Hi all :

We tried to use uart3 to communicate with peripherals design part,I know /dev/ttyTHS2 is maped uart1,but /dev/ttyTHS1 and /dev/ttyTHS3 without effect.How can we use UART3 ?

Thank you!

Hi dittoxjj,

If you are asking about UART3 pins of the module, it doesn’t really have any signal output. Please refer to “UART” section of

thanks for your help!
uart3 use for WiFi/Bt is means I can not use uart3 as uart function?

Do I have to change the hardware ?

WiFi/BT connection is inside the module and UART3 pads of the module have no real hardware pin out from tegra. So you cannot use UART3 of the module.

There are 5 UARTs routed out on JTX1 board to board connector.

UART0(TX1_UART1) is for debug use which routed to J10 Debug connector and J21 Expansion Header, There is a UART MUX auto switcher(When the 60-pin debug connector J10 is being used UART is routed to the 60-pin debug connector J10, When the 60-pin debug connector J10 is NOT being used UART is routed to the 40pin stake pin header J21).
UART1(TX1_UART3) is routed to J17 with 1v8 to 3v3 level shift.
UART2(TX1_UART2) is routed to J18 M.2 Key E slot.
UART3(TX1_UART4) have a NO STUFF 0ohm resistor connect to J21(UART1_HDR_3V3). TX1_UART4 is also have NOT STUFF 0ohm resistor on JTX1 CVM board which default is routed to WIFI/BT chip. This UART can’t be used at all.
UART4(SNN_J1_RSVD), this is not connected signal on JTX1 CVM.

You could use the UART1(TX1_UART3) on J17 of P2597 carrier board for general use.

Thanks very much!