72 lines
2.4 KiB
C
72 lines
2.4 KiB
C
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#include "systick_delay.h"
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#include "hk32f030m.h"
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static uint32_t fac_us = 0;
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static uint32_t fac_ms = 0;
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/*******************************************************************************
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* Function Name : SysTick_Init
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* Description : SysTick Initialize
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* Input : none
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* Output : none
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* Return : none
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* Set SysTick clock source to 1/8 of HCLK
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*******************************************************************************/
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void SysTick_Init(void)
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{
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SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);
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fac_us = SystemCoreClock / 8000000;
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fac_ms = SystemCoreClock / 8000;
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}
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/*******************************************************************************
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* Function Name : SysTick_DelayUs
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* Description : delay by microseconds
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* Input : nus -- number of microseconds
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* Output : none
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* Return : none
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*******************************************************************************/
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void SysTick_DelayUs(uint32_t nus)
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{
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uint32_t temp;
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if (nus > 0)
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{
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SysTick->LOAD = nus * fac_us; // Set Reload Value
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SysTick->VAL = 0x00; // Set Current Value to 0
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SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk; // Start counter
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// Block when SysTick is running and counter flag not set
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do
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{
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temp = SysTick->CTRL;
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}
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while ((temp & SysTick_CTRL_ENABLE_Msk) && !(temp & SysTick_CTRL_COUNTFLAG_Msk));
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SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk; // Stop counter
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}
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}
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/*******************************************************************************
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* Function Name : SysTick_DelayMs
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* Description : Delay by milliseconds
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SysTick->LOAD is 24-bit so the max delay = 0xFFFFFF*8*1000 / SYSCLK
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* Input : nms -- number of milliseconds
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*******************************************************************************/
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void SysTick_DelayMs(uint16_t nms)
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{
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uint32_t temp;
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if (nms > 0)
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{
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SysTick->LOAD = nms * fac_ms; // Set Reload Value (24-bit)
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SysTick->VAL = 0x00; // Set Current Value to 0
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SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk; // Start counter
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// Block when SysTick is running and counter flag not set
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do
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{
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temp = SysTick->CTRL;
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}
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while ((temp & SysTick_CTRL_ENABLE_Msk) && !(temp & SysTick_CTRL_COUNTFLAG_Msk));
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SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk; // Stop counter
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}
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}
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