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Forum Index : Microcontroller and PC projects : Modify existing graphics font?
| Author | Message | ||||
| 58kk90 Regular Member  Joined: 14/06/2023 Location: United KingdomPosts: 49 |
I've been playing with the Chinese Ebay ST7920 LCD's, I know that you can use additional fonts, and I have tried those successfully, but is it possible to modify the inbuilt fonts? Reason for the question is I am using font 4, which is I believe 10 x 16, it fits the space on the display perfectly, but I don't like the 0 character. It has a center dot, i'd prefer to have the zero with a slash through it. Rather than create an entire new font from scratch, is there any simple way to change just that one characater? or extract the entire font 4 and then edit the 0 character, I could then upload it as a new font between definefont lines. Tony |
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Mixtel90 Guru  Joined: 05/10/2019 Location: United KingdomPosts: 6781 |
AFAIK the built-in fonts are fixed. You can, as you say, create a new font with the changed zero. On the PicoMite this is a good use of the Library area of the flash as then the font isn't taking up a big chunk of your workspace. If you number it as font 4 it will replace the built-in one. I don't know how to copy a built-in font though. There'll probably be a way to do it but it's something I've never done. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| 58kk90 Regular Member Joined: 14/06/2023 Location: United KingdomPosts: 49 |
Thanks Mick, I guess that was really my question, how do I extract the actual font #4 to make a change? Googling didn't find much, nor searching the forum, perhaps I need to create the font afresh, I cannot seem to find any more 10 x 16 fonts yet to clone! Tony |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6781 |
There'll be someone along who can sort this out. :) I think the fonts were taken from a web site, which I can't find a link to at present. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| v.lenzer Regular Member Joined: 04/05/2024 Location: GermanyPosts: 49 |
Maybe this helps a little bit:https://www.thebackshed.com/forum/ViewTopic.php?TID=16495&PID=213882#213882 Edited 2024-07-29 17:29 by v.lenzer Best wishes! Joachim |
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phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2135 |
While you wait for somebody that knows how to do it, here is one possibility. A slightly less tedious method than creating from scratch may be to recover the font by using a PicoVGA or LCD panel that supports reading pixels back. Print the font to the display one character at a time then use nested for-next loops to read the pixels, saving them in 2D arrays. Edit the "0" array, then create the font from the data in those arrays. EDIT Too slow! The answer is above. Edited 2024-07-29 17:38 by phil99 |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6097 |
' Fnt_10x16.bas ' Font type : Full (224 characters) ' Font start : CHR$(32) ' Font size : 10x16 pixels ' Memory usage : 4484 bytes DEFINEFONT #8 E020100A 00000000 00000000 00000000 00000000 00000000 80000000 00020820 00082080 00208000 00000000 20810400 00001248 00000000 00000000 00000000 00000000 C21F2288 1F228820 008820C2 00000000 80000200 041249F8 0201F800 08F89044 00000002 00000000 800C79C0 09102040 0018F084 00000000 80010000 01092490 10429490 00F42084 00000000 40000100 00000810 00000000 00000000 00000000 40000000 01041020 04104000 00108000 00000000 00010000 00010420 01041040 00408000 00000000 00000000 810A0800 0A1CFCC1 00008080 00000000 00000000 00020800 0208FC81 00008000 00000000 00000000 00000000 00000000 04104000 00000002 00000000 00000000 0000FC01 00000000 00000000 00000000 00000000 00000000 0030C000 00000000 00000000 40000000 04081020 00000102 00000000 C0010000 C4114188 107164D1 00702042 00000000 80000000 00022860 02082080 00F88000 00000000 E1030000 40000104 04081020 00FC0102 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08102040 00FC0104 00000000 00000000 C40F0000 10420841 00F02084 00000000 00000000 84100000 10420821 40742186 00000410 00000000 C40F0000 02082080 00188000 00000000 F0030000 42081E00 07218410 00FC0080 00000000 C0010000 47104188 104104F1 00702042 00000000 C0010000 44104188 08410411 00DC4181 00000000 E0030000 03021080 104108C1 00F81044 00000000 00000000 840D0000 0D492491 00000080 00000000 00000000 840D0204 0D5924D1 00000182 00000000 00000000 840F0000 103C0011 00F81004 00000000 00000000 441041F8 10410411 00041144 00000000 00000000 00007F00 0000FC01 0000F007 00000000 80000000 C01F0820 00082080 0000F007 00000000 00000000 00010840 04081020 00F80000 00000000 00000000 02040810 01084000 00F80000 00000000 00020800 00092284 03204080 04081080 0000C003 00020800 80082180 08112040 013C50C0 00004000 00000000 00020800 0200FC01 00008000 00000000 00000000 42060000 09190060 00000080 00000000 00010400 00000840 00000000 00000000 00000000 00000000 00000000 000C3000 00000000 00000000 00000000 00000000 000C0000 00000000 00000000 40C00100 00010410 05641040 0010C000 00000000 10810B00 41041144 00000010 00000000 00000000 20010300 01020408 000000E0 00000000 00000000 00000000 C30F3F00 0F3FFCF0 0000F0C3 00000000 81000000 84083E24 08410411 0824E183 00000000 END DEFINEFONT Compliments of FontTweak. Jim VK7JH MMedit MMBasic Help |
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disco4now Guru Joined: 18/12/2014 Location: AustraliaPosts: 896 |
All the fonts are each in their own file in the source. e.g.Fnt_10x16.h With a bit of a tweak of the header (can't remember exactly what) they will load directly into FontTweak Picomite Source Latest F4 Latest H7 |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6097 |
The current FontTweak had a problem with the 10x16 font. There were TABs where I didn't allow for. An updated version will be upload in a day or two. Apart from that, change the extension from .h to .c but I will fix that too. VK7JH MMedit MMBasic Help |
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| 58kk90 Regular Member Joined: 14/06/2023 Location: United KingdomPosts: 49 |
Thanks to everyone who kindly replied, and especially to Jim who's solution was perfect Now the Zero has a diagonal line instead of a center dot. Tony. |
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Quazee137 Guru Joined: 07/08/2016 Location: United StatesPosts: 567 |
I think you can change the internal fonts. Hope this can help ST7920 PDF On a few other displays I have read the font e/roms and made changes to them. Quazee137 |
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