Important changes to forums and questions

All forums and questions are now archived. To start a new conversation or read the latest updates go to forums.mbed.com.

Baudrate on the PC - USB-serial interface

Topic last updated 31 Jan 2010, by Anders Rundgren. 2 replies
Anders Rundgren
31 Jan 2010

Shouldn't baudrate actually be set by the host?  That is (AFAICT) how it is done in stand-alone USB-RS232 converters.

I guess this is already done in the control-chip but it doesn't propagate to the MCU?

Igor Skochinsky
31 Jan 2010

Baudrate should be set to the same value both on host and MCU. If they don't match, you get garbage.

Anders Rundgren
31 Jan 2010

"Baudrate should be set to the same value both on host and MCU. If they don't match, you get garbage"

Yes, but the garbage is created between the LPC1768 and the MBED controller chip since only the latter acts (?) on the baudrate setting message that I believe is sent from the host as a part of the USB serial (ACM?) protocol.

It is not a bug, it is simple an area that could be improved to make communication a bit more flexible.

Anders