7 files changed, 34 insertions, 6 deletions
diff --git a/include/libopencm3/stm32/common/i2c_common_v1.h b/include/libopencm3/stm32/common/i2c_common_v1.h
index e4998c61..16c8982a 100644
--- a/include/libopencm3/stm32/common/i2c_common_v1.h
+++ b/include/libopencm3/stm32/common/i2c_common_v1.h
@@ -47,6 +47,9 @@ specific memorymap.h header before including this header file.*/
 @{*/
 #define I2C1				I2C1_BASE
 #define I2C2				I2C2_BASE
+#ifdef I2C3_BASE
+#define I2C3				I2C3_BASE
+#endif
 /**@}*/
 
 /* --- I2C registers ------------------------------------------------------- */
@@ -96,6 +99,19 @@ specific memorymap.h header before including this header file.*/
 #define I2C1_TRISE			I2C_TRISE(I2C1)
 #define I2C2_TRISE			I2C_TRISE(I2C2)
 
+/* Not all parts have i2c3 */
+#ifdef I2C3_BASE
+#define I2C3_CR1			I2C_CR1(I2C3)
+#define I2C3_CR2			I2C_CR2(I2C3)
+#define I2C3_OAR1			I2C_OAR1(I2C3)
+#define I2C3_OAR2			I2C_OAR2(I2C3)
+#define I2C3_DR				I2C_DR(I2C3)
+#define I2C3_SR1			I2C_SR1(I2C3)
+#define I2C3_SR2			I2C_SR2(I2C3)
+#define I2C3_CCR			I2C_CCR(I2C3)
+#define I2C3_TRISE			I2C_TRISE(I2C3)
+#endif
+
 /* --- I2Cx_CR1 values ----------------------------------------------------- */
 
 /* SWRST: Software reset */
diff --git a/include/libopencm3/stm32/common/i2c_common_v2.h b/include/libopencm3/stm32/common/i2c_common_v2.h
index c5f5bafe..cd311064 100644
--- a/include/libopencm3/stm32/common/i2c_common_v2.h
+++ b/include/libopencm3/stm32/common/i2c_common_v2.h
@@ -43,6 +43,9 @@ specific memorymap.h header before including this header file.*/
  * @{*/
 #define I2C1				I2C1_BASE
 #define I2C2				I2C2_BASE
+#ifdef I2C3_BASE
+#define I2C3				I2C3_BASE
+#endif
 /**@}*/
 
 /* --- I2C registers ------------------------------------------------------- */
@@ -102,6 +105,19 @@ specific memorymap.h header before including this header file.*/
 #define I2C1_TXDR			I2C_TXDR(I2C1)
 #define I2C2_TXDR			I2C_TXDR(I2C2)
 
+/* Not all parts have i2c3 */
+#ifdef I2C3_BASE
+#define I2C3_CR1			I2C_CR1(I2C3)
+#define I2C3_CR2			I2C_CR2(I2C3)
+#define I2C3_OAR1			I2C_OAR1(I2C3)
+#define I2C3_OAR2			I2C_OAR2(I2C3)
+#define I2C3_DR				I2C_DR(I2C3)
+#define I2C3_SR1			I2C_SR1(I2C3)
+#define I2C3_SR2			I2C_SR2(I2C3)
+#define I2C3_CCR			I2C_CCR(I2C3)
+#define I2C3_TRISE			I2C_TRISE(I2C3)
+#endif
+
 /* --- I2Cx_CR1 values ----------------------------------------------------- */
 
 /* PECEN: PEC enable */
diff --git a/include/libopencm3/stm32/f2/i2c.h b/include/libopencm3/stm32/f2/i2c.h
index 9c8afc94..a658c112 100644
--- a/include/libopencm3/stm32/f2/i2c.h
+++ b/include/libopencm3/stm32/f2/i2c.h
@@ -35,8 +35,6 @@ LGPL License Terms @ref lgpl_license
 
 /**@{*/
 
-#define I2C3				I2C3_BASE
-
 /**@}*/
 
 #endif
diff --git a/include/libopencm3/stm32/f3/memorymap.h b/include/libopencm3/stm32/f3/memorymap.h
index 0eead68f..53441fad 100644
--- a/include/libopencm3/stm32/f3/memorymap.h
+++ b/include/libopencm3/stm32/f3/memorymap.h
@@ -64,6 +64,7 @@
 /* PERIPH_BASE_APB1 + 0x6C00 (0x4000 6C00 - 0x4000 6FFF): Reserved */
 #define POWER_CONTROL_BASE		(PERIPH_BASE_APB1 + 0x7000)
 #define DAC_BASE			(PERIPH_BASE_APB1 + 0x7400)
+#define I2C3_BASE			(PERIPH_BASE_APB1 + 0x7800)
 /* PERIPH_BASE_APB1 + 0x7800 (0x4000 7800 - 0x4000 7FFF): Reserved */
 
 
diff --git a/include/libopencm3/stm32/f4/i2c.h b/include/libopencm3/stm32/f4/i2c.h
index 890d412f..e2a65e16 100644
--- a/include/libopencm3/stm32/f4/i2c.h
+++ b/include/libopencm3/stm32/f4/i2c.h
@@ -35,8 +35,6 @@ LGPL License Terms @ref lgpl_license
 
 /**@{*/
 
-#define I2C3				I2C3_BASE
-
 /**@}*/
 
 #endif
diff --git a/include/libopencm3/stm32/l0/memorymap.h b/include/libopencm3/stm32/l0/memorymap.h
index d1466b7d..e384c5c2 100644
--- a/include/libopencm3/stm32/l0/memorymap.h
+++ b/include/libopencm3/stm32/l0/memorymap.h
@@ -51,6 +51,7 @@
 #define CRS_BASE			(PERIPH_BASE_APB1 + 0x6C00)
 #define POWER_CONTROL_BASE		(PERIPH_BASE_APB1 + 0x7000)
 #define DAC_BASE			(PERIPH_BASE_APB1 + 0x7400)
+#define I2C3_BASE			(PERIPH_BASE_APB1 + 0x7800)
 #define LPTIM1_BASE			(PERIPH_BASE_APB1 + 0x7c00)
 
 
diff --git a/include/libopencm3/stm32/l4/i2c.h b/include/libopencm3/stm32/l4/i2c.h
index 27a0f362..033d5701 100644
--- a/include/libopencm3/stm32/l4/i2c.h
+++ b/include/libopencm3/stm32/l4/i2c.h
@@ -35,8 +35,6 @@ LGPL License Terms @ref lgpl_license
 
 /**@{*/
 
-#define I2C3				I2C3_BASE
-
 /**@}*/
 
 #endif