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diff --git a/circuitpython/shared-bindings/bitbangio/SPI.h b/circuitpython/shared-bindings/bitbangio/SPI.h
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+/*
+ * This file is part of the MicroPython 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_BITBANGIO_SPI_H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_BITBANGIO_SPI_H
+
+#include "py/obj.h"
+
+#include "common-hal/microcontroller/Pin.h"
+#include "shared-module/bitbangio/SPI.h"
+
+// Type object used in Python. Should be shared between ports.
+extern const mp_obj_type_t bitbangio_spi_type;
+
+// Construct an underlying SPI object.
+extern void shared_module_bitbangio_spi_construct(bitbangio_spi_obj_t *self,
+    const mcu_pin_obj_t *clock, const mcu_pin_obj_t *mosi,
+    const mcu_pin_obj_t *miso);
+
+extern void shared_module_bitbangio_spi_deinit(bitbangio_spi_obj_t *self);
+extern bool shared_module_bitbangio_spi_deinited(bitbangio_spi_obj_t *self);
+
+extern void shared_module_bitbangio_spi_configure(bitbangio_spi_obj_t *self,
+    uint32_t baudrate, uint8_t polarity, uint8_t phase, uint8_t bits);
+
+extern bool shared_module_bitbangio_spi_try_lock(bitbangio_spi_obj_t *self);
+extern bool shared_module_bitbangio_spi_has_lock(bitbangio_spi_obj_t *self);
+extern void shared_module_bitbangio_spi_unlock(bitbangio_spi_obj_t *self);
+
+// Writes out the given data.
+extern bool shared_module_bitbangio_spi_write(bitbangio_spi_obj_t *self, const uint8_t *data, size_t len);
+
+// Reads in len bytes while outputting zeroes.
+extern bool shared_module_bitbangio_spi_read(bitbangio_spi_obj_t *self, uint8_t *data, size_t len, uint8_t write_value);
+
+// Transfer out len bytes while reading len bytes
+extern bool shared_module_bitbangio_spi_transfer(bitbangio_spi_obj_t *self, const uint8_t *dout, uint8_t *din, size_t len);
+
+#endif // MICROPY_INCLUDED_SHARED_BINDINGS_BITBANGIO_SPI_H