teensy fast tft display pricelist

This 320x240 color TFT display is recommended for use with Teensy 3.2 to Teensy 4.1, for high resolution color graphics.It can be used with the Adafruit_ILI9341 library or Optimized ILI9341 library.

CC3000 is troublesome, partly because it uses SPI_MODE1, partly because it uses the SPI port from within an interrupt. Adafruit’s CC3000 library has code to backup the AVR’s SPI registers, change them to MODE1, and then restore when it’s done, so the conflicting clock polarity isn’t (usually) an issue on AVR. But on Due, Teensy 3.1 and all other non-AVR chips, their specific SPI registers aren’t also in the code, so you can pretty easily end up with the SPI port left in the wrong mode.

Interrupts are also a huge problem. Using the CC3000 in simple blocking ways, where you fully complete all communication before you try to write to the display or read the touch screen or access the SD card tends to work. But if you use another device while the CC3000 generates an interrupt at just the wrong moment, it can run its SPI code while another device has chip select asserted, causing all sorts of terribly wrong results.

The touch controller on Adafruit’s displays comes in a couple different types, which need different SPI data modes, and some require very slow clock speeds. Again, they have AVR-only register save/restore, so usually you don’t get wrong settings into other libraries, but there’s no hardware specific code in those libs for non-AVR chips.

My recent work on SPI transactions, which will be in Teensyduino 1.20 (already in the latest release candidate and on github) and is planned for Arduino 1.5.8 (already in their github source and nightly builds) aims to solve both the settings and interrupt problems, in a hardware independent way. Adafruit has already merged my patches to their libs, at least for these most common ones, so they use the new SPI transaction stuff when compiled on those new versions.

This library supports ST7735 and ST7789 with and without a CS pin, such as https://www.amazon.com/gp/product/B07P9X3L7M/?pldnSite=1 which is a ST7789 240x240 display.

NOTE: If the Teensy has more than one SPI buss. And the IO pins are all on a different SPI buss then that buss will be used. (i.e. you can use SPI1 or SPI2). With this, on a board such as a T4 or T3.5 or T3.6 you can potentially have three displays all on different SPI busses and using the Async updates you can have all three of them updating their display at the same time.

The teensy 4.x, 3.6 and 3.5 have a lot more memory than previous Teensy processors, so on these boards, we borrowed some ideas from the ILI9341_t3DMA library and added code to be able to use a logical Frame Buffer.

Since the smaller ST7735 and maybe ST7789 displays have fewer pixels, you can on some of them enable a frame buffer on a T3.2 as well. I believe in this case I did add support for Async updates as well.

This TFT display is big (2.8 diagonal) bright and colorful! 240x320 pixels with individual RGB pixel control, this has way more resolution than a black and white 12864 display. It Works well with Arduino and other micro-controller boards.

As a bonus, this display has a resistive touchscreen attached to it already, so you can detect finger presses anywhere on the screen. This display has a controller built into it with RAM buffering so that almost no work is done by the microcontroller.

The display can be used in two modes: 8-bit and SPI. For 8-bit mode, you"ll need 8 digital data lines and 4 or 5 digital control lines to read and write to the display (12 lines total). SPI mode requires only 5 pins total (SPI data in, data out, clock, select, and d/c) but is slower than the 8-bit mode. In addition, 4 pins are required for the touchscreen (2 digital, 2 analogs).

This 2.8 inch SPI Touch Screen Module is wrapped up into an easy-to-use breakout board, with SPI connections on one end and 8-bit on the other. Both are 3-5V compliant with high-speed level shifters so you can use with any microcontroller. If you"re going with SPI mode, you can also take advantage of the onboard Micro SD card socket to display images.

I think that"s reasonable cost-wise for my purposes (I"m making a status display to go inside my white-build gaming "rig" to look shiny). Red takes about 12 seconds to refresh, AFAICT I should be able to get sub-1s black updates. You can get 7-color versions for about the same price but the refresh on those is very slow.

As ever it depends what you want to do - If you want a 2-inch tri-color display, in a format where you can attach SPI wires easily, you might get away with $20 AUD. You can find small greyscale eink displays very cheap (sub-$1) like this - https://www.aliexpress.com/item/1005003555154992.html

If you want full-color, fast-update e-ink/epaper, that"s just filtering into the market AFAICT, and it"s much more pricey. I can find a 31.5 inch full-color epaper display for about $2200(US)!

Meanwhile the Pico is just a regular old MCU. It doesn"t have anything that you would associate with a home computer, no keyboard, no way to connect a display, no swappable storage, can"t be it"s own development platform, etc. It"s not something you"d ever want to have as your first computer. You need a real computer to even get any use out of it.

Secondly, I think the Pi Pico W - which can drive a display using one of the cores (see link) - has the potential to be the basis of a system close to what you describe.

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