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diff --git a/circuitpython/shared-bindings/bitbangio/I2C.h b/circuitpython/shared-bindings/bitbangio/I2C.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
+ *
+ * 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_I2C_H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_BITBANGIO_I2C_H
+
+#include "py/obj.h"
+
+#include "common-hal/microcontroller/Pin.h"
+#include "shared-module/bitbangio/I2C.h"
+
+// Type object used in Python. Should be shared between ports.
+extern const mp_obj_type_t bitbangio_i2c_type;
+
+// Initializes the hardware peripheral.
+extern void shared_module_bitbangio_i2c_construct(bitbangio_i2c_obj_t *self,
+    const mcu_pin_obj_t *scl,
+    const mcu_pin_obj_t *sda,
+    uint32_t frequency,
+    uint32_t us_timeout);
+
+extern void shared_module_bitbangio_i2c_deinit(bitbangio_i2c_obj_t *self);
+extern bool shared_module_bitbangio_i2c_deinited(bitbangio_i2c_obj_t *self);
+
+extern bool shared_module_bitbangio_i2c_try_lock(bitbangio_i2c_obj_t *self);
+extern bool shared_module_bitbangio_i2c_has_lock(bitbangio_i2c_obj_t *self);
+extern void shared_module_bitbangio_i2c_unlock(bitbangio_i2c_obj_t *self);
+
+// Probe the bus to see if a device acknowledges the given address.
+extern bool shared_module_bitbangio_i2c_probe(bitbangio_i2c_obj_t *self, uint8_t addr);
+
+extern uint8_t shared_module_bitbangio_i2c_write(bitbangio_i2c_obj_t *self,
+    uint16_t address,
+    const uint8_t *data, size_t len,
+    bool stop);
+
+// Reads memory of the i2c device picking up where it left off.
+extern uint8_t shared_module_bitbangio_i2c_read(bitbangio_i2c_obj_t *self,
+    uint16_t address,
+    uint8_t *data, size_t len);
+
+#endif // MICROPY_INCLUDED_SHARED_BINDINGS_BITBANGIO_I2C_H