/* configure the DMA */
dma.setDMATrigger(DMA.URXIFG0, usart0, 0);
dma.setDMATrigger(DMA.UTXIFG0, usart0, 1);
dma.setDMATrigger(DMA.URXIFG1, usart1, 0);
dma.setDMATrigger(DMA.UTXIFG1, usart1, 1);
dma.setInterruptMultiplexer(new InterruptMultiplexer(cpu, 0));
ioUnits.add(dma);
// Add port 1,2 with interrupt capability!
// IOPorts will add themselves to the CPU