i programming kw40z board by jlink (IAR).
the error message ( failed to get cpu status after 4 retries retry ) appear final step go .
how can i do to solve this problem?
looks as issue with power supply of MCU. Also you can check if the correct debug connection is selected in IAR (SWD or J-LINK) for Cortex M0+ base MCU has to be SWD.
What kind of debug interface are you using external or integrated in the board for example on freedom board ?
HI Pavel :
My MCU power from power supplier.
i think i have been programming it but i don't know why i reset power ,the kw40z return initial step .
thanks for you help