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STM32H7 USB_OTG_HS internal DMA not working

P.R.
Associate II

Hey,

I am trying to get the internal DMA of my USB HS interface to work. I am using an USB3320 as my ULPI transceiver connected as Device. I have no trouble using the USB interface without the internal DMA, however, it is extremely slow. I only get about 50 KB/s, using CDC_Transmit();. I am hoping to get at least a few MB/s with the HS interface.

I am using CUBE and TrueStudio, all the code was created using CUBE. According to Wireshark setting up the Descriptor, Configuration and Line Coding works, however, when I am trying to open the COM port with putty/HTerm or RealTerm then the device doesn't respond/unable to open Serial port.

Any help would be greatly appreciated!

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