The structure of the stm32 usb device library feels very complex, is there any tutorial to clarify the structure?I want to implement a UVC.This is a picture I found on a wiki, but I can't make sense of it.For example, the file stm32xxx_ll_usb has no ...

stm32h7xx_hal_uart.c is missing a prompt to enable usart interrupt in the DMA configuration instructions.Other comments have this sentence:(+++) Configure the USARTx interrupt priority and enable the NVIC USART IRQ handle(used for last byte sending c...

With DCMI (with DMA) and USART only 1.5FPS, why is the frame rate really low? The output is set to QVGA and formatted as JPEG.  

I have used software control GPIO simulate parallel interface to successfully receive data, but how to faster, I used timer to trigger DMA, but the effect is very bad.stm32f1_ov2640_tim_dma_uart About: 1-1.5 FPS