Other Parts Discussed in Thread: MSP430FR5969
I'm testing Spy-Bi-Wire and UART functionality between the MSP-FET and an MSP430FR5969. In order to isolate these components, I've attached jumper wires between the relevant pins on the MSP-FET and the pins that are normally jumper-ed together to connect the ez-FET to the MSP430.
Below is a pinout of the MSP-FET taken from slau647m and a picture of the MSP430FR5969 launchpad:
Spy-Bi-Wire
I've connected the relevant pins (shown in green) and I'm able to program the MSP consistently.
UART
The UART connection is shown in red. After wiring everything up I was able to echo characters with the example code provided. However, after disconnecting the MSP-FET and plugging it back in, I can still program the MSP but the UART is totally unable to send characters to the MSP. I used an o-scope to verify that the MSP-FET isn't sending anything. Closing/opening the serial terminal and CCS do nothing. No amount of power cycling the MSP-FET restores the ability to send characters. The only thing I've found to fix this is a PC reboot.
Is there any way to fix/prevent this?