XIAO with PWM and ST7789 display and being a glutton for failure

Products & Technology XIAO
#1

I’m trying to use XIAO as a portable precise pulse generator. I managed to get PWM configured and adjustable using potentiometers like in this sweeet video and now I need to add a screen.

I hope it’s not inappropriate to link to my post on the Arduino forum where I’m crying about not being able to get a Makerfocus (ST7789) 240x240 display working because I’m new and still working out where to ask who about what.

Either I damaged this screen, there’s some multiplexing issue, or it’s just me getting in my own way again. I’m not convinced it’s a conflict yet because I can’t even get the screen working by itself using the SDA/SCL or SCK/MOSI constructor for the Atafruit library.

There is no level shifter involved at this time since it’s all 3.3v. I need to eventually drive 5V but that’s later on.

I’m really liking D21 but the XIAO seemes more nuanced and maybe boutique. I’m looking for my people. Are you them?

#2

Sorry, we are not familiar with Makerfocus (ST7789). But if you can ensure that the hardware is connected correctly and the level is correct, it can be used normally.

#3

Have a look at bb_spi_lcd (BitBank SPI Color LCD/OLED library) by Larry Bank on github ( https://github.com/bitbank2/bb_spi_lcd). I used it to connect a 2" ILI9225 Color display with the XIAO using SPI and it appears to work quite well. The library supports the ST779 although I have no experience with that display.

On Sept 22, another question was posted about the ST7789: # XIAO Library Issue for TFT_eSIP with Arduino. Worth looking at I should think.

Good luck