CCS/TMS320F28377D: SCI communication issue - Unrecognized characters on the hyperterminal

Check your baud rate. 

1. Put a scope probe on the transmit line.

2. Find the smallest pulse.

3. Measure the width of the smallest pulse.

4. The inverse of the width is your baud rate.  For example, if your smallest pulse is 10.4uS, then you have 9600 baud. ( 1 / 10.4uS = 96154)

Remember that your actual baud rate must be within 3% of the ideal baud rate.  So if the transmitted signal's measured baud was actually 9900 baud, it will not work with a 9600 baud receiver.

Hi Devin,

Thank you for the reply.

Below set of activities i could confirm,

1. Measured baud rate on the scope and it matches with my SCI configuration.

2. Bit pattern on the scope is matching with the data that has been transmitted. 

3. FTDI virtual com port does read the data that i have transmitted.

I am trying to read through the com port of my PC. I am using the RS232 serial transceiver (see link below)

https://www.insight.com/en_US/buy/product/ICUSB2321X/STARTECH.COM/ICUSB2321X/StarTechcom-1-Port-Professional-USB-to-Serial-Adapter-Cable-with-COM-Retention--serial-adapter/

On the docking station [R4.1] , i have connected pin 78(GPIO29, SCITXA) to the RS232 receiver pin.  Connected the ground pin of docking station and RS232 transceiver to make sure the common ground

I could see random characters received on my PC com port. 

I have experimented this with TTL to USB converter and still see random characters on the PC com port.

Did i miss any setting on the controller card to rout the SCI signal to the docking station pin (76 and 78).

Please help to resolve this issue.

Thanks & Regards,

Munaf