Any idea's on porting this to PBP?

[Darrel Taylor]

Hey Ryan,

mister_e's concept is correct, you just need to put it into the LCDOUT statement.

LCDOUT Nibble1, Nibble2, Nibble3, Nibble4

or you can just put it all in there in one shot...

LCDOUT pat.Highbyte>>4, pat.Highbyte&$0F, pat.LowByte>>4, pat.Lowbyte&$0F
<br>

[Ryan7777]

Still just a blank LCD, I expected to get at least some garbage on the display. anyone got any other idea's what might be wrong? I added:
LCDOUT "TEST"
PAUSE 1000
LCDOUT $FE, 1

to the code just before the demo loop part and it display's correctly and then clear screens, so i guess its not totally blank, but it doesn't do much else.
I also tried hooking the LCD to my BS2p and ran my modified version of the code using LCD out in proper pBasic format and it sorta worked but only displayed the bottom 1/4 of the numbers all shifted up to the top line. like what should be displaying on the 4th line of the LCD was showing on the top line and all the rest was off screen.

[mister_e]

There's few missing details here
OSC type & speed (4,8,16,20.... or internal)
LCD DEFINEs
Config Fuses
Schematic

Did you added ?
DEFINE LCD_LINES 4

You can also use LCDOUT $fe,1,"Hello"

Some LCD may need some COMMANDUS and DATAUS fine tuning too.

[Darrel Taylor]

Here is a complete modification of Scott Edwards Program for big nums.

Changes are marked in red, and have been tested.

;Initialize your hardware first

'BIGNUMS.BS2 (Display four 1" digits on 4x20 display)
' Connect the serial input of a Backpack-equipped 4x20 display to
' BS2 pin P0 and run this program. The program will define a set
' of symbols that allow it to display 4-line-tall numerals on the
' LCD. To incorporate this capability into your own programs, just
' substitute your code for the demo loop. When you want to display
' a value (0-9999) in big numerals, write it to dispVal, then
' gosub bigLCD.
I       con 254 ' Instruction prefix.
ClrLCD  con 1 ' Clear-LCD instruction.
N96N    con $4054 ' 9600 baud, inverted, no parity.
cgRAM   con 64 ' Address 0 of CG RAM.
EEptr   var word ' Pointer into EEPROM.
pat     var EEptr ' Alias for EEptr.
dispVal var word ' Value to be displayed as big digits.
temp    var byte ' Temporary byte variable.
decade  var word
nbl     var byte ' Index into number-pattern tables.
digit   var byte ' Current digit to display
line    var byte ' LCD line

LCDOUT I,ClrLCD
PAUSE 500

' ====This section may be omitted with newer (post July 96)
' ====4x20 Serial LCD modules. Cut from here...============== >>>
bitPat0 DATA 0,0,0,1,3,7,15,31 ' Left-right up-ramp shape.
bitPat1 DATA 0,0,0,16,24,28,30,31 ' Right-left " "
bitPat2 DATA 31,15,7,3,1,0,0,0 ' Left-right down ramp.
bitPat3 DATA 31,30,28,24,16,0,0,0 ' Right-left " "
bitPat4 DATA 0,0,0,0,31,31,31,31 ' Lower block.
bitPat5 DATA 31,31,31,31,0,0,0,0 ' Upper block.
bitPat6 DATA 31,31,31,31,31,31,31,31 ' Full block.
bitPat7 DATA 0,0,0,0,0,0,0,0 ' Full blank
' <<<...to here. ===============================================
;low 0 ' Make the serial output low
;pause 1000 ' Let the LCD wake up.
' ====This section may be omitted with newer (post July 96)
' ====4x20 Serial LCD modules. Cut from here...============= >>>
;serout 0,N96N,[I,cgRAM] ' Enter CG RAM.
LCDOUT I,cgRAM

for EEptr = 0 to 63 ' Write the bit patterns
    Read EEptr,temp ' to the LCD.
;    serout 0,N96N,[temp]
    lcdout temp
next
' <<<...to here. ===============================================
;serout 0,N96N,[I,ClrLCD] ' Clear the LCD.
LCDOUT I, ClrLCD
pause 1
' ========================================================================
' Demo Loop: Show dispVal in Big Numerals, Increment, Loop
' ========================================================================
again:
    gosub bigLCD
    dispVal = dispVal + 1
    pause 500
goto again
' ========================================================================
' Subroutine Displaying Large Numbers
' ========================================================================
bigLCD:
    for line = 0 to 3
        decade = 1000
        lookup line,[128,192,148,212],temp
        
;        serout 0,N96N,[I,temp]
        LCDOUT I, temp
        for digit = 3 to 0 step -1
            nbl = dispVal dig digit
            gosub getPattern
            if dispVal = 0 and digit = 0 then skip0
            if dispVal < decade then blankIt
            skip0:
;            serout 0,N96N,[pat.nib3,pat.nib2,pat.nib1,pat.nib0]
            LCDOUT pat.Highbyte>>4, pat.Highbyte&$0F, pat.LowByte>>4, pat.Lowbyte&$0F

            goto cont
            blankIt:
;            serout 0,N96N,["    "]
            lcdout "    "
            cont:
            if digit = 0 then skip1
;            serout 0,N96N,[32]
            LCDOUT 32
            skip1:
            decade = decade/10
        next
    next
return
' Subroutines Defining Big-Character Patterns
' ========================================================================
getPattern:
branch line,[first,second,third,fourth]
' 0 1 2 3 4 5 6 7 8 9
' --- --- --- --- --- --- --- --- --- ---
first:
lookup2 nbl,[$0551,$7067,$0551,$0551,$6776,$6555,$0557,$2556,$0551,$0551],pat
return
second:
lookup2 nbl,[$6776,$7767,$7743,$7743,$6776,$2441,$6041,$7703,$2443,$6776],pat
return
third:
lookup2 nbl,[$6776,$7767,$0577,$7751,$2556,$7776,$6776,$7767,$0551,$2536],pat
return
fourth:
lookup2 nbl,[$2443,$7464,$6444,$2443,$7776,$2443,$2443,$7767,$2443,$7443],pat
return

Not too hard eh.

[Ryan7777]

Ok, the step -1 was doing it, i tried LOOKUP2 as a last resort before my last post, but still didnt help. thanks, Darrel! works fine now. i probably would have never got that in a million years. Thanks again!

[Darrel Taylor]

Honestly..., I had to use the MCSP debugger to find the step -1. Saw that the FOR loop was never getting executed. Made it easy.

But a million years, you'd have got it.

Glad to help.
<br>

[websmith]

Darrel you are amazing!
I tried this out yesterday and it exactly what I'm looking for ( I am making a fuel consumption / complex odometer for my ancient Land Rover) and as I can't see close up without glasses, but have perfect long distance vision, a normal LCD display on the dashboard is quite useless and I had been considering large 7 seg display, but this is beautiful! Thanks a million.

PS: any tips on saving a counter on power-down? I was going to have the PIC running off big electrolytic for long power down delay, and then have one port sensing the instant loss of the (voltage divided) 12v ignition and then quickly write to EEProm, but would it be clever to use a brown out flag or something like that?