topic The microcontroller permanently do a reset in Kinetis Microcontrollers https://community.nxp.com/t5/Kinetis-Microcontrollers/The-microcontroller-permanently-do-a-reset/m-p/508337#M31987 <HTML><HEAD></HEAD><BODY><P>hi!!! I am making a bootloader in a KM34z128M5, testing the firmware, this jumped to hard fault. From that moment, everytime that the device is powered up, the microcontroller permanently do a reset. I have tried to flash the microcontroller or simply erase again but it is impossible doing it debit to reset.</P><P></P><P>If someone could help me I would be grateful</P></BODY></HTML> Fri, 22 Jan 2016 09:47:25 GMT davidmartínezag 2016-01-22T09:47:25Z The microcontroller permanently do a reset https://community.nxp.com/t5/Kinetis-Microcontrollers/The-microcontroller-permanently-do-a-reset/m-p/508337#M31987 <HTML><HEAD></HEAD><BODY><P>hi!!! I am making a bootloader in a KM34z128M5, testing the firmware, this jumped to hard fault. From that moment, everytime that the device is powered up, the microcontroller permanently do a reset. I have tried to flash the microcontroller or simply erase again but it is impossible doing it debit to reset.</P><P></P><P>If someone could help me I would be grateful</P></BODY></HTML> Fri, 22 Jan 2016 09:47:25 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/The-microcontroller-permanently-do-a-reset/m-p/508337#M31987 davidmartínezag 2016-01-22T09:47:25Z Re: The microcontroller permanently do a reset https://community.nxp.com/t5/Kinetis-Microcontrollers/The-microcontroller-permanently-do-a-reset/m-p/508338#M31988 <HTML><HEAD></HEAD><BODY><P>Hello David:</P><P></P><P>What IDE and debugging tool are you using?</P><P></P><P>It should be possible to reprogram or erase the device, unless it is secured and mass erase is disabled.</P><P></P><P>Another possible cause is that the SWD pins are disabled early in the code by changing the pins to a different function. Have you reconfigured the SWD pins?</P><P></P><P>There are some software tools to regain access to the device if it is not permanently locked, but it depends on your debug probe:</P><P></P><P>- With P&amp;E toos (e.g. Universal Multilink), there is the <STRONG><A href="http://www.pemicro.com/downloads/download_file.cfm?download_id=393">P&amp;E_recovery_utility</A></STRONG>:</P><P></P><P><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_2.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/56083i91675D82453F92A2/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_2.png" alt="pastedImage_2.png" /></span></P><P></P><P>- With Segger tools, there is a software pack which includes the <STRONG>J-Link commander</STRONG>, which you can use to unlock and erase Kinetis devices. The download link: <A href="https://www.segger.com/jlink-software.html" title="https://www.segger.com/jlink-software.html">SEGGER - The Embedded Experts for RTOS and Middleware, Debug Probes and Production Programmers - Download</A></P><P></P><P>There are some good posts by colleague Erich Styger about these tools:</P><P></P><P><A href="http://mcuoneclipse.com/2013/06/16/bricking-and-recovering-frdm-kl25z-boards-reset-swd-clock-and-low-power/" title="http://mcuoneclipse.com/2013/06/16/bricking-and-recovering-frdm-kl25z-boards-reset-swd-clock-and-low-power/">Bricking and Recovering FRDM-KL25Z Boards: Reset, SWD Clock and Low Power | MCU on Eclipse</A></P><P><A href="http://mcuoneclipse.com/2014/10/05/unlocking-and-erasing-flash-with-segger-j-link/" title="http://mcuoneclipse.com/2014/10/05/unlocking-and-erasing-flash-with-segger-j-link/">Unlocking and Erasing FLASH with Segger J-Link | MCU on Eclipse</A></P><P><BR />Best Regards!<BR />Jorge Gonzalez</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Mon, 25 Jan 2016 18:50:25 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/The-microcontroller-permanently-do-a-reset/m-p/508338#M31988 Jorge_Gonzalez 2016-01-25T18:50:25Z