UART011_RXDMAE
uap->dmacr &= ~UART011_RXDMAE;
uap->dmacr &= ~(UART011_DMAONERR | UART011_RXDMAE | UART011_TXDMAE);
uap->dmacr |= UART011_RXDMAE;
uap->dmacr |= UART011_RXDMAE;
uap->dmacr &= ~UART011_RXDMAE;