topic Serial output problem with Segger Ultra+ (endless stream of null chars) in Kinetis Microcontrollers https://community.nxp.com/t5/Kinetis-Microcontrollers/Serial-output-problem-with-Segger-Ultra-endless-stream-of-null/m-p/399092#M22087 <HTML><HEAD></HEAD><BODY><P>I haven't been able to get any response from Segger regarding this issue, so I thought I would ask the community to see if anyone else here has had the problem I am currently experiencing with my Ultra+.&nbsp; When I connect it to my customer K64-based board, or even the FRDM-K64F, my serial terminal program just receives an endless stream of null characters.&nbsp; debug_printf doesn't seem to work at all.&nbsp; I've confirmed that my JTAG pins in PEx are configured properly.&nbsp; I actually just switched the JLinkArm.dll so I could use the OpenSDAv2 firmware instead of the Ultra+, and debug_printf magically starts working.</P><P></P><P>This leads me to believe that this is an Ultra+ issue and not something in my firmware.</P><P></P><P>Has anyone else experienced this problem and/or know how to correct it?&nbsp; Thanks!</P></BODY></HTML> Mon, 04 May 2015 15:06:26 GMT dave408 2015-05-04T15:06:26Z Serial output problem with Segger Ultra+ (endless stream of null chars) https://community.nxp.com/t5/Kinetis-Microcontrollers/Serial-output-problem-with-Segger-Ultra-endless-stream-of-null/m-p/399092#M22087 <HTML><HEAD></HEAD><BODY><P>I haven't been able to get any response from Segger regarding this issue, so I thought I would ask the community to see if anyone else here has had the problem I am currently experiencing with my Ultra+.&nbsp; When I connect it to my customer K64-based board, or even the FRDM-K64F, my serial terminal program just receives an endless stream of null characters.&nbsp; debug_printf doesn't seem to work at all.&nbsp; I've confirmed that my JTAG pins in PEx are configured properly.&nbsp; I actually just switched the JLinkArm.dll so I could use the OpenSDAv2 firmware instead of the Ultra+, and debug_printf magically starts working.</P><P></P><P>This leads me to believe that this is an Ultra+ issue and not something in my firmware.</P><P></P><P>Has anyone else experienced this problem and/or know how to correct it?&nbsp; Thanks!</P></BODY></HTML> Mon, 04 May 2015 15:06:26 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Serial-output-problem-with-Segger-Ultra-endless-stream-of-null/m-p/399092#M22087 dave408 2015-05-04T15:06:26Z Re: Serial output problem with Segger Ultra+ (endless stream of null chars) https://community.nxp.com/t5/Kinetis-Microcontrollers/Serial-output-problem-with-Segger-Ultra-endless-stream-of-null/m-p/399093#M22088 <HTML><HEAD></HEAD><BODY><P>My current workaround is to use semihosting, which seems to work fine.</P></BODY></HTML> Thu, 04 Jun 2015 13:49:49 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Serial-output-problem-with-Segger-Ultra-endless-stream-of-null/m-p/399093#M22088 dave408 2015-06-04T13:49:49Z Re: Serial output problem with Segger Ultra+ (endless stream of null chars) https://community.nxp.com/t5/Kinetis-Microcontrollers/Serial-output-problem-with-Segger-Ultra-endless-stream-of-null/m-p/399094#M22089 <HTML><HEAD></HEAD><BODY><P>FWIW, I have emailed Segger technical support in the US *twice* regarding this, and they have never responded.&nbsp; Sad.</P></BODY></HTML> Thu, 04 Jun 2015 14:06:20 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Serial-output-problem-with-Segger-Ultra-endless-stream-of-null/m-p/399094#M22089 dave408 2015-06-04T14:06:20Z