CC2541 P02/P03作为中断唤醒MCU后，初始成UART

各位：

如题，我现在将P02/P03默认作为普通IO口，配置如下：

P0SEL &= ~(BV(2)|BV(3));

P0DIR &= ~BV(2);
P0IEN |= BV(2);
P0IFG &= ~BV(2);

P0DIR |= BV(3);
P0 &= ~BV(3);

当IO口唤醒MCU后，将P02/P03初始成UART，初始代码如下：

HalUARTInit();
  
    halUARTCfg_t uartConfig;
    
    // configure UART
    uartConfig.configured               = TRUE;
    uartConfig.baudRate                 = bps;
    uartConfig.flowControl              = FALSE;
    uartConfig.flowControlThreshold     = 0;//48;
    uartConfig.rx.maxBufSize            = 128;
    uartConfig.tx.maxBufSize            = 128;
    uartConfig.idleTimeout              = 6;
    uartConfig.intEnable                = TRUE;
    uartConfig.callBackFunc             = wechatUartCallBack;
    // start UART
    // Note: Assumes no issue opening UART port.
    (void)HalUARTOpen( NPI_UART_PORT, &uartConfig );

但是现在UART发不出去数据，也接收不到数据，请问是怎么回事呢