stm32/machine_uart: Retain attached-to-repl setting when init'ing UART.

1 files changed, 6 insertions, 0 deletions

diff --git a/ports/stm32/machine_uart.c b/ports/stm32/machine_uart.c
index 232f3629e..1cf5817e0 100644
--- a/ports/stm32/machine_uart.c
+++ b/ports/stm32/machine_uart.c
@@ -283,11 +283,17 @@ STATIC mp_obj_t pyb_uart_init_helper(pyb_uart_obj_t *self, size_t n_args, const
     // flow control
     uint32_t flow = args.flow.u_int;
 
+    // Save attach_to_repl setting because uart_init will disable it.
+    bool attach_to_repl = self->attached_to_repl;
+
     // init UART (if it fails, it's because the port doesn't exist)
     if (!uart_init(self, baudrate, bits, parity, stop, flow)) {
         mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("UART(%d) doesn't exist"), self->uart_id);
     }
 
+    // Restore attach_to_repl setting so UART still works if attached to dupterm.
+    uart_attach_to_repl(self, attach_to_repl);
+
     // set timeout
     self->timeout = args.timeout.u_int;