From 2b3f07ee08c722f28cbf480dbcc5276707f78ec4 Mon Sep 17 00:00:00 2001
From: Piotr Esden-Tempski <piotr@esden.net>
Date: Fri, 24 Feb 2012 17:14:50 -0800
Subject: [PATCH] Added reset function to i2c convenience functions.

---
 include/libopencm3/stm32/i2c.h |  1 +
 lib/stm32/i2c.c                | 15 +++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/include/libopencm3/stm32/i2c.h b/include/libopencm3/stm32/i2c.h
index 1cb9a140..cd252431 100644
--- a/include/libopencm3/stm32/i2c.h
+++ b/include/libopencm3/stm32/i2c.h
@@ -316,6 +316,7 @@
 
 /* --- I2C funtion prototypes----------------------------------------------- */
 
+void i2c_reset(u32 i2c);
 void i2c_peripheral_enable(u32 i2c);
 void i2c_peripheral_disable(u32 i2c);
 void i2c_send_start(u32 i2c);
diff --git a/lib/stm32/i2c.c b/lib/stm32/i2c.c
index e1a3b840..41670c30 100644
--- a/lib/stm32/i2c.c
+++ b/lib/stm32/i2c.c
@@ -18,6 +18,21 @@
  */
 
 #include <libopencm3/stm32/i2c.h>
+#include <libopencm3/stm32/f4/rcc.h>
+
+void i2c_reset(u32 i2c)
+{
+	switch (i2c) {
+	case I2C1:
+		rcc_peripheral_reset(&RCC_APB1RSTR, RCC_APB1RSTR_I2C1RST);
+		rcc_peripheral_clear_reset(&RCC_APB1RSTR, RCC_APB1RSTR_I2C1RST);
+		break;
+	case I2C2:
+		rcc_peripheral_reset(&RCC_APB1RSTR, RCC_APB1RSTR_I2C2RST);
+		rcc_peripheral_clear_reset(&RCC_APB1RSTR, RCC_APB1RSTR_I2C2RST);
+		break;
+	}
+}
 
 void i2c_peripheral_enable(u32 i2c)
 {