About AHugh.2

AHugh.2 · 2024-01-21

Hi,The STM32U5 has a password feature to restrict RDP regression from level 1 to level 0. However it seems that STM32CubeProgrammer CLI is unable to activate this via the USB interface of the built-in bootloader. If I do it via STLink then it works f...

AHugh.2 · 2023-09-27

Hi,I'm trying to resolve a issue I see occasionnaly where my USB CDC-ACM device fails to be detected by Windows/Linux host as it is not responding to the first device descriptor request until the system is fully reset.The scenario:STM32U575 (can repr...

AHugh.2 · 2023-06-12

I'm debugging an issue where my application is using device mode USB with CDC-ACM and when I come to transmit a data packet on a bulk IN endpoint that is either 64 or 128 bytes in length, the data is not received by the host until either a different ...

AHugh.2 · 2024-11-21

Having a timeout to handle exact multiples of endpoint size seems a bit of a kludge and not really suited to a high throughput or low latency scenario.

AHugh.2 · 2024-11-21

Yes, and from the device's point of view this is exactly what happens on tx - the USB device stack is configured to send ZLP when required and the host is happy.The problem I'm having is on receive of data from the host (being a Windows or linux PC),...

AHugh.2 · 2024-11-21

Thanks for the reply and sorry for the late response. I'm not so keen on doing the same workaround you have as my requirement is quite high performance. It does seem like a weakness in the ST HAL layer and I guess other USB CDC-ACM stacks build upon ...

AHugh.2 · 2024-11-05

Hi, did you get any resolution to this problem?I'm seeing the same thing - host PC sends 64 bytes and the USBX stack doesn't respond, whereas 63/65 bytes is fine. From what I see too, the ST/USBX stack is expecting more data or a ZLP but neither the ...

AHugh.2 · 2023-06-12

Thanks. If you look at the equivalent example for the Nucleo-U575 (which is what I based my code on) the UX_DEVICE_CLASS_CDC_ACM_WRITE_AUTO_ZLP macro is commented out. Might be worth updating the example.https://github.com/STMicroelectronics/STM32Cub...

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Unable to set STM32U5 RDP password via USB interface

STM32U5 USB CDC-ACM device gets into state where it fails to respond to device descriptor request

STM32U5 USB (CDC) not transmitting data if in exact multiple of 64 bytes

Re: USBX CDC ACM data read bug?

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Re: STM32U5 USB (CDC) not transmitting data if in exact multiple of 64 bytes