USB CDC Device_Only, re-connect port

[tan loi]

Posted on November 04, 2017 at 19:46

I'm using STM32F407 Discovery-1, I use USB CDC to send and receive data from terminal. Everything ok but issue that I need re-connect port to transmit and receive data, but i remember that when i used 

STM32F407 Discovery , every when i upload new code, i don't need to re-connect port. I use CubeMx 4.14 for both STM32F407 Discovery versions. Please help me to resolve this problem. Sorry for bad my english.

[Imen.D]

Posted on November 06, 2017 at 12:25

Hello

thaitanloi365

,

Please use the last version of CubeMx 4.23 and firmware package STM32CubeF4.

Have a look to the CDC application from CubeF4 package and you canstart with a working USB example to identify what is going wrong in your case and confirm if the problem here seems related to the hardware or software environment.

Best Regards

Imen

[tan loi]

Posted on November 06, 2017 at 14:27

Thanks for your recommendation, I have used other versions as CubeMx 4.19,4.22 and 4.22.1 and other firmware versions as V2.J28.M18 Debug +Mass storage and latest firmware version, but the problem isn't resolved. I had to re-connect port every i upload new code. I confirm that when i use this code for STM32F407

Discovery 

( not Discovery 1 ' with firmware  ST-LINK V2 Debug. This problem is fiexed.