STAT_RX_RDY
(i & STAT_RX_RDY) << 14)
if (uart_getreg(bas, UART_STAT) & STAT_RX_RDY)
while (!(uart_getreg(bas, UART_STAT) & STAT_RX_RDY))
#define STAT_TRANS_MASK (STAT_OVR_ERR | STAT_BRK_DET | STAT_RX_RDY)