About UMau.1

UMau.1 · 2020-09-17

I have to design a special USB <-> RS485 converter using an STM32F401.I realized the project at first with a STM32F4071G eval board with DMA supported USART functions and without RTOS using STM32Cube with FW-F4_V1.25.1 and all worked fine.After porti...

UMau.1 · 2020-08-31

Hi,I want to design a combined USB<->RS485 converter cable based on the CDC profile with integrated charger detection. The MCU of my choice is the STM32F401CB. The release of battery charge is done by switching an overcurrent protection chip TCKE805N...

UMau.1 · 2020-09-17

Thanks for your support.The problem was sitting at the keyboard.Porting the project from a completely different source file structure to the actual structure generated by CubeMX there arised two different UART-handles in two files where only one was ...

UMau.1 · 2020-09-17

@Community member I'm sure, that this was considered, the more so as the structure of the software was derived from a STM demo project and works fine on STM32F407.@TDKYes, and that's why I was so baffled about the occurence of this interrupt after t...

UMau.1 · 2020-09-03

Yes, in this trap I fell meanwhile too, trying to find a host rejecting my 500mA-request. Even simple bus powered USB-hubs, enumerated with 100mA MaxPower in the PC granted me the requested power of 500mA. So I've no chance at the moment to test the ...

UMau.1 · 2020-09-02

OK, it seems, that the handling of multiple configurations with low level functions has not to be done by myself: https://www.beyondlogic.org/usbnutshell/usb5.shtmlLike described, the client itself asks automatically for different configurations if t...

UMau.1 · 2020-09-01

Hi,thanks for your useful hints.I meanwhile found the function to initiate the soft reset with USBD_DeInit(pdev)and the access to the MaxPower entry within the configuration: *(USBD_CDC.GetFSConfigDescriptor(&length) + 8)for the following reinitialis...

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And again: Incorrect handled UART overrun error in stm32f4xx_hal_uart.c

How to repeat USB enumeration with a maxpower of 100mA if a previous 500mA request was rejected by the hub

Re: And again: Incorrect handled UART overrun error in stm32f4xx_hal_uart.c

Re: And again: Incorrect handled UART overrun error in stm32f4xx_hal_uart.c

Re: How to repeat USB enumeration with a maxpower of 100mA if a previous 500mA request was rejected by the hub

Re: How to repeat USB enumeration with a maxpower of 100mA if a previous 500mA request was rejected by the hub

Re: How to repeat USB enumeration with a maxpower of 100mA if a previous 500mA request was rejected by the hub