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CC2540串口与max485的通信

Other Parts Discussed in Thread: CC2540

请问TI的各位大神,我使用的是BLE1.4.0蓝牙协议,之前使用网蜂的开发板,上面的CC2540串口是连接的PL2303转换芯片和PC机可以正常的通信,现在换成MAX485就接收不到数据了,好像是CC2540的I/O引脚输出不起作用,无论P0_7=0还是P0_7=1输出都是3.3V,请问这是怎么回事啊?急急急