Any idea's on porting this to PBP?

[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?

[Darrel Taylor]

Thanks, but the credit goes to Scott Edwards on that one.

If you have a PIC with an LVD (LOW VOLTAGE DETECT) pin. You can use it to generate an interrupt when it detects the loss of power.

Then you can imediately set all pins to input and shut-down any on-chip peripherals to save current.

You should be able to run long enough to save about 8-10 bytes with just 10uf or so..

[Archangel]

Hello Everyone,
This is cool. Anyone got an idea how to force this code to display 4 digits all the time? From 0000 to 9999? Scotts code works well. I tried dispVal = 0000 prior to the LCDOUT I,cgRAM statement and that did alright to start counter at zero and eliminate the initial display of a psudorandom 4 digit number at startup, I am sure it is simple, alas so am I .