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Forum Index : Microcontroller and PC projects : Maximite and RTC ds1307
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BobD Guru  Joined: 07/12/2011 Location: AustraliaPosts: 935 |
You guys don't need to worry about the actual detail of the calculations. Just read the Wikipedia link I referred to back here. and it describes the theory behind the various algorithms. How they accommodate the varying years, leap years and months. Just gloss over their equations unless you are going to develop your own code from them. |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9308 |
Oh I know what you are saying, Bob, and I have read the link a couple of times, but still don't really follow it. It's as simple as wanting to understand how it works, is all. 
You're right though - it does not really matter in the larger scheme of things, so long as it works!  Smoke makes things work. When the smoke gets out, it stops! |
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| paceman Guru Joined: 07/10/2011 Location: AustraliaPosts: 1329 |
Graeme/TZ, How about adding it to the MMBasic library. There are quite a few of these great little bits of code that are so useful to many people but not that easy to find otherwise. Greg |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9308 |
TZA wrote the hard part, but I believe Bob also has a similar routine. I can't steal that and put it in the library, as I did not write it! 
If TZA is happy enough to have it entered, I am more then happy to have my bit too, but I don't want to step on anyone's toes, as I did not actually write the routine, if you see what I mean.(other then the bit with the array and calling the function to show the day of the week by name, but that is an addition to TZA's source more then anything...) How do you submit something for the library anyway? Smoke makes things work. When the smoke gets out, it stops! |
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| BobD Guru Joined: 07/12/2011 Location: AustraliaPosts: 935 |
Grogster Here is how to do it at this link http://geoffg.net/maximite.html . It's public now so why not submit it. I would be surprised if TZA would not agree. Bob MMBasic Library
The MMBasic library is a collection of programs specifically written for MMBasic. These include games like Space Invaders and Pacman, demonstration snippets of code and programs to do interesting things like generate morse code. Because the programs are so small they are all bundled together into a single downloadable file available in the download section below. The library is managed by Hugh Buckle and is a great resource for beginners and experts alike. If you have written a program for MMBasic and you believe that it is worth sharing, please send it to Hugh at mmlib@geoffg.net and he will add it in. You should also include a description of what the program does for the library index. |
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MicroBlocks Guru Joined: 12/05/2012 Location: ThailandPosts: 2209 |
Once it is in a post it is in the public domain. :) I thought about changing it a little. It now accepts year, month and day. It would probably be nicer in the MMBasic context to just have one parameter Date$. What do you think? Microblocks. Build with logic. |
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| paceman Guru Joined: 07/10/2011 Location: AustraliaPosts: 1329 |
You're a good programmer TZ, do it as you see best. Greg |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 3805 |
No it isn't. Anything anyone writes is their copyright in vast areas of the world. (USA, Europe, etc, at least.) No need to assert copyright, it is automatic. If someone wants it to be PD then they need to say so. Of course when it's a copy of something then the original retains whatever status it had and the copy may in itself be a breach of copyright. I don't know what laws Thailand has but I sure know these issues for USA and Europe. I believe Australia & NZ will be similar. John |
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| BobD Guru Joined: 07/12/2011 Location: AustraliaPosts: 935 |
Given the talk about copyright, with some of the code where does it start? The piece currently being discussed is the conversion of a date into a Day of the Week (aka DoW). Like many others I subscribe to not re-inventing the wheel if at all possible. I started fiddling with RTCs on the Maximite back in late 2011 and a guy named DuinoMiteMegaAndy was active in this forum then and he was into RTCs. He put his code out in the open so I copied it and modified it for my use. Andy's work included a bit of code to convert a date to a DoW. Here is Andy's code way back then and it was probably not original. Other forum members also did a lot of work on RTCs back in 2011. Andy's code to convert to DoW is in lines 340 to 410 with an adjustment in line 420 because some (all?) RTCs use weekday numbers from 1 to 7 rather than zero to 6 as the algorithm produces. I also found the Wikipedia article on the subject. Good enough for him and so for me and it was also very much out in public. I used Andy's code and simplified it. In particular I condensed lines 340 to 390 down to 2 lines of code and 400 to 420 into one line of code. Note the use of FIX in the code instead of INT. In MMBasic, FIX is truncation of of the number to an integer where INT is truncation with rounding. |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9308 |
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| MicroBlocks Guru Joined: 12/05/2012 Location: ThailandPosts: 2209 |
That day of week code is already pretty old, probably as old as the first microcomputer. I don't know its origin. Many used to share code without hanging copyrights to everything. The one i posted and shared back then too i have used in a old dos qbasic program from around 1991-1992. I was a member of a computer club and that was what we did. I like to rewrite code i find, like more sensible variable names, more structure if possible, that kind of things. I already said i got it from somewhere, would not be nice if i would claim copyright. INT in MMBasic gets the whole number less or equal. The difference is that FIX will just return the whole part. The difference is with negative numbers only. Adding it to the library would be fine, contributions is not the reason why i post code. I suggest to contribute it to "As found on the Backshed Forum", maybe even with a link so that future users can find this forum and read the discussion about it. Microblocks. Build with logic. |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9308 |
Right-o, I will submitt and comment the code, so that TZA is credited for the function that does all the number crunching. References to the forums and members here will also be included. Weather it is accepted, is another matter altogether.... Hope you all don't think I am being to pedantic about all this, but God knows there is enough ID theft and taking credit for someone else's ideas in the world, without me adding to it - credit where credit is due - I have ethics and morals...  Smoke makes things work. When the smoke gets out, it stops! |
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