Ask questions and find answers on STM32Cube packages, including HAL, LL and middleware, and expansion software.
Dear Customer SupportI'm using the USB CDC class (Virtual COM Port) on STM32H7.When I unplug and plug the USB cable during comport communication, occasionally, the device manager display shows "Unknown USB device (device descriptor request failed)".I...
Hi,I want to use my own custom usb device class base on usb core provided by ST. Inspecting the code, I found that "DataIn" and "DataOut" callback functions provided by the class to usb core are called at the END of the data in or out stage... Callin...
My program has the option of sleeping for a period using the RTC to wake or sleeping until the wakeup pin is set high. Both these functions work perfectly if I talk to the outside world using a uart.However, I configure CDC as a serial port SLEEP doe...
Hi,I am trying to understand the interrupt vectors for the USB interrupts for the STM32G4. In the reference manual (RM0440) it shows that there is a USB_HP and USB_LP interrupt. However, I cannot find any mention in the USB interface description that...
Hello everyone here, I have a STM32L43x µC and I wish to read the Memory size when I am in Bootloader mode. I tried using the function Read Memory command to read the register at address (Base address: 0x1FFF 75E0) which contains the Memory size. Unf...
Hello community,I'm currently having issues or perhaps not fully understanding the procedure of writing data to the MCU bank 2 and then switching to this bank to run the program from bank 2.My setup for now is using a custom protocol for sending the ...
I have VBUS sensing enabled and when I step through the call to HAL_PWREx_EnableUSBVoltageDetector(), you'd expect a difference in the bit states in the OTG_HS_GCCFG register but there is no difference whether the cable is plugged in or not.I find it...
I wanted to implement a simple USB device only on a STM32F407. When I enable it in CubeMX under USB_OTG_FS I get a DP and DM line and there is an option to activate the VBUS line. Is activate VBUS absolutely necessary? It is after a simple device onl...
Hello,When I try to Enable Ineternal DMA Option , Winodws gives "USB Device not recognized message"I am using Winodws 10 and every thing works fine if I disable this optionHow I can use this option?and could it offload the controller?Best RegardsHoss...
With the USB sample code that I have, I get the following error:"device descriptor request failed" The heap size = 0x1000, so I do not think that is the issue and I do not see any bug in the code.
