Hi Bill, Good to see that it works now for you.
I uploaded the library and two sample files to Github so they will be in the next Jallib release and the next bee-package. I tested them using I2C and SPI using the samples I created (one using font and graphics and one using only fonts). I started with the option to goto any pixel location but that will be a problem when using only fonts since you cannot read data back from the display (which is needed if a character like 8x12 only use half of the next line). Only in graphics mode this would be possible since then a cache is created and a character could then be written pixel by pixel but that required 1k of data space. I thought there is a glcd function for in the common library for writing character pixel by pixel but have not tried that. I may look at it later and as you suggested maybe add it as an option. And for the random pixels. It may also help to add an additional capacitor on +3.3Volt. Good luck with your project. Kind regards, Rob ________________________________ Van: [email protected] <[email protected]> namens Bill Beek <[email protected]> Verzonden: zaterdag 24 januari 2026 16:34 Aan: jallib <[email protected]> Onderwerp: Re: [jallib] Re: Update SSD1306 library supporting bigger font Hi Rob, I got your new lib tested with the 16F18857, everything looked fine. No trace of unwanted pixels. With the 16F1825 I still have unwanted pixels, I'll look into that further, maybe there's something wrong with the chip. I have performed all tests with 3.3 Volt Vdd. As you rightly pointed out, the displays are intended for a working voltage of max 3V3. As for the text lines, I think it's better to choose the position on the screen yourself, especially if you want to keep a little more space between the text lines. Perhaps you can do this as an option for users who do not want the fixed line spacing. For example, the 8x12 font gives problems with the fixed pages. Many Thanks for the good work. Kind regards, Bill. On Friday, January 23, 2026 at 6:50:41 PM UTC+1 Rob CJ wrote: Hi Bill, Today I received the displays and I tested the I2C version and it worked! I had of course the same issue with the characters on the left that where cut off. Attached you find an update of the library and a sample program. I made the following changes: 1. Fixed the pixel shift no now the '8' are positioned correctly 2. Removed the horizontal scroll procedures and diagonal scroll procedures since the SH1106 does not support that. The big font was also working but make sure you increase the character buffer as shown in the sample program since the default size is 1 byte which is insufficient. Then about your random pixels. I did not have them and I think I know why. When I used an ssd1306 in the past I also had random pixels. I saw on an osciloscope that the SSD1306 module generated a lot of noice on the IIC lines. This is also the case for the SH1106. The problem occurs when you use the module and the PIC both on 5Volt because the SH1106 operates at 3.3 Volt and so the I2C signals do not have a full swing to +5Volt and the noise is so high that it disturbs those signals changing a 1 into a 0 and the other way around. I solved this in the past by operating both the SSD1306 and the PIC at 3.3 Volt so that the whole level swing is used and that is also the set-up I used today for the SH1106. I had no random pixels in this set-up. So you have two options: 1. Operate both devices at 3.3. Volt 2. Use a level shifter between the PIC and the SH1106 if you want your PIC to run at 5Volt. If you look at the datasheet of both the SSD1306 and the SH1106 the inputs do not seem 5Volt tolerant so I wonder if they break down after some time if you use the PIC at 5Volt but I am not sure if that will occur. Next test is to see if the SPI version also works correctly. Last but not least a question (for all JAL users). The device - and the goto function - works for fonts horizontal with pixels but vertical with pages 0..7. I used pages since that is what I also saw in other libraries but it limits where you can place text vertically. I wonder if I should change that so that you can also use pixels for the vertical orientation so that you could position your charaters anywhere vertically and not only on pages 0..7. Do you think that is a feature that would be useful? I need to write additional code for this and if that works it should also be changed for the SSD1306 but this will result in all users that use this library to implement some changes to rearrange the text based on pixels. Let me know what you - all - think. Thanks. Kind regards, Rob ________________________________ Van: [email protected] <[email protected]> namens Rob CJ <[email protected]> Verzonden: donderdag 22 januari 2026 18:51 Aan: jallib <[email protected]> Onderwerp: Re: [jallib] Re: Update SSD1306 library supporting bigger font Hi Bill, Good to know. About the fonts. The two fonts you mentioned are vertical oriented fonts like the display. The larger fonts are most likely horizontal fonts for which extra code is in the library to rotate this but it needs a character buffer for that. If you want to use the larger fonts you have to increase that character buffer as described in the library, see info below. In the SSD1306 I made this character buffer as large as was needed for the biggest fonts we currently have but if you do not use such a big font, it is waste of data space. In the SH1106 library I have set this buffer to the minimum of 1 so for each horizontal font you use (which are the larger fonts) you have to increase this size. I also changed this for the SSD1306 library - so that you know - but I did not upload that since I first want to see what comes out of testing the SH1106 library, -- When using a horizontal oriented character font, a character buffer -- is needed with the size of the used font, see the font library value -- FONT_xxxx_BYTE_PER_CHAR for the font you are using. -- The default size of this buffer is set to the minimum value of 1. -- For example the 12x16 horizontal font uses 32 bytes for one character -- and so we can set the character buffer to this size by: -- -) const SH1106_CHAR_BUFFER_SIZE = 32 -- No buffer is required for vertical oriented fonts. For vertical fonts -- only fonts with a maximum height of 8 pixels are supported. Kind regards, Rob ________________________________ Van: [email protected] <[email protected]> namens Bill Beek <[email protected]> Verzonden: woensdag 21 januari 2026 20:25 Aan: jallib <[email protected]> Onderwerp: Re: [jallib] Re: Update SSD1306 library supporting bigger font Hello Rob, It seems that the memory is not completely erased by the clear_screen procedure. I made a work around that overwriting all 8 lines of text with spaces, so that the unwanted pixels disappear. Furthermore, I saw that only the 5x7 and the 6x8 fonts works, the larger one doesn't. It's hard not to be able to test with the right display, so for now I'm waiting to see what you can discover. Kind regards, Bill. On Tuesday, January 20, 2026 at 6:47:41 PM UTC+1 Rob CJ wrote: Hi Bill, Thanks for the info. I expect the LCD's to arrive soon so I can test it myself. Strange all those random pixels (I assume after clear display. It may be that the shift 1 pixel to the left may be caused by the fact that this controller support 132x64 while the SSD1306 supports 128x64 and I still used 128x64 in this library but I will test that too. I head something similar from Rob Hamerling to add an offset. I noticed when testing the SSD1306 library that some scrolling funtionality only worked for the version with SPI and not IIC. I do not know why that is. As soon as I get it all working I will send you an update. Kind regards, Rob ________________________________ Van: [email protected] <[email protected]> namens Bill Beek <[email protected]> Verzonden: dinsdag 20 januari 2026 16:37 Aan: jallib <[email protected]> Onderwerp: Re: [jallib] Re: Update SSD1306 library supporting bigger font I meant Horizontal and diagonal scrolling. On Tuesday, January 20, 2026 at 4:33:27 PM UTC+1 Bill Beek wrote: Hi Rob, You're on the right track, that addressing also gave me some problems to figure out. I'll send some pictures so you can see what's happening on the display. The "8" at the bottom left has been moved 1 position so that the full character is visible. That is not a big problem. Only the vertical scrolling functions work, the horizontal and vertical ones don't. And of course the unwanted pixels are the problem as far as I've been able to discover, as you can see in the pictures. Kind regards, Bill. On Monday, January 19, 2026 at 6:58:17 PM UTC+1 Rob CJ wrote: Hi Bill, I had a detailed look at the datasheet of the SH1106 and saw that setting the device on a certain position works differently so I changed that. This way of positioning the device uses a page addressing mode. This mode is also available in the SSD1306 but there the library uses horizontal addressing mode and so a different method is used. You can also select the page addressing mode on the SSD1306 and then the same approach is used as in the SH1106. Not sure if this solves all problems but this version will not work on the SSD1306 since the command to select the addressing mode is not present in the SH1106 so I removed that command in total to prevent any side effects. In the future it might be possible to make one library for both (maybe with a 'define') but maybe it is better to keep them separate otherwise the library name should change to glcd_ssd1306_sh1106. If this does not work then you have to wait until I can test it myself. Kind regards, Rob ________________________________ Van: [email protected] <[email protected]> namens Rob CJ <[email protected]> Verzonden: zondag 18 januari 2026 16:28 Aan: [email protected] <[email protected]> Onderwerp: Re: [jallib] Re: Update SSD1306 library supporting bigger font Hi Bill, OK. These where settings that supposed to work for both. I will do some more research and will test it first myself before sending an update. Kind regards, Rob ________________________________ Van: [email protected] <[email protected]> namens Bill Beek <[email protected]> Verzonden: zondag 18 januari 2026 16:15 Aan: jallib <[email protected]> Onderwerp: Re: [jallib] Re: Update SSD1306 library supporting bigger font The latest lib make it worst, both displays are now up side down. And the 1306 is now messy and the 1106 behavior is further unchanged. Kind regards, Bill. On Sunday, January 18, 2026 at 3:45:30 PM UTC+1 Bill Beek wrote: Hi Rob, Only for the video together, when used separately the same results on the display On Sunday, January 18, 2026 at 3:21:23 PM UTC+1 Rob CJ wrote: Hi Bill, Are you using both at the same time on the same IIC bus with the same IIC address? That may give problems. I updated the library and used other initialization settings that I received from the other Rob. They should work both for the ssd1306 as well as for the sh1106. Kind regards, Rob ________________________________ Van: [email protected] <[email protected]> namens Bill Beek <[email protected]> Verzonden: zondag 18 januari 2026 12:41 Aan: jallib <[email protected]> Onderwerp: Re: [jallib] Re: Update SSD1306 library supporting bigger font my mistake -- You received this message because you are subscribed to the Google Groups "jallib" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/jallib/c6d86474-5d12-4826-b55a-a4c2d74f2e69n%40googlegroups.com<https://groups.google.com/d/msgid/jallib/c6d86474-5d12-4826-b55a-a4c2d74f2e69n%40googlegroups.com?utm_medium=email&utm_source=footer>. -- You received this message because you are subscribed to the Google Groups "jallib" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. 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