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CC2530 与主控CPU 通过串口通信不通

Other Parts Discussed in Thread: CC2530

軟件在調試主控CPU7與CC2530通過UART通信時發現兩者之間TX,RX不通,就是2530向CPU发送数据cpu收不到或收到的不对,
因為CC2530 uart TXRX電壓是3V而CPU MSM8937 uart txrx 電壓是1.8V,所以我們在兩者之間用了一個levelshift ,
level shift两端电压是正常的,
但把level shift去掉用電腦直接控制CC2530的UART TX RX是可以通信的
請問是2530本身就帶LEVEL shift功能還是我們加這個level shift有問題?還是軟件配置有問題?