From 76e8745d80a822d9ae9a017c8f68a2f7f20695fc Mon Sep 17 00:00:00 2001 From: Michael Hope Date: Sun, 10 Oct 2010 19:58:58 +1300 Subject: Make systick.h C++ safe. Expose the sys tick count via systick.h and remove other externs. --- libmaple/systick.c | 5 ++--- libmaple/systick.h | 9 ++++++--- 2 files changed, 8 insertions(+), 6 deletions(-) (limited to 'libmaple') diff --git a/libmaple/systick.c b/libmaple/systick.c index 12a3e22..2b09a64 100644 --- a/libmaple/systick.c +++ b/libmaple/systick.c @@ -39,7 +39,7 @@ #define SYSTICK_TICKINT BIT(1) // Interrupt on systick countdown #define SYSTICK_ENABLE BIT(0) // Turn on the counter -volatile uint32 systick_timer_millis = 0; +volatile uint32 systick_timer_millis; void systick_init(uint32 reload_val) { /* Set the reload counter to tick every 1ms */ @@ -65,8 +65,7 @@ void systick_resume() { SYSTICK_TICKINT); } +/** SysTick interrupt handler. Bumps up the tick counter. */ void SysTickHandler(void) { systick_timer_millis++; } - - diff --git a/libmaple/systick.h b/libmaple/systick.h index 7ec8497..ae1268a 100644 --- a/libmaple/systick.h +++ b/libmaple/systick.h @@ -33,14 +33,17 @@ #include "libmaple.h" +#ifdef __cplusplus +extern "C"{ +#endif + #define SYSTICK_CSR 0xE000E010 // Control and status register #define SYSTICK_CNT 0xE000E018 // Current value register #define SYSTICK_CSR_COUNTFLAG BIT(16) -#ifdef __cplusplus -extern "C"{ -#endif +/** System elapsed time in milliseconds */ +volatile uint32 systick_timer_millis; void systick_init(uint32 reload_val); void systick_disable(); -- cgit v1.2.3