AnsweredAssumed Answered

How to start executing program on K64F right after power on

Question asked by Antonio Quevedo on Sep 13, 2015
Latest reply on Sep 25, 2015 by Leonardo Bueno



I am using a FRDM-K64F board in a project, and I am facing a problem. I want my board to start executing the program already flashed into the Targer CPU (K64) right after I power on the board. However, the program only starts after I press the RESET button. I am powering the board through a smartphone charger with micro USB plug, and I have tried both USB connectors (SDA and MCU). When I power the board with the SDA USB connector, I need to use RESET button, and when I power it with the K64 USB connector, not even RESET works. Also, I tried both Segger OpenSDA2 and mbed apps loaded on the OpenSDA controller, and results do not change.


I need to use one of the 2 USB connectors to power the board; I do not want to use the 3V3 or 5-9V power input pins on J3. My question is: should I cut some jumper trace, and solder jumper pins? Maybe change some of the already installed jumper setting?