读取cc2520寄存器，当按键1被按下，寄存器的值通过SPI口输出。-This application reads the register values of CC2520. The values are output on the serial port when Button 1 is pushed. Configure the PC HyperTerminal for baudrate 38400 bps, 8 data bits no parity

基于RFID的公交卡充值，里面有按键按下显示在lcd屏幕上，按键1是充值，按键2是清零(Top - charge of public transportation card based on RFID)