Graphical Displays with PBP3

[richard]

i wrote this graphics lib to handle led dmd's [1/4 scan dot matrix displays] in mono, red/green or rgb in varing sizes up to 128x32 pixels.
it occured to me that with a little more effort it would make a general purpose graphic lib for nearly any display. so here it is.
it uses mikroe fonts that you can easily generate. the variable width fonts can be up to 23 bits wide if you like.

a driver for ssd1306, nokia and the ubiquitious 128x64 glcd are included with a small demo for each.
note this is pic18 pbp3 only and if a mssp port is warranted then its used. there are more functions in the lib than the USERCMDS
indicate, i never use them all. i could not be bothered making the usecmd code for everything
i might publish the led dmd stuff at sometime when i work out dma->spi transfers with a k42


and some fonts


and some demos

[Jerson]

You've done an excellent job. Would you consider posting a small video demo to visualize the results?

Warm wishes

[richard]

i dropped my camera and its not too happy, the phone makes ridiculous high res movies too big to use online
so how about a sim still shot




nokia 7110 too

[Ioannis]

That is awesome!

Thanks for sharing,
Ioannis

[rocket_troy]

Fantastic work again Richard!

Would you have any particular recommendations for a display to purchase for a newbie just as a play-around learning tool ?

Regards,

Troy

[richard]

if you don't mind waiting a few weeks the nokia 5110 from china is <$5 . the 7110 have a weird connector and are best avoided imo ,both are good size
not too many pins needed, 3-5v ok.
the ssd1306 are about $8 locally but they are pretty small need only two pins if you get i2c variant, 3-5v ok.
if you catch a special at https://www.rockby.com.au/Index2012.cfm the 128x64 glcd can be real cheap < $5 but need heaps of pins to drive them 5v only.
they all work .

[rocket_troy]

Thanks Richard,
Ordered a 5110 from Ebay. Looking forward to having a play.

Cheers,

Troy

[rocket_troy]

Richard,
Received my 5110 display today and have just started to have a play. The nokia demo appears to display perfectly - excellent. I'm a bit stumped on one thing I'm trying to do. The nokia demo draws a circle:

DRAWCIRCLE 64,15,12

which I assume is a circle located a x=64, y=15 and radius of 12 yeah?

so I'm trying to draw a line from the centre of the circle to the top of the circle (or vice versa) so I tried:

DRAWLINE 64,3,64,15,1

which I assume is drawing a line from starting point X=64, Y=3 to ending point X=64, Y=15

And indeed the line starts at the correct point (top centre) but only extends down 7 or 8 pixels ie not to centre of the circle?

Any ideas?

Regards,

Troy

[rocket_troy]

So, what's happening (for me) is for a line that's wider than it is higher (or equal), it appears from very initial testing to draw correctly. But if it's higher than it is wider, it doesn't?

Troy

[richard]

it appears there was a bug in drawing vertical lines. this now works

[rocket_troy]

Excellent! Hats off again Richard. This looked like a lot of work in putting it all together. If we ever meet, the drinks will definitely be on me!

Troy

[rocket_troy]

Richard,
Another question: can we pass variables as parameters to these geometric routines?

Like:

DRAWLINE My_x1, My_y1, My_x2, My_y2, 1

So far I'm trying to pass byte size variables but getting illegal opcode messages at compile?

Troy

[richard]

Another question: can we pass variables as parameters to these geometric routines?

EASY , Just add the needed macro's to the include file, you can dial up whatever you like

http://www.picbasic.co.uk/forum/show...hlight=ssd1306
http://www.picbasic.co.uk/forum/show...hlight=usercmd
http://support.melabs.com/forum/picb...er/usercommand

[rocket_troy]

EASY , Just add the needed macro's to the include file, you can dial up whatever you like

oookay

[richard]

DRAWLINE My_x1, My_y1, My_x2, My_y2, 1

You need a macro like
DRAWLINE?BBBBC
the error message will tell you this does not exist

the existing drawline macros

;LINE 
DRAWLINE?WWWW  macro X0in ,Y0in ,X1in ,Y1in
    MOVE?WB    X0in ,_s_xstart
    MOVE?WB    X1in ,_s_xend
    MOVE?WB    Y0in ,_s_ystart
    MOVE?WB    Y1in ,_s_yend
    L?CALL _dline 
    endm  
DRAWLINE?WWBW  macro X0in ,Y0in ,X1in ,Y1in
    MOVE?WB    X0in ,_s_xstart 
    MOVE?BB    X1in ,_s_xend
    MOVE?WB    Y0in ,_s_ystart
    MOVE?WB    Y1in ,_s_yend
    L?CALL _dline 
    endm 
DRAWLINE?WWBB  macro X0in ,Y0in ,X1in ,Y1in
    MOVE?WB    X0in ,_s_xstart
    MOVE?BB    X1in ,_s_xend
    MOVE?WB    Y0in ,_s_ystart
    MOVE?BB    Y1in ,_s_yend
    L?CALL _dline 
    endm  
DRAWLINE?WWCC  macro X0in ,Y0in ,X1in ,Y1in
    MOVE?WB    X0in ,_s_xstart
    MOVE?CB    X1in ,_s_xend
    MOVE?WB    Y0in ,_s_ystart
    MOVE?CB    Y1in ,_s_yend
    L?CALL _dline 
    endm       
DRAWLINE?WWWB  macro X0in ,Y0in ,X1in ,Y1in
    MOVE?WB  X0in ,_s_xstart
    MOVE?WB  X1in ,_s_xend 
    MOVE?WB  Y0in ,_s_ystart
    MOVE?BB  Y1in ,_s_yend
    L?CALL _dline 
    endm        
DRAWLINE?BBBB  macro X0in ,Y0in ,X1in ,Y1in
    MOVE?BB     X0in ,_s_xstart
    MOVE?BB     X1in ,_s_xend
    MOVE?BB     Y0in ,_s_ystart
    MOVE?BB     Y1in ,_s_yend
    L?CALL _dline 
    endm  
DRAWLINE?CCCC  macro X0in ,Y0in ,X1in ,Y1in
    MOVE?CB  X0in ,_s_xstart
    MOVE?CB  X1in ,_s_xend
    MOVE?CB  Y0in ,_s_ystart
    MOVE?CB  Y1in ,_s_yend
    L?CALL   _dline 
  endm  
DRAWLINE?CCCB  macro X0in ,Y0in ,X1in ,Y1in
    MOVE?CB  X0in ,_s_xstart
    MOVE?CB  X1in ,_s_xend
    MOVE?CB  Y0in ,_s_ystart
    MOVE?BB  Y1in ,_s_yend
    L?CALL   _dline 
  endm  
DRAWLINE?CCCW macro X0in ,Y0in ,X1in ,Y1in
    MOVE?CB  X0in ,_s_xstart
    MOVE?CB  X1in ,_s_xend
    MOVE?CB  Y0in ,_s_ystart
    MOVE?WB  Y1in ,_s_yend
    L?CALL   _dline 
  endm      
DRAWLINE?BBCC  macro X0in ,Y0in ,X1in ,Y1in
    MOVE?BB  X0in ,_s_xstart
    MOVE?CB  X1in ,_s_xend
    MOVE?BB  Y0in ,_s_ystart
    MOVE?CB  Y1in ,_s_yend
    L?CALL _dline 
    endm 
DRAWLINE?CCCCC  macro X0in ,Y0in ,X1in ,Y1in,Col
    MOVE?CB  Col ,_colour
    MOVE?CB  X0in ,_s_xstart
    MOVE?CB  X1in ,_s_xend
    MOVE?CB  Y0in ,_s_ystart
    MOVE?CB  Y1in ,_s_yend
    L?CALL   _dline 
  endm

you could add this

DRAWLINE?BBBBC  macro X0in ,Y0in ,X1in ,Y1in,Col
    MOVE?BB     X0in ,_s_xstart
    MOVE?BB     X1in ,_s_xend
    MOVE?BB     Y0in ,_s_ystart
    MOVE?BB     Y1in ,_s_yend
    MOVE?CB     Col  ,_colour
    L?CALL _dline 
    endm

or set the colour manually
eg colour=1

and use
DRAWLINE My_x1, My_y1, My_x2, My_y2
which already exists
DRAWLINE?BBBB
with a mono display you probably wont change the colour too often

[richard]

a 5 input user command has the potential to need 5 raised to the 7th power of macros to cover every input permutation possible
a ridiculous number, i only ever create what seems useful to me. it's trivially easy to add any other combination you app calls for
and the compiler error virtually spells it out for you

[rocket_troy]

a 5 input user command has the potential to need 5 raised to the 7th power of macros to cover every input permutation possible
a ridiculous number, i only ever create what seems useful to me. it's trivially easy to add any other combination you app calls for
and the compiler error virtually spells it out for you

Yeah, I did get that part from reading the links you provided - which makes it understandable (I guess) why you don't include that broad functionality.

Thanks for the example though. I now get it

Cheers,

Troy

[rocket_troy]

Richard,
with the Nokia 5110 demo settings, the "width" constant is set at 88 instead of 84. Can you explain the reason for that? Like, with other displays, is it just a case of trial & error to gather this parameter or is available in documentation or from standard formula?

Thanks,

Troy

[richard]

needs to multiple of 8 for the rotation to work properly

[rocket_troy]

okay, that was simpler than I expected. Thx

[rocket_troy]

Richard,
would your drivers (with some tweaking of the input pins) be compatible with the jlx12864g-086 display? Someone online mentioned it would be a good substitute for the 5110 but they seem (to me) to be quite different interfaces?

Troy

[richard]

don't see why not. they look pretty much like a 128x64 glcd with a serial i/f
do you have a data sheet ? , i can't locate an English version

[rocket_troy]

Unfortunately I can't find one. Amazon says the IC is a UC1701X which there are English data sheets for. Attached is an online translation if that's any use?

JLX12864G-086.pdf

TP

[richard]

looking at that ds i expect it would require its own driver to be written to use it with my graphics lib, should be easy enough. i don't have a display to experiment with and
my simulator does not include a model for the display either so don't hold your breath.

[rocket_troy]

No probs.

Troy

[richard]

Driver for st7920 display for my system

notes
you need to change in/out of graphics mode to use lcdout commands on the display if you have the need, i don't

it doesn't need the r/w pin when used with frame buffering but i did not test it

[richard]

serial i/f and busy flag check added for st7920

'****************************************************************'*  Name    : ST7920-LCD_DEMO.PBP                               *
'*  Author  : RICHARD                                           *
'                                                               *
'*  Date    : 4/8/2017                                          *
'*  Version : 1.0                                               *
'*  Notes   : pic18f26k22                                       *
'*          :  ST7920-LCD 128X64                                *
'****************************************************************
#CONFIG
  CONFIG  FOSC = INTIO67
  CONFIG  PLLCFG = ON
  CONFIG  PRICLKEN = ON
  CONFIG  FCMEN = OFF
  CONFIG  IESO = OFF
  CONFIG  PWRTEN = ON
  CONFIG  BOREN = SBORDIS
  CONFIG  BORV = 190
  CONFIG  WDTEN = OFF
  CONFIG  WDTPS = 32768
  CONFIG  CCP2MX = PORTC1
  CONFIG  PBADEN = OFF
  CONFIG  CCP3MX = PORTB5
  CONFIG  T3CMX = PORTC0
  CONFIG  HFOFST = ON
  CONFIG  P2BMX = PORTB5
  CONFIG  MCLRE = EXTMCLR
  CONFIG  STVREN = ON
  CONFIG  LVP = OFF
  CONFIG  XINST = OFF
  CONFIG  DEBUG = OFF
  CONFIG  CP0 = OFF
  CONFIG  CP1 = OFF
  CONFIG  CP2 = OFF
  CONFIG  CP3 = OFF
  CONFIG  CPB = OFF
  CONFIG  CPD = OFF
  CONFIG  WRT0 = OFF
  CONFIG  WRT1 = OFF
  CONFIG  WRT2 = OFF
  CONFIG  WRT3 = OFF
  CONFIG  WRTC = OFF
  CONFIG  WRTB = OFF
  CONFIG  WRTD = OFF
  CONFIG  EBTR0 = OFF
  CONFIG  EBTR1 = OFF
  CONFIG  EBTR2 = OFF
  CONFIG  EBTR3 = OFF
  CONFIG  EBTRB = OFF
#ENDCONFIG
    
    DEFINE OSC 64


   
    #DEFINE colours 1   ;1 mono 2 rg or 3 rgb
    width  con 128      ;
    height con 64      ;
    'use serial i/f
    #define  stserial 1
    include "grx.pbpMOD" 
    include "st7920.pbpmod" 
    include "font.bas"
    include "bignum.bas"       
    include "bigchr.bas"
    BUFF       VAR BYTE[32]
    ani_h var word  bank0
    ani_r var byte
    ani_c var byte
    OSCCON=$70
    OSCTUNE.6=1
    while ! osccon2.7 :WEND    ;wait for pll
    ANSELB=0
    ANSELC=0
    ANSELA=0 
    
    trisc = %11010101 ;cs,sck,sdo are output




    gosub st7920_init    'graphic mode
    SETFONT FONT5x7
    gosub grf_clr
    
    
    ani_r=%10101011
    ARRAYWRITE BUFF,[bin8 ani_r ,0]
    DMDSTR 3,4,buff,1
    for ani_c=0 to 7
    ani_h=ani_h<<2
    if  ani_r.7 then ani_h=ani_h+3
    ani_r=ani_r<<1
    next
    ARRAYWRITE BUFF,[bin16 ani_h ,0]
    DMDSTR 3,12,buff,1   
    
    


    ani_r=%10101011
    ARRAYWRITE BUFF,[bin8 ani_r ,0]
    DMDSTR 3,20,buff,1


X VAR WORD




x = ani_r;
x = (x ^ (x << 4)) & $0f0f;
x = (x ^ (x << 2)) & $3333;
x = (x ^ (x << 1)) & $5555;
ani_h = x | (x << 1);




ARRAYWRITE BUFF,[bin16 ani_h ,0]
DMDSTR 3,28,buff,1
       
 gosub show 



stop

'****************************************************************'*  Name    : st7920.pbpmod                                     *
'*  Author  : richard                                           *
'*  Notice  : Copyright (c) 2021 caveat emptor                  *
'*          : All Rights Reserved                               *
'*  Date    : 23/10/2021                                        *
'*  Version : 1.0                                               *
'*  Notes   : R/W NOT USED, HAS FRAME BUFFER INSTEAD            *
'*          : LEVERAGES PBP LCD ROUTINES                        *
'**************************************************************** 
'SCREEN MAP    128X64
'ROW COLUMNS  [WORDS]
' 0 | 0 1... 6  7
' . |
' . |
' . |
' 30| 
' 31| 0 1... 6  7
' 0 | 8 9...14 15
' . |
' . |
' 30|
' 31| 8 9...14 15


'  usual  LCD defines are used  eg


'    DEFINE LCD_BITS 4 	'defines the number of data interface lines (4 or 8) 
'    DEFINE LCD_DREG PORTB	'defines the port where data lines are connected to
'    DEFINE LCD_DBIT 0	'defines the position of data lines for 4-bit interface (0 or 4)
'    DEFINE LCD_RSREG PORTB	'defines the port where RS line is connected to
'    DEFINE LCD_RSBIT 6 	'defines the pin where RS line is connected to 
'    DEFINE LCD_EREG PORTB 	'defines the port where E line is connected to 
'    DEFINE LCD_EBIT 4 	'defines the pin where E line is connected 
'    DEFINE LCD_COMMANDUS 1000 	'defines the delay after LCDOUT statement 
'    DEFINE LCD_DATAUS 40 		'delay in micro seconds
'    DEFINE LCD_RWREG PORTB ' LCD read/write port
'    DEFINE LCD_RWBIT 5 ' LCD read/write pin bit
''END of LCD DEFINES 




st7920_page var byte
st7920_gli  var byte
st7920_inx  var word
st7920_tmx  var word
st7920_lfx  var word
st7920_bf   var byte






goto overst7920
#ifndef stserial  
'4 or 8 bit parallel normsl pbp lcd defs
st7920_init:
    lcdout $FE,$24 'In same instruction cannot alter DL, RE and G at once. Make sure that change DL or G first and then RE.
    lcdout $FE,$26 
    bgcolour = 0
    colour = 1
return 


st7920_send:   'd in R3
@  L?CALL lcdsend
return    
    




st7920_busy:
   TRISB=TRISB&240
ASM 
    MOVLW 0X0F
    IORWF LCD_DREG+0X12,F
    bsf   LCD_RWREG ,LCD_RWBIT
    NOP
    bcf   LCD_RSREG ,LCD_RSBIT
    NOP
    bsf   LCD_EREG ,LCD_EBIT
    NOP
    NOP
    NOP
    NOP
    MOVFF LCD_DREG ,_st7920_bf
    MOVF  LCD_DREG,W
    BANKSEL  _st7920_bf
    MOVWF   _st7920_bf
    bcf   LCD_EREG ,LCD_EBIT
    NOP
    NOP 
    NOP
    NOP        
    bsf   LCD_EREG ,LCD_EBIT
    NOP
    NOP
    NOP
    NOP
    bcf   LCD_EREG ,LCD_EBIT
    NOP
    NOP 
    NOP
    NOP
    bsf   LCD_RSREG ,LCD_RSBIT
    bcf   LCD_RWREG ,LCD_RWBIT
    NOP
    NOP
    MOVLW 0XF0
    ANDWF LCD_DREG+0X12,F
    BANKSEL 0
    ENDASM
 RETURN
 
setxy:
GOSUB   st7920_busy
IF   st7920_bf.3 THEN  GOTO setxy
ASM
    MOVLW 128
    BANKSEL _st7920_gli
    IORWF   _st7920_gli,W
    BANKSEL R3
    MOVWF   R3
    bcf   LCD_RSREG ,LCD_RSBIT
    MOVE?CT 1,FLAGS ,0
    L?CALL _st7920_send
    MOVLW 128
    BANKSEL _st7920_page
    IORWF   _st7920_page,W
    BANKSEL R3
    MOVWF   R3 
    bcf   LCD_RSREG ,LCD_RSBIT   
    MOVE?CT 1,FLAGS ,0
    L?CALL _st7920_send
    BANKSEL 0
ENDASM
return
senddat16:
GOSUB   st7920_busy
IF   st7920_bf.3 THEN   GOTO setxy
asm
    MOVE?BB   _st7920_tmx ,R3
    bsf   LCD_RSREG ,LCD_RSBIT
    MOVE?CT 1,FLAGS ,0
    L?CALL _st7920_send
    bsf  LCD_RSREG ,LCD_RSBIT
    MOVE?BB   _st7920_tmx+1 ,R3
    MOVE?CT 1,FLAGS ,0
    L?CALL _st7920_send
    BANKSEL 0
ENDASM


return 
show:     'SEE MAP
    for  st7920_GLi = 0 to 31
        st7920_page = 0
        gosub setxy
        st7920_inx = st7920_gli*16
        for st7920_page = 0 TO 7    ;IS WORDS 0-7 IN TOP HALF
            st7920_tmx.lowbyte = fbr[st7920_inx] REV 8
            st7920_inx = st7920_inx + 1
            st7920_tmx.highbyte = fbr[st7920_inx]  REV 8
            st7920_inx = st7920_inx + 1
            gosub  senddat16
        next
        st7920_inx = st7920_gli*16+512
        for st7920_page = 0 TO 7     ;IS WORDS 8-15 IN BOTTOM HALF
            st7920_tmx.lowbyte = fbr[st7920_inx]  REV 8
            st7920_inx = st7920_inx + 1
            st7920_tmx.highbyte = fbr[st7920_inx]  REV 8
            st7920_inx = st7920_inx + 1
            gosub  senddat16
        next 
    next     
return


;spi
#else
st7920_dat   var byte
'spi pins used
st7920_cs   var latc.1 
'st7920_sck  is latc.3
'st7920_sdi  is latc.4
'st7920_sdo  is latc.5


st7920_init:
  SSP1CON1=$22  ;$22 fastest that works @64m
  SSP1STAT=$40
  st7920_cs=1
  st7920_dat = %00001100
  gosub ST7920Command
  st7920_cs=0
  pause 20
  st7920_cs=1
  st7920_dat = %00100100 ; //EXTENDED INSTRUCTION SET
  gosub ST7920Command
  st7920_dat = %00100110 ; //EXTENDED INSTRUCTION SET
  gosub ST7920Command
  st7920_cs=0
  bgcolour = 0
  colour = 1
return  


setxy: 
    st7920_dat = st7920_gli| 128
    gosub ST7920Command
    st7920_dat = st7920_page| 128 
    gosub ST7920Command
return 




ST7920Data: 
  	PIR1.3=0     
    SSP1BUF = %11111010 
    WHILE   !PIR1.3 :    wend
    PIR1.3=0     
    SSP1BUF = (st7920_dat & %11110000)
    WHILE   !PIR1.3 :    wend
    PIR1.3=0     
    SSP1BUF = (st7920_dat<< 4)
    WHILE   !PIR1.3 :    wend
  	pauseus 50
return


ST7920Command:   
  	PIR1.3=0     
    SSP1BUF = %11111000
    WHILE   !PIR1.3 :    wend
    PIR1.3=0     
    SSP1BUF = st7920_dat & %11110000
    WHILE   !PIR1.3 :    wend
    PIR1.3=0     
    SSP1BUF = (st7920_dat<< 4)
    WHILE   !PIR1.3 :    wend
  	pauseus 100
return


show:     'SEE MAP
    for  st7920_GLi = 0 to 31
        st7920_cs=1
        st7920_page = 0
        gosub setxy
        st7920_inx = st7920_gli*16
        for st7920_page = 0 TO 7    ;IS WORDS 0-7 IN TOP HALF
            st7920_dat = fbr[st7920_inx] REV 8
            gosub  ST7920data
            st7920_inx = st7920_inx + 1
            st7920_dat = fbr[st7920_inx]  REV 8
            gosub  ST7920data
            st7920_inx = st7920_inx + 1
        next
        st7920_inx = st7920_gli*16+512
        for st7920_page = 0 TO 7     ;IS WORDS 8-15 IN BOTTOM HALF
            st7920_dat = fbr[st7920_inx] REV 8
            gosub  ST7920data
            st7920_inx = st7920_inx + 1
            st7920_dat = fbr[st7920_inx]  REV 8
            gosub  ST7920data
            st7920_inx = st7920_inx + 1
        next
       st7920_cs=0  
    next
return


senddat16:
            st7920_dat = st7920_tmx REV 8
            gosub  ST7920data
            st7920_dat = (st7920_tmx>>8) REV 8
            gosub  ST7920data
return
#endif






overst7920:

[rocket_troy]

Hi Richard,
Ordered a couple of st7920 displays for this and in the mean time I'm revisiting the Nokia display. 1 question: you're driving the 18F26K22 @64MHz for the sample codes; is that necessary? Can I drive the display using the same processor at, say, 16 MHz?

Thanks,

Troy

[richard]

1 question: you're driving the 18F26K22 @64MHz for the sample codes; is that necessary? Can I drive the display using the same processor at, say, 16 MHz?

no not essential any speed will work, its just slower. the hw 12c / spi speeds can be tweaked in some cases to compensate

[rocket_troy]

Hi Richard,
I've received my "st7920" displays from China (at least they're supposed to be) but I can't get anything from them from running your original code attachments in post #26. I haven't tried any of the code in #27 yet as I'm having problems with the "st7920.pbpmod" code having duplicate subroutines???
Anyway, can you possibly post a link or example of the wiring to this display. So far, I've connected all the 4 data lines, E bit, RS & RW bits to the declared PortB pins in your code. I've connected the V0 pin via a 10K pot and I've pulled up the serial/parallel selection pin to parallel selection and of course connected the power rails.

Thanks,

Troy

[richard]

for parallel i/f the connections are as defined
'LCD defines begin here
' DEFINE LCD_BITS 4 'defines the number of data interface lines (4 or 8)
' DEFINE LCD_DREG PORTB 'defines the port where data lines are connected to
' DEFINE LCD_DBIT 0 'defines the position of data lines for 4-bit interface (0 or 4)
' DEFINE LCD_RSREG PORTB 'defines the port where RS line is connected to
' DEFINE LCD_RSBIT 6 'defines the pin where RS line is connected to
' DEFINE LCD_EREG PORTB 'defines the port where E line is connected to
' DEFINE LCD_EBIT 4 'defines the pin where E line is connected
' DEFINE LCD_COMMANDUS 1500 'defines the delay after LCDOUT statement
' DEFINE LCD_DATAUS 60 'delay in micro seconds
' DEFINE LCD_RWREG PORTB ' LCD read/write port
' DEFINE LCD_RWBIT 5 ' LCD read/write pin bit
' 'END of LCD DEFINES

for serial i/f the connections are the mssp sdi sdo sck pins plus what you pick for st7920_cs
the st7920_rst pin was not required in my tests.

for a 26k22 i used
'spi pins used
'st7920_rst var latc.0
st7920_cs var latc.1
'st7920_sck is latc.3
'st7920_sdi is latc.4
'st7920_sdo is latc.5

I'm having problems with the "st7920.pbpmod" code having duplicate subroutines???

there is no problem pbp just doesn't understand conditional compilation, ignore the warnings

[rocket_troy]

there is no problem pbp just doesn't understand conditional compilation, ignore the warnings

Maybe it's because I thought I needed to compile that include file (on its own) where I probably don't?

Anyway... hmmm... I'll recheck everything and maybe try the serial option if I can't get the parallel working. So far I can't see anything I was doing wrong.

Cheers,

Troy

[richard]

Maybe it's because I thought I needed to compile that include file (on its own)

include files will seldom if ever compile on their own

[rocket_troy]

include files will seldom if ever compile on their own

Cool. I think the parallel version did which probably gave me the wrong assumptions. Anyway... couldn't get the parallel option working after trying both displays and throwing everything at it. I'm guessing there was a jumper fuse on the display that needed soldering closed to configure the data lines from 8 to 4, but I couldn't find any datasheet for the display so gave up that and went to serial. Took a bit of head scratching to match up the I2C lines to completely different labelled pads on the display, and then I finally got something from the display - a bunch of plain (non graphical looking) 1s and 0s. Took me 5-10 mins to figure out that's actually what was supposed to be there for the serial code - I was expecting demo graphics and large text - but that simply required copying over that stuff from the parallel code.
So, good stuff again Richard. Hats off and thanks again for the assistance.

Cheers,

Troy

[richard]

glad you got something to work

for parallel mode there is a pin PSB that needs to be set high on the display low for serial

i used this ds for reference

[rocket_troy]

for parallel mode there is a pin PSB that needs to be set high on the display low for serial

yeah, I knew about that - that's actually what I was referring to in my post #30, BUT what I didn't know (from glancing over the datasheet you just provided) was that I might have needed to pull data line #5 to ground to configure 4 line mode . Damn.

Cheers,

Troy

[richard]

i don't remember doing that and there was no pin on the 20 pin connector to do that. maybe there was a jumper on the display but i thought it was a software selection.
the parallel conn is on d3 - d7 with d0 - d3 grounded
the display is off in another project and no longer available to me for confirmation

[rocket_troy]

Well, there's 2 things I never considered - (1) using the upper 4 data lines for transfer and (2) grounding the unused.
It's probably worth mentioning (for a heads up to others) the display I'm using has a serial/parallel 3 pad jumper on the back that was soldered to parallel setting as purchased. I needed to change that to serial in order to operate in serial mode. Whether that eliminates the need to pull/push the PSB pad I never bothered finding out - I just assumed the PSB pad still needed setting.

edit: just after posting that I realised that jumper is probably a direct link to the PSB pad to push or pull - duh.

Troy

[rocket_troy]

Richard,
Is it a big deal adding a character like a colon to the large font table? Working out the dot matrix for the character should be pretty straight forward, but not sure about the indexing and whatnot?

Thanks,

Troy

[richard]

you can use your own fonts Generated by MikroElektronika GLCD Font Creator 1.2.0.0
the font headers have some basic details on how to pbp-ify MikroElektronika fonts

;//Font Generated by MikroElektronika GLCD Font Creator 1.2.0.0
;//MikroElektrnika 2011
;//http://www.mikroe.com
;
;//GLCD FontName : Comic_Sans_MS10x14
;//GLCD FontSize : 10 x 14
; needs a few tweaks for pbp weaknesses
;no odd data lines allowed ,shift bytes up to even lines out , no commas on line ends
;do not add or remove any bytes
;const char bignum[] = {