SYSTICK register initialization
void SysTick_Configuration(void)
{
if (SysTick_Config(SystemCoreClock / 100))
{
while (1);
}
NVIC_SetPriority(SysTick_IRQn, 0x0);
}
SysTick_Config default clock is SysTick_CLKSource_HCLK, so using SysTick_CLKSourceConfig() to select the system clock before this will not change the systick clock
static __INLINE uint32_t SysTick_Config(uint32_t ticks)
{
if (ticks > SysTick_LOAD_RELOAD_Msk) return (1);
SysTick->LOAD = (ticks & SysTick_LOAD_RELOAD_Msk) - 1;
NVIC_SetPriority (SysTick_IRQn, (1<<__NVIC_PRIO_BITS) - 1);
SysTick->VAL = 0;
SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk |
SysTick_CTRL_TICKINT_Msk |
SysTick_CTRL_ENABLE_Msk;
return (0);
}
systick interrupt service routine
void SysTick_Handler(void)
{
systime ++;
}
delay program
void delay_ms(unsigned int ms)
{
unsigned int temp;
temp = systime;
while((systime - temp) < ms);
}
void SysTick_CLKSourceConfig(uint32_t SysTick_CLKSource) is defined in misc.c file
static __INLINE uint32_t SysTick_Config(uint32_t ticks) is defined in core_cm3.h
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