AnsweredAssumed Answered

K81 execution fails with UART attached

Question asked by Denis Collis on Sep 10, 2018
Latest reply on Sep 20, 2018 by Kerry Zhou

My K81 project firmware communicates to a PC-hosted application via LPUART2 through an FTDI USB-to-Serial_TTL cable.

If I run in debug - i.e. Segger J-Link attached and under control of MCUXpresso's debug environment - with or without the serial cable attached, then everything works.

If I reset the K81 board with the serial cable DETACHED, then everything works.  If I attach the serial cable while the board is running, then everything continues to work.

But...   ...If I reset the K81 board with the serial cable ATTACHED, the K81 is usually unresponsive, but occasionally works.

Note: No semi-hosting (using libcr_nohost_nf.a) 

Any ideas on how to track and solve this problem?