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CCS/LAUNCHXL-F28027: interfacing serial port

Part Number: LAUNCHXL-F28027
Other Parts Discussed in Thread: TMS320F28027

Tool/software: Code Composer Studio

Hi,

I have C2000 LAUNCHXL TMS320F28027 and using the “as supplied” code sci_echoback with putty.

With Rx - Tx connection, identified com port etc. when we run the above code;

The Putty screen shows;

Hello World!

You will enter a character, and the DSP will echo it back!

Enter a character:                          

When we type in any character it should come back as echo from the LAUNCHXL board and display it.

However, in this case it seems the LAUNCHXL board does not echo it.

To check, if the LAUNCHXL board is receiving the character, connected CRO at the Rx pin, the CRO shows some pulse train.

Program counter (PC) hover around the instruction “while (SciRegs.SCIFFRX.bit.RXFFST !=1) {}”, indicating, Rx buffer is empty and not receiving anything.

Need your advice