Need to understand micro controller cc430f5137 code.

[Wafeeq]

Hi Everybody !

I am new to micro controller. I have a sample code of MSP430f5137 controller. I don't under stand its code. can any one tell me about it. thanks

#define INTERRUPT_BUTTON1 (1)
#define INTERRUPT_BUTTON2 (1 << 1)
#define INTERRUPT_BUTTON3 (1 << 2)
#define INTERRUPT_RTC (1 << 3)

phy_rx_cfg_t rx_cfg = {
0,
0x27,
0,
0,
0x01
};