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unable to read the data from micro controller on ROS

I want to send the data from my robot to ROS over UART, I tried using rosserial but was uncessful, then I tried using the code mentioned in the below link but still I face some problems.

I am using the code as mentioned in the link: (answers.ros.org/question/10114/how-can-ros-communicate-with-my-microcontroller/)

The controller I am using is a 32-bit ARM Controller which sends data over UART to PC (ROS running on Linux) over ttyUSB0 for every 100ms, but I can not see any received data from micro controller on PC, the entire "ucResponse" buffer is only with zero's. I have checked that the data from micro-controller is coming properly out.

Can any one has any idea what is going wrong..?

Thanks in advance