99 lines
2.3 KiB
C
99 lines
2.3 KiB
C
#include "delay.h"
|
||
#include "main.h"
|
||
#include "tim.h"
|
||
#include "app.h"
|
||
|
||
|
||
static uint8_t fac_us=0; //us延时倍乘数
|
||
//static uint16_t fac_ms=0; //ms延时倍乘数,在ucos下,代表每个节拍的ms数
|
||
#define SysTick_CLKSource_HCLK_Div8 ((uint32_t)0xFFFFFFFB)
|
||
#define SysTick_CLKSource_HCLK ((uint32_t)0x00000004)
|
||
|
||
//#define IS_SYSTICK_CLK_SOURCE(SOURCE) (((SOURCE) == SysTick_CLKSource_HCLK) || \
|
||
// ((SOURCE) == SysTick_CLKSource_HCLK_Div8))
|
||
|
||
extern void SysTick_CLKSourceConfig(uint32_t SysTick_CLKSource);
|
||
|
||
//初始化延迟函数
|
||
//当使用OS的时候,此函数会初始化OS的时钟节拍
|
||
//SYSTICK的时钟固定为HCLK时钟的1/8
|
||
//SYSCLK:系统时钟
|
||
void delay_init()
|
||
{
|
||
#if SYSTEM_SUPPORT_OS //如果需要支持OS.
|
||
u32 reload;
|
||
#endif
|
||
SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8); //选择外部时钟 HCLK/8
|
||
fac_us=SystemCoreClock/8000000; //为系统时钟的1/8
|
||
#if SYSTEM_SUPPORT_OS //如果需要支持OS.
|
||
reload=SystemCoreClock/8000000; //每秒钟的计数次数 单位为M
|
||
reload*=1000000/delay_ostickspersec; //根据delay_ostickspersec设定溢出时间
|
||
//reload为24位寄存器,最大值:16777216,在72M下,约合1.86s左右
|
||
fac_ms=1000/delay_ostickspersec; //代表OS可以延时的最少单位
|
||
|
||
SysTick->CTRL|=SysTick_CTRL_TICKINT_Msk; //开启SYSTICK中断
|
||
SysTick->LOAD=reload; //每1/delay_ostickspersec秒中断一次
|
||
SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk; //开启SYSTICK
|
||
|
||
#else
|
||
// fac_ms=(uint16_t)fac_us*1000; //非OS下,代表每个ms需要的systick时钟数
|
||
#endif
|
||
}
|
||
|
||
|
||
void delay_10ms(int tm)//延时tm*10 ms
|
||
{
|
||
it_10ms_flag = 0;
|
||
while( tm > 0 )
|
||
{
|
||
if(it_10ms_flag == 1)
|
||
{
|
||
it_10ms_flag = 0;
|
||
tm--;
|
||
}
|
||
}
|
||
}
|
||
|
||
//int ts = 33;
|
||
//void delay_us(int tm) //stm32 72MHz 执行一条指令所需时间为 11~100ns，按照30ns算
|
||
//{
|
||
// int i = 0,j = 0;
|
||
// for(i = 0;i < tm;i++)
|
||
// {
|
||
// for(j = 0;j < ts;j++);
|
||
// }
|
||
//}
|
||
|
||
void delay_us(uint32_t nus)
|
||
{
|
||
uint32_t temp;
|
||
SysTick->LOAD=nus*fac_us; //时间加载
|
||
SysTick->VAL=0x00; //清空计数器
|
||
SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ; //开始倒数
|
||
do
|
||
{
|
||
temp=SysTick->CTRL;
|
||
}while((temp&0x01)&&!(temp&(1<<16))); //等待时间到达
|
||
SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk; //关闭计数器
|
||
SysTick->VAL =0X00; //清空计数器
|
||
}
|
||
|
||
void delay_ns(int tm)
|
||
{
|
||
int i = 0;
|
||
for(i = 0;i < tm;i++)
|
||
{
|
||
}
|
||
}
|
||
|
||
void delay(unsigned long count)
|
||
{
|
||
while(count--)
|
||
__NOP();
|
||
|
||
}
|
||
|
||
|
||
|
||
|