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Linarism, that looks fantastic! I at least would be interested in using something like that in a project - but I have to admit my time for projects has been very little lately. I never got anything that fully fleshed out working on the RA8875, but I did use it for a very minimalistic UI and...

I think it would be really interesting to explore this idea but I don't know enough about the low level mechanics to know if it's feasible. I think though if you had two framebuffers both dedicated to one screen then you might be able to do a comparison of the two and only send pixel data for...

I learned about the Teensy after the 3.2 was released and I loved the hardware, platform, and community. So when the 3.5/3.6 Kickstarter happened I jumped on it and I was thrilled with how PJRC managed it and delivered early - very uncommon for Kickstarters in my experience. But I have to say...

I'm not sure I remember enough to ask an intelligent question, but here goes. I am trying to dig up an old project of mine that used the ILI9341_t3DMA library that was really a proof of concept at the time I implemented it. However, as I recall, it was the only one at the time that was using the...

I'm no expert in this area, but I see this used a lot for sharing 3D models in the 3D printing communities: https://creativecommons.org/licenses/by-nc/3.0/

I really wouldn't expect to notice a difference between 22Mhz and 18Mhz with this display. From poking through the library and documentation, it seems some (many?) of the calls are limited to 10Mhz, which is taken care of by the library automatically. Anything that isn't limited is allowed to go...

I think you should try connecting it. It seemed to be required in practice on my hardware. Also, a note for later on - I had to lower the SPI_MAX_SPEED (can't check the actual define name right now but that should be enough to find it) in order to work on my 3.6. 22MHz that was defined for the...

BuDisplay is only talking about powering the board when they differentiate between 5V and 3.3V. Get whichever is more convenient to power. The signal levels are 3.3V for all. There is an issue on the RA8875 wiki and issue list about the 5v not being option for the 5" because of a missing...

That would be awesome. I'm still hoping someone will create something along these lines for the pi zero (something like an open source and highly capable version of what companies like Nextion or 4G Systems are doing) - if the availability ever gets reasonable the price is hard to beat! But...

I don't believe that's possible yet. If/when it is I'd jump on it too because it would make things easier on my current project.

Thanks for the suggestion. I suspected that too and there was actually an issue where all the conditions should have been met to enable RF24_SPI_TRANSACTIONS but it wasn't enabled. I fixed that and the issue persists, but it probably isn't related to this library though because it shows up under...

I finally found a breadcrumb to an issue that's been annoying me for days, but I don't understand it at all. Radio data on the SPI bus is corrupted if I ever call tft.refresh() or tft.refreshOnce() inside a sketch that also uses this RF24 library: https://github.com/TMRh20/RF24 This occurs...

I don't think it's a hardware issue because I'm using the base _t3 library, your variant, and frank's variant all on the same hardware for different testing. But yeah, I think I'll just have to track it down at this point because there's too much involved to expect anyone to replicate what I've...

Kurt, thanks for updating the function to draw fonts using the frame buffer! It's so cool to play around with, but I just can't get it working in my program. I really wish I could narrow it down but I can't seem to reproduce it in an example sketch. Since I can't and I have very involved...

I've tried to start this a few times but I can't seem to figure it out. Do you have any suggestions on how to accomplish a similar rotation(3) simulating hack that would use Frank's converted fonts from here: https://github.com/FrankBoesing/fonts/tree/master/ofl

I discarded the test, but it was basically this, which uses a font file from here: #include <SPIN.h> #include "SPI.h" #include "ILI9341_t3n.h" #include <font_Inconsolata-Regular.h> //from linked library but pointing back to the ili9341_t3n instead of the regular ili9341_t3 #define TFT_DC 15...

I'm following the thread at least, so you're not talking to yourself! I haven't had enough time to really be productive in the conversation unfortunately. I tested the font again and still no luck but I haven't looked closely enough at what's going on. The included font files have to be modified...

Yeah, I noticed that on the graphic test. I think I got it set up right though because before I tested the font it worked fine. I'm using the same font file with the regular _t3 library, and it works. However, I was using 8 point with your library to try and avoid making any other changes and I...

Thanks for the response. I tried it last night, but just with the graphictest as a quick test. The imported font rendered some garbage on the screen and almost seemed to ignore setCursor. I'll play around with it more when I get a chance. If I find anything that I can fix myself I'll try to see...

I'll definitely give it try as soon as get a chance. Out of curiousity, does this handle the additional high res fonts that can be used with the ili9341_t3?

Looks like I was too late!

I could never get refreshOnce() to work fully. It wouldn't cause my program to hang but it somehow caused color and position corruption of the frame buffer's data. However, note my unusual usage in my long post above. Either way, I wrote a simple refreshOnce() derivative in my sketch that works...

I would love to contribute but so far I haven't been able to figure out anything helpful, hah. I'm nearly a beginner - one of the quintessential MIDI controller builders. I probably shouldn't have started with rotation though based on your comments... I'm in the same boat, the rest of my...

I'm assuming based on your comments about alpha-blending and antialiased fonts that this is planned to support the higher res fonts that Paul added a while back for the ili9341_t3 library, or even the google fonts? I don't mean to make it sound like I'm making any demands on your generosity, I'm...

Thanks for sharing this awesome work! I've been watching it but I just now got the opportunity to try it out. I have very long wire lengths so I was not really planning on trying it, but I couldn't stop wondering if it would work. So yesterday I opened up my enclosure of my 3.2-based project...

Ah, sorry! I've only used 4 wire SPI devices so I won't be any help. Was hoping for an easy solution!

It looks like you don't have MISO connected on pin 12? Or at all? I haven't used this library or that exact display to my knowledge, but I'm assuming that's required?

Thanks Paul! I may still try a version with the slower 74HC while I wait on the 74LCX chips to come in. I'm not sure how to handle the MISO with something of comparable speed. This is the critical one too in terms of pulling double-duty when it comes to dealing with devices that don't tri-state...

I had a question earlier this year about how to use more SPI devices than we have chip select pins on the Teensy. I got several different great answers that helped me along. I have found the first way I tried just doesn't work very well because of issues with bus length, probably too much...

The MIDI DIN you are asking about is done with this library: https://www.pjrc.com/teensy/td_libs_MIDI.html It is very easy to use and can work alongside the usb MIDI. As far as the LC vs the 3.2, it looks to me like you'd be fine with the LC based on the pin count, but you are using most of...

These are worth a look. http://www.takachi-enclosure.com/data/p_01plastic.html I haven't tried any of these in the link, but I recently bought a large aluminum enclosure from them for my project and it's beautiful. It might get cost prohibitive but they can also customize some or all of their...

Or "Teensy" in large print with an actual-size graphic of one of the boards.

I think it depends on the screen size you want, but if you're looking for 5 to 7 inch I think those are your best options along with sumotoy's excellent library. Last I looked the 5" and 7" use different capacitive touch controllers, the 7" being the more compact library that's included with...

I assume so. The segment display looks like it just directly controls the segments. The rotary encoder page you linked looks to be the same one that Paul links to on the bottom of his encoder library page. You can always install them and see if the example compiles for Teensy using the "verify"...

Very nice, and cool to meet a fellow SSO member here. I actually try to stay off the Luthiery section when I'm not able to build a guitar because it always makes me want to build so I missed your post over there. I have to think that if you've done this all once in another environment that...

Being new to this myself I'm not going to be able to give you as much insight as many, but just going through your list it all seems within the capability of the Teensy. I'm thinking in terms of the 3.2 because that's the one I've really started with and based my current project around but I...

Thanks for the new responses. Thank you Paul for posting on my question. Also thank you for making this all possible, what you are doing is incredible and I appreciate all your work! I'll play around with the different approaches but it's good to know it's possible so I can work on figuring...

Thanks, yeah I have been. All the libraries I'm using have implemented SPI transactions. I'm going to be getting one if each device type on a bus soon (3 types) to see if I can get them all working at once.

Thanks all for the information, I appreciate it! I did a test last night with 2 RA8875 displays sharing CS through the analog multiplexer and it worked really well. I like the idea of the I2C I/O expander to save ports and also because my I2C bus will be pretty sparse for this project so I can...

Hello all, I have been doing some digging on this topic with mixed results. I hope to have 16 SPI devices controlled by one Teensy 3.2. Initially I planned to use a 16 channel analog mux/demux to select between my devices (using 4 DIO pins to manually address the devices) and define CS to be...

I had been using 0.70b11 previously but tonight I installed 0.79b11 and saw the same slowdown you experienced. I removed ADAFRUIT_PHASE_FIXUP like you mentioned and the speed went back for me also. Now I just have to figure out why my RA8875 display slows down when it's on the same bus as an...

I had my own issue with the eastrising displays that I posted about here: https://forum.pjrc.com/threads/34425-Image-Noise-issue-with-RA8875-library During troubleshooting I thought for a long time it was wiring, because the issue looked to me like it might be a poor connection or bad power...

Manu, When using my eastrising boards without the 74hc125, I didn't have to desolder the pull-ups on the display. However I did have to avoid pin 13 since it already has a resistor for the led. Use an alternate pin for that functionality. I later desoldered the resistors and capacitors with no...

Success! I was on the right track before but I didn't realize 2 of the registers are stored elsewhere (the only ones that needed to change - values at position 0 and 1). BuyDisplay/EastRising must have made a recent change that hasn't yet been incorporated into Sumotoy's library. Here are the...

I'm not sure if this will help since it sounds like you are not using different hardware for your two library tests, but I observed that same low speed as in your video when I powered the 74HC125 with 3.3V. The speed went up to normal when I powered with 5V. My display is the ER-TFTM050-3 but...

Hello all, I'm pretty new to this area of interest but I'm having a lot of fun so far! I am trying to get my EastRising/BuyDisplay ER-TFTM050-3 display up and running but I'm having some trouble. I knew there would be some issues since I did some research before embarking on this adventure but...

First post here and on my phone so I won't be able to write example code. I think you're asking how to only write to an LCD when something changes? If so, you could have an if statement before writing anything to an LCD that checks a flag that gets set when you push a button (and subsequently...