https://community.nxp.com/t5/i-MX-RT-Crossover-MCUs/How-to-view-printf-output-while-debugging-i-MX-RT1064-using/m-p/2253101#M35769 <P>Hello everyone,</P><P>I was previously debugging my i.MX RT1064 application through the USB-OTG port, which exposed a virtual COM port and allowed me to view PRINTF() output on a serial terminal without using UART pins.</P><P>Recently, I switched to debugging via <STRONG>PEMicro JTAG</STRONG> in MCUXpresso IDE, and now I am unable to view any console output. I tried using the <STRONG>SWO/ITM printf viewer</STRONG>, but no output appears. I also looked for <STRONG>semihosting options</STRONG>, but they do not exist in the project settings in MCUXpresso IDE when using PEMicro.</P><P><STRONG>My question:</STRONG></P><P>Is there any software-only method to view printf console output while debugging via PEMicro JTAG on i.MX RT1064, without connecting external UART hardware?<BR />How do i debug my code by viewing debug console?</P> Tue, 02 Dec 2025 10:29:52 GMT shreya1 2025-12-02T10:29:52Z https://community.nxp.com/t5/i-MX-RT-Crossover-MCUs/How-to-view-printf-output-while-debugging-i-MX-RT1064-using/m-p/2253101#M35769 <P>Hello everyone,</P><P>I was previously debugging my i.MX RT1064 application through the USB-OTG port, which exposed a virtual COM port and allowed me to view PRINTF() output on a serial terminal without using UART pins.</P><P>Recently, I switched to debugging via <STRONG>PEMicro JTAG</STRONG> in MCUXpresso IDE, and now I am unable to view any console output. I tried using the <STRONG>SWO/ITM printf viewer</STRONG>, but no output appears. I also looked for <STRONG>semihosting options</STRONG>, but they do not exist in the project settings in MCUXpresso IDE when using PEMicro.</P><P><STRONG>My question:</STRONG></P><P>Is there any software-only method to view printf console output while debugging via PEMicro JTAG on i.MX RT1064, without connecting external UART hardware?<BR />How do i debug my code by viewing debug console?</P> Tue, 02 Dec 2025 10:29:52 GMT https://community.nxp.com/t5/i-MX-RT-Crossover-MCUs/How-to-view-printf-output-while-debugging-i-MX-RT1064-using/m-p/2253101#M35769 shreya1 2025-12-02T10:29:52Z https://community.nxp.com/t5/i-MX-RT-Crossover-MCUs/How-to-view-printf-output-while-debugging-i-MX-RT1064-using/m-p/2256697#M35806 <P>Hi&nbsp;<a href="https://community.nxp.com/t5/user/viewprofilepage/user-id/254440">@shreya1</a>&nbsp;,</P> <P>Thanks for your interest in NXP MIMXRT series!</P> <P>First, your initial approach using USB-OTG CDC virtual serial port is viable. If you wish to use SWO/ITM, please refer to this application note:</P> <P><A href="https://www.nxp.com/docs/en/application-note/AN13234.pdf" target="_blank">https://www.nxp.com/docs/en/application-note/AN13234.pdf</A></P> <P>It mentioned:</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Gavin_Jia_1-1765175333873.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/368886iBEC6947B023ECB8A/image-size/medium?v=v2&amp;px=400" role="button" title="Gavin_Jia_1-1765175333873.png" alt="Gavin_Jia_1-1765175333873.png" /></span></P> <P>&nbsp;</P> <P>Additionally, using the Semihosting within the MCUXpresso IDE also works. Beyond that, if you're using JLink, consider RTT; if you only need to monitor variables without printing logs, consider FreeMaster.</P> <P>Best regards,<BR />Gavin</P> <P>&nbsp;</P> Mon, 08 Dec 2025 06:29:05 GMT https://community.nxp.com/t5/i-MX-RT-Crossover-MCUs/How-to-view-printf-output-while-debugging-i-MX-RT1064-using/m-p/2256697#M35806 Gavin_Jia 2025-12-08T06:29:05Z