CC2640: How to extend CC2640 Data length received

Part Number:CC2640

Dear,

I use CC2640 in my applicaiton, and I used CC2640NPIUARTECHO EXAMPLE  to debug. 

But I found my data length received maxinum is 32 bits, when I want to receive more bits, it will trigger other Event.

So my question is how to extend my data length of receiving? I want to receive more than 32bit every time? Thx