说明：  The Nordic Semiconductor nRF24L01 is a transceiver chip operating in the 2.4GHz band. The following code is my first driver for Atmel ATMEGA8 and ATMEGA168. In my test scenario the ATMEGA168 and ATMEGA8 were connected different. The reason for this is that the ATMEGA168 supports Pin Change Interrupt which the ATMEGA8 doesn t.