CC3230SF: No UART Output on CC3220SF Eval Board

Tool/software:

Hi all,

I’m working with the CC3220SF eval board and I’ve run into a problem with my serial console output. Here’s my setup:

• Green box: JTAG connection to the debugger

• Red box: SOP‑jumper configuration (to enable UART console)

• Blue box: RX/TX pins routed from the CC3220SF to my external board

• Yellow boxes: Jumpers supplying USB power

I loaded the “power measurement” example from the SimpleLink SDK into the MCU successfully. When I open PuTTY (115200 baud, 8 N 1, no flow control) I do not see the console banner and debug messages, even though the application is still running (I can confirm via the debugger). 

What I’ve checked so far

• Verified SOP jumpers are set for UART console (and reflashed to be sure)

• Measured USB power rails at 3.3 V—stable under load

• Confirmed RX/TX wiring continuity between CC3220SF and external board

• Tried different USB cables and PC USB ports

• Ensured PuTTY settings (baud, parity, data bits) exactly match the SDK example

We have seven CC3220SF evaluation boards, but only one of them produces console output despite using the exact same setup on all units.

Any advice on how to get the console output would be greatly appreciated!

Thanks