P1.1
I2SCL EQU P1.2
I2SDA EQU P1.3

RSEG CODE

macro %W10us
MOV R5,#4
DJNZ R5,$
endmac

SendI2S: MOV R0,#$LOCBI SendI2S
MOV _at_nospam_R0,_R+6
INC R0
MOV _at_nospam_R0,_R+7

MOV R0,#$LOCBI SendI2S
MOV A,_at_nospam_R0
XRL A,#80h
CLR KTORYKAN
LCALL SendI2SB

MOV R0,#$LOCBI SendI2S+1
MOV A,_at_nospam_R0
CLR KTORYKAN
LCALL SendI2SB

MOV A,#0
SETB KTORYKAN
LCALL SendI2SB

MOV R0,#$LOCBI SendI2S+2
MOV A,_at_nospam_R0
XRL A,#80h
SETB KTORYKAN
LCALL SendI2SB

MOV R0,#$LOCBI SendI2S+3
MOV A,_at_nospam_R0
SETB KTORYKAN
LCALL SendI2SB

MOV A,#0
CLR KTORYKAN
LCALL SendI2SB

RET

SendI2SB: MOV R7,#7
NastBIT: RLC A
MOV I2SDA,C
%W10us
SETB I2SCL
%W10us
CLR I2SCL
DJNZ R7,NastBIT
RLC A
MOV I2SDA,C
MOV C,KTORYKAN
MOV I2SWR,C
%W10us
SETB I2SCL
%W10us
CLR I2SCL
RET

END



/* Plik przyklad.c */

typedef unsigned char byte;
typedef unsigned int word;

extern void SendI2S(word,word);

void init_I2S(void);

void main(void)
{
init_I2S();
do
{
/* ........ */

SendI2S(KanalL,KanalP);
} while(1);
}

void init_I2S(void)
{ SendI2S(0,0);
SendI2S(0,0);
}





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From: amsNO_SPAM_at_nospam_e7.pl (Andrzej Sarbinowski)
Subject: Re: jak dziala i2s ?? - i2s (0/1)
Date: Fri, 13 Dec 2002 20:15:41 GMT

Skomplikowalem na probe te pliki i wyszly dwa niedopatrzenia (za ostro
cialem) .

W pliku I2S.ASM zamienic to :
RET

END

na to :
RET

RSEG BITVARS
KTORYKAN DS 1

END

W pliku przyklad.c zamienic to :

void main(void)
{
init_I2S();

na to :

void main(void)
{ word KanalL,KanalP;

init_I2S();

I teraz sie poprawnie kompiluje (sprawdzilem).

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From: amsNO_SPAM_at_nospam_e7.pl (Andrzej Sarbinowski)
Subject: Re: jak dziala i2s ?? - i2s (1/1)
Date: Fri, 13 Dec 2002 18:49:15 GMT

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end