Comments on: Binary clock http://blog.tjugotre.org/2008/04/15/binaeruhr/ \o/ Sat, 22 Nov 2008 03:00:20 +0000 http://wordpress.org/?v=2.5.1 By: Aditya http://blog.tjugotre.org/2008/04/15/binaeruhr/#comment-13837 Aditya Mon, 18 Aug 2008 06:53:01 +0000 http://blog.tjugotre.org/2008/04/15/binaeruhr/#comment-13837 Thanks a lot for all your help. I tried changing the prescaler but that did not help so I changed the timer function a bit and now it works. Thanks a lot. Thanks a lot for all your help. I tried changing the prescaler but that did not help so I changed the timer function a bit and now it works. Thanks a lot.

]]> By: Valentin http://blog.tjugotre.org/2008/04/15/binaeruhr/#comment-13836 Valentin Sun, 17 Aug 2008 16:54:16 +0000 http://blog.tjugotre.org/2008/04/15/binaeruhr/#comment-13836 Try looking at your data sheet to see what you need to set to get your prescaler to 128, then you probably won't have to change the 128 to 1024. As for the hour thing - no idea, sorry. Try looking at your data sheet to see what you need to set to get your prescaler to 128, then you probably won’t have to change the 128 to 1024. As for the hour thing - no idea, sorry.

]]> By: Aditya http://blog.tjugotre.org/2008/04/15/binaeruhr/#comment-13835 Aditya Sun, 17 Aug 2008 16:49:45 +0000 http://blog.tjugotre.org/2008/04/15/binaeruhr/#comment-13835 And it does not work. Some problem. Whenever I run the code as it is, just changing the frequency, then the clock runs very slow. And when I changed the overflow denominator to 1024, then it ran well, but the hours were changing every 20 minutes (20 minutes real time AND when the minute LEDs were 20, 40 and 60) Any ideas? I can't figure out anything. And it does not work. Some problem. Whenever I run the code as it is, just changing the frequency, then the clock runs very slow. And when I changed the overflow denominator to 1024, then it ran well, but the hours were changing every 20 minutes (20 minutes real time AND when the minute LEDs were 20, 40 and 60)

Any ideas? I can’t figure out anything.

]]> By: Aditya http://blog.tjugotre.org/2008/04/15/binaeruhr/#comment-13833 Aditya Sun, 17 Aug 2008 16:15:53 +0000 http://blog.tjugotre.org/2008/04/15/binaeruhr/#comment-13833 I am using the internal clock for now. 4MHz... I will be buying a crystal later. I changed the frequency to 4MHz and retained the rest of the code as it is. Now, I am connecting the buttons to VCC and then I will test it. Thanks... I am using the internal clock for now. 4MHz… I will be buying a crystal later. I changed the frequency to 4MHz and retained the rest of the code as it is. Now, I am connecting the buttons to VCC and then I will test it.

Thanks…

]]> By: Valentin http://blog.tjugotre.org/2008/04/15/binaeruhr/#comment-13832 Valentin Sun, 17 Aug 2008 16:11:47 +0000 http://blog.tjugotre.org/2008/04/15/binaeruhr/#comment-13832 Uh, 20 minutes in real time or when the minute LEDs are at 20 minutes? Uh, 20 minutes in real time or when the minute LEDs are at 20 minutes?

]]> By: Valentin http://blog.tjugotre.org/2008/04/15/binaeruhr/#comment-13831 Valentin Sun, 17 Aug 2008 16:11:22 +0000 http://blog.tjugotre.org/2008/04/15/binaeruhr/#comment-13831 The buttons are connected to VCC. What is your frequency? You should really only change that - if setting it to the correct frequency doesn't work, try setting it to others until the seconds are fine. The buttons are connected to VCC.
What is your frequency? You should really only change that - if setting it to the correct frequency doesn’t work, try setting it to others until the seconds are fine.

]]> By: Aditya http://blog.tjugotre.org/2008/04/15/binaeruhr/#comment-13830 Aditya Sun, 17 Aug 2008 16:04:41 +0000 http://blog.tjugotre.org/2008/04/15/binaeruhr/#comment-13830 :( You are right... making it 1024 has made the hour LEDs change their state every 20 minutes.... :( You are right… making it 1024 has made the hour LEDs change their state every 20 minutes….

]]> By: Aditya http://blog.tjugotre.org/2008/04/15/binaeruhr/#comment-13829 Aditya Sun, 17 Aug 2008 15:21:35 +0000 http://blog.tjugotre.org/2008/04/15/binaeruhr/#comment-13829 Okay... thanks. But I think something is missing here... I changed the CPU_F to 4MHz and then the overflow to CPU_F/1024/1 and the clock is working great. :-| One last thing (sorry to bother you again and again... and again) but, how do I connect the interrupt switches? PortB1 - Switch - Ground OR PortB1 - Switch - VCC? Aditya Okay… thanks. But I think something is missing here… I changed the CPU_F to 4MHz and then the overflow to CPU_F/1024/1 and the clock is working great. :-|
One last thing (sorry to bother you again and again… and again) but, how do I connect the interrupt switches? PortB1 - Switch - Ground OR PortB1 - Switch - VCC?

Aditya

]]> By: Valentin http://blog.tjugotre.org/2008/04/15/binaeruhr/#comment-13828 Valentin Sun, 17 Aug 2008 14:19:20 +0000 http://blog.tjugotre.org/2008/04/15/binaeruhr/#comment-13828 No, don't change any of the other constants - I'm calculating these through F_CPU. So if you set the overflow variable to 2*F_CPU/128 after halving F_CPU, the two changes negate each other. You do not want that ;) If the frequency of the CPU is halved, the overflow value gets reached half as fast - but by also halving F_CPU, the overflow value gets halved too, so it doesn't take any longer after all. Sorry about the crappy explanation, but I hope that you understand it anyway. Also, you can use the reply link at the bottom of a post - that way, all the replies are in one thread. No, don’t change any of the other constants - I’m calculating these through F_CPU. So if you set the overflow variable to 2*F_CPU/128 after halving F_CPU, the two changes negate each other. You do not want that ;) If the frequency of the CPU is halved, the overflow value gets reached half as fast - but by also halving F_CPU, the overflow value gets halved too, so it doesn’t take any longer after all. Sorry about the crappy explanation, but I hope that you understand it anyway.
Also, you can use the reply link at the bottom of a post - that way, all the replies are in one thread.

]]> By: Aditya http://blog.tjugotre.org/2008/04/15/binaeruhr/#comment-13827 Aditya Sun, 17 Aug 2008 13:59:27 +0000 http://blog.tjugotre.org/2008/04/15/binaeruhr/#comment-13827 So, none of the other parameters are linked with it? I mean, I saw that timer overflow is F_CPU/128/1 I thought as F_CPU is now halved, I might have to set the overflow as 2F_CPU/128/1.... I will be buying a crystal soon... So, none of the other parameters are linked with it? I mean, I saw that timer overflow is F_CPU/128/1 I thought as F_CPU is now halved, I might have to set the overflow as 2F_CPU/128/1…. I will be buying a crystal soon…

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