#usb

Zephyr RTOS BringUp on stm32

Published at May 7, 2021 ·  7 min read

The Zephyr RTOS is one of the best around. It makes me feel like working on embedded Linux in the sense of device integration, code styling, device tree (DTS), CMake build systems and more. It has many build-in stacks for USB, networking, BLE, file system, boot loader, DFU, and more. Its API reaches and has partial POSIX support with a custom build system that makes tiny footprints. This post is a tutorial on bringing up for STM32 board with USB and USART interfaces....

Linux Gadget Device.

Published at January 19, 2021 ·  4 min read

This post is an example of making a USB device from a Linux embedded machine where any HOST can control it. From Linux documention: Most Linux developers will not be able to use this API since they have USB host hardware in a PC, workstation, or server. Linux users with embedded systems are more likely to have USB peripheral hardware. To distinguish drivers running inside such hardware from the more familiar Linux “USB device drivers,” which are host-side proxies for the real USB devices, a different term is used: the drivers inside the peripherals are “USB gadget drivers....