RTOS: CC26XX UART TO RF ZSTACK HOME

Tool/software: TI-RTOS

Hi,

       i want use  CC26XX in zigbee  to complement the function " UART TO RF " in ZSTACK  home,the focus is that i am not sure  where to read the data.

if i do it like this, how to get the readCallback parase?

static void MSA_Init(void)
{
  UInt msaWaitPeriod = MSA_WAIT_PERIOD * 1000 / Clock_tickPeriod;          // 隔一段时间执行一次
  UInt msaLed4Period = MSA_LED4_INITIAL_PERIOD * 1000 / Clock_tickPeriod;
 
  /* Open uart driver */
  SbpUartParams.baudRate=9600;
  SbpUartParams.readCallback=readCallback;
 
  UART_Params_init(&SbpUartParams);

thanks a lot!