Data Corruption with USB CDC communication

[Aishwarya]

Continuous transmission of data of tx rate 500 samples per seconds(33 bytes per sample) using USB virtual com port(USB CDC).

USB mode - full speed

Transmit data to serial monitor using function CDC_Transmit_FS();

Received data on serial monitor is corrupted data, and this data corruption is not regular.

To solve this problem -

• check the status of CDC_Transmit_FS() who check the state of variable(hcdc->TxState )
• send data after multiples of 1millisecond window.
• Set/reset flag continuous in CDC_TransmitCplt_FS() function.

[James Murray]

Not sure if this helps, but see https://community.st.com/s/question/0D50X00009XkhXw/usb-cdc-device-receive-fails-on-transmit

James

[Aishwarya]

hi @James Murray​ 

Problem is, data get corrupted when high speed data(16500 Bytes per second) transmission takes place.