Dear all! we are currently using a UDOO X86 with a DJI Matrice300 drone. The communication with this drone is trough UART. We have enabled the HSUART from the bios and in the OS the ttyS4/ttyS5 appeared, but they did not communicate with the UAV. We also used a bidirectional logic level converter (1.8 V - 3.2 V). In our opinion we must use the standard UART instead of HSUART, but we did not understand how to enable the UART and on which pins is it. The question is how to use UART legacy mode on tty0 and tty1? The only information is on the online manual: Use the UART in Linux The UART 1 and UART 2 are shown respectively as /dev/ttyS4 and /dev/ttyS5 when configured as HSUART mode(default configuration). If you can't find this two serial in Linux, you probably need to disable the Virtual COM option in the BIOS menu (Can be changed only when HSUART #1 and HSUART #2 are Enabled). If Disabled, the Virtual COM won't be added to the ACPI table. The UART 1 and UART 2 are shown respectively as /dev/tty0 and /dev/tty1 when configured in Legacy mode.Best regards Lapo
