Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
02/13/05 11:15
Read: times


 		 #87255 - Hardware scroll
Responding to: ???'s previous message
In video controllers (CRT) it is (was) a common concept to set a "startpoint" - the first address in videoRAM to be displayed. This facilitates "hardware" scrolling - in one frame time you need only to update this register in the controller and the newly "appearing" column or row.
However, if your controller has no such function, you are left with techniques detailed by Michael.
I have seen the latter one on monitors in a local hospital here (a really old one, using a small TV CRT for display - we are not a very rich country), but I don't think the reason is better readibility; rather a simpler design I suspect.
Maybe Mahmood might go to a local hospital and ask the "end user" - the doctors and nurses - for their opinion?

Jan Waclawek

List of 42 messages in thread
TopicAuthorDate
GLCD Project (low frequency scope)            01/01/70 00:00      
   GLCD Scrolling            01/01/70 00:00      
      Lesson learned            01/01/70 00:00      
         did you check            01/01/70 00:00      
   hi Speed GLCD displays?            01/01/70 00:00      
      Probably            01/01/70 00:00      
      Hardware scroll            01/01/70 00:00      
         PaceSetter            01/01/70 00:00      
      Best Display >> None is perfect            01/01/70 00:00      
         Sweep mode            01/01/70 00:00      
            Scope Squares            01/01/70 00:00      
            8 Bits Update            01/01/70 00:00      
               like rotate it 90°?            01/01/70 00:00      
                  90° Rotation Indeed            01/01/70 00:00      
   One step further            01/01/70 00:00      
      Animation            01/01/70 00:00      
         scan too slow!!            01/01/70 00:00      
            15 seconds? !!!            01/01/70 00:00      
               or....            01/01/70 00:00      
               slightly more            01/01/70 00:00      
               Optimization            01/01/70 00:00      
                  calculation            01/01/70 00:00      
                     Will have a look            01/01/70 00:00      
                        assembler speedup            01/01/70 00:00      
                  if it is really slow            01/01/70 00:00      
                     too smart Man            01/01/70 00:00      
                        another way            01/01/70 00:00      
                  When do you wait?            01/01/70 00:00      
                     first choice            01/01/70 00:00      
               should I use Serial RAM for buffer?            01/01/70 00:00      
                  serial RAM and time            01/01/70 00:00      
                     lcd_not_busy();            01/01/70 00:00      
                        a much faster approach            01/01/70 00:00      
                           I don't have enough XRAM            01/01/70 00:00      
                              magic            01/01/70 00:00      
                              more tweaking            01/01/70 00:00      
                                 Good thinking Jan            01/01/70 00:00      
                                    tweaking II.            01/01/70 00:00      
                                       Magic Tweeking            01/01/70 00:00      
                  Serial RAM is useless            01/01/70 00:00      
   maybe this technique will work here            01/01/70 00:00      
      Multi-microcontrollers            01/01/70 00:00      

Back to Subject List