Parallel LCD

Comments

• Harley Posts: 997

  2006-07-24 20:39 edited 2006-07-24 20:39

  Sawmiller said...
  heres a object i made this morning for a generic 4 x 20 PARALLEL LCD
  
  using 4 bit mode ( that was hard ) hope i didnt kludge it too bad
  oh, and it is one of the older models, runs line1, line 3 , line 2 , line 4.... so i had to do some work there
  but hey, for $6 (shipping inc) what can ya expect ....
  dan
  

  
  I was watching to see if anyone would get to LCD i/f'ing before I could. I've downloaded your code to study it. Thanks Dan.
  
  Yes, I think most of the 4xN LCDs have screwy addresing. I ran into that fact years ago when getting into PICs. And the 4-bit mode saves valuable 4 I/Os at a wee bit of extra time to complete filling of a screen. I just got a 4 x 40 LCD I plan to i/f to PropSTICK. (You got a real good price on yours)
  
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  h.a.s. designn
• Sawmiller Posts: 276

  2006-07-24 22:02 edited 2006-07-24 22:02

  this is the way i got nibbles out of bytes....
  
  is there a easier way ?
  
  pri Send_Inst | temp1··········· ' can we use byte move, then shift· 4 times ?
  
  ··· temp1 := Inst
  ··· temp1 := temp1>>4
  ···
  · outa[noparse][[/noparse]RS] := 0······························· ' Set Instruction Mode
  
  
  · outa[noparse][[/noparse]15..12] := temp1······················ ' Send High Nibble
  · bs2.PULSOUT(E,3)
  · Wait_Busy
  · outa[noparse][[/noparse]15..12] := Inst······················· ' Send Low Nibble
  · bs2.PULSOUT(E,3)
  · Wait_Busy
  · outa[noparse][[/noparse]RS] := 1······························ ' Set LCD Back To Text Mode
• SSteve Posts: 808

  2006-07-25 02:39 edited 2006-07-25 02:39

  You could eliminate temp1 and change the "Send High Nibble" command to

  outa[noparse][[/noparse]15..12] := Inst >> 4
  

  
  
  Also, "outa[noparse][[/noparse]RS] := 0" can be changed to "outa[noparse][[/noparse]RS]~" and "outa[noparse][[/noparse]RS] := 1" to "outa[noparse][[/noparse]RS]~~". Probably not a significant saving of clock cycles, but it seems to be more in keeping with Spin style.
  
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• Drew_Ehrlich Posts: 1

  2006-08-09 04:31 edited 2006-08-09 04:31

  I am not a fan of hijacking threads but I'm trying to learn more on this subject. To be brief I wan to run a full color CSTN or other LCD. I gather that I need a Propellor chip, the object for the Hitatchi controller/driver, and the monitor. Is that essentially correct?