78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
#include "includes.h"
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volatile u32 Systick_TickCount = 0;
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void SysTick_Handler(void)
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{
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Systick_TickCount++;
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// if(Systick_TickCount % 10 == 0)
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// printf("#");
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}
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u32 GetDelayTick(u32 ms)
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{
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return GetTickCount() + ms;
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}
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// 考虑了u32溢出翻转的情况
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u8 IsTickOut(u32 OutTick)
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{
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u32 tick = GetTickCount();
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if(tick > OutTick)
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{
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if(tick - OutTick > 0x80000000UL)
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return 0;
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return 1;
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}
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if(OutTick - tick > 0x80000000UL)
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return 1;
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return 0;
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}
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// 考虑了u32溢出翻转的情况
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u32 GetTickElapse(u32 start_tick, u32 end_tick)
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{
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if(end_tick >= start_tick)
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return (end_tick - start_tick);
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return (0xFFFFFFFFUL - start_tick + end_tick);
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}
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// 这个函数必须在初始化完成，中断开启以后才有效
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void delay_ms(u32 ms)
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{
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u32 tick = GetDelayTick(ms);
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do
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{
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} while(!IsTickOut(tick));
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}
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// 通过TMR2来产生1ms中断
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void Clock_Init()
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{
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u32 us = CyclesPerUs * 1000; // 1ms
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if ((us - 1UL) > SysTick_LOAD_RELOAD_Msk)
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return; /* Reload value impossible */
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SysTick->LOAD = (uint32_t)(us - 1UL); /* set reload register */
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NVIC_SetPriority (SysTick_IRQn, 0); /* set Priority for Systick Interrupt */
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SysTick->VAL = 0UL; /* Load the SysTick Counter Value */
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SysTick->CTRL |= (SysTick_CTRL_CLKSOURCE_Msk |
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SysTick_CTRL_TICKINT_Msk |
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SysTick_CTRL_ENABLE_Msk); /* Enable SysTick IRQ and SysTick Timer */
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}
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void delay_us(uint16_t us)
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{
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uint32_t j;
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while(us--)
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{
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j = SystemCoreClock / 1000000;
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while(j--);
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}
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}
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