kw41z reset

[sheshnathchauha]

Hi,

i have use kw41z controller for my ble project but my board is not programming because when i powered my board its always be  in reset  .so kindly give me suggestion ,here i am attching my reset circuit please go through .

thank you

kind

regard

sheshnath

[gerardo_rodriguez]

Hello Sheshnath,

Can you check the reset signal on an oscilloscope? On blank chips, the expected behavior is a saw wave because the MCU keeps resetting as it is loading an invalid address to the stack pointer and program counter. Once flashed, the reset should stop oscillating. 

For the SWD connections refer to the section 2.1.5.1 Debug interface of the document KLQRUG.

Regards,

Gerardo

[diegocomin]

Hi Gerardo,

I have posted my issue confirming the saw wave which I obtain in my blank module (Reset error, debugging KW41Z with an external J-link Base tool), but when I try to flash it (debug) with a J-link tool I always obtain this error:  "Connect under reset", "Communication error while accessing MDM-AP" and the J-Link LED turn red (because it is always resseting).

How can I solve this problem? Please I really need a solution.

Diego C.