Hi,
It depends on which driver you use. The USBv1 driver should pose no problems, the OTGv1 driver requires to execute a function as a thread, without an RTOS your main has to execute this function and your application could only use USB callbacks for other processing.
Giovanni
HAL demo without RTOS
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Giovanni
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Re: HAL demo without RTOS
I use STM32F401. So I need use OTGv1. I'll look it up in the source code . Thanks.