USB CDC Port Not Shown In Device Manager(MCU STM32F!103RET6)

[Smit Italiya]

Hello Everyone,

Right now i am facing the issue on detection USB.I am attaching snap shots of the my USB configuration.

USB port not shown after powering up the board. i am doing some basic thing like on receiving via USB in RX interrupt function of USB i set one flag that will used in main function for further process.

Help Me if anyone knows the issue, i stuck here since 2 days.

STMCubeIDE Version:- 1.13.2

MCU:- STM32F103RET6

Debugger:- Jlink(4000Khz)

USB DP:- PA12

USB DM :-PA11

Internal Power Supply used which is given to MCU and other board peripheral.

[gbm]

Check the USB cable and the operation/frequency of quartz oscillator. Some versions of USB stack may require increased stack or heap size - set both to 2048 just in case. And, as I wrote many times in the past, calling USB Transmit from the main loop will sooner or later hang the USB stack, but it's another story - deal with it after the device is detected.

[Smit Italiya]

Hi gbm,

thank you for response ,As you suggest me i check the oscillator frequency and it is 16mhz. i will let you know after changing heap and stack size to 2048.

any thing else you know about this?

[Smit Italiya]

No detection despite of changing the buffer size to 2048 Bytes

[gbm]

So maybe you should use The Force... I mean the debugger. Comment out your ecu-related calls, leaving only USB initialization, then check what happens.

My wild guess: continuous ADC conversion causes continuous ADC interrupts consuming all the CPU time with no time left for any other processing.

[Piranha]

One cannot just call functions like CDC_Transmit_FS() from this USB stack:

https://community.st.com/t5/stm32-mcus-embedded-software/32f417-can-one-detect-when-a-usb-host-is-connected/m-p/601826/highlight/true#M42845

[Smit Italiya]

Thanks gbm ,i tried by creating test project in which i run USB only and find the same as before. other then that i have same project with stm32f0 series there USB works fine.is there any issue with the stm32 SDK?

[Smit Italiya]

can you explain me more about what your point of view because i am not able to understand properly i am slightly new to USB

[gbm]

Increase the stack and heap size in CubeMX project settings. The RX and TX buffer size settings in CubeMX are pure nonsense - only 64 bytes of RX buffer are ever used and the TX buffer is not used at all.

[AScha.3]

is there a 1k5 pullup on usb DP ?  ( otherwise no enumeration starting...)