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/*
File Name : yc_systick.c
Author : Yichip
Version : V1.0
Date : 2018/03/27
Description : systick encapsulation.
*/
#include "yc_systick.h"
tick SystickCount;
void Systick_Dealy_Ms(uint32_t MS)
{
uint32_t ReloadValue;
ReloadValue = MS * 9600;
*SYSTICK_CSR &= ~(((uint32_t)1) << SYSTICK_CSR_ENABLE);
*SYSTICK_RVR = ReloadValue; //Set the reload value
*SYSTICK_CVR = 0; //clear the current value
*SYSTICK_CSR |= ((SYSTICK_SYSCLOCK << SYSTICK_CSR_CLKSOURCE) | (1 << SYSTICK_CSR_ENABLE));
while (!(*SYSTICK_CVR == 0));
*SYSTICK_RVR = 0;
}
uint32_t SysTick_Config(uint32_t ReloadValue)
{
ReloadValue -= 1;
if (!IS_RELOAD_VALUE(ReloadValue))
return 1;
*SYSTICK_CSR &= ~(((uint32_t)1) << SYSTICK_CSR_ENABLE);
*SYSTICK_RVR = ReloadValue; //Set the reload value
*SYSTICK_CVR = 0; //clear the current value
SystickCount = 0; // Reset the overflow counter
*SYSTICK_CSR |=
((SYSTICK_SYSCLOCK << SYSTICK_CSR_CLKSOURCE) |
(1 << SYSTICK_CSR_ENABLE) |
(1 << SYSTICK_CSR_TICKINT));
return 0;
}
tick SysTick_GetTick()
{
return SystickCount;
}
Boolean SysTick_IsTimeOut(tick start_tick, int interval)
{
start_tick = SysTick_GetTick() - start_tick;
if (start_tick < 0)
start_tick += TICK_MAX_VALUE;
if (((start_tick * (*SYSTICK_RVR)) / (CPU_MHZ / 1000)) >= interval)
{
return TRUE;
}
else
{
return FALSE;
}
}
uint32_t SysTick_GetRelativeTime(tick start_tick)
{
start_tick = SysTick_GetTick() - start_tick;
if (start_tick < 0)
start_tick += TICK_MAX_VALUE;
return ((start_tick * (*SYSTICK_RVR)) / (CPU_MHZ / 1000));
}
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