tag:blogger.com,1999:blog-1841690962891610467.post5348738684004762198..comments2023-10-08T06:49:51.430-04:00Comments on Arduino Blag: Timer2 and Overflow Interrupt: Let's Get CookingNoah Shttp://www.blogger.com/profile/10689635284606719903noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-1841690962891610467.post-34855296247704847662019-06-15T01:42:59.403-04:002019-06-15T01:42:59.403-04:00TIFR2 = 0x00; //Timer2 INT Flag Reg: Clear Timer O...TIFR2 = 0x00; //Timer2 INT Flag Reg: Clear Timer Overflow Flag<br /><br />I don't think you can clear the flag by writing 0 to it. You need 1s:)Romickhttps://www.blogger.com/profile/17925994661987090794noreply@blogger.comtag:blogger.com,1999:blog-1841690962891610467.post-26870614148237743172018-12-12T13:54:52.050-05:002018-12-12T13:54:52.050-05:00Great post and well explained. Great post and well explained. Anonymoushttps://www.blogger.com/profile/15761260059275075739noreply@blogger.comtag:blogger.com,1999:blog-1841690962891610467.post-25845861222401306542015-10-13T08:42:16.770-04:002015-10-13T08:42:16.770-04:00Hi, I have some questions can you help me please?Hi, I have some questions can you help me please?Anonymoushttps://www.blogger.com/profile/14909017049628792377noreply@blogger.comtag:blogger.com,1999:blog-1841690962891610467.post-73854490334895069222013-04-02T08:58:33.275-04:002013-04-02T08:58:33.275-04:00Good explaination, this is a modest example using ...Good explaination, this is a modest example using pin 13:<br />< BEGINCODE ><br />unsigned int toggle = 0; //used to keep the state of the LED<br />unsigned int count = 0; //used to keep count of how many interrupts were fired<br />byte ledpin = 13; //for testing - onboard pin<br />unsigned int blinkms = 0; //duration of blink<br /><br />ISR(TIMER2_OVF_vect) //Timer2 Overflow Interrupt Vector, called every blinkms<br />{<br /> count++; //Increments the interrupt counter<br /> if(count > (blinkms - 1))<br /> {<br /> toggle = !toggle; //toggles the LED state<br /> count = 0; //Resets the interrupt counter<br /> }<br /> digitalWrite(ledpin,toggle);<br /> TCNT2 = 130; //Reset Timer to 130 out of 255 - 130 1 sec - 192.5 0.5 sec<br /> TIFR2 = 0x00; //Timer2 INT Flag Reg: Clear Timer Overflow Flag<br />}<br /><br />void setup() <br />{<br /> Serial.begin(57600);<br /> TIMSK2 = 0x00; //Timer2 INT Reg: Timer2 Overflow Interrupt Enable<br /> TCCR2A = 0x00; //Timer2 Control Reg A: Normal port operation, Wave Gen Mode normal<br />}<br /><br />void loop() <br />{<br /> if(Serial.available())<br /> {<br /> byte c = Serial.read();<br /> if (c==65) //A<br /> {<br /> Serial.println("Blink 500 ms");<br /> blinkled(13,500);<br /> }<br /> if (c==66) //B<br /> {<br /> Serial.println("Blink 1 sec.");<br /> blinkled(13,1000);<br /> }<br /> if (c==67) //C<br /> {<br /> Serial.println("Disabled");<br /> TIMSK2 = 0x00; //Timer2 INT Reg: Timer2 Overflow Interrupt Disable<br /> digitalWrite(ledpin,LOW);<br /> }<br /> if (c==68) //D<br /> {<br /> Serial.println("Enabled");<br /> TIMSK2 = 0x00;<br /> digitalWrite(ledpin,HIGH);<br /> }<br /> if (c==69) //E<br /> {<br /> for (unsigned int i = 0; i<1000; i++) Serial.println("TESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTESTTEST");<br /> }<br /> }<br />}<br /><br />void blinkled(byte setpin,unsigned int microseconds)<br />{<br /> pinMode(ledpin,OUTPUT);<br /> ledpin = setpin;<br /> blinkms = microseconds;<br /> TIMSK2 = 0x01; //Timer2 INT Reg: Timer2 Overflow Interrupt Enable<br />}<br /><br />To blink use the command: blinkled(pin,duration);<br /><br />I would like to test 16bit timers...<br /><br />p.s.: the captcha doesn't works in google chrome, works in IEAnonymoushttps://www.blogger.com/profile/09151002729716283792noreply@blogger.comtag:blogger.com,1999:blog-1841690962891610467.post-92066575332959860262012-02-21T07:21:12.079-05:002012-02-21T07:21:12.079-05:00thank's!! ^^thank's!! ^^Fadia Dewandahttps://www.blogger.com/profile/09280807251947574072noreply@blogger.comtag:blogger.com,1999:blog-1841690962891610467.post-79231965205886316822012-02-02T08:24:11.097-05:002012-02-02T08:24:11.097-05:00Hi Noah,
it seems you truly master the management...Hi Noah,<br /><br />it seems you truly master the management of timers. I realized two projects that work great independently but I can not run simultaneously and I guess it is due to a timer conflict. Unfortunately I'm really lost with it. If you have time maybe you can have a look ? The libraries that seem to be in conflicts are <a href="http://www.open.com.au/mikem/arduino/VirtualWire-1.9.zip" rel="nofollow">VirtualWire.h</a> and <a href="http://nootropicdesign.com/digitshield/downloads/DigitShieldLibrary.zip" rel="nofollow">DigitShield.h</a>. The code <a href="http://www.infopollens.com/TimersConflicts/" rel="nofollow"> here </a> is compiling without error but nothing works. Hope you can help...vincehttps://www.blogger.com/profile/08744281465130758938noreply@blogger.com