![stm32 driver naze stm32 driver naze](https://i0.wp.com/www.blog.jay-greco.com/wp/wp-content/uploads/2016/05/stm.png)
This allows crystal-less USB operation! Very cool.
![stm32 driver naze stm32 driver naze](https://www.dronetrest.com/uploads/db5290/703/e01994a4576fecd3.jpg)
On the STM32L052, one of the really cool things about this is that it is able to use the internal oscillator to generate a proper 48MHz USB clock by locking to the Start of Frame handshake from the host.
#Stm32 driver naze how to#
My intent here is to show how to interact with the STM32 USB peripheral and one way to get started writing your own HAL around it, rather than relying on others’ software. In fact, I believe some of it might be wrong (specifically my treatment of the PMA on the STM32L052). My objective here is to walk quickly through the operation of the USB Peripheral, specifically the Packet Memory Area, then talk a bit about how the USB Peripheral does transfers, and move on to how I structured my code to abstract the USB packetizing logic away from the application. (mainly in common/src/usb.c and common/include/usb.h)
![stm32 driver naze stm32 driver naze](http://img.hifpv.com/images/201512/1450249173400042443.images.1000x1000.jpg)
Example code for this post can be found here: