stm32f3: adding external interrupts support.

include/libopencm3/stm32/exti.h

@@ -32,6 +32,17 @@
 #define EXTI_SWIER			MMIO32(EXTI_BASE + 0x10)
 #define EXTI_PR				MMIO32(EXTI_BASE + 0x14)
 
+#if defined (STM32F3)
+
+#define EXTI_IMR2			MMIO32(EXTI_BASE + 0x18)
+#define EXTI_EMR2			MMIO32(EXTI_BASE + 0x1C)
+#define EXTI_RTSR2			MMIO32(EXTI_BASE + 0x20)
+#define EXTI_FTSR2			MMIO32(EXTI_BASE + 0x24)
+#define EXTI_SWIER2			MMIO32(EXTI_BASE + 0x28)
+#define EXTI_PR2			MMIO32(EXTI_BASE + 0x2C)
+
+#endif
+
 /* EXTI number definitions */
 #define EXTI0				(1 << 0)
 #define EXTI1				(1 << 1)
@@ -53,10 +64,15 @@
 #define EXTI17				(1 << 17)
 #define EXTI18				(1 << 18)
 #define EXTI19				(1 << 19)
+
+#if !defined(STM32F3)
+
 #define EXTI20				(1 << 20)
 #define EXTI21				(1 << 21)
 #define EXTI22				(1 << 22)
 
+#endif
+
 /* Trigger types */
 typedef enum trigger_e {
 	EXTI_TRIGGER_RISING,

lib/stm32/exti2.c

@@ -25,6 +25,8 @@
 #include <libopencm3/stm32/syscfg.h>
 #if defined(STM32F2)
 #include <libopencm3/stm32/f2/gpio.h>
+#elif defined(STM32F3)
+#include <libopencm3/stm32/f3/gpio.h>
 #elif defined(STM32F4)
 #include <libopencm3/stm32/f4/gpio.h>
 #elif defined(STM32L1)
@@ -141,23 +143,25 @@ void exti_select_source(uint32_t exti, uint32_t gpioport)
 	case GPIOE:
 		bits = 0xb;
 		break;
-#if defined(STM32L1)
-#else
+#if !defined(STM32L1)
 	case GPIOF:
 		bits = 0xa;
 		break;
+#if !defined(STM32F3)
 	case GPIOG:
 		bits = 0x9;
 		break;
 #endif
+#endif
+#if !defined(STM32F3)
 	case GPIOH:
 		bits = 0x8;
 		break;
-#if defined(STM32L1)
-#else
+#if !defined(STM32L1)
 	case GPIOI:
 		bits = 0x7;
 		break;
+#endif
 #endif
 	}
 

lib/stm32/f3/Makefile

@@ -34,7 +34,7 @@ CFLAGS		= -Os -g \
 # ARFLAGS	= rcsv
 ARFLAGS		= rcs
 
-OBJS		= rcc.o gpio.o flash.o adc.o
+OBJS		= rcc.o gpio.o flash.o adc.o exti2.o
 
 OBJS            += gpio_common_all.o gpio_common_f234.o i2c_common_all.o\
 		   dac_common_all.o