Arduino I2C pin inputs - NYCResistor:Microcontrollers

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Message from discussion Arduino I2C pin inputs
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Subject: Re: [NYCR:Microcontrollers] Arduino I2C pin inputs
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From: Joel Murphy <j...@joelmurphy.net>
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Date: Tue, 20 Mar 2012 23:33:39 -0400
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Meant to add the only other issue is timing. datasheets will have a good sta=
rting point for trial and error to get a workable clock with delays. Longer t=
ransmission streams, longer tweeking.... But totally doable. I wrote a softw=
are I2C in PICBasic years ago.

Making the world safe for robots
-----------
Any noise in the prior signal has been inserted by the iThing

On Mar 20, 2012, at 11:18 PM, Joel Murphy <j...@joelmurphy.net> wrote:

> I2C is implemented in hardware on arduino pins A4 and A5. A whole pile of c=
ontrol registers make it easy to run the protocol with internal flags and in=
terrupts. Its fairly complex The back and forth -ness of it, with acknowledg=
e bits flying (or not flying) every where and changing pin MODE statesWire l=
ibrary mucks about in those control registers, so it's not possible to run W=
ire on anyy other pins.=20
> Your next recourse software. There's plenty of I2C waveform data out there=
 and in the datasheet for the DS1307 to make it doable. The bits and bytes c=
ommands in arduino make the code easy to debug.
>=20
> Making the world safe for robots
> -----------
> Any noise in the prior signal has been inserted by the iThing
>=20
> On Mar 20, 2012, at 10:11 PM, Guan Yang <g...@yang.dk> wrote:
>=20
>> I am pretty sure Wire uses hardware support for I2C that requires those p=
articular pins. In theory you could implement I2C like SoftwareSerial for as=
ync serial, that would run on any pin (or any pin with an interrupt), but I h=
aven't seen such an implementation.
>>=20
>> What's on those pins? Can you move it?
>> On Tuesday, March 20, 2012 at 21:00, Adrienne Humblet wrote:
>>=20
>>> Hi,
>>>=20
>>> I'm trying to hook up a DS1307 RTC chip to an Arduino Uno. The DS1307
>>> uses the I2C bus which requires 2 connection to the Arduino. The
>>> Wire.h library (which is what the Arduino uses for I2C protocol)
>>> expects the SDA (serial data) and SCK (serial clock) connections in
>>> the Analog 4 and Analog 5 pins of the Arduino.
>>>=20
>>> Does anyone know how to make it such that the Wire library expects SDA
>>> and SCK in other pins? Pins A4 and A5 are already taken up by other
>>> non I2C devices.
>>>=20
>>> Does anyone know what I'm talking about?
>>>=20
>>> I thought it would be easy, but when I look in Wire.h I don't see any
>>> pin assignments.
>>>=20
>>> Thanks!
>>> -Adrienne
>>>=20
>>> --
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>>=20
>> --=20
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<html><head></head><body bgcolor=3D"#FFFFFF"><div>Meant to add the only othe=
r issue is timing. datasheets will have a good starting point for trial and e=
rror to get a workable clock with delays. Longer transmission streams, longe=
r tweeking.... But totally doable. I wrote a software I2C in PICBasic years a=
go.<br><br>Making the world safe for robots<div>-----------</div><div>Any no=
ise in the prior signal has been inserted by the iThing</div></div><div><br>=
On Mar 20, 2012, at 11:18 PM, Joel Murphy &lt;<a href=3D"mailto:joel@joelmur=
phy.net">j...@joelmurphy.net</a>&gt; wrote:<br><br></div><div></div><blockqu=
ote type=3D"cite"><div><div>I2C is implemented in hardware on arduino pins A=
4 and A5. A whole pile of control registers make it easy to run the protocol=
 with internal flags and interrupts. Its fairly complex The back and forth -=
ness of it, with acknowledge bits flying (or not flying) every where and cha=
nging pin MODE statesWire library mucks about in those control registers, so=
 it's not possible to run Wire on anyy other pins.&nbsp;</div><div>Your next=
 recourse software. There's plenty of I2C waveform data out there and in the=
 datasheet for the DS1307 to make it doable. The bits and bytes commands in a=
rduino make the code easy to debug.<br><br>Making the world safe for robots<=
div>-----------</div><div>Any noise in the prior signal has been inserted by=
 the iThing</div></div><div><br>On Mar 20, 2012, at 10:11 PM, Guan Yang &lt;=
<a href=3D"mailto:g...@yang.dk">g...@yang.dk</a>&gt; wrote:<br><br></div><di=
v></div><blockquote type=3D"cite"><div>
    <div id=3D"reply-content">I am pretty sure Wire uses hardware support fo=
r I2C that requires those particular pins. In theory you could implement I2C=
 like SoftwareSerial for async serial, that would run on any pin (or any pin=
 with an interrupt), but I haven't seen such an implementation.
    </div><div id=3D"reply-content"><br></div><div id=3D"reply-content">What=
's on those pins? Can you move it?</div>
    <div id=3D"813F2572B7C944B4828E61B73578A929"></div>
    =20
    <p style=3D"color: #A0A0A8;">On Tuesday, March 20, 2012 at 21:00, Adrien=
ne Humblet wrote:</p>
    <blockquote type=3D"cite" style=3D"border-left-style:solid;border-width:=
1px;margin-left:0px;padding-left:10px;">
        <div id=3D"quoted-message-content"><div><div>Hi,</div><div><br></div=
><div>I'm trying to hook up a DS1307 RTC chip to an Arduino Uno. The DS1307<=
/div><div>uses the I2C bus which requires 2 connection to the Arduino. The</=
div><div>Wire.h library (which is what the Arduino uses for I2C protocol)</d=
iv><div>expects the SDA (serial data) and SCK (serial clock) connections in<=
/div><div>the Analog 4 and Analog 5 pins of the Arduino.</div><div><br></div=
><div>Does anyone know how to make it such that the Wire library expects SDA=
</div><div>and SCK in other pins? Pins A4 and A5 are already taken up by oth=
er</div><div>non I2C devices.</div><div><br></div><div>Does anyone know what=
 I'm talking about?</div><div><br></div><div>I thought it would be easy, but=
 when I look in Wire.h I don't see any</div><div>pin assignments.</div><div>=
<br></div><div>Thanks!</div><div>-Adrienne</div><div><br></div><div>-- </div=
><div>You received this message because you are subscribed to the Google Gro=
ups "NYCResistor:Microcontrollers" group.</div><div>To post to this group, s=
end email to <a href=3D"mailto:nycresistormicrocontrollers@googlegroups.com"=
>nycresistormicrocontrollers@googlegroups.com</a>.</div><div>To unsubscribe f=
rom this group, send email to <a href=3D"mailto:nycresistormicrocontrollers+=
unsubscribe@googlegroups.com">nycresistormicrocontrollers+unsubscribe@google=
groups.com</a>.</div><div>For more options, visit this group at <a href=3D"h=
ttp://groups.google.com/group/nycresistormicrocontrollers?hl=3Den">http://gr=
oups.google.com/group/nycresistormicrocontrollers?hl=3Den</a>.</div></div></=
div>
        =20
        =20
        =20
        =20
    </blockquote>
    =20
    <div>
        <br>
    </div>

<p></p>

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esistormicrocontrollers?hl=3Den</a>.<br>


</div></blockquote>

<p></p>

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esistormicrocontrollers?hl=3Den</a>.<br>


</div></blockquote></body></html>=

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