RS485(/dev/ttyTHS0) lose packet when reboot and first receive data

Autonomous Machines Jetson & Embedded Systems Jetson Xavier NX
1

1: software: JetPack4.5_R32.5.1 hardware: custom board is the same board.
2: tx2 nx SOM + custom board: RS485 work send ok; receive ok.
3: xavier nx SOM + custom board: RS485 work send ok; receive abnormal.

  • phenomenon 1:

    • send in host pc:
      » asdfghjklzxcvbnm123456789
      » asdfghjklzxcvbnm123456789
      » asdfghjklzxcvbnm123456789
      » asdfghjklzxcvbnm123456789

    • receive in xavier nx with cutecom:
      » ghjklzxcvbnm123456789 #the first packet lose some packet
      » asdfghjklzxcvbnm123456789
      » asdfghjklzxcvbnm123456789
      » asdfghjklzxcvbnm123456789

  • phenomenon 2：

    • send in host pc:
      » asdfghjklzxcvbnm123456789
      » asdfghjklzxcvbnm123456789
      » asdfghjklzxcvbnm123456789
      » asdfghjklzxcvbnm123456789

    • receive in xavier nx with cutecom:
      » resource temporarily unavailable #/dev/ttyTHS0 was suddenly closed

what i do:
1: disabled ttyTHS0 debug function refer to https://forums.developer.nvidia.com/t/how-to-disable-ttyths0-and-ttytcu0-debug-function-and-use-both-of-them-as-normal-uart-serial-port/170116, but after change, system cannot startup

2: add properity for serial@3100000 , but not work

  •            /delete-property/ dma-coherent;

  •            nvidia,tolerance-low-range = <0x0>;

  •            nvidia,tolerance-high-range = <0x4>;

  •            nvidia,adjust-baud-rates = <0x1c200 0x1c200 0x64>;

so: should i check my custom board RS485 schematic, or debug RS485 driver?

3

hello 848145724,

could you please have a try by stopping and disabling the nvgetty service,
for example,

1 Like
4

it works, thank you very much!!