topic iMX6UL EVK : how do I use the Arduino shield UART ? in i.MX Processors https://community.nxp.com/t5/i-MX-Processors/iMX6UL-EVK-how-do-I-use-the-Arduino-shield-UART/m-p/1529397#M195729 <P>Hello,</P><P>I want to use the UART brought to the Arduino shield footprint on the EVK baseboard.</P><P>I am running Linux off the SD card provided with the EVK.</P><P>"dmesg" shows that two UART are setup : ttymxc0 and ttymxc1, with the former being used for the console (USB-to-UART adapter chip).</P><P>I assume that it means ttymxc1 is the UART available on the shield pads. However, I can't get anything out of it.</P><P>I use minicom to send out bytes and check with an oscilloscope, nothing comes out. I tried shorting TX and RX, and I get no echo. The pins are both stuck to 3.3 V all the time.</P><P>I'm rather in a hurry and would like to avoid a deep dive into the EVK and the way Linux is setup. I'm hoping there's something simple I'm missing. Any help will be welcome.</P><P>Regards,</P><P>Jean Roch</P> Wed, 28 Sep 2022 08:48:56 GMT Nefastor 2022-09-28T08:48:56Z iMX6UL EVK : how do I use the Arduino shield UART ? https://community.nxp.com/t5/i-MX-Processors/iMX6UL-EVK-how-do-I-use-the-Arduino-shield-UART/m-p/1529397#M195729 <P>Hello,</P><P>I want to use the UART brought to the Arduino shield footprint on the EVK baseboard.</P><P>I am running Linux off the SD card provided with the EVK.</P><P>"dmesg" shows that two UART are setup : ttymxc0 and ttymxc1, with the former being used for the console (USB-to-UART adapter chip).</P><P>I assume that it means ttymxc1 is the UART available on the shield pads. However, I can't get anything out of it.</P><P>I use minicom to send out bytes and check with an oscilloscope, nothing comes out. I tried shorting TX and RX, and I get no echo. The pins are both stuck to 3.3 V all the time.</P><P>I'm rather in a hurry and would like to avoid a deep dive into the EVK and the way Linux is setup. I'm hoping there's something simple I'm missing. Any help will be welcome.</P><P>Regards,</P><P>Jean Roch</P> Wed, 28 Sep 2022 08:48:56 GMT https://community.nxp.com/t5/i-MX-Processors/iMX6UL-EVK-how-do-I-use-the-Arduino-shield-UART/m-p/1529397#M195729 Nefastor 2022-09-28T08:48:56Z