Re: [Owfs-developers] DS2408 LCD - can't get it to work

Sun, 19 Nov 2006 15:59:28 -0800

I seem to be having similar troubles too.  I'm using a hobby-boards driver on a 4x40 LC4857FG-SNYLV  (which is essentially two 2x40 LCD's put onto 1 board and I'm only using one of them ) It just gives me a write error.  Can anyone tell me exactly what that means?  Is it indicative of a wiring problem or a software bug?  [See bottom for OWServer's output]

1) I power on the LCD and all chars are dark boxes ( uninitialized state)
I've then tried both
2a) Writing TEST to LCD_H/message
2b) I've also tried just clearing the screen

in both cases
3) No text shows on LCD.  The top row of chars go blank and bottom row stays same as uninitialized (full dark boxes).

I think my wiring is correct from what I can tell.  Any thoughts?  I'm using the windows build 2.5p6b owserver binary.  If I can get it working, I'm going to try the liveCD and see if I get similar results/issue.
-Scott

Here's the two debug outputs for reference.

/**************************************/
/**** OWHTTPD output   ******/
/**** Call: TEST > message *****/
/**************************************/

   CALL: PreParse line=GET /29.6EA701000000/LCD_H?message=TEST HTTP/1.1

  DEBUG: URL parse file=/29.6EA701000000/LCD_H, request=message, value=TEST
   CALL: WLcmd: GET     file: /29.6EA701000000/LCD_H    request: message        value: TEST     version: HTTP/1.1
   CALL: PARSENAME path=[/29.6EA701000000/LCD_H]
  DEBUG: Get from cache sn 29 6E A7 01 00 00 00 1E in=0x0 index=-1 size=1628461844
  DEBUG: Found in cache
   CALL: PARSENAME path=[/29.6EA701000000/LCD_H/message]
  DEBUG: Get from cache sn 29 6E A7 01 00 00 00 1E in=0x0 index=-1 size=1628461844
  DEBUG: Found in cache
 DETAIL: CHANGEDATA path=/29.6EA701000000/LCD_H/message value=TEST
   CALL: SERVER(0)WRITE path=/29.6EA701000000/LCD_H/message
  DEBUG: ParsedName_destroy /29.6EA701000000/LCD_H/message
   CALL: DIRECTORY path=/29.6EA701000000/LCD_H
   CALL: PARSENAME path=[/29.6EA701000000/LCD_H/clear]
  DEBUG: Get from cache sn 29 6E A7 01 00 00 00 1E in=0x0 index=-1 size=1628461844
  DEBUG: Found in cache
  DEBUG: ParsedName_destroy /29.6EA701000000/LCD_H/clear
   CALL: PARSENAME path=[/29.6EA701000000/LCD_H/home]
  DEBUG: Get from cache sn 29 6E A7 01 00 00 00 1E in=0x0 index=-1 size=1628461844
  DEBUG: Found in cache
  DEBUG: ParsedName_destroy /29.6EA701000000/LCD_H/home
   CALL: PARSENAME path=[/29.6EA701000000/LCD_H/message]
  DEBUG: Get from cache sn 29 6E A7 01 00 00 00 1E in=0x0 index=-1 size=1628461844
  DEBUG: Found in cache
  DEBUG: ParsedName_destroy /29.6EA701000000/LCD_H/message
   CALL: PARSENAME path=[/29.6EA701000000/LCD_H/screen]
  DEBUG: Get from cache sn 29 6E A7 01 00 00 00 1E in=0x0 index=-1 size=1628461844
  DEBUG: Found in cache
  DEBUG: ParsedName_destroy /29.6EA701000000/LCD_H/screen
  DEBUG: ParsedName_destroy /29.6EA701000000/LCD_H



/**************************************/
/**** OWServer output   ******/
/**** Call via OWWrite:  /29.6EA701000000/LCD_H/message  TEST   *****/
/**************************************/

  CALL: owserver: parse path=/29.6EA701000000/LCD_H/message
  CALL: PARSENAME path=[/29.6EA701000000/LCD_H/message]
 DEBUG: Get from cache sn 29 6E A7 01 00 00 00 1E in=0x0 index=-1 size=1628461844
 DEBUG: Found in cache
 DEBUG: Expired in cache
DETAIL: Checking presence of /29.6EA701000000/LCD_H/message
 DEBUG: Selecting a path (and device) path=/29.6EA701000000/LCD_H/message SN=29 6E A7 01 00 00 00 1E last path=00 00 00 00 00 00 00 00
  DATA: DS9490_reset
 DEBUG: Client address not yet parsed
  DATA: DS9490_reset: ok
 DEBUG:   Transaction verify = 0
 DEBUG: Add to cache sn 29 6E A7 01 00 00 00 1E in=0x0 index=-1 size=4
  CALL: Write message
 DEBUG: Get from cache sn 29 6E A7 01 00 00 00 1E in=0x6fb0087b index=-2 size=24576000
 DEBUG: Not found in cache
 DEBUG: Selecting a path (and device) path=/29.6EA701000000/LCD_H/message SN=29 6E A7 01 00 00 00 1E last path=00 00 00 00 00 00 00 00
  DATA: DS9490_reset
  DATA: DS9490_reset: ok
 DEBUG:   Transaction select = 0
 DEBUG:   Transaction send = 0
 DEBUG: Selecting a path (and device) path=/29.6EA701000000/LCD_H/message SN=29 6E A7 01 00 00 00 1E last path=00 00 00 00 00 00 00 00
  DATA: DS9490_reset
  DATA: DS9490_reset: ok
 DEBUG:   Transaction select = 0
 DEBUG:   Transaction send = 0
 DEBUG:   Transaction readin = 0
 DEBUG: Selecting a path (and device) path=/29.6EA701000000/LCD_H/message SN=29 6E A7 01 00 00 00 1E last path=00 00 00 00 00 00 00 00
  DATA: DS9490_reset
  DATA: DS9490_reset: ok
 DEBUG:   Transaction select = 0
 DEBUG:   Transaction send = 0
 DEBUG:   Transaction readin = 0
 DEBUG: Selecting a path (and device) path=/29.6EA701000000/LCD_H/message SN=29 6E A7 01 00 00 00 1E last path=00 00 00 00 00 00 00 00
  DATA: DS9490_reset
  DATA: DS9490_reset: ok
 DEBUG:   Transaction select = 0
 DEBUG:   Transaction send = 0
 DEBUG:   Transaction readin = 0
 DEBUG: Selecting a path (and device) path=/29.6EA701000000/LCD_H/message SN=29 6E A7 01 00 00 00 1E last path=00 00 00 00 00 00 00 00
  DATA: DS9490_reset
  DATA: DS9490_reset: ok
 DEBUG:   Transaction select = 0
 DEBUG:   Transaction send = 0
 DEBUG:   Transaction readin = 0
 DEBUG:   Transaction send = 0
 DEBUG:   Transaction readin = 0
  DATA: Write error on /29.6EA701000000/LCD_H/message (size=4)
 DEBUG: ParsedName_destroy /29.6EA701000000/LCD_H/message
 DEBUG: RealHandler: FS_ParsedName_destroy done
 DEBUG: RealHandler: cm.ret=0
 DEBUG: RealHandler: done







Ben Griffith wrote:
Hi,

I've got a 16x2 character LCD wired up on a breadboard, and I've switched back and forth between the Maxim design and the Hobby-Boards design, but I can't get anything to display on the LCD.  I can see the DS2408 in owfs, and when I power up the LCD I see all all dark boxes on the top row, which I think is what it should look like before it's initialized.  Then if I try to "echo hello > message" under LCD_H or LCD_M (depending on which way I have it wired at the time) the LCD goes blank.  I've tried playing with the contrast and I can see the spaces getting darker but there are no characters displayed.  I've checked and double checked my wiring, and switched back and forth between the two designs several times, swapped out 3 different DS2408s and three different LCDs, but I just can't get anything to display. 
Is there a trick to getting it to work?  Something I might have overlooked?  I'd really appreciate any help or advice anyone could give.

Thanks,
Ben Griffith


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