I’ve worked with the T113‑S3 a couple of times, and I remember having the exact same struggle when switching from KEIL/IAR + FreeRTOS to RT‑Thread Studio. The workflow feels very different at first, especially because RT‑Thread Studio is Eclipse‑based and the Allwinner ecosystem isn’t as polished as STM32 or NXP. Here’s what I’ve learned that should help you get started.
https://docs.google.com/document/d/1XpeiJUbYCz_Y3tEMg6bj5P6xA1I8NIYa/edit?usp=sharing&ouid=109133764362619513557&rtpof=true&sd=true melon playground