About JLHK01

JLHK01 · 2024-10-30

Hi all,Total newbie here.I am seeing this error in Windows 11 Device Manager: "Device Descriptor Request Failed", when I plug the Bluepill to a PC using Bluepill's onboard micro-USB PortAlthough the Bluepill looks like it is running OK with the previ...

JLHK01 · 2024-11-04

gbm,Thanks for your input.You wrote: "then switch USB on after about 50 ms - this allows for proper re-enumeration after reset or app/bootloader switch."How can one go about doing this, via some code at the beginning of main.c ? If so, can you give ...

JLHK01 · 2024-11-04

Thomas,Thanks for your answer. Is there any CDC example codes (any URLs are great) that I can download and try ?

JLHK01 · 2024-11-01

Thanks Thomas for your reply and further info.Sorry that I am asking newbie/ignorant questions as I am indeed a newbie in microcontroller. When you referring to "firmware" in "PA12 is low no USB firmware can work" and "write a USB firmware", are you ...

JLHK01 · 2024-10-31

Sorry that I don't quite understand when you say "before you want to use USB" ?Do you mean reverting the "set PA12 low" change ? If so, you mean using reusing PA12 as USB Data ?

JLHK01 · 2024-10-31

Thanks Thomas, the code appear to work with just the bluepill onboard usb connected to PC giving no Windows error (initial problem).Sorry that I don't quite understand when you say "before you want to use USB" ?Ain't I already using USB to supply pow...

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STM32F103C8T6 Bluepill giving Windows "Device Descriptor Request Failed"

Re: STM32F103C8T6 Bluepill giving Windows "Device Descriptor Request Failed"

Re: STM32F103C8T6 Bluepill giving Windows "Device Descriptor Request Failed"

Re: STM32F103C8T6 Bluepill giving Windows "Device Descriptor Request Failed"

Re: STM32F103C8T6 Bluepill giving Windows "Device Descriptor Request Failed"

Re: STM32F103C8T6 Bluepill giving Windows "Device Descriptor Request Failed"