86 lines
2.8 KiB
C
86 lines
2.8 KiB
C
#include "delay.h"
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#define SCS_BASE (0xE000E000UL) /*!< System Control Space Base Address */
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#define SysTick_BASE (SCS_BASE + 0x0010UL) /*!< SysTick Base Address */
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/* following defines should be used for structure members */
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#define __IM volatile const /*! Defines 'read only' structure member permissions */
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#define __OM volatile /*! Defines 'write only' structure member permissions */
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#define __IOM volatile /*! Defines 'read / write' structure member permissions */
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typedef struct
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{
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__IOM uint32_t CTRL; /*!< Offset: 0x000 (R/W) SysTick Control and Status Register */
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__IOM uint32_t LOAD; /*!< Offset: 0x004 (R/W) SysTick Reload Value Register */
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__IOM uint32_t VAL; /*!< Offset: 0x008 (R/W) SysTick Current Value Register */
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__IM uint32_t CALIB; /*!< Offset: 0x00C (R/ ) SysTick Calibration Register */
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} SysTick_Type;
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#define SysTick ((SysTick_Type *) SysTick_BASE ) /*!< SysTick configuration struct */
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//void delay_ms(unsigned int t)
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//{
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// int i;
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// for( i=0;i<t;i++)
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// {
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// int a=10300;//10300
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// while(a--);
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// }
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//}
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//void delay_us(unsigned int t)
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//{
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// int i;
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// for( i=0;i<t;i++)
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// {
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// int a=9;//9
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// while(a--);
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// }
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//}
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/******************************************************************************/
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//用于3.0或者以上库
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/******************************************************************************/
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uint8_t fac_us; //延时基数（延时一微秒所要设置的时间）
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uint16_t fac_ms;
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void delay_init(uint8_t SYSCLK)
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{
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SysTick->CTRL &= 0xfffffffb;// HCLK/8 bit2 = CLKSOURCE 选择外部时钟 0=外部时钟源 1=内核时钟源
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fac_us=SYSCLK/8;
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fac_ms=(uint16_t)fac_us*1000;
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}
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void delay_us(uint32_t nus)
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{
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uint32_t temp;
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SysTick->LOAD = nus*fac_us;//加载的时间
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SysTick->VAL = 0x00; //清空计数器
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SysTick->CTRL = 0x01; //开始倒数
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temp = SysTick->CTRL;
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while((temp&0x01)&&(!(temp&(1<<16))))temp = SysTick->CTRL;
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SysTick->CTRL=0x00; //关闭计数器
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SysTick->VAL =0X00; //清空计数器
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}
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void delay_ms(uint16_t nms)
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{
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uint32_t temp;
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SysTick->LOAD = (uint32_t)nms*fac_ms;//加载的时间
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SysTick->VAL = 0x00; //清空计数器
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SysTick->CTRL = 0x01; //开始倒数
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temp = SysTick->CTRL;
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while((temp&0x01)&&(!(temp&(1<<16)))) temp = SysTick->CTRL;
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SysTick->CTRL=0x00; //关闭计数器
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SysTick->VAL =0X00; //清空计数器
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}
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void delay_125_ns(uint8_t nns)
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{
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uint32_t temp;
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SysTick->LOAD = (uint32_t)nns;//加载的时间
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SysTick->VAL = 0x00; //清空计数器
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SysTick->CTRL = 0x01; //开始倒数
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temp = SysTick->CTRL;
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while((temp&0x01)&&(!(temp&(1<<16)))) temp = SysTick->CTRL;
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SysTick->CTRL=0x00; //关闭计数器
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SysTick->VAL =0X00; //清空计数器
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}
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