Add C linkage declaration for C++ usage

include/libopencm3/stm32/f4/flash.h

@@ -115,6 +115,8 @@
 
 /* --- Function prototypes ------------------------------------------------- */
 
+BEGIN_DECLS
+
 void flash_dcache_enable(void);
 void flash_dcache_disable(void);
 void flash_icache_enable(void);
@@ -144,4 +146,6 @@ void flash_program_byte(u32 address, u8 data, u32 program_size);
 void flash_wait_for_last_operation(void);
 void flash_program_option_bytes(u32 data);
 
+END_DECLS
+
 #endif

include/libopencm3/stm32/f4/gpio.h

@@ -254,6 +254,8 @@
 
 /* --- Function prototypes ------------------------------------------------- */
 
+BEGIN_DECLS
+
 /*
  * Note: The F4 series has a completely new GPIO peripheral with different
  * configuration options. Here we implement a different API partly to more
@@ -275,4 +277,6 @@ u16 gpio_port_read(u32 gpioport);
 void gpio_port_write(u32 gpioport, u16 data);
 void gpio_port_config_lock(u32 gpioport, u16 gpios);
 
+END_DECLS
+
 #endif

include/libopencm3/stm32/f4/pwr.h

@@ -63,6 +63,10 @@ typedef enum {
 	SCALE2,
 } vos_scale_t;
 
+BEGIN_DECLS
+
 void pwr_set_vos_scale(vos_scale_t scale);
 
+END_DECLS
+
 #endif

include/libopencm3/stm32/f4/rcc.h

@@ -482,6 +482,8 @@ typedef enum {
 	PLL, HSE, HSI, LSE, LSI
 } osc_t;
 
+BEGIN_DECLS
+
 void rcc_osc_ready_int_clear(osc_t osc);
 void rcc_osc_ready_int_enable(osc_t osc);
 void rcc_osc_ready_int_disable(osc_t osc);
@@ -512,4 +514,6 @@ u32 rcc_get_system_clock_source(int i);
 void rcc_clock_setup_hse_3v3(const clock_scale_t *clock);
 void rcc_backupdomain_reset(void);
 
+END_DECLS
+
 #endif

include/libopencm3/stm32/f4/scb.h

@@ -293,10 +293,15 @@
 /* BFAR [31:0]: Bus fault address */
 
 /* --- SCB functions ------------------------------------------------------- */
+
+BEGIN_DECLS
+
 void scb_reset_core(void);
 void scb_reset_system(void);
 void scb_set_priority_grouping(u32 prigroup);
 
 /* TODO: */
 
+END_DECLS
+
 #endif

include/libopencm3/stm32/f4/timer.h

@@ -52,6 +52,10 @@
 
 /* --- Function prototypes ------------------------------------------------- */
 
+BEGIN_DECLS
+
 void timer_set_option(u32 timer_peripheral, u32 option);
 
+END_DECLS
+
 #endif