Jetson Nano UART1 (ball name = uart2) as gpio

Autonomous Machines Jetson & Embedded Systems Jetson Nano
#1

Hi,

I want to use UART2 (ball name in pinmux excel) as a GPIO. If I set the pinmux for the UART2 to GPIO, the dtsi-files generate are not update for the UART2. I have change the dtsi-files to set UART2 to GPIO, but when I rebuild the kernel and flash the Jetson Nano, the UART2 is still set as UART.
Next I tried to export the UART pin to the GPIO-files but didn’t work to.

  • $ echo 49> /sys/class/gpio/export
  • $ echo out > /sys/class/gpio/gpio49/direction
  • $ echo 1 > /sys/class/gpio/gpio49/value
  • $ echo 0 > /sys/class/gpio/gpio49/value
  • $ echo 49 > /sys/class/gpio/unexport

Is there an other way to set the UART2 to GPIO.
For all the other UART’s I was able to change them to GPIO.

Thanks
Dieter

#3

hello dieter.vanolmen,

had you access pinmux spreadsheets and refer to application notes to have 40-pin expansion header configurations.
thanks

#4

Hi,

I checked the applications notes, but I use the production module. I followed all the steps to update the pinmux and export it to build a new kernel. All the changes made in the pinmux are working on the module accept the change for the UART2 (ball name in pinmux) from UART to GPIO.

Thanks
Dieter