ES_MODE_OUTPUT
mask = ensoniq->uartm & ES_MODE_OUTPUT ? ES_TXRDY : 0;
if (!(ensoniq->uartm & ES_MODE_OUTPUT)) {
if (!(ensoniq->uartm & ES_MODE_OUTPUT)) {
ensoniq->uartm |= ES_MODE_OUTPUT;
ensoniq->uartm &= ~ES_MODE_OUTPUT;