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03/29/09 01:46
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#163948 - Can't see "not helped"
Responding to: ???'s previous message
1) Since the new layout, I normally use the flat form since in tree view, the markings of new or updated posts do not work. The only markup that does work in tree view is the "Newest" symbol.

2) If you look in three view, all these posts are direct descendants of a post by from me made less than 24 hours, so I can't see that I'm jumping around by writing posts in this tree branch.

3) The forum has a nice feature called "Preview Before Posting". When I did write my first answer down the tree branch after Andys post, you did not have any "Andy" quote in your text. As a matter of fact, you are constantly modifying your posts way after originally posting them, so it is quite hard to correlate the contents of your posts with any answers.

4) If I did respond to an answer directly aimed to Andy, then I must ask: Did you mean that Andy has been making fun of the OP? Did you mean that Andy only helped expecting that the OP should bow? Your post did not look like a post where the arguments where aimed specifically at Andy. And since you didn't even had a quote by Andy, I am quite surprised (or actually not) about that comment.

5) When it comes to "not helping him", this is a cornerstone of your arguments, that you are using when responding to just about everyone. But you fail to convince that we are not helping.

Your first example how he wasn't helped because he didn't understood was his second post in this thread:
http://www.8052.com/forum/read/160842
It would have been a valid argument, if we had left there. But since both you and I know that he did receive more information, that link is misrepresentation of facts. Just as misrepresenting as if I should use this link to convince people that he did understand the circular buffer solution:
http://www.8052.com/forum/read/160846

Then you follow up with the second link:
http://www.8052.com/forum/read/162729
On one hand, it is feedback admitting that he didn't get the concept of a circular buffer. But wait a minute. We didn't left him hanging there. What your link does not show is that he got more information about a circular buffer.

The referenced post also contains a question about the diodes getting dim when more text is displayed. On one hand, the schematics the OP did post after a while did indicate that the series resistors was on the wrong side of the diodes, resulting in the diode intensity being affected by the number of concurrently lit diodes in the same scanline. That was help. There was also a discussion about how to emit data very quickly, to keep up the refresh rate. Both in this thread and in another thread. That was help. But as this thread currently stands, the OP has probably either killed his diodes, or not managed to correctly move the resistors to the correct location. We don't know, since there have not been any more feedback. The OP has not received further help because there is nothing to help with until we get a new post telling the current state of affairs. Don't blame the helpers for standing by, waiting.

Your third link shows that the OP was tired of CRT discussions. I can understand that. So was I. But it isn't a proof, or even indication, that the OP was not being helped. Just that there was a bit much noise in the thread, and that there was one or more problems he was stuck with. However, some of that noise was probably useful to other forum members.
http://www.8052.com/forum/read/162795
At this time, we did not have enough information to help with the dimming of the diodes, if they where caused by drive current. And we did not know if he was activelly looking at some of the output code he did receive in another thread. So it wasn't so easy to magically help him getting "unstuck".

Your fourth link was
http://www.8052.com/forum/read/163134
See - here we did get information to catch problems with the row drive, 9 days after the note that the diodes got dim when more characters was displayed. Bad us to not be helpful and respond earlier! A very good example how we was not helpful during these 9 days. At this point, I was of the opinion that it would be better to have the hardware validated as working and a base software capable to emit a static bitmap correctly before returning back to the circular buffer. If you have one shift register for each scanline, then you can do the scrolling at a very slow pace by just emitting a single new column for each scroll step. But with a multiplexed display, you are reusing the same shift register for multiple scanlines. This means that a scroll buffer can only give advantages with the building of a bitmap in memory - not with the actual output of the bitmap. In short, experimenting (hey, didin't you suggest that experimenting and making mistakes are important steps in learning?) with the emit of row-based and column based data was suggested. He was given sample code for both alternatives. And to make it every easier, I did suggest that he completely skipped the bitmap and just test the hardware by pre-filling the shift register with static data. Your link above do not show any indications if he did get such help or not, or if he did look at it or if he tried anything. If a student during a lesson says that he needs help understanding something - is that then proof that he/she isn't getting any help? Don't you think you have to look forward in time to find out if the student do get help, instead of snapshoting the question?

Your fifth and final link was:
http://www.8052.com/forum/read/163253
To quote it fully:
Aamir said:
Sorry guys, for my silence to the topic. It is due to weekend. I only use internet in my college in working days. so sorry for that.
First i am going to cange resistors' positions as you people have said then i'll tell you the results.
Thanks Sir KAI for my support and others. I dont mind your ctiticism but try to learn something from that. It is new i am new to this Micro controller.
Thanks Again

No, I can't see this as proof that Aamir did not get help. He has an open action point to fix the hardware, so he has a valid platform to test his code on. We can't help him with that action point, since hardware is involved. To help would require that we either had the postal address so we could send complete hardware, or take a plane and come and modify the hardware for him. How unhelpful we are for not selecting one of these options.

His final post might have sounded differently if he had received a turnkey solution. But then you have to consider this: Is it the responsibility of a forum to supply turnkey solutions? Are people not being helped if they don't get turnkey solutions but instead gets help getting over the obstacle they are currently stuck at? And would he have been able to run this turnkey solution on his hardware - the hardware with the killer resistors?

List of 307 messages in thread
TopicAuthorDate
Scrolling Message in LED Display with 8051??            01/01/70 00:00      
   2 separate problems            01/01/70 00:00      
   the simple way            01/01/70 00:00      
      didnot get you            01/01/70 00:00      
         Standard circular buffer            01/01/70 00:00      
            Thanks            01/01/70 00:00      
               Flickering in scrolling            01/01/70 00:00      
                  Clip to viewport            01/01/70 00:00      
                     Testing on 8x8 display.            01/01/70 00:00      
                        Write fastest loop and count instructions            01/01/70 00:00      
                           Any other suggestions            01/01/70 00:00      
                              yes and no            01/01/70 00:00      
                                 Frankly speaking            01/01/70 00:00      
                                    time, time, time            01/01/70 00:00      
                              You should investigate old-style monochrome video adapters            01/01/70 00:00      
                                 but pretty close            01/01/70 00:00      
                                    not wishing to start a debate ...            01/01/70 00:00      
                                       pixel rate            01/01/70 00:00      
                                          Yes, that's true, but it's irrelevant            01/01/70 00:00      
                                             Persistence matters, and algorithm            01/01/70 00:00      
                                                I believe there's a difference in approach here            01/01/70 00:00      
                                                   Shift registers to drive rows, not columns.            01/01/70 00:00      
                                                      ...which is why they don'tfit this sort of application            01/01/70 00:00      
                                                         Think about pulse quota when multiplexing            01/01/70 00:00      
                                                            Yes, the multiplexing affects ultimate brightness ...            01/01/70 00:00      
                                                               never heard of 2 lines???            01/01/70 00:00      
                                                                  Yes, but most people can only read one at a time            01/01/70 00:00      
                                                                     16 pix            01/01/70 00:00      
                                                                        It's news to me ...            01/01/70 00:00      
                                                                           Good with forums            01/01/70 00:00      
                                                      Do you mean a REGISTERED shift register?            01/01/70 00:00      
                                                         Yes            01/01/70 00:00      
                                                            Absolutely!            01/01/70 00:00      
                                                         never seen one            01/01/70 00:00      
                                                      That's the answer i was looking for...            01/01/70 00:00      
                                       one can change the colour on an LED            01/01/70 00:00      
                                       a monochrome display has one LED per pixel            01/01/70 00:00      
                                          It is seldom so simple as one would like            01/01/70 00:00      
                                             I too read 8x8 as pixels/LEDs. However, probelm with scroll            01/01/70 00:00      
                                                Please leave that CRT            01/01/70 00:00      
                                                   But we area focused            01/01/70 00:00      
                                                   Chequebook time!            01/01/70 00:00      
                                                   You haven't told us anything useable!            01/01/70 00:00      
                                                      The Information            01/01/70 00:00      
                                                      The Information            01/01/70 00:00      
                                                         Mr. amir            01/01/70 00:00      
                                                      The Information            01/01/70 00:00      
                                                      The Information            01/01/70 00:00      
                                                      The Information            01/01/70 00:00      
                                                         Quoting Andy on this            01/01/70 00:00      
                                                            re the rating of "Quoting Andy on this"            01/01/70 00:00      
                                                               LOL            01/01/70 00:00      
                                                                  It was me, Per...            01/01/70 00:00      
                                                                     Feedback            01/01/70 00:00      
                                                                        I agree with you in all points, but...            01/01/70 00:00      
                                                                           I agree, Kai --- in most cases ...            01/01/70 00:00      
                                                                              Kick-starting threads do require some form of pushing            01/01/70 00:00      
                                                         That will be UGLY            01/01/70 00:00      
                                                            Not necessarily...            01/01/70 00:00      
                                                         That is not ALL the information.            01/01/70 00:00      
            Looked at circular buffer yet?            01/01/70 00:00      
   Has anyone looked at Allegro?            01/01/70 00:00      
      A specific chip for the shift-register solution            01/01/70 00:00      
         Think about total power loss            01/01/70 00:00      
            you tell me            01/01/70 00:00      
      the A6833 and similar offerings            01/01/70 00:00      
   Code, problem, information and schematic.            01/01/70 00:00      
      BU4094 is fast enough, but...            01/01/70 00:00      
         look at 74HC595            01/01/70 00:00      
            Yes, and not to forget the 74HC4094...            01/01/70 00:00      
               and 80 resistors            01/01/70 00:00      
                  Mickey Mousing?? Availibility!            01/01/70 00:00      
                     my absolute impression ...            01/01/70 00:00      
                        Almost total silence            01/01/70 00:00      
                           ??            01/01/70 00:00      
                              How to activate Aamir?            01/01/70 00:00      
                                 I don't want to activate Aamir!            01/01/70 00:00      
                                    Yes, most comments here are free-running without the OP            01/01/70 00:00      
                                       Maybe the wrong sorts of questions were asked            01/01/70 00:00      
                        Let's see what the O/P wants to do            01/01/70 00:00      
                           with the amount of effort the OP shows ....            01/01/70 00:00      
                              What you have failed to consider ...            01/01/70 00:00      
                                 did you read            01/01/70 00:00      
                                    Yes, I did!            01/01/70 00:00      
                        And my absolute impression is...            01/01/70 00:00      
                           why should I do that?            01/01/70 00:00      
                              I have to agree            01/01/70 00:00      
                  What does it cost? How many would be needed?            01/01/70 00:00      
                     Exactly!            01/01/70 00:00      
                     ST2221 EQUIVALENT            01/01/70 00:00      
                        It's not widely available in the developing world            01/01/70 00:00      
                           Max power loss at high ambient temperatures            01/01/70 00:00      
                              Interesting point ... but ...            01/01/70 00:00      
                                 8- or 16-bit drivers for different applications            01/01/70 00:00      
                           because            01/01/70 00:00      
                              Is this a chicken and egg sort of question?            01/01/70 00:00      
                                 Different chips for different problems            01/01/70 00:00      
                                 no, applea and oranges            01/01/70 00:00      
                                    Isn't that a design parameter?            01/01/70 00:00      
                                       Physics and practical realities            01/01/70 00:00      
                                          In some cases, perhaps LED's are not the right technology            01/01/70 00:00      
                                       and what does all that to do with ....            01/01/70 00:00      
                                          They have to remain within specified limits.            01/01/70 00:00      
                                             Still missing muxed concept            01/01/70 00:00      
                                                No ... I'm not missing the concept ...            01/01/70 00:00      
                                                   yes you are            01/01/70 00:00      
                                                      You're thinking too narrowly, methinks.            01/01/70 00:00      
                                                         no, you are muddling            01/01/70 00:00      
                                                            It's just another way to manage a big sign            01/01/70 00:00      
                                                               not so, back at ya            01/01/70 00:00      
                                                                  PWM or shorter on times.            01/01/70 00:00      
                                                                  There's more than one way to skin a cat            01/01/70 00:00      
                                                                     Start producing signs.            01/01/70 00:00      
                                                                        Those arguments are weak!            01/01/70 00:00      
                                                                           not for those that have an inkling of understanding            01/01/70 00:00      
                                                                              So ... how fast can you clock 'em?            01/01/70 00:00      
                                                                                 if you had read and not muddled....            01/01/70 00:00      
                                                                                    Not Bad ! That IS a lot more reasonable!            01/01/70 00:00      
                                                                                       why on earth would you want to do that            01/01/70 00:00      
                                                                                          If a little bit is good, sometimes more is better ...            01/01/70 00:00      
                                                                                             you might, I wouldn't            01/01/70 00:00      
                                                                                                I can envision such a thing ... but I don't build signs            01/01/70 00:00      
                                                                                                   I feel the need to SHOUT            01/01/70 00:00      
                                                                                                      Time to get back to scrolling            01/01/70 00:00      
                                                                                                         as long as the CC drives one pixel            01/01/70 00:00      
                                                                                                            Don't everyone love a DC-driven sign?            01/01/70 00:00      
                                                                                                               In the interest of discussion ...            01/01/70 00:00      
                                                                                                                  get your head out of your ....            01/01/70 00:00      
                                                                                                                     consider ALL the alternatives ...            01/01/70 00:00      
                                                                                                                        Inkling?            01/01/70 00:00      
                                                                                                                           It comes down to why this is being discussed            01/01/70 00:00      
                                                                                                                              Where is the progress?            01/01/70 00:00      
                                                                                                                                 Robert Erlacher ??            01/01/70 00:00      
                                                                                                                                    Oops            01/01/70 00:00      
                                                                                                                                 Let's leave irrelevant issues out ... for now            01/01/70 00:00      
                                                                                                                                    Quote examples            01/01/70 00:00      
                                                                                                                                       No citation needed!            01/01/70 00:00      
                                                                                                            ... about that schematic ...            01/01/70 00:00      
                                                                                                               Still thinking single diode            01/01/70 00:00      
                                                                                                                  It doesn't HAVE to be done in a conventional granularity            01/01/70 00:00      
                                                                                                               I do not think so            01/01/70 00:00      
                                                                        One other thing ...            01/01/70 00:00      
                                                                     THAT IS what PWM does            01/01/70 00:00      
                                                                        For that, you don't need dedicated hardware            01/01/70 00:00      
                                                                           never said so            01/01/70 00:00      
                                                                              Give the customer value while making money            01/01/70 00:00      
                                                                                 A lot of intersting issues have been forced to the surface            01/01/70 00:00      
                                                                                    Go for KISS            01/01/70 00:00      
                                             fruit salad            01/01/70 00:00      
                                                Not exactly ... I think you're ignoring the point            01/01/70 00:00      
                                                   this is where you are confoosed            01/01/70 00:00      
                                                      There's nothing confusing about the procedure            01/01/70 00:00      
                                                         NO, NO, NO            01/01/70 00:00      
                                                            Yes, non-mpx is probably easier ...            01/01/70 00:00      
                                                         Resistor on varying-current side? Hot, hot, hot            01/01/70 00:00      
                                                   Please forget CRT            01/01/70 00:00      
      why this complex, why so enamored by darlingtons?            01/01/70 00:00      
         Of course, your Allegro thingis would perfectly fit...            01/01/70 00:00      
            not the transistors, the ULN in the columns            01/01/70 00:00      
      Back to square one. First experiment with fast output            01/01/70 00:00      
      Power is not Sufficient            01/01/70 00:00      
         Semi-correct            01/01/70 00:00      
      Sorry guys            01/01/70 00:00      
   Switch statement            01/01/70 00:00      
      ULN2803 ????            01/01/70 00:00      
         WHY?????            01/01/70 00:00      
         The 2803's OK ... with a current source Anode driver            01/01/70 00:00      
            Yes, unless high cathode currents...            01/01/70 00:00      
               If he's sinking current from, at most, 16 cathodes ...            01/01/70 00:00      
                  Not 16 at a time. 0 or 1 for column. 0..80 for row            01/01/70 00:00      
                     I got it from the O/P's first post            01/01/70 00:00      
                        But you don't do 80:1            01/01/70 00:00      
                           I couldn't have said it better myself!            01/01/70 00:00      
                     Code hang-ups...            01/01/70 00:00      
                        Watchdog is nice            01/01/70 00:00      
                        not a 'bright' idea            01/01/70 00:00      
                           Yes, muxed displays requires high currents to not be dim            01/01/70 00:00      
            which varies by a factor of 1:80            01/01/70 00:00      
               It's not dirt-simple, but it's not rocket-science, either            01/01/70 00:00      
                  first/second????            01/01/70 00:00      
                  evidently it is            01/01/70 00:00      
                     I just came to think of this quiz            01/01/70 00:00      
   Happy three months            01/01/70 00:00      
      It didnot work for me again.....            01/01/70 00:00      
         are you familiar with Ohms law            01/01/70 00:00      
         Write test-code for driving the diodes            01/01/70 00:00      
         I'm afraid to tell you,...            01/01/70 00:00      
            Don't shift so much            01/01/70 00:00      
               Yes, he must shift byte-wise...            01/01/70 00:00      
                  The alternative...            01/01/70 00:00      
                     Try this, Aamir...            01/01/70 00:00      
                        Thanks Sir.......            01/01/70 00:00      
                        I knew someone would do his work for him!            01/01/70 00:00      
                           Yes, and it was fun!            01/01/70 00:00      
                              Yes, of course ... but they were far too complex            01/01/70 00:00      
                                 I'm really sorry that they were "far too complex"...            01/01/70 00:00      
                                    one step at a time            01/01/70 00:00      
                                       All many of these guys want is someone to do their work            01/01/70 00:00      
                                       Big-bang            01/01/70 00:00      
                                          Lessons learned            01/01/70 00:00      
                                             Lessons...            01/01/70 00:00      
                                                the difference            01/01/70 00:00      
                                                   He learns and learns and learns...            01/01/70 00:00      
                                                      that would be true            01/01/70 00:00      
                                                         That's the point...            01/01/70 00:00      
                                                            show me one            01/01/70 00:00      
                                                      Only feedback tells where the correct level is            01/01/70 00:00      
                                                Knowledge is still the morst valuable gift            01/01/70 00:00      
                                                   You really never had a look at something bigger??            01/01/70 00:00      
                                                      Read what I write, not what you want me to write            01/01/70 00:00      
                                                         Sorry, Per, but...            01/01/70 00:00      
                                                            Atleast give OP some time            01/01/70 00:00      
                                                               male cow manure            01/01/70 00:00      
                                                               This guy is a STUDENT! And probably a lazy one.            01/01/70 00:00      
                                                                  Poor...            01/01/70 00:00      
                                                                     It should be a career-ender            01/01/70 00:00      
                                                               Ignorance is bliss?            01/01/70 00:00      
                                                                  Is this a Social Work forum?            01/01/70 00:00      
                                                                     Is this a Social Work forum? - no            01/01/70 00:00      
                                                                        ethical behaviour            01/01/70 00:00      
                                                                           Good elbows...            01/01/70 00:00      
                                                                              Some people are just lazy, and think they're entitled.            01/01/70 00:00      
                                                                              Robots has no feelings            01/01/70 00:00      
                                                                     Where do you put the limit?            01/01/70 00:00      
                                                                        Its not the point            01/01/70 00:00      
                                                                           Prove your point!            01/01/70 00:00      
                                                                              point of disagreement ?            01/01/70 00:00      
                                                                                 Teflon-avoidance of arguments            01/01/70 00:00      
                                                                                    back to the old one            01/01/70 00:00      
                                                                                 There must be a willingness to do the work!            01/01/70 00:00      
                                                                                    a nasty thought            01/01/70 00:00      
                                          by silence the OP has admitted            01/01/70 00:00      
                                             He has admitted??            01/01/70 00:00      
                                                it is a known fact that            01/01/70 00:00      
                                                   Do you think, that I aggree if I don't reply...            01/01/70 00:00      
                                                      yes, IF            01/01/70 00:00      
                                                It may not have been in this thread            01/01/70 00:00      
                                                   Plain bogus...            01/01/70 00:00      
                                                   School projects always problematic            01/01/70 00:00      
                                                      This is a recurring theme            01/01/70 00:00      
                                                         Regular on Keil too            01/01/70 00:00      
                                    Well, too many components            01/01/70 00:00      
                                    I was looking for a product I could buy, not a work-product.            01/01/70 00:00      
      And still stuck on the basics            01/01/70 00:00      
   This one's not too costly!            01/01/70 00:00      
      Nice one            01/01/70 00:00      
   facts            01/01/70 00:00      
   Silence talks...            01/01/70 00:00      
      It's because the due-date of his assignment has passed            01/01/70 00:00      
         No the OP, but the two drive-by-shooters            01/01/70 00:00      
            For Per Westermark            01/01/70 00:00      
            "Drive-by-shooters"? Are you cuckoo??            01/01/70 00:00      
               I think that was the basic problem            01/01/70 00:00      
                  Yes, and as we do not know the state of knowledge...            01/01/70 00:00      
                     Once more you focus on bowing and other nonsense            01/01/70 00:00      
                        Do you feel better now??            01/01/70 00:00      
                           Why?            01/01/70 00:00      
                              Answers...            01/01/70 00:00      
                                 Try looking from the other direction            01/01/70 00:00      
                                    Forum rules...            01/01/70 00:00      
                                       Constant misunderstandings, or kicking in open doors            01/01/70 00:00      
                                          bow? no, but questions should be answered.            01/01/70 00:00      
                     but we do            01/01/70 00:00      
                        Making mistakes and confusing things...            01/01/70 00:00      
                           Missing help?            01/01/70 00:00      
                              Why do you all the time interfere in...            01/01/70 00:00      
                                 When we ask an O/P a question ...            01/01/70 00:00      
                                    But that's it, Richard!            01/01/70 00:00      
                                       You're right, Kai, but not in the way that you might think            01/01/70 00:00      
                                 Can't see "not helped"            01/01/70 00:00      
                                    I'm tired, Per...            01/01/70 00:00      
                                       Weapons down Kai :)            01/01/70 00:00      
                                       we all are            01/01/70 00:00      
                                          we all are -            01/01/70 00:00      
                                             So enumerate the factual errors then            01/01/70 00:00      
                                                You were wrong            01/01/70 00:00      
                                                   I wish that someday ...            01/01/70 00:00      
                                                      I wish that someday ... Is that so            01/01/70 00:00      
                                                         And your argument was?            01/01/70 00:00      
                                                            Example            01/01/70 00:00      
                                                               Just curious            01/01/70 00:00      
                                                                  No reverse way just wanted to show            01/01/70 00:00      
                                                                     assisted != having others to do the job            01/01/70 00:00      
                                                                        From this at least it dosent make            01/01/70 00:00      
                                                                           Come on, now, Ap Charles ...            01/01/70 00:00      
                                                                              Have you read what Aamir wrote?            01/01/70 00:00      
                                                                                 Yes, it looks like part of the assignment spec            01/01/70 00:00      
                                                                                    Assignment specs? Hardly...            01/01/70 00:00      
                                                                                       I guess we see different things in the quoted post            01/01/70 00:00      
                                                                                          These are good arguments...            01/01/70 00:00      
                                                                                             We'll never know for certain            01/01/70 00:00      
                                                                                       switch not the big problem            01/01/70 00:00      
                                                                                          Direct and Indirect calls            01/01/70 00:00      
                                                                                             Size of feet?            01/01/70 00:00      
                                                                                                I can see your point            01/01/70 00:00      
                                                                                                   Probably yet another language problem            01/01/70 00:00      
                                                                                                      The O/P has a part to play, as do we of 8052.COM            01/01/70 00:00      
                                                                                                      Yes            01/01/70 00:00      
                                                                                          Oh dear, Per, please...            01/01/70 00:00      
                                                                                             In the eye of the beholder            01/01/70 00:00      
                                                                                                Sorry, I didn't want to hurt you!            01/01/70 00:00      
                                                                                 again, it is obvious            01/01/70 00:00      
                                                            Not big-bang solution, but snippet of code!            01/01/70 00:00      
                                                I'm not the only one who confuses things...            01/01/70 00:00      
                                                   Yes, language barrier            01/01/70 00:00      
                                                   Yes, it's true ...            01/01/70 00:00      
                           wrong question            01/01/70 00:00      

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