read_sbdchn
return read_sbdchn(sport, R_DUART_STATUS) & M_DUART_RX_RDY;
read_sbdchn(sport, R_DUART_RX_HOLD);
return read_sbdchn(sport, R_DUART_STATUS) & M_DUART_TX_RDY;
return read_sbdchn(sport, R_DUART_STATUS) & M_DUART_TX_EMT;
mode2 = read_sbdchn(sport, R_DUART_MODE_REG_2);
status = read_sbdchn(sport, R_DUART_STATUS);
ch = read_sbdchn(sport, R_DUART_RX_HOLD);
mode1 = read_sbdchn(sport, R_DUART_MODE_REG_1);
oldmode1 = read_sbdchn(sport, R_DUART_MODE_REG_1) & mode1mask;
oldmode2 = read_sbdchn(sport, R_DUART_MODE_REG_2) & mode2mask;
oldaux = read_sbdchn(sport, R_DUART_AUXCTL_X) & auxmask;