3.5 inch 320x480 IPS Capacitive Touch Screen LCD Module SPI Serial ST7796U Driver for Arduino R3/Mega2560

Using this on a teensy 4.1. Had a few problems at first: ST7796 driver didn't work, so used Arduino_ILI9341 - works fine! Runs up to 110mhz spi on my teensy with good clean soldering and short cables. FT6336U didn't work at first - bad driver code from github (aselectroworks/Arduino-FT6336U - don't use this doesn't work - has a 10ms delay in the readbyte code e.t.c. lol), so cobbled together my own from github "strange-v/FT6X36" driver. Had trouble with that as well - had to delay 300ms on power up before using the FT - else it would't init at all. Also had problems with the FT cutting out while SPI display was updating - All these problems were caused because my CPT reset pin wasn't being used - did not connect it and so it was floating and SPI triggered it - just tie it to VCC if not using it. You can also tie the LCD reset to GND and CS to VCC with a 4.7k resistor if your only using 1 display. Now everything is working great - it's a great display with a nice slick and easy CPT touch interface! With LVGL I get 30fps no problem without using the fast t4 code library.