Briefing
The post's other cases: GPIO23, 24, 25 and 29 on a Raspberry Pi Pico exist in code but not on the 40-pin header, and an STM32F411 clocked at 100 MHz instead of 96 MHz loses USB. The author says the ST7789 detail sat in the vendor's wiki, not in any tutorial.
Each mcu-skills entry has an always-loaded summary with the pin map, reference files loaded on demand, and a template project that builds and flashes. The post suggests copying a skill into the firmware project and adding the project's own pin, timer and DMA assignments, where every new session reads them.
The examples come from the author's own boards and are described in text, with no captures.
Written by the Boards & Bots curator