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CC2540串口用"USB转TTL"回环测试都OK，但是接上485的转换芯片就发送数据不对了，用示波器测试波形也变了。485的通信芯片是TI的“SN65HVD11D”。
感觉像是CC2540芯片的串口驱动能力不足，望指导一下！
发电路原理图看一下
485-RO ---> P0.2
485-DI ---> P0.3
谢谢大家了！
貌似SN65hvd11的引脚接错了。对照手册检查一下
