UART communication in Beaglebone Black

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1

Hi,

I am unable to do simple uart communication in BBB. I have set device tree

uart2_pins: uart2_pins {
pinctrl-single,pins = <
0x154 0x01
0x150 0x31

;
};

&uart2 {
status = “okay”;
pinctrl-names = “default”;
pinctrl-0 = <&uart2_pins>;
};

then I configure the UART Port

stty -F /dev/ttys0 cstopb -evenp ispeed 115200

Then I made a user space application for reading and writing data to
device file. I have attached the application program

I connected Tx and Rx pin in same BBB.(Loop back mode)

But I am not able to do simple UART communication in loop back
mode. Do am I missing something? Please help me

uart_1.c (1.06 KB)

2

Hi,
    I am unable to do simple uart communication in BBB. I have set device tree

uart2_pins: uart2_pins {
pinctrl-single,pins = <
0x154 0x01
0x150 0x31

;

};

&uart2 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&uart2_pins>;
};

then I configure the UART Port

stty -F /dev/ttys0 cstopb -evenp ispeed 115200

           ^^^^^^^^^
stty: /dev/ttys0: No such file or directory

uart2 is not /dev/ttyS0.

uart0 = /dev/ttyS0
uart1 = /dev/ttyS1
uart2 = /dev/ttyS2

Regards,
Peter Hurley

3

Are you sure, that you selected the right UART port???

4

I believe it can be now since v3.19.x but we don’t know the kernel version he’s using so all we can do is guess :(.

There’s a recent thread here with some links with instructions on how to set it up so perhaps the OP can give that a go :thumbup:.