1. Introduction
Besides offering STMicroelectronics’s USB stack, USBX, the Azure RTOS USB embedded stack, is currently supported and offered with a set of applications on STM32 MCUs.
The USB Overview is a dedicated wiki page that was implemented to provide a general overview of the Universal Serial Bus and its main features.
USBX is the Azure RTOS USB Host and USB Device embedded stack. It is tightly coupled with ThreadX. For some classes, it requires the FileX and NetXDuo stacks. It allows to work with USB devices with multiple configurations, composite devices, USB OTG and supports the USB power management.
USBX provides both USB Host and USB Device stack with a large set of the USB classes. The modular architecture makes the porting on different USB hardware IPs easier as soon as the low-level driver can answer the USBX requests. In the STM32 context, the USB IPs either host or device, vary from a family to another. Even though all IP should be supported transparently by the USBX thanks to the common STM32 HAL driver API.
USBX provides all common USB features and classes. The following figure provides the list of currently supported classes:
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