uart problem about CC2540 & BLE stack

I have met a problem of uart on CC2540 platform with BLE stack.

I used a uart assistant on the computer, send data to the platform,and then it send  the data back to the uart assistant.

But, I find the data received by uart assistant is diferent with the data it sent.

建议参考BLE stack里的SimpleBLEPeripheral例程，有UART配置的内容

另外可参考网友分享：http://www.cnblogs.com/danchaofan/p/4240006.html

1、查看自己的串口配置是不是，串口助手中那样配置

2、另外 ，串口助手可以用hex显示

3、可以在线仿真看结果