Nokia lcd include , small footprint to suit pic16's

[Mike, K8LH]

Is this a problem with PIC18 only, Richard? I haven't tried using a PSECT on PIC18, yet...

[richard]

I'm working with a 18f25k22 and getting much grief getting a PSECT to work as intended .
I could store the font as const unsigned int font [][3] { {0,0,0},{……}} but it would be nice to have an include that can be used in either
pic16 or pic18 chips

[Mike, K8LH]

Hi Richard.

I threw a couple PSECT tables into an XC8 program for an 18F14K22 and when I look at the .LST file it seems XC8 is avoiding those tables just as it should.

/************************************************************************
 *   Digits '0' thru '9' of a 10x14 font                                *
 ************************************************************************/
   #asm
   PSECT my10x14, class=CODE, abs, ovrld, space=0, delta=2
     ORG 0x3E00
   Font10x14:
     dw 0x0FFC, 0x1FFE, 0x3F07, 0x3383, 0x31C3, 0x30E3, 0x3073, 0x383F, 0x1FFE, 0x0FFC  ;  48 '0'
     dw 0x0000, 0x0000, 0x300C, 0x300E, 0x3FFF, 0x3FFF, 0x3000, 0x3000, 0x0000, 0x0000  ;  49 '1'
     dw 0x300C, 0x380E, 0x3C07, 0x3E03, 0x3703, 0x3383, 0x31C3, 0x30E7, 0x307E, 0x303C  ;  50 '2'
     dw 0x0C0C, 0x1C0E, 0x3807, 0x3003, 0x3003, 0x30C3, 0x30C3, 0x38C7, 0x1FFE, 0x0F3C  ;  51 '3'
     dw 0x03C0, 0x03E0, 0x0370, 0x0338, 0x031C, 0x030E, 0x3FFF, 0x3FFF, 0x0300, 0x0300  ;  52 '4'
     dw 0x0C3F, 0x1C3F, 0x3833, 0x3033, 0x3033, 0x3033, 0x3033, 0x3873, 0x1FE3, 0x0FC3  ;  53 '5'
     dw 0x0FFC, 0x1FFE, 0x38C7, 0x30C3, 0x30C3, 0x30C3, 0x30C3, 0x39C7, 0x1F8E, 0x0F0C  ;  54 '6'
     dw 0x0003, 0x0003, 0x0003, 0x0003, 0x3FC3, 0x3FE3, 0x0073, 0x003B, 0x001F, 0x000F  ;  55 '7'
     dw 0x0F3C, 0x1FFE, 0x39E7, 0x30C3, 0x30C3, 0x30C3, 0x30C3, 0x39E7, 0x1FFE, 0x0F3C  ;  56 '8'
     dw 0x003C, 0x007E, 0x30E7, 0x30C3, 0x38C3, 0x1CC3, 0x0EC3, 0x07E7, 0x03FE, 0x01FC  ;  57 '9'
   #endasm

/************************************************************************
 *   Packed 96 character 5x7 Font, 2.5-words-per-character, 240 words   *
 ************************************************************************/
   #asm
   PSECT myFonts, class=CODE, abs, ovrld, space=0, delta=2
     ORG 0x3F00
   Font5x7:

[richard]

extract from .lst , it all looks good yet the font is not there.

 114                           	psect	text
   115  3E00                     	org	15872	;# 
   116  3E00                     
   117                           ;# 
   118  3E00  0501 207F          	dw	1281,8319	;# 
   119  3E02  0000 0000 0000 005F 0000 	dw	0,0,0,95,0	;# 
   120  3E07  0007 0007 0014 3F94 3F94 	dw	7,7,20,16276,16276	;# 
   121  3E0C  122A 3FAA 0923 0988 3262 	dw	4650,16298,2339,2440,12898	;# 
   122  3E11  1B49 2AA2 2800 0283 0000 	dw	6985,10914,10240,643,0	;# 
   123  3E16  001C 1141 0000 20A2 0E00 	dw	28,4417,0,8354,3584	;# 
   124  3E1B  0A08 1F08 0A08 043E 0408 	dw	2568,7944,2568,1086,1032	;# 
   125  3E20  0050 1800 0008 0408 0408 	dw	80,6144,8,1032,1032	;# 
   126  3E25  0060 3000 0020 0808 0202 	dw	96,12288,32,2056,514	;#

[Mike, K8LH]

That's wierd. The tables show up in the LST file and in the HEX file but not in the Program Memory window...

Ok, section 6.2.9.3.4 in the XC8 User's Guide describes the PSECT "delta" parameter and as soon as I changed the parameters from "delta=2" to "delta=1" my two font tables showed up in the Program Memory window and my TBLPTR test code started working correctly in the simulator... Whew!

[richard]

test code started working correctly in the simulator... Whew!

I agree , you would think writing word sized data would need delta=2.

my brain hurts but it solves the problem , thanks mike

[Mike, K8LH]

You're very welcome, Sir. And thank you for all the help and hard work you've provided.

BTW, I'm liking this 128x32 I2C SSD1306 OLED display a lot... With built-in RAM for a 128x64 display, you can basically have two display screens. You can write data to one screen while displaying the other then toggle the display screen. Should make easy work for cursor characters, flashing colon characters for a clock, or displaying "odometer" type sliding numbers.