Using uart0 rx in jetson nano

Robotics & Edge Computing Jetson & Embedded Systems Jetson Nano
1

I want to use uart0（pin 99 and 101）for simple serial transceiver without using cts and rts。So I change dts file as follows

serial@70006200 {
		compatible = "nvidia,tegra114-hsuart";
		reg = <0x0 0x70006200 0x0 0x40>;
		reg-shift = <0x2>;
		interrupts = <0x0 0x2e 0x4>;
		iommus = <0x2b 0xe>;
		dmas = <0x4c 0xa 0x4c 0xa>;
		dma-names = "rx", "tx";
		clocks = <0x21 0x37 0x21 0xf3>;
		clock-names = "serial", "parent";
		resets = <0x21 0x37>;
		reset-names = "serial";
		nvidia,adjust-baud-rates = <0x1c200 0x1c200 0x64>;
		status = "okay";
		linux,phandle = <0x10a>;
		phandle = <0x10a>;
	};

now I can find ttyTHS2 at MMIO 0x70006200 is a TEGRA_UART。AND I can send message through ttyTHS2， but I can not receive message from the port.
So is there any thing wrong in my dts setting?
Thanks

3

Hi chengfch,

Are you using the devkit or custom board for Jetson Nano?
What’s your Jetpack version in use?

Could you share the full dmesg for further check?

4

after two days testing， I found the uart0 worked fine, the question is the baud rate is not set correctly. The dtb setting is correct.

6

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