UART_DM_TX_READY
while (((*UART_DM_ISR & UART_DM_TX_READY) == 0) && --limit) {
while ((uart_getreg(bas, UART_DM_ISR) & UART_DM_TX_READY) == 0
u->ier |= UART_DM_TX_READY;
if (isr & UART_DM_TX_READY) {
u->ier &= ~UART_DM_TX_READY;
#define UART_DM_IMR_ENABLED (UART_DM_TX_READY | \