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#define nops() {_nop_();_nop_();_nop_();_nop_();_nop_();}
//nop·
7?
?l
uchar i2c_ad_main; // qV1?
uchar i2c_ad_sub; // q01?
uchar *i2c_buf; //?
/¤
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uchar i2c_num; //?
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void i2c_start(void) //
Sê
void i2c_stop(void) //
T?ê
void i2c_ack_main(bit ack_main) //??s
a
ü ack_main=1:ack??s
ack_main=0:no_ackí3?s
void send_byte(uchar c) //?
??3?
uchar read_byte(void) //¤
l??3?
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ü Nf
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void send_to_byte(uchar ad_main,uchar c) //_í01?
q?
?3?
void send_to_nbyte(uchar ad_main,uchar ad_sub,uchar
*buf,uchar num)
//_μ01? q?
3?
void read_from_byte(uchar ad_main,uchar *buf) //Ví01
? q ?3?
void read_from_nbyte(uchar ad_main,uchar ad_sub,uchar
*buf,uchar num)
//Vμ01? q ?3?
C51 ??÷}
hóq <i2cbus.h>?l
#define uchar unsigned char
#define uint unsigned int
//nop·
7?
?l
#define nops()
{_nop_();_nop_();_nop_();_nop_();_nop_();}
//
gê?l V??
sbit sda=P0^0;
sbit scl=P0^1;
//
=?
?l
uchar i2c_ad_main; // qV1?
uchar i2c_ad_sub; // q01?
uchar *i2c_buf; //?
|¤
l
u
uchar i2c_num; //?
|¤
l
?
#define ack 1 //??s
#define no_ack 0 //V?s
C51?? <i2cbus.c>}
,
i nclude <reg51.h>
i nclude <intrins.h>
i nclude <i2cbus.h>
//**********************************
************
//
Sê sda=1->0
void i2c_start(void){
scl=0;
sda=1;
_nop_();
scl=1;
nops();
sda=0;
nops();
scl=0;
}
//
T?ê sda=0->1
void i2c_stop(void){
scl=0;
_nop_();
sda=0;
_nop_();
scl=1;
nops();
sda=1;
nops();
scl=0;
}
//??s (c ack:sda=0
no_ack:sda=0)
void i2c_ack_main(bit ack_main){
scl=0;
if(ack_main)sda=0; //ack??s
else sda=1; //no_ackí3?s
nops();
scl=1;
nops();
scl=0;
}
//3??
??
//?
c( V[
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?a¤
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//? I
nV?sê
void send_byte(uchar c){
uchar i;
for(i=0;i<8;i++){
scl=0;
if((c<<i) & 0x80)sda=1; //
?
ê
else sda=0;
_nop_();
scl=1;
nops();
scl=0;
}
nops();
sda=1; //?
? 8bit
db9L!¤
l?sê
_nop_();
scl=1;
nops(); //sda
'
^V?sê
scl=0; //? I
nV?sê |?1 e?z
H?
}
//3?¤
l??
//¤
l q. ?￥
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|i2c_ack_main()
P¨
//return,uchar? 13?
uchar read_byte(void){
uchar i;
uchar c;
c=0;
scl=0;
_nop_();
sda=1; //?
L1
{ ?Z
T
for(i=0;i<8;i++){
_nop_();
scl=0; //?
HòL1?!¤
l
ê
nops();
scl=1; //?
HòL1ú
P
L
μr
_nop_();
c<<=1;
if(sda)c+=1; //
ê|¤
l￥
i c
}
scl=0;
return c;
}
//_í01? q?
?3?
void send_to_byte(uchar ad_main,uchar c){
i2c_start();
send_byte(ad_main); //?
q1?
send_byte(c); //?
c
i2c_stop();
}
//***************************************************
//_μ01? q?
3?
void send_to_nbyte(uchar ad_main,uchar ad_sub,uchar
*buf,uchar num){
uchar i;
i2c_start();
send_byte(ad_main); //?
q1?
send_byte(ad_sub); //?
q01?
for(i=0;i<num;i++){
send_byte(*buf); //?
*buf
buf++;
}
i2c_stop();
}
//Ví01? q ?3?
//function: q1?
i ¤
l
u? -3?
void read_from_byte(uchar ad_main,uchar *buf){
i2c_start();
send_byte(ad_main); //?
q1?
*buf=read_byte();
i2c_ack_main(no_ack); //í3?s <no_ack=0>
i2c_stop();
}
//***************************************************
//Vμ01? q ?3?
//function,
void read_from_nbyte(uchar ad_main,uchar ad_sub,uchar
*buf,uchar num){
uchar i;
i2c_start();
send_byte(ad_main);
send_byte(ad_sub);
for(i=0;i<num-1;i++){
*buf=read_byte();
i2c_ack_main(ack); //??s <ack=1>
buf++;
}
*buf=read_byte;
buf++; //'Q·???íil
"￥
^?Ta buf·_/
B1?
i2c_ack_main(no_ack); //í3?s <no_ack=0>
i2c_stop();
}
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yN31
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rPUPF |= 0x3; //pull-up disable
2,IIC?
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pISR_IIC= (unsigned)IIC_Int;
//|
|
IIC ?) ???·?·_ IIC_Int
rINTMSK= ~ (BIT_GLOBAL|BIT_IIC);
//
P
?
3,
S IIC ¤ g
IICCON é?
!?
rIICCON = (1<<7) | (0<<6 ) | (1<<5) | (0xf );
//
P
ACK￥á
3,IICCLK=MCLK/16,
P
?
/¤
l? b" pending ê[LY?
//? Tx clock"
64MHz/16/
15+1
= 250KHz
4,_ 24LC04B? ?
0??
#define IICBUFSIZE 0x20
U8 _iicData[IICBUFSIZE]; //
i
volatile int _iicDataCount; //
é
volatile int _iicStatus;
volatile int _iicMode;
int _iicPt;
void Wr24LCxx(U32 slvAddr,U32 addr,U8 data)
{
_iicMode=WRDATA; //
T
_iicPt=0;
_iicData[0]=(U8)addr; //3? ?
T
ì
T
? I??
= ?
_iicData[1]=data;
_iicDataCount=2;
rIICDS=0xa0 // e?3?
rIICSTAT=0xf0; //?
!!?
Tá
3
SHq
P
?
/¤
l
while(_iicDataCount != -1);
_iicMode=POLLACK;
while(1)
{
rIICDS=slvAddr;
_iicStatus=0x100;
rIICSTAT=0xf0; //MasTx,Start
rIICCON=0xaf; //resumes IIC operation.
while(_iicStatus==0x100);
if(!(_iicStatus&0x1))
break; // ??¤
l?
??¤
l?
ACK
}
rIICSTAT=0xd0; //á
3T?Hq
rIICCON=0xaf; //
db IIC ?T
Delay(1); }
5,V
V
24LC04B
0??
void Rd24LCxx(U32 slvAddr,U32 addr,U8 *data)
{
_iicMode=SETRDADDR;
_iicPt=0;
_iicData[0]=(U8)addr;
_iicDataCount=1;
rIICDS=slvAddr;
rIICSTAT=0xf0; //MasTx,Start
while(_iicDataCount != -1);
_iicMode=RDDATA;
_iicPt=0;
_iicDataCount=1;
rIICDS=slvAddr;
rIICSTAT=0xb0; //MasRx,Start
rIICCON=0xaf; //resumes IIC operation.
while(_iicDataCount != -1);
*data=_iicData[1];
}
6,IIC?) ?0??
void __irq IIC_Int (void)
{
U32 iicSt,i ;
rI_ISPC=BIT_IIC; // b"pending ê
iicSt=rIICSTAT; // ? IIC 9L? -
[
Lé?ò?p) ?
if(iicSt&0x8){} // when bus arbitration is failed.
if(iicSt&0x4){} // when a slave address is
matched with IICADD
if(iicSt&0x2){} // when a slave address is
0000000b
if(iicSt&0x1){} // when ACK isn't received
switch(_iicMode) //? ? -?T
Té?M?) ?
{
case POLLACK,//?? ACK
T
_iicStatus=iicSt; // ? IICSTAT?
?
0 êV
U
^?
¤
l?
¤
l?
ACK
break;
case RDDATA,//
T
if((_iicDataCount --)==0) //o1 | 1 3?
{
_iicData[_iicPt++]=rIICDS;
rIICSTAT=0x90; //T??
!! |
T
rIICCON=0xaf; //
db IIC ?T
Delay(1); //??°?T?Hq T¨
break;
}
_iicData[_iicPt++]=rIICDS;
//? ?
μ
KaB?3??
á
3 ACK
if((_iicDataCount)==0) // ?T ?
μ
KaB?3
?
rIICCON=0x2f; // á
3 NOACK.
db IIC ?T
else
rIICCON=0xaf; // á
3 ACK
db IIC ?T
break;
case WRDATA,//
T
if((_iicDataCount--)==0) // ?T
?
{
rIICSTAT=0xd0; //T??
!!?
.
{
rIICCON=0xaf; //ˉ
ˉ
IIC ?T
Delay(1); //??°?T?Hq r
break;
}
rIICDS=_iicData[_iicPt++]; //_iicData[0] has dummy.
for(i=0;i<10;i++);
//for setup time until rising edge of IICSCL
rIICCON=0xaf; //
db IIC 9L?T
break;
case SETRDADDR,//
!? 1?
T
//Uart_Printf("[S%d]",_iicDataCount);
if((_iicDataCount--)==0)
{
break;
//IIC operation is stopped because of IICCON[4]
}
rIICDS=_iicData[_iicPt++]
for(i=0;i<10;i++);
//for setup time until rising edge of IICSCL
rIICCON=0xaf; //
db IIC 9L?T
break;
default:
break;
}
}
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L
sbit scl=P0^1; //I2C q SCL
HòL
#define nops() {_nop_();_nop_();_nop_();_nop_();_nop_();}
//nop·
7?
?l
uchar i2c_ad_main; // qV1?
uchar i2c_ad_sub; // q01?
uchar *i2c_buf; //?
/¤
l
u
uchar i2c_num; //?
/¤
l
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a
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void i2c_start(void) //
Sê
void i2c_stop(void) //
T?ê
void i2c_ack_main(bit ack_main) //??s
a
ü ack_main=1:ack??s
ack_main=0:no_ackí3?s
void send_byte(uchar c) //?
??3?
uchar read_byte(void) //¤
l??3?
a
ü Nf
31
￥??s ?¨
vf
a
ü
I2C??¤ gf
V$?¨???¨
void send_to_byte(uchar ad_main,uchar c) //_í01?
q?
?3?
void send_to_nbyte(uchar ad_main,uchar ad_sub,uchar
*buf,uchar num)
//_μ01? q?
3?
void read_from_byte(uchar ad_main,uchar *buf) //Ví01
? q ?3?
void read_from_nbyte(uchar ad_main,uchar ad_sub,uchar
*buf,uchar num)
//Vμ01? q ?3?
C51 ??÷}
hóq <i2cbus.h>?l
#define uchar unsigned char
#define uint unsigned int
//nop·
7?
?l
#define nops()
{_nop_();_nop_();_nop_();_nop_();_nop_();}
//
gê?l V??
sbit sda=P0^0;
sbit scl=P0^1;
//
=?
?l
uchar i2c_ad_main; // qV1?
uchar i2c_ad_sub; // q01?
uchar *i2c_buf; //?
|¤
l
u
uchar i2c_num; //?
|¤
l
?
#define ack 1 //??s
#define no_ack 0 //V?s
C51?? <i2cbus.c>}
,
i nclude <reg51.h>
i nclude <intrins.h>
i nclude <i2cbus.h>
//**********************************
************
//
Sê sda=1->0
void i2c_start(void){
scl=0;
sda=1;
_nop_();
scl=1;
nops();
sda=0;
nops();
scl=0;
}
//
T?ê sda=0->1
void i2c_stop(void){
scl=0;
_nop_();
sda=0;
_nop_();
scl=1;
nops();
sda=1;
nops();
scl=0;
}
//??s (c ack:sda=0
no_ack:sda=0)
void i2c_ack_main(bit ack_main){
scl=0;
if(ack_main)sda=0; //ack??s
else sda=1; //no_ackí3?s
nops();
scl=1;
nops();
scl=0;
}
//3??
??
//?
c( V[
^
9 V
^1? )
?a¤
l
V?s
//? I
nV?sê
void send_byte(uchar c){
uchar i;
for(i=0;i<8;i++){
scl=0;
if((c<<i) & 0x80)sda=1; //
?
ê
else sda=0;
_nop_();
scl=1;
nops();
scl=0;
}
nops();
sda=1; //?
? 8bit
db9L!¤
l?sê
_nop_();
scl=1;
nops(); //sda
'
^V?sê
scl=0; //? I
nV?sê |?1 e?z
H?
}
//3?¤
l??
//¤
l q. ?￥
N???
￥ |??sf
|i2c_ack_main()
P¨
//return,uchar? 13?
uchar read_byte(void){
uchar i;
uchar c;
c=0;
scl=0;
_nop_();
sda=1; //?
L1
{ ?Z
T
for(i=0;i<8;i++){
_nop_();
scl=0; //?
HòL1?!¤
l
ê
nops();
scl=1; //?
HòL1ú
P
L
μr
_nop_();
c<<=1;
if(sda)c+=1; //
ê|¤
l￥
i c
}
scl=0;
return c;
}
//_í01? q?
?3?
void send_to_byte(uchar ad_main,uchar c){
i2c_start();
send_byte(ad_main); //?
q1?
send_byte(c); //?
c
i2c_stop();
}
//***************************************************
//_μ01? q?
3?
void send_to_nbyte(uchar ad_main,uchar ad_sub,uchar
*buf,uchar num){
uchar i;
i2c_start();
send_byte(ad_main); //?
q1?
send_byte(ad_sub); //?
q01?
for(i=0;i<num;i++){
send_byte(*buf); //?
*buf
buf++;
}
i2c_stop();
}
//Ví01? q ?3?
//function: q1?
i ¤
l
u? -3?
void read_from_byte(uchar ad_main,uchar *buf){
i2c_start();
send_byte(ad_main); //?
q1?
*buf=read_byte();
i2c_ack_main(no_ack); //í3?s <no_ack=0>
i2c_stop();
}
//***************************************************
//Vμ01? q ?3?
//function,
void read_from_nbyte(uchar ad_main,uchar ad_sub,uchar
*buf,uchar num){
uchar i;
i2c_start();
send_byte(ad_main);
send_byte(ad_sub);
for(i=0;i<num-1;i++){
*buf=read_byte();
i2c_ack_main(ack); //??s <ack=1>
buf++;
}
*buf=read_byte;
buf++; //'Q·???íil
"￥
^?Ta buf·_/
B1?
i2c_ack_main(no_ack); //í3?s <no_ack=0>
i2c_stop();
}
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yN31
!? PF0
PF1yT ? 2?
T/ b?¨[/?
rPCONF |= 0xa; //PF0:IICSCL,PF1:IICSDA
rPUPF |= 0x3; //pull-up disable
2,IIC?
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T
3
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LC
pISR_IIC= (unsigned)IIC_Int;
//|
|
IIC ?) ???·?·_ IIC_Int
rINTMSK= ~ (BIT_GLOBAL|BIT_IIC);
//
P
?
3,
S IIC ¤ g
IICCON é?
!?
rIICCON = (1<<7) | (0<<6 ) | (1<<5) | (0xf );
//
P
ACK￥á
3,IICCLK=MCLK/16,
P
?
/¤
l? b" pending ê[LY?
//? Tx clock"
64MHz/16/
15+1
= 250KHz
4,_ 24LC04B? ?
0??
#define IICBUFSIZE 0x20
U8 _iicData[IICBUFSIZE]; //
i
volatile int _iicDataCount; //
é
volatile int _iicStatus;
volatile int _iicMode;
int _iicPt;
void Wr24LCxx(U32 slvAddr,U32 addr,U8 data)
{
_iicMode=WRDATA; //
T
_iicPt=0;
_iicData[0]=(U8)addr; //3? ?
T
ì
T
? I??
= ?
_iicData[1]=data;
_iicDataCount=2;
rIICDS=0xa0 // e?3?
rIICSTAT=0xf0; //?
!!?
Tá
3
SHq
P
?
/¤
l
while(_iicDataCount != -1);
_iicMode=POLLACK;
while(1)
{
rIICDS=slvAddr;
_iicStatus=0x100;
rIICSTAT=0xf0; //MasTx,Start
rIICCON=0xaf; //resumes IIC operation.
while(_iicStatus==0x100);
if(!(_iicStatus&0x1))
break; // ??¤
l?
??¤
l?
ACK
}
rIICSTAT=0xd0; //á
3T?Hq
rIICCON=0xaf; //
db IIC ?T
Delay(1); }
5,V
V
24LC04B
0??
void Rd24LCxx(U32 slvAddr,U32 addr,U8 *data)
{
_iicMode=SETRDADDR;
_iicPt=0;
_iicData[0]=(U8)addr;
_iicDataCount=1;
rIICDS=slvAddr;
rIICSTAT=0xf0; //MasTx,Start
while(_iicDataCount != -1);
_iicMode=RDDATA;
_iicPt=0;
_iicDataCount=1;
rIICDS=slvAddr;
rIICSTAT=0xb0; //MasRx,Start
rIICCON=0xaf; //resumes IIC operation.
while(_iicDataCount != -1);
*data=_iicData[1];
}
6,IIC?) ?0??
void __irq IIC_Int (void)
{
U32 iicSt,i ;
rI_ISPC=BIT_IIC; // b"pending ê
iicSt=rIICSTAT; // ? IIC 9L? -
[
Lé?ò?p) ?
if(iicSt&0x8){} // when bus arbitration is failed.
if(iicSt&0x4){} // when a slave address is
matched with IICADD
if(iicSt&0x2){} // when a slave address is
0000000b
if(iicSt&0x1){} // when ACK isn't received
switch(_iicMode) //? ? -?T
Té?M?) ?
{
case POLLACK,//?? ACK
T
_iicStatus=iicSt; // ? IICSTAT?
?
0 êV
U
^?
¤
l?
¤
l?
ACK
break;
case RDDATA,//
T
if((_iicDataCount --)==0) //o1 | 1 3?
{
_iicData[_iicPt++]=rIICDS;
rIICSTAT=0x90; //T??
!! |
T
rIICCON=0xaf; //
db IIC ?T
Delay(1); //??°?T?Hq T¨
break;
}
_iicData[_iicPt++]=rIICDS;
//? ?
μ
KaB?3??
á
3 ACK
if((_iicDataCount)==0) // ?T ?
μ
KaB?3
?
rIICCON=0x2f; // á
3 NOACK.
db IIC ?T
else
rIICCON=0xaf; // á
3 ACK
db IIC ?T
break;
case WRDATA,//
T
if((_iicDataCount--)==0) // ?T
?
{
rIICSTAT=0xd0; //T??
!!?
.
{
rIICCON=0xaf; //ˉ
ˉ
IIC ?T
Delay(1); //??°?T?Hq r
break;
}
rIICDS=_iicData[_iicPt++]; //_iicData[0] has dummy.
for(i=0;i<10;i++);
//for setup time until rising edge of IICSCL
rIICCON=0xaf; //
db IIC 9L?T
break;
case SETRDADDR,//
!? 1?
T
//Uart_Printf("[S%d]",_iicDataCount);
if((_iicDataCount--)==0)
{
break;
//IIC operation is stopped because of IICCON[4]
}
rIICDS=_iicData[_iicPt++]
for(i=0;i<10;i++);
//for setup time until rising edge of IICSCL
rIICCON=0xaf; //
db IIC 9L?T
break;
default:
break;
}
}
L
? IIC
L
?
Sê SCL"1
H SDA
μ/?ü
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