diff --git a/ports/stm32f4/peripherals/stm32f4/periph.h b/ports/stm32f4/peripherals/stm32f4/periph.h
new file mode 100644
index 0000000000..2bcaf4ed92
--- /dev/null
+++ b/ports/stm32f4/peripherals/stm32f4/periph.h
@@ -0,0 +1,103 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland 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.
+ */
+
+// DO NOT include this file directly. Use shared-bindings/microcontroller/Pin.h instead to ensure
+// that all necessary includes are already included.
+
+#ifndef __MICROPY_INCLUDED_STM32F4_PERIPHERALS_PERIPH_H__
+#define __MICROPY_INCLUDED_STM32F4_PERIPHERALS_PERIPH_H__
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "stm32f4xx_hal.h"
+#include "stm32f4/pins.h"
+
+#define GPIO_A  0
+#define GPIO_B  1
+#define GPIO_C  2
+#define GPIO_D  3
+#define GPIO_E  4
+#define GPIO_F  5
+#define GPIO_G  6
+#define GPIO_H  7
+#define GPIO_I  8
+#define GPIO_J  9
+#define GPIO_K  10
+
+#define NO_ALT  0x0F
+
+extern const mp_obj_type_t prefix_fields;
+
+// I2C
+
+typedef struct {
+    mp_obj_base_t base;
+    uint8_t i2c_index:3; // Index of the I2C unit
+    uint8_t alt_index:4; // Alt index is arbitrary, it just lists additional pin options
+    uint8_t sda_pin_port:4;
+    uint8_t sda_pin_number:4;
+    uint8_t scl_pin_port:4;
+    uint8_t scl_pin_number:4;
+} mcu_i2c_periph_obj_t;
+
+#define I2C(i2c_index, alt_index, sda_port, sda_number, scl_port, scl_number)       \
+{ \
+    { &prefix_fields }, \
+    .i2c_index = i2c_index, \
+    .sda_pin_port = sda_port, \
+    .sda_pin_number = sda_number, \
+    .scl_pin_port = scl_port, \
+    .scl_pin_number = scl_number \
+}
+
+//ALT
+// typedef struct {
+//     mp_obj_base_t base;
+//     uint8_t i2c_index:4; // Index of the I2C unit
+//     uint8_t alt_index:4; // Alt index is arbitrary, it just lists additional pin options
+//     mcu_pin_obj_t * sda;
+//     mcu_pin_obj_t * scl;
+// } mcu_i2c_periph_obj_t;
+
+// #define I2C(i2c_index, alt_index, sda, scl)       \
+// { \
+//     { &prefix_fields }, \
+//     .i2c_index = i2c_index, \
+//     .sda = sda, \
+//     .scl = scl, \
+// }
+
+// TODO: SPI, UART, etc
+
+// Choose based on chip
+#ifdef STM32F412Zx
+#include "stm32f412zx/periph.h"
+#endif
+#ifdef STM32F411xE
+#include "stm32f411xe/periph.h"
+#endif
+#endif // __MICROPY_INCLUDED_STM32F4_PERIPHERALS_PERIPH_H__
diff --git a/ports/stm32f4/peripherals/stm32f4/stm32f411xe/periph.c b/ports/stm32f4/peripherals/stm32f4/stm32f411xe/periph.c
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/ports/stm32f4/peripherals/stm32f4/stm32f411xe/periph.h b/ports/stm32f4/peripherals/stm32f4/stm32f411xe/periph.h
new file mode 100644
index 0000000000..d3485fc6ed
--- /dev/null
+++ b/ports/stm32f4/peripherals/stm32f4/stm32f411xe/periph.h
@@ -0,0 +1,32 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland 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_STM32F4_PERIPHERALS_STM32F411VE_PERIPH_H
+#define MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F411VE_PERIPH_H
+
+extern const mcu_i2c_periph_obj_t periph_I2C1;
+
+#endif // MICROPY_INCLUDED_STM32F4_PERIPHERALS_STM32F411VE_PERIPH_H
\ No newline at end of file