UART011_DR_BE
port->read_status_mask |= UART011_DR_BE;
port->ignore_status_mask |= UART011_DR_BE;
if (ch & UART011_DR_BE) {
if (ch & UART011_DR_BE)
#define UART_DR_ERROR (UART011_DR_OE | UART011_DR_BE | UART011_DR_PE | UART011_DR_FE)