http://forums.leaflabs.com/topic.php?id=593 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:15:17 +0000 http://bbpress.org/?v=1.0.2 q http://forums.leaflabs.com/search.php http://forums.leaflabs.com/topic.php?id=593#post-3324 Fri, 07 Jan 2011 15:56:17 +0000 mikep 3324@http://forums.leaflabs.com/ <p>Ok, thank you, I see that sentence now.<br /> So the documentation above seems to just be a little bit out of date where it says: </p> <pre><code>Parameters * channel - the channel to attach the ISR to, from 1 to 4. * handler - The ISR to attach to the given channel.</code></pre> <p>It's nice that libmaple does all the translation from PIN to the ISR for us.<br /> Thanks again,<br /> Mike </p> http://forums.leaflabs.com/topic.php?id=593#post-3322 Fri, 07 Jan 2011 15:10:09 +0000 General Tree 3322@http://forums.leaflabs.com/ <p>"On the Maple, you don’t have to remember which interrupt number goes with which pin – just tell attachInterrupt() the pin you want." (quote from <a href="http://leaflabs.com/docs/lang/api/attachinterrupt.html#id3" rel="nofollow">http://leaflabs.com/docs/lang/api/attachinterrupt.html#id3</a> )</p> <p>This means that if you want to attach an interrupt to pin #2, you need to write</p> <p>attachInterrupt(2,handler,CHANGE);</p> <p>regardless of the EXTIx channel the pin is connected to (for this pin, its EXTI0).<br /> However, it means that once you attached an interrupt to pin #2, you can not attach an external interrupt to pins 15 and 27, since they too share the EXTI0 channel.</p> <p>As for the example, what it does is it reads the state on pin #0 and turns on/off the led on pin #13 accordingly. It would be pointless to attach the interrupt to pin #13, and then change pin #13 according to itself.<br /> I hope that cleared things a bit. </p> http://forums.leaflabs.com/topic.php?id=593#post-3318 Fri, 07 Jan 2011 12:22:54 +0000 mikep 3318@http://forums.leaflabs.com/ <p>I am not clear on why the call to attachInterrupt needs to be changed from "0" to "analogInPin"?<br /> I was looking at the documentation for "attachInterrupt" <a href="http://leaflabs.com/docs/lang/api/attachinterrupt.html" rel="nofollow">http://leaflabs.com/docs/lang/api/attachinterrupt.html</a> and it seems a bit confusing to me.<br /> First, the documentation of the method signature only lists 2 parameters, not three.<br /> Also, it talks about valid values from 0 to 4 for the first parameter (channel).<br /> How does one know which "channel" belongs to which Pin?<br /> Or is a channel the same as an EXTI line, and we can use this document here to determine which channel to use with which pin:<br /> <a href="http://leaflabs.com/docs/external-interrupts.html#external-interrupts" rel="nofollow">http://leaflabs.com/docs/external-interrupts.html#external-interrupts</a></p> <p>So that document says that Pin2 would actually be EXTI0 (channel 0)?<br /> The example uses channel 0 for Pin13, so that is different too.</p> <p>Or is the attachInterrupt method actually translating the pin number into the appropriate channel etc or am I completely looking at this the wrong way?</p> <p>Thanks for any insights... </p> http://forums.leaflabs.com/topic.php?id=593#post-3294 Tue, 04 Jan 2011 19:39:32 +0000 perry 3294@http://forums.leaflabs.com/ <p>hi,</p> <p>change attachInterrupt (0, handler, RISING) to:</p> <p>attachInterrupt (analogInPin, handler, RISING); </p> http://forums.leaflabs.com/topic.php?id=593#post-3280 Sun, 02 Jan 2011 17:35:16 +0000 doctorzaius 3280@http://forums.leaflabs.com/ <p>I think the external interrupts on my maple aren't working and this is why: </p> <p>1) I connected pin 2 and pin 9.</p> <p>2) I wrote a program that installs an interrupts handler for pin 2 and generates a square wave using pin 9.</p> <p>3) when the program runs, the interrupt handler never gets invoked. The same program works on my Arduino UNO. Here it is:</p> <p>/*<br /> * Interrupt test<br /> */</p> <p>const int analogOutPin = 9; //Pin 9 and Pin 2 are wired together.<br /> const int analogInPin = 2;</p> <p>volatile int count = 0;</p> <p>void setup()<br /> {<br /> pinMode (analogOutPin, OUTPUT);<br /> pinMode (analogInPin, INPUT);<br /> attachInterrupt (0, handler, RISING);<br /> }</p> <p>void handler ()<br /> {<br /> count++;<br /> }</p> <p>void loop() {<br /> digitalWrite (analogOutPin, HIGH);<br /> delay (50);<br /> digitalWrite (analogOutPin, LOW);<br /> delay (50);<br /> SerialUSB.print (count);<br /> SerialUSB.print ("\n");<br /> }</p> <p>What am I doing wrong? </p>