diff options
| -rw-r--r-- | ports/mimxrt/machine_uart.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/ports/mimxrt/machine_uart.c b/ports/mimxrt/machine_uart.c index 1b0c06333..ab1788692 100644 --- a/ports/mimxrt/machine_uart.c +++ b/ports/mimxrt/machine_uart.c @@ -437,7 +437,7 @@ STATIC mp_uint_t machine_uart_ioctl(mp_obj_t self_in, mp_uint_t request, mp_uint ret |= MP_STREAM_POLL_RD; } } - if ((flags & MP_STREAM_POLL_WR)) { + if ((flags & MP_STREAM_POLL_WR) && (self->tx_status == kStatus_LPUART_TxIdle)) { ret |= MP_STREAM_POLL_WR; } } else if (request == MP_STREAM_FLUSH) { |