Serial LCD with SX28

crgwbr

Hey Everyone,
I'm using the LK202-25 LCD with Keypad interface that Parallax sells.· I can send it a single letter just fine, I can also send it a string to display, but I have to do it one letter or number at a time, which is a big pain.· If I send the string all at one (as in serout TX, baud, "string"), I only see the first letter of the string.· Why is this so?· Is there anyway around this?

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NerdMaster
For
Life

Chris Savage

Hello,
·
·· If you could post (attach) the code you’re using that might help us to help you.· Also, are you using a resonator or crystal for your clock or the internal osc?


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Chris Savage
Parallax Tech Support

crgwbr

Here is the code.· I am using an external 50 Mhz ceramic resonater.

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NerdMaster
For
Life

SailerMan

I am fairly sure that the Serout command can only handle one byte at a time. I probably shouldn't be commenting because I am having a Serial Nightmare on another thread.

Eric

Sparks-R-Fun

crgwbr,

SailorMan is right. The serout command transmits one serial byte at a time. To send several characters one after the other you will need to loop and update the character to be sent until all have been transmitted. This is not hard. In fact, there is a good example of how to do this in the SX/B help files. Click on the serout command. Scroll to the bottom of the page to where is says "Related projects:." Click on the RFID Reader Interface link and look at the serial subroutines in contains. Of particular interest to what you are trying to do is the LCD_OUT: subroutine. I have copied it here for you below but you may wish to examine the entire sample program to figure out how it works.

' -------------------------------------------------------------------------
' Use: LCD_OUT [noparse][[/noparse] aByte | string | label ]
' -- "aByte" is single-byte constant or variable
' -- "string" is an embedded literal string
' -- "label" is DATA statement label for stored z-String

LCD_OUT:
  tmpB1 = __PARAM1                              ' byte or string offset
  IF __PARAMCNT = 2 THEN                        ' string specified?
    tmpB2 = __PARAM2                            '   yes, save base
    DO
      READ tmpB2 + tmpB1, tmpB3                 ' read a character
      IF tmpB3 = 0 THEN EXIT                    ' if 0, string complete
      SEROUT LcdTx, LcdBaud, tmpB3              ' send the byte
      INC tmpB1                                 ' point to next character
      tmpB2 = tmpB2 + Z                         ' update base on overflow
    LOOP
  ELSE
    SEROUT LcdTx, LcdBaud, tmpB1                ' send the byte
  ENDIF
  RETURN
' -------------------------------------------------------------------------

LCD_OUT gets called as shown below which sends the entire string to the LCD.

LCD_OUT "Present ID."

I hope this helps!

- Sparks

crgwbr

Thanks, That did Help.

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NerdMaster
For
Life

Post Edited (crgwbr) : 10/9/2006 6:49:19 PM GMT