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diff --git a/libopencm3/lib/lpc43xx/i2c.c b/libopencm3/lib/lpc43xx/i2c.c
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+++ b/libopencm3/lib/lpc43xx/i2c.c
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+/** @defgroup i2c_file I2C
+
+@ingroup LPC43xx
+
+@brief <b>libopencm3 LPC43xx I2C</b>
+
+@version 1.0.0
+
+@author @htmlonly &copy; @endhtmlonly 2012 Michael Ossmann <mike@ossmann.com>
+
+LGPL License Terms @ref lgpl_license
+*/
+
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2012 Michael Ossmann <mike@ossmann.com>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * This is a very minimal I2C driver just to make sure we can get the
+ * peripheral working.
+ */
+
+/**@{*/
+
+#include <libopencm3/lpc43xx/i2c.h>
+#include <libopencm3/lpc43xx/scu.h>
+#include <libopencm3/lpc43xx/cgu.h>
+
+void i2c0_init(const uint16_t duty_cycle_count)
+{
+	/* enable input on SCL and SDA pins */
+	SCU_SFSI2C0 = SCU_I2C0_NOMINAL;
+
+	I2C0_SCLH = duty_cycle_count;
+	I2C0_SCLL = duty_cycle_count;
+
+	/* clear the control bits */
+	I2C0_CONCLR = (I2C_CONCLR_AAC | I2C_CONCLR_SIC
+			| I2C_CONCLR_STAC | I2C_CONCLR_I2ENC);
+
+	/* enable I2C0 */
+	I2C0_CONSET = I2C_CONSET_I2EN;
+}
+
+/* transmit start bit */
+void i2c0_tx_start(void)
+{
+	I2C0_CONCLR = I2C_CONCLR_SIC;
+	I2C0_CONSET = I2C_CONSET_STA;
+	while (!(I2C0_CONSET & I2C_CONSET_SI));
+	I2C0_CONCLR = I2C_CONCLR_STAC;
+}
+
+/* transmit data byte */
+void i2c0_tx_byte(uint8_t byte)
+{
+	if (I2C0_CONSET & I2C_CONSET_STA) {
+		I2C0_CONCLR = I2C_CONCLR_STAC;
+	}
+	I2C0_DAT = byte;
+	I2C0_CONCLR = I2C_CONCLR_SIC;
+	while (!(I2C0_CONSET & I2C_CONSET_SI));
+}
+
+/* receive data byte */
+uint8_t i2c0_rx_byte(void)
+{
+	if (I2C0_CONSET & I2C_CONSET_STA) {
+		I2C0_CONCLR = I2C_CONCLR_STAC;
+	}
+	I2C0_CONCLR = I2C_CONCLR_SIC;
+	while (!(I2C0_CONSET & I2C_CONSET_SI));
+	return I2C0_DAT;
+}
+
+/* transmit stop bit */
+void i2c0_stop(void)
+{
+	if (I2C0_CONSET & I2C_CONSET_STA) {
+		I2C0_CONCLR = I2C_CONCLR_STAC;
+	}
+	I2C0_CONSET = I2C_CONSET_STO;
+	I2C0_CONCLR = I2C_CONCLR_SIC;
+}
+
+/**@}*/
+