LCD Display works
Buck Rogers
Posts: 2,181
Hello!
When I bought the display at the beginning of last month I had plans of using it to display the activities of the parts in my collection. It happens that it works.
I took the sample code from the collection, as described here:
Ignore those items marked with the ' thing. They mark out first attempts to send text unassisted to the display.
First I had the program send out a stream of ordinary ASCII characters and in this case they were the classic group of 32 to 127 to be displayed on the thing. Since the display doesn't clear stuff unless the user wants it to, I added the clear display code next, and that was sent before the stream was sent as next.
I then selected from my collection a PAL16L8 and mounted it on a regular small breadboard. (Oddly enough its the same one mounted on the HWB.) And added two red LED to show activity. After working out the programming logic shown above I then sent the same thing to it, and now back, in this case I used a PULSIN command to capture it, (I was going to use the SERIN one but the structure behind was too arcane and would have been too involved.) the data it grabbed was stuffed into the second blurb, the Z1 variable, from there it was passed to the SEROUT one in the same fashion as the X one was used before. Obviously the displayed data does not match the first set of displayed data because of both the PAL16L8 and perhaps the structure of the PULSIN command.
However regardless of what happens now, the thing works and that's what matters.
Oh and Ron you owe me a box of Oreo Cookies.........
When I bought the display at the beginning of last month I had plans of using it to display the activities of the parts in my collection. It happens that it works.
I took the sample code from the collection, as described here:
[FONT=times new roman][SIZE=4]
[/SIZE][/FONT]' =========================================================================
'
' File...... Serial_LCD_Template.BS2
' Purpose... Template for Parallax Serial LCD
' Author.... (c) Parallax, Inc. -- All Rights Reserved
' E-mail.... support@parallax.com
' Started...
' Updated... 11 FEB 2005
'
' {$STAMP BS2}
' {$PBASIC 2.5}
'
' =========================================================================
' -----[ Program Description ]---------------------------------------------
' -----[ Revision History ]------------------------------------------------
' -----[ I/O Definitions ]-------------------------------------------------
TX PIN 0 ' serial output to LCD
PL1 PIN 1 ' To the PAL
PL2 PIN 2 ' From the PAL
' -----[ Constants ]-------------------------------------------------------
#SELECT $STAMP
#CASE BS2, BS2E, BS2PE
T2400 CON 396
T9600 CON 84
T19K2 CON 32
#CASE BS2SX, BS2P
T2400 CON 1021
T9600 CON 240
T19K2 CON 110
#ENDSELECT
LcdBaud CON T19K2
LcdBkSpc CON $08 ' move cursor left
LcdRt CON $09 ' move cursor right
LcdLF CON $0A ' move cursor down 1 line
LcdCls CON $0C ' clear LCD (use PAUSE 5 after)
LcdCR CON $0D ' move pos 0 of next line
LcdBLon CON $11 ' backlight on
LcdBLoff CON $12 ' backlight off
LcdOff CON $15 ' LCD off
LcdOn1 CON $16 ' LCD on; cursor off, blink off
LcdOn2 CON $17 ' LCD on; cursor off, blink on
LcdOn3 CON $18 ' LCD on; cursor on, blink off
LcdOn4 CON $19 ' LCD on; cursor on, blink on
LcdLine1 CON $80 ' move to line 1, column 0
LcdLine2 CON $94 ' move to line 2, column 0
LcdCC0 CON $F8 ' define custom char 0
LcdCC1 CON $F9 ' define custom char 1
LcdCC2 CON $FA ' define custom char 2
LcdCC3 CON $FB ' define custom char 3
LcdCC4 CON $FC ' define custom char 4
LcdCC5 CON $FD ' define custom char 5
LcdCC6 CON $FE ' define custom char 6
LcdCC7 CON $FF ' define custom char 7
' -----[ Variables ]-------------------------------------------------------
' -----[ EEPROM Data ]-----------------------------------------------------
' -----[ Initialization ]--------------------------------------------------
Reset:
HIGH TX ' setup serial output pin
PAUSE 100 ' allow LCD to initialize
HIGH PL1
LOW PL2
' -----[ Program Code ]----------------------------------------------------
Main:
' your code here
X VAR Word
Z VAR Word
Z1 VAR Word
SEROUT TX,LcdBaud,[LcdCls]
Z = 20
FOR X=32 TO 127
SEROUT TX,LcdBaud, [X]
PAUSE 750
SEROUT PL1,LcdBaud,[X]
PAUSE 375
PULSIN Pl2, Z, Z1
SEROUT TX, LcdBaud, [Z1]
' SEROUT TX,LcdBaud,[65]
' PAUSE 100
' SEROUT TX,LcdBaud,[66]
' PAUSE 100
' SEROUT TX,LcdBaud,[67]
' PAUSE 175
' SEROUT TX,LcdBaud,[32]
' GOTO Main
NEXT
END
' -----[ Subroutines ]-----------------------------------------------------
Ignore those items marked with the ' thing. They mark out first attempts to send text unassisted to the display.
First I had the program send out a stream of ordinary ASCII characters and in this case they were the classic group of 32 to 127 to be displayed on the thing. Since the display doesn't clear stuff unless the user wants it to, I added the clear display code next, and that was sent before the stream was sent as next.
I then selected from my collection a PAL16L8 and mounted it on a regular small breadboard. (Oddly enough its the same one mounted on the HWB.) And added two red LED to show activity. After working out the programming logic shown above I then sent the same thing to it, and now back, in this case I used a PULSIN command to capture it, (I was going to use the SERIN one but the structure behind was too arcane and would have been too involved.) the data it grabbed was stuffed into the second blurb, the Z1 variable, from there it was passed to the SEROUT one in the same fashion as the X one was used before. Obviously the displayed data does not match the first set of displayed data because of both the PAL16L8 and perhaps the structure of the PULSIN command.
However regardless of what happens now, the thing works and that's what matters.
Oh and Ron you owe me a box of Oreo Cookies.........
Comments
Do I? For what pray tell?!?
Hello!
For being right regarding the connectors. For putting up with everything I threw at the original discussion regarding the device. Most of all, reacting appropriately to the (now discontinued probably) clearance sale for the display and the others. But you don't really need to track down a box and find out where I live. I threw that in to prompt a response.
You know, generally if someone helps you out, you might owe them a box of cookies - not the other way around!!
In any case I'm glad you solved your problem.
Were any of the displays actually destroyed in your quest to resolve the issue?
Hello!
No thank goodness! I only have the one display like that here, and it is working just fine. And of course you are correct.
So far everything is working. My one issue is still tweaking the code.
On Tuesday when visiting Microcenter to collect the wires, and two items I might need for my other projects, I did see yet another display to add to the mix,
http://www.parallax.com/product/27979 that one is the 4 x 20 Serial LCD display with backlight.
I also saw a Prop board that was, well new to me,
http://www.parallax.com/product/32910 It is the Prop activity board.
And also new items to keep Quickie going.