topic Re: KV56 Does not run without debugger connected in Kinetis Microcontrollers

KV56 Does not run without debugger connected

derekcook — Thu, 30 Jun 2022 16:05:46 GMT

Hello,

My hardware and software runs when the J-Link debugger is connected with the KV56 MCU, but if I disconnect the debugger via stop in MCUXpresso the code freezes and also if I power the board without the debugger connected the code does not run.

Why would this be? Is there something I need to do in MCUXpresso to get KV56 to run without debugger connected?

Re: KV56 Does not run without debugger connected

ErichStyger — Thu, 30 Jun 2022 16:44:49 GMT

Are you using printf with semihosting?

If so, not having the correct hardfault handler will cause your target to stop if you print something.

Re: KV56 Does not run without debugger connected

derekcook — Thu, 30 Jun 2022 18:58:54 GMT

It looks like the debugger unlocks the DWT but you have to do this yourself if not using the debugger. See this post: https://community.nxp.com/t5/Kinetis-Microcontrollers/KV58-DWT-Delay-Problem-DWT%E5%BB%B6%E6%97%B6%E5%8D%A1%E6%AD%BB/m-p/844140

I had to add this to the CM7 header

Then I had to add unlocking the DWT registers