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Some improvements to systick.h+c.

This commit is contained in:
Thomas Otto 2010-04-13 22:26:07 +02:00
parent 37e71e3e5c
commit 905b5112b6
2 changed files with 60 additions and 4 deletions
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20
include/libopenstm32/systick.h
View File

@ -26,16 +26,16 @@
/* --- SYSTICK registers --------------------------------------------------- */
/* Control and status register (STK_CTRL) */
#define STK_CTRL MMIO32(SYSTICK_BASE + 0x00)
#define STK_CTRL MMIO32(SYS_TICK_BASE + 0x00)
/* reload value register (STK_LOAD) */
#define STK_LOAD MMIO32(SYSTICK_BASE + 0x04)
#define STK_LOAD MMIO32(SYS_TICK_BASE + 0x04)
/* current value register (STK_VAL) */
#define STK_VAL MMIO32(SYSTICK_BASE + 0x08)
#define STK_VAL MMIO32(SYS_TICK_BASE + 0x08)
/* calibration value register (STK_CALIB) */
#define STK_CALIB MMIO32(SYSTICK_BASE + 0x0C)
#define STK_CALIB MMIO32(SYS_TICK_BASE + 0x0C)
/* --- STK_CTRL values ----------------------------------------------------- */
/* Bits [31:17] Reserved, must be kept cleared. */
@ -44,6 +44,9 @@
/* Bits [15:3] Reserved, must be kept cleared. */
/* CLKSOURCE: Clock source selection */
#define STK_CTRL_CLKSOURCE (1 << 2)
#define STK_CTRL_CLKSOURCE_LSB 2
#define STK_CTRL_CLKSOURCE_AHB_DIV8 0
#define STK_CTRL_CLKSOURCE_AHB 1
/* TICKINT: SysTick exception request enable */
#define STK_CTRL_TICKINT (1 << 1)
/* ENABLE: Counter enable */
@ -67,4 +70,13 @@
/* --- Function Prototypes ------------------------------------------------- */
void systick_set_reload(u32 value);
u32 systick_get_value(void);
void systick_set_clocksource(u8 clocksource);
void systick_interrupt_enable(void);
void systick_interrupt_disable(void);
void systick_counter_enable(void);
void systick_counter_disable(void);
u8 systick_get_countflag(void);
#endif

44
lib/systick.c
View File

@ -19,4 +19,48 @@
#include <libopenstm32/systick.h>
void systick_set_reload(u32 value)
{
STK_LOAD = (value & 0x00FFFFFF);
}
u32 systick_get_value(void)
{
return STK_VAL;
}
void systick_set_clocksource(u8 clocksource)
{
if (clocksource < 2)
STK_CTRL |= (clocksource << STK_CTRL_CLKSOURCE_LSB);
}
void systick_interrupt_enable(void)
{
STK_CTRL |= STK_CTRL_TICKINT;
}
void systick_interrupt_disable(void)
{
STK_CTRL &= ~STK_CTRL_TICKINT;
}
void systick_counter_enable(void)
{
STK_CTRL |= STK_CTRL_ENABLE;
}
void systick_counter_disable(void)
{
STK_CTRL &= ~STK_CTRL_ENABLE;
}
u8 systick_get_countflag(void)
{
if (STK_CTRL & STK_CTRL_COUNTFLAG)
return 1;
else
return 0;
}