http://forums.leaflabs.com/topic.php?id=1084 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:23:52 +0000 http://bbpress.org/?v=1.0.2 q http://forums.leaflabs.com/search.php http://forums.leaflabs.com/topic.php?id=1084#post-6829 Tue, 11 Oct 2011 17:37:16 +0000 poslathian 6829@http://forums.leaflabs.com/ <p>you might also check out the example from here:<br /> <a href="http://forums.leaflabs.com/topic.php?id=1109" rel="nofollow">http://forums.leaflabs.com/topic.php?id=1109</a> </p> http://forums.leaflabs.com/topic.php?id=1084#post-6693 Fri, 30 Sep 2011 05:04:52 +0000 mbolivar 6693@http://forums.leaflabs.com/ <p>hi eddiea6897,</p> <p>when you say you can't read/write, do you mean you get nothing/garbage data back, or that the signals aren't coming out on the pins correctly?</p> <p>the wire library is... okay, but not super reliable. we put it in as a stopgap measure while we were developing hardware i2c. crenn has a much improved version that you might want to try:</p> <p><a href="http://forums.leaflabs.com/topic.php?id=1033#post-6321" rel="nofollow">http://forums.leaflabs.com/topic.php?id=1033#post-6321</a> </p> http://forums.leaflabs.com/topic.php?id=1084#post-6688 Fri, 30 Sep 2011 01:18:58 +0000 eddiea6897 6688@http://forums.leaflabs.com/ <p>in my attempts , with my limited understanding , to use the wire library to write to an External EEPROM, no real use for it but just trying to learn ym way around the board through experiments , i cannot read and im guessing nor write to the chip<br /> datasheet : <a href="http://ww1.microchip.com/downloads/en/devicedoc/21203m.pdf" rel="nofollow">http://ww1.microchip.com/downloads/en/devicedoc/21203m.pdf</a></p> <p>using the following code which i think its pretty straight forward in terms of how the data is sent and what the chip expects.<br /> begin transmission send high adress followed by low followed by my data then end transmission. I am also assuming wire takes care of the read/write bits?</p> <pre><code>#include &lt;Wire.h&gt; int stuff = 255 ; byte high = 0x00; byte low = 0x00; void setup() { Wire.begin(9,5); SerialUSB.println(&quot;Initiating...&quot;); pinMode(2, OUTPUT); digitalWrite(2, HIGH); } void loop() { sendData(stuff); delay(5000); SerialUSB.println(readData()); } void sendData(int data) { Wire.beginTransmission(0B1010000); // can also be written in Hex: 0x50 Wire.send(high); Wire.send(low); Wire.send(data); Wire.endTransmission(); } byte readData() { Wire.beginTransmission(0B1010000); // can also be written in Hex: 0x50 Wire.send(high); Wire.send(low); Wire.endTransmission(); Wire.requestFrom(0B1010000, 1); return Wire.receive(); }</code></pre>