I'm designing a new board with LPC2378/88 and I have to read the code
inside a Maxim DS2401 chip using the 1-wire protocol.
Which peripheral is suggested for this type of communication?
Any sample code is available for the LPC2xxx family?
1-wire driver
Started by ●September 15, 2008
Reply by ●September 15, 20082008-09-15
You can use ext. int. for rx and any gpio for tx. For first presence pulse you
shold use ext int. and than set that pin as gpio. You can read application note
159 from dallas.
I attached source codes you will need. You can use
if(iIbutton == TRUE)
{
if(ibuttonReset() == 0)
{
if(ibuttonReadSerial(ibuttonSerial) == TRUE)
{
isIbutton = FALSE;
return TRUE;
}
}
}
----- Original Message ----
From: carlochiesa78
To: l...
Sent: Monday, September 15, 2008 6:53:44 PM
Subject: [lpc2000] 1-wire driver
I'm designing a new board with LPC2378/88 and I have to read the code
inside a Maxim DS2401 chip using the 1-wire protocol.
Which peripheral is suggested for this type of communication?
Any sample code is available for the LPC2xxx family?
----------
//---
// Function......: extInt3ISR
// Description...: external interrupt ISR
// Return Value..: ...
// Parameters....: ...
//---
void extInt3ISR(void) __irq
{
interruptClose(EXTERNAL3_INTERRUPT);
arm_gpioSetPinAsGpio(P0PIN20);
delayUs(7000);
isIbutton = TRUE;
interruptRelease();
}
//---
// Function......: extIntInit
// Description...: external interrupt ilk derleri
// Return Value..: ...
// Parameters....: ...
//---
void extIntInit(void)
//---
{
arm_gpioSetPinFunction(P0PIN20, PIN_FUNC_THIRD_ALTERNATE);
EXTINT = 0x08; //extint3, clearlenir
EXTPOLAR = 0x00; //den kenar
EXTMODE = 0x08; //extint3, kenar duyarlbr />
interruptOpen(EXTERNAL3_INTERRUPT, extInt3ISR);
}
//---
// Function......: setSpeed
// Description...: ibutton haberleme hayarlar
// standart in (standard=1), overdrive in (standard=0).
// Return Value..: herhangi bir ibutton bulursa 0 bulamazsa 1 dd
// Parameters....: ...
//---
void setSpeed(u8 standard)
{
if (standard)
{
// Standard Speed
A = 6;
B = 64;
C = 60;
D = 10;
E = 9;
F = 55;
G = 0;
H = 480;
I = 70;
J = 410;
}
else
{
// Overdrive Speed
A = 2;
B = 8;
C = 8;
D = 8;
E = 1;
F = 7;
G = 3;
H = 70;
I = 9;
J = 40;
}
}
//---
// Function......: ibuttonReset
// Description...: 1-Wire hattresetler ve ibutton var sinyali bekler
// Return Value..: herhangi bir ibutton bulursa 0 bulamazsa 1 dd
// Parameters....: ...
//---
u8 ibuttonReset(void)
{
u8 result = 1;
delayUs(G);
gpioSetPin(IBUTTON_TX);
delayUs(H);
gpioClearPin(IBUTTON_TX);
delayUs(I);
result = gpioReadPin(IBUTTON_RX);
delayUs(J); // Complete the reset sequence recovery
return result;
}
//---
// Function......: ibuttonWriteBit
// Description...: ibutton a 1 bit yazar
// Return Value..:
// Parameters....: ...
//---
void ibuttonWriteBit(u8 bit)
{
if (bit)
{
// Write '1' bit
gpioSetPin(IBUTTON_TX);
delayUs(A);
gpioClearPin(IBUTTON_TX);
delayUs(B); // Complete the time slot and 10us recovery
}
else
{
// Write '0' bit
gpioSetPin(IBUTTON_TX);
delayUs(C);
gpioClearPin(IBUTTON_TX);
delayUs(D);
}
}
//---
// Function......: ibuttonReadBit
// Description...: ibutton dan 1 bit okur
// Return Value..:
// Parameters....: ...
//---
u8 ibuttonReadBit(void)
{
u8 result;
gpioSetPin(IBUTTON_TX);
delayUs(A);
gpioClearPin(IBUTTON_TX);
delayUs(E);
result = gpioReadPin(IBUTTON_RX);
delayUs(F);
return result;
}
//---
// Function......: ibuttonWriteByte
// Description...: ibutton a 1 byte yazar
// Return Value..:
// Parameters....: ...
//---
void ibuttonWriteByte(u8 data)
{
u8 loop;
// Loop to write each bit in the byte, LS-bit first
for (loop = 0; loop < 8; loop++)
{
ibuttonWriteBit(data & 0x01);
// shift the data byte for the next bit
data >>= 1;
}
}
//---
// Function......: ibuttonReadByte
// Description...: ibutton dan 1 byte okur
// Return Value..:
// Parameters....: ...
//---
u8 ibuttonReadByte(void)
{
u8 loop, result=0;
for (loop = 0; loop < 8; loop++)
{
// shift the result to get it ready for the next bit
result >>= 1;
// if result is one, then set MS bit
if (ibuttonReadBit())
result |= 0x80;
}
return result;
}
//---
// Function......: ibuttonTouchByte
// Description...: Ezamanlokuma ve yazma(data '1' ise oku '0' yaz)
// Return Value..: 0(yazma durumunda) veya okunan bit deri
// Parameters....:
//---
//ibuttonTouchByte(0xFF) == ibuttonReadByte()
//ibuttonTouchByte(0xFF) == ibuttonReadByte()
u8 ibuttonTouchByte(u8 data)
{
u8 loop, result=0;
for (loop = 0; loop < 8; loop++)
{
// shift the result to get it ready for the next bit
result >>= 1;
// If sending a '1' then read a bit else write a '0'
if (data & 0x01)
{
if (ibuttonReadBit())
result |= 0x80;
}
else
ibuttonWriteBit(0);
// shift the data byte for the next bit
data >>= 1;
}
return result;
}
//---
// Function......: ibuttonBlock
// Description...: aynbuffer erinden ezamanlokuma ve yazma
// Return Value..:
// Parameters....:
//---
void ibuttonBlock(u8 *data, u8 data_len)
{
u8 loop;
for (loop = 0; loop < data_len; loop++)
{
data[loop] = ibuttonTouchByte(data[loop]);
}
}
//---
// Function......: ibuttonReadSerial
// Description...: read rom(33h),
// Return Value..:
// Parameters....:
//---
bool ibuttonReadSerial(u8 *serialArray)
{
u8 i, crc = 0;
setSpeed(1); //standart hda haberle
ibuttonWriteByte(0x33); //read rom
for(i = 0; i < 8; i++)
{
serialArray[i] = ibuttonReadByte();
crc = crcTable[crc ^ serialArray[i]];
}
if((serialArray[0] > 0) && (crc == 0))
{
return TRUE;
}
else
{
extIntInit();
return FALSE;
}
}
//
I attached source codes you will need. You can use
if(iIbutton == TRUE)
{
if(ibuttonReset() == 0)
{
if(ibuttonReadSerial(ibuttonSerial) == TRUE)
{
isIbutton = FALSE;
return TRUE;
}
}
}
----- Original Message ----
From: carlochiesa78
To: l...
Sent: Monday, September 15, 2008 6:53:44 PM
Subject: [lpc2000] 1-wire driver
I'm designing a new board with LPC2378/88 and I have to read the code
inside a Maxim DS2401 chip using the 1-wire protocol.
Which peripheral is suggested for this type of communication?
Any sample code is available for the LPC2xxx family?
----------
//---
// Function......: extInt3ISR
// Description...: external interrupt ISR
// Return Value..: ...
// Parameters....: ...
//---
void extInt3ISR(void) __irq
{
interruptClose(EXTERNAL3_INTERRUPT);
arm_gpioSetPinAsGpio(P0PIN20);
delayUs(7000);
isIbutton = TRUE;
interruptRelease();
}
//---
// Function......: extIntInit
// Description...: external interrupt ilk derleri
// Return Value..: ...
// Parameters....: ...
//---
void extIntInit(void)
//---
{
arm_gpioSetPinFunction(P0PIN20, PIN_FUNC_THIRD_ALTERNATE);
EXTINT = 0x08; //extint3, clearlenir
EXTPOLAR = 0x00; //den kenar
EXTMODE = 0x08; //extint3, kenar duyarlbr />
interruptOpen(EXTERNAL3_INTERRUPT, extInt3ISR);
}
//---
// Function......: setSpeed
// Description...: ibutton haberleme hayarlar
// standart in (standard=1), overdrive in (standard=0).
// Return Value..: herhangi bir ibutton bulursa 0 bulamazsa 1 dd
// Parameters....: ...
//---
void setSpeed(u8 standard)
{
if (standard)
{
// Standard Speed
A = 6;
B = 64;
C = 60;
D = 10;
E = 9;
F = 55;
G = 0;
H = 480;
I = 70;
J = 410;
}
else
{
// Overdrive Speed
A = 2;
B = 8;
C = 8;
D = 8;
E = 1;
F = 7;
G = 3;
H = 70;
I = 9;
J = 40;
}
}
//---
// Function......: ibuttonReset
// Description...: 1-Wire hattresetler ve ibutton var sinyali bekler
// Return Value..: herhangi bir ibutton bulursa 0 bulamazsa 1 dd
// Parameters....: ...
//---
u8 ibuttonReset(void)
{
u8 result = 1;
delayUs(G);
gpioSetPin(IBUTTON_TX);
delayUs(H);
gpioClearPin(IBUTTON_TX);
delayUs(I);
result = gpioReadPin(IBUTTON_RX);
delayUs(J); // Complete the reset sequence recovery
return result;
}
//---
// Function......: ibuttonWriteBit
// Description...: ibutton a 1 bit yazar
// Return Value..:
// Parameters....: ...
//---
void ibuttonWriteBit(u8 bit)
{
if (bit)
{
// Write '1' bit
gpioSetPin(IBUTTON_TX);
delayUs(A);
gpioClearPin(IBUTTON_TX);
delayUs(B); // Complete the time slot and 10us recovery
}
else
{
// Write '0' bit
gpioSetPin(IBUTTON_TX);
delayUs(C);
gpioClearPin(IBUTTON_TX);
delayUs(D);
}
}
//---
// Function......: ibuttonReadBit
// Description...: ibutton dan 1 bit okur
// Return Value..:
// Parameters....: ...
//---
u8 ibuttonReadBit(void)
{
u8 result;
gpioSetPin(IBUTTON_TX);
delayUs(A);
gpioClearPin(IBUTTON_TX);
delayUs(E);
result = gpioReadPin(IBUTTON_RX);
delayUs(F);
return result;
}
//---
// Function......: ibuttonWriteByte
// Description...: ibutton a 1 byte yazar
// Return Value..:
// Parameters....: ...
//---
void ibuttonWriteByte(u8 data)
{
u8 loop;
// Loop to write each bit in the byte, LS-bit first
for (loop = 0; loop < 8; loop++)
{
ibuttonWriteBit(data & 0x01);
// shift the data byte for the next bit
data >>= 1;
}
}
//---
// Function......: ibuttonReadByte
// Description...: ibutton dan 1 byte okur
// Return Value..:
// Parameters....: ...
//---
u8 ibuttonReadByte(void)
{
u8 loop, result=0;
for (loop = 0; loop < 8; loop++)
{
// shift the result to get it ready for the next bit
result >>= 1;
// if result is one, then set MS bit
if (ibuttonReadBit())
result |= 0x80;
}
return result;
}
//---
// Function......: ibuttonTouchByte
// Description...: Ezamanlokuma ve yazma(data '1' ise oku '0' yaz)
// Return Value..: 0(yazma durumunda) veya okunan bit deri
// Parameters....:
//---
//ibuttonTouchByte(0xFF) == ibuttonReadByte()
//ibuttonTouchByte(0xFF) == ibuttonReadByte()
u8 ibuttonTouchByte(u8 data)
{
u8 loop, result=0;
for (loop = 0; loop < 8; loop++)
{
// shift the result to get it ready for the next bit
result >>= 1;
// If sending a '1' then read a bit else write a '0'
if (data & 0x01)
{
if (ibuttonReadBit())
result |= 0x80;
}
else
ibuttonWriteBit(0);
// shift the data byte for the next bit
data >>= 1;
}
return result;
}
//---
// Function......: ibuttonBlock
// Description...: aynbuffer erinden ezamanlokuma ve yazma
// Return Value..:
// Parameters....:
//---
void ibuttonBlock(u8 *data, u8 data_len)
{
u8 loop;
for (loop = 0; loop < data_len; loop++)
{
data[loop] = ibuttonTouchByte(data[loop]);
}
}
//---
// Function......: ibuttonReadSerial
// Description...: read rom(33h),
// Return Value..:
// Parameters....:
//---
bool ibuttonReadSerial(u8 *serialArray)
{
u8 i, crc = 0;
setSpeed(1); //standart hda haberle
ibuttonWriteByte(0x33); //read rom
for(i = 0; i < 8; i++)
{
serialArray[i] = ibuttonReadByte();
crc = crcTable[crc ^ serialArray[i]];
}
if((serialArray[0] > 0) && (crc == 0))
{
return TRUE;
}
else
{
extIntInit();
return FALSE;
}
}
//
Reply by ●September 16, 20082008-09-16
Thank you for your suggestions.
I tryed to compile your code but I got an error in setSpeed() function
for H and J standard values because I assumed that their size is 8-bits.
ibutton.c(97): warning: #69-D: integer conversion resulted in truncation
ibutton.c(99): warning: #69-D: integer conversion resulted in truncation
And the delayUs() function really accepts microseconds as input?
Moreover what do you mean with the functions
interrupt[Open|Close|Release]() ?
I tryed to compile your code but I got an error in setSpeed() function
for H and J standard values because I assumed that their size is 8-bits.
ibutton.c(97): warning: #69-D: integer conversion resulted in truncation
ibutton.c(99): warning: #69-D: integer conversion resulted in truncation
And the delayUs() function really accepts microseconds as input?
Moreover what do you mean with the functions
interrupt[Open|Close|Release]() ?
Reply by ●September 16, 20082008-09-16
Yes you are right for H and J it is error.
delayUs() really accept microseconds as input.
int. open:
write vector register
write ctrl register
write enable register
int. close:
write enable clear register
int. release:
VICVectAddr = 0x00000000;
----- Original Message ----
From: carlochiesa78
To: l...
Sent: Tuesday, September 16, 2008 11:04:12 AM
Subject: [lpc2000] Re: 1-wire driver
Thank you for your suggestions.
I tryed to compile your code but I got an error in setSpeed() function
for H and J standard values because I assumed that their size is 8-bits.
ibutton.c(97) : warning: #69-D: integer conversion resulted in truncation
ibutton.c(99) : warning: #69-D: integer conversion resulted in truncation
And the delayUs() function really accepts microseconds as input?
Moreover what do you mean with the functions
interrupt[Open| Close|Release] () ?
delayUs() really accept microseconds as input.
int. open:
write vector register
write ctrl register
write enable register
int. close:
write enable clear register
int. release:
VICVectAddr = 0x00000000;
----- Original Message ----
From: carlochiesa78
To: l...
Sent: Tuesday, September 16, 2008 11:04:12 AM
Subject: [lpc2000] Re: 1-wire driver
Thank you for your suggestions.
I tryed to compile your code but I got an error in setSpeed() function
for H and J standard values because I assumed that their size is 8-bits.
ibutton.c(97) : warning: #69-D: integer conversion resulted in truncation
ibutton.c(99) : warning: #69-D: integer conversion resulted in truncation
And the delayUs() function really accepts microseconds as input?
Moreover what do you mean with the functions
interrupt[Open| Close|Release] () ?
Reply by ●September 16, 20082008-09-16
Hi Mehmet,
is it OK if I use your code in an open source project (http://www.vscp.org)?
Cheers
/Ake
On Tue, Sep 16, 2008 at 1:59 PM, Mehmet Kurnaz wrote:
> Yes you are right for H and J it is error.
> delayUs() really accept microseconds as input.
>
> int. open:
> write vector register
> write ctrl register
> write enable register
> int. close:
> write enable clear register
> int. release:
> VICVectAddr = 0x00000000;
>
> ----- Original Message ----
> From: carlochiesa78
> To: l...
> Sent: Tuesday, September 16, 2008 11:04:12 AM
> Subject: [lpc2000] Re: 1-wire driver
>
> Thank you for your suggestions.
>
> I tryed to compile your code but I got an error in setSpeed() function
> for H and J standard values because I assumed that their size is 8-bits.
>
> ibutton.c(97) : warning: #69-D: integer conversion resulted in truncation
> ibutton.c(99) : warning: #69-D: integer conversion resulted in truncation
>
> And the delayUs() function really accepts microseconds as input?
>
> Moreover what do you mean with the functions
> interrupt[Open| Close|Release] () ?
>
>
--
---
Ake Hedman (YAP - Yet Another Programmer)
D of Scandinavia, Brattbergavagen 17, 820 50 LOS, Sweden
Phone: (46) 73 0533 146
Company home: http://www.dofscandinavia.com
Personal homepage: http://www.dofscandinavia.com/akhe
Automated home: http://www.vscp.org
is it OK if I use your code in an open source project (http://www.vscp.org)?
Cheers
/Ake
On Tue, Sep 16, 2008 at 1:59 PM, Mehmet Kurnaz wrote:
> Yes you are right for H and J it is error.
> delayUs() really accept microseconds as input.
>
> int. open:
> write vector register
> write ctrl register
> write enable register
> int. close:
> write enable clear register
> int. release:
> VICVectAddr = 0x00000000;
>
> ----- Original Message ----
> From: carlochiesa78
> To: l...
> Sent: Tuesday, September 16, 2008 11:04:12 AM
> Subject: [lpc2000] Re: 1-wire driver
>
> Thank you for your suggestions.
>
> I tryed to compile your code but I got an error in setSpeed() function
> for H and J standard values because I assumed that their size is 8-bits.
>
> ibutton.c(97) : warning: #69-D: integer conversion resulted in truncation
> ibutton.c(99) : warning: #69-D: integer conversion resulted in truncation
>
> And the delayUs() function really accepts microseconds as input?
>
> Moreover what do you mean with the functions
> interrupt[Open| Close|Release] () ?
>
>
--
---
Ake Hedman (YAP - Yet Another Programmer)
D of Scandinavia, Brattbergavagen 17, 820 50 LOS, Sweden
Phone: (46) 73 0533 146
Company home: http://www.dofscandinavia.com
Personal homepage: http://www.dofscandinavia.com/akhe
Automated home: http://www.vscp.org
Reply by ●September 16, 20082008-09-16
Ok there is no problem.
----- Original Message ----
From: YAP
To: l...
Sent: Tuesday, September 16, 2008 3:48:41 PM
Subject: Re: [lpc2000] Re: 1-wire driver
Hi Mehmet,
is it OK if I use your code in an open source project (http://www.vscp. org)?
Cheers
/Ake
On Tue, Sep 16, 2008 at 1:59 PM, Mehmet Kurnaz wrote:
> Yes you are right for H and J it is error.
> delayUs() really accept microseconds as input.
>
> int. open:
> write vector register
> write ctrl register
> write enable register
> int. close:
> write enable clear register
> int. release:
> VICVectAddr = 0x00000000;
>
> ----- Original Message ----
> From: carlochiesa78
> To: lpc2000@yahoogroups .com
> Sent: Tuesday, September 16, 2008 11:04:12 AM
> Subject: [lpc2000] Re: 1-wire driver
>
> Thank you for your suggestions.
>
> I tryed to compile your code but I got an error in setSpeed() function
> for H and J standard values because I assumed that their size is 8-bits.
>
> ibutton.c(97) : warning: #69-D: integer conversion resulted in truncation
> ibutton.c(99) : warning: #69-D: integer conversion resulted in truncation
>
> And the delayUs() function really accepts microseconds as input?
>
> Moreover what do you mean with the functions
> interrupt[Open| Close|Release] () ?
>
>
--
---
Ake Hedman (YAP - Yet Another Programmer)
D of Scandinavia, Brattbergavagen 17, 820 50 LOS, Sweden
Phone: (46) 73 0533 146
Company home: http://www.dofscand inavia.com
Personal homepage: http://www.dofscand inavia.com/ akhe
Automated home: http://www.vscp. org
----- Original Message ----
From: YAP
To: l...
Sent: Tuesday, September 16, 2008 3:48:41 PM
Subject: Re: [lpc2000] Re: 1-wire driver
Hi Mehmet,
is it OK if I use your code in an open source project (http://www.vscp. org)?
Cheers
/Ake
On Tue, Sep 16, 2008 at 1:59 PM, Mehmet Kurnaz wrote:
> Yes you are right for H and J it is error.
> delayUs() really accept microseconds as input.
>
> int. open:
> write vector register
> write ctrl register
> write enable register
> int. close:
> write enable clear register
> int. release:
> VICVectAddr = 0x00000000;
>
> ----- Original Message ----
> From: carlochiesa78
> To: lpc2000@yahoogroups .com
> Sent: Tuesday, September 16, 2008 11:04:12 AM
> Subject: [lpc2000] Re: 1-wire driver
>
> Thank you for your suggestions.
>
> I tryed to compile your code but I got an error in setSpeed() function
> for H and J standard values because I assumed that their size is 8-bits.
>
> ibutton.c(97) : warning: #69-D: integer conversion resulted in truncation
> ibutton.c(99) : warning: #69-D: integer conversion resulted in truncation
>
> And the delayUs() function really accepts microseconds as input?
>
> Moreover what do you mean with the functions
> interrupt[Open| Close|Release] () ?
>
>
--
---
Ake Hedman (YAP - Yet Another Programmer)
D of Scandinavia, Brattbergavagen 17, 820 50 LOS, Sweden
Phone: (46) 73 0533 146
Company home: http://www.dofscand inavia.com
Personal homepage: http://www.dofscand inavia.com/ akhe
Automated home: http://www.vscp. org
Reply by ●September 16, 20082008-09-16
On Tue, Sep 16, 2008 at 8:02 PM, Mehmet Kurnaz wrote:
> Ok there is no problem.
Thanks a lot!
Cheers
/Ake
---
Ake Hedman (YAP - Yet Another Programmer)
D of Scandinavia, Brattbergavagen 17, 820 50 LOS, Sweden
Phone: (46) 73 0533 146
Company home: http://www.dofscandinavia.com
Personal homepage: http://www.dofscandinavia.com/akhe
Automated home: http://www.vscp.org
> Ok there is no problem.
Thanks a lot!
Cheers
/Ake
---
Ake Hedman (YAP - Yet Another Programmer)
D of Scandinavia, Brattbergavagen 17, 820 50 LOS, Sweden
Phone: (46) 73 0533 146
Company home: http://www.dofscandinavia.com
Personal homepage: http://www.dofscandinavia.com/akhe
Automated home: http://www.vscp.org
