Not able to read data through serial port

1
votes

I am trying to read data on a serial port.

My setup

  • OS: Ubuntu linux
  • Device 1: BeagleBoard
  • Device 2: My laptop

I am using a serial to usb converter. On the BeagleBoard, the serial device is ttyS2. On the laptop, it is ttyUSB0.

I did a simple thing to test the connection, I ran Minicom on both the machines. When I type something on BeagleBoard I receive data on laptop but it doesn't work the opposite way. What can be the reason?

The setting for serial port on both the devices are

  • Baud rate: 115200
  • Data size: 8
  • Parity:N
  • stop bit:1
  • Hardware flow control : no
1
linuxserial-portbeagleboard
This question is more for superuser than stackoverflow. – Thomas M. DuBuisson
True , i say , give some code or the program that you are using. – siranen
Output of cat /proc/tty/driver/serial at both ends woul be helpful. – ninjalj

1 Answers

2
votes

Could it be that your file permissions are too restrictive on your laptop? I had a similar problem on ubuntu, and solved it by changing the file permissions. You could test this by doing:

sudo chmod 666 /dev/ttyUSB0

Note, these permissions will be reverted when you reset the connection. For a long tem solution you'll have to add yourself to the dialout group by editing /etc/group.