radio = new CC2420(cpu);
radio.setCCAPort(port1, CC2420_CCA);
radio.setFIFOPPort(port1, CC2420_FIFOP);
radio.setFIFOPort(port1, CC2420_FIFO);
usart0.addUSARTListener(this);
radio.setSFDPort(port4, CC2420_SFD);
USART usart = cpu.getIOUnit(USART.class, "USART1");
if (usart != null) {
registry.registerComponent("serialio", usart);