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diff --git a/circuitpython/shared-bindings/busio/UART.h b/circuitpython/shared-bindings/busio/UART.h
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+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_SHARED_BINDINGS_BUSIO_UART_H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_BUSIO_UART_H
+
+#include "common-hal/microcontroller/Pin.h"
+#include "common-hal/busio/UART.h"
+#include "py/ringbuf.h"
+
+extern const mp_obj_type_t busio_uart_type;
+
+typedef enum {
+    BUSIO_UART_PARITY_NONE,
+    BUSIO_UART_PARITY_EVEN,
+    BUSIO_UART_PARITY_ODD
+} busio_uart_parity_t;
+
+// Construct an underlying UART object.
+extern void common_hal_busio_uart_construct(busio_uart_obj_t *self,
+    const mcu_pin_obj_t *tx, const mcu_pin_obj_t *rx,
+    const mcu_pin_obj_t *rts, const mcu_pin_obj_t *cts,
+    const mcu_pin_obj_t *rs485_dir, bool rs485_invert,
+    uint32_t baudrate, uint8_t bits, busio_uart_parity_t parity, uint8_t stop,
+    mp_float_t timeout, uint16_t receiver_buffer_size, byte *receiver_buffer,
+    bool sigint_enabled);
+
+extern void common_hal_busio_uart_deinit(busio_uart_obj_t *self);
+extern bool common_hal_busio_uart_deinited(busio_uart_obj_t *self);
+
+// Read characters. len is in characters NOT bytes!
+extern size_t common_hal_busio_uart_read(busio_uart_obj_t *self,
+    uint8_t *data, size_t len, int *errcode);
+
+// Write characters. len is in characters NOT bytes!
+extern size_t common_hal_busio_uart_write(busio_uart_obj_t *self,
+    const uint8_t *data, size_t len, int *errcode);
+
+extern uint32_t common_hal_busio_uart_get_baudrate(busio_uart_obj_t *self);
+extern void common_hal_busio_uart_set_baudrate(busio_uart_obj_t *self, uint32_t baudrate);
+extern mp_float_t common_hal_busio_uart_get_timeout(busio_uart_obj_t *self);
+extern void common_hal_busio_uart_set_timeout(busio_uart_obj_t *self, mp_float_t timeout);
+
+extern uint32_t common_hal_busio_uart_rx_characters_available(busio_uart_obj_t *self);
+extern void common_hal_busio_uart_clear_rx_buffer(busio_uart_obj_t *self);
+extern bool common_hal_busio_uart_ready_to_tx(busio_uart_obj_t *self);
+
+extern void common_hal_busio_uart_never_reset(busio_uart_obj_t *self);
+
+#endif  // MICROPY_INCLUDED_SHARED_BINDINGS_BUSIO_UART_H