https://community.nxp.com/t5/i-MX-Processors/SWD-Bitbanging-with-Arduino-Portenta-x8/m-p/2171875#M240795 <P><SPAN>Hello,</SPAN><BR /><SPAN>I’ve been using the<A href="https://shop.blinkinlabs.com/products/jtag-hat" target="_self"> Blinkinlabs JTAG Hat</A> with a Raspberry Pi 3 and OpenOCD successfully for debugging devices. I followed the example from their <A href="https://github.com/Blinkinlabs/JTAG_hat" target="_self">github</A> for the setup. I’m now trying to use it with an Arduino Portenta X8 (with Hat Carrier), for which I created a custom sysfsgpio config:</SPAN><BR /><SPAN>adapter driver</SPAN><BR /><SPAN>sysfsgpio sysfsgpio_swd_nums 162 166</SPAN><BR /><SPAN>sysfsgpio_srst_num 188</SPAN><BR /><BR /><SPAN>With this setup, I can flash the target device when wiring Portenta's GPIOs directly. However, when routing through the JTAG Hat I get:</SPAN><BR /><SPAN>Error: Error connecting DP: cannot read IDR</SPAN><BR /><BR /><SPAN>I believe the issue is the swdio_dir pin, which sysfsgpio doesn’t support.</SPAN><BR /><SPAN>Is there an adapter/driver compatible with the NXP i.MX8 mini that allows SWD direction pin control?</SPAN><BR /><SPAN>Thanks for your help.</SPAN><BR /><BR /><SPAN>Kind regards,</SPAN><BR /><SPAN>Aditi Verma</SPAN></P> Thu, 18 Sep 2025 09:33:15 GMT AditiV 2025-09-18T09:33:15Z https://community.nxp.com/t5/i-MX-Processors/SWD-Bitbanging-with-Arduino-Portenta-x8/m-p/2171875#M240795 <P><SPAN>Hello,</SPAN><BR /><SPAN>I’ve been using the<A href="https://shop.blinkinlabs.com/products/jtag-hat" target="_self"> Blinkinlabs JTAG Hat</A> with a Raspberry Pi 3 and OpenOCD successfully for debugging devices. I followed the example from their <A href="https://github.com/Blinkinlabs/JTAG_hat" target="_self">github</A> for the setup. I’m now trying to use it with an Arduino Portenta X8 (with Hat Carrier), for which I created a custom sysfsgpio config:</SPAN><BR /><SPAN>adapter driver</SPAN><BR /><SPAN>sysfsgpio sysfsgpio_swd_nums 162 166</SPAN><BR /><SPAN>sysfsgpio_srst_num 188</SPAN><BR /><BR /><SPAN>With this setup, I can flash the target device when wiring Portenta's GPIOs directly. However, when routing through the JTAG Hat I get:</SPAN><BR /><SPAN>Error: Error connecting DP: cannot read IDR</SPAN><BR /><BR /><SPAN>I believe the issue is the swdio_dir pin, which sysfsgpio doesn’t support.</SPAN><BR /><SPAN>Is there an adapter/driver compatible with the NXP i.MX8 mini that allows SWD direction pin control?</SPAN><BR /><SPAN>Thanks for your help.</SPAN><BR /><BR /><SPAN>Kind regards,</SPAN><BR /><SPAN>Aditi Verma</SPAN></P> Thu, 18 Sep 2025 09:33:15 GMT https://community.nxp.com/t5/i-MX-Processors/SWD-Bitbanging-with-Arduino-Portenta-x8/m-p/2171875#M240795 AditiV 2025-09-18T09:33:15Z