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提交裸机版工程

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ldz 2024-09-06 17:10:09 +08:00
parent 0e839fdba3
commit b0e72aa6df
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软件/mouse_paw3395/MyCode/Delay.c Normal file
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#include "delay.h"
#define SCS_BASE (0xE000E000UL) /*!< System Control Space Base Address */
#define SysTick_BASE (SCS_BASE + 0x0010UL) /*!< SysTick Base Address */
/* following defines should be used for structure members */
#define __IM volatile const /*! Defines 'read only' structure member permissions */
#define __OM volatile /*! Defines 'write only' structure member permissions */
#define __IOM volatile /*! Defines 'read / write' structure member permissions */
typedef struct
{
__IOM uint32_t CTRL; /*!< Offset: 0x000 (R/W) SysTick Control and Status Register */
__IOM uint32_t LOAD; /*!< Offset: 0x004 (R/W) SysTick Reload Value Register */
__IOM uint32_t VAL; /*!< Offset: 0x008 (R/W) SysTick Current Value Register */
__IM uint32_t CALIB; /*!< Offset: 0x00C (R/ ) SysTick Calibration Register */
} SysTick_Type;
#define SysTick ((SysTick_Type *) SysTick_BASE ) /*!< SysTick configuration struct */
//void delay_ms(unsigned int t)
//{
// int i;
// for( i=0;i<t;i++)
// {
// int a=10300;//10300
// while(a--);
// }
//}
//void delay_us(unsigned int t)
//{
// int i;
// for( i=0;i<t;i++)
// {
// int a=9;//9
// while(a--);
// }
//}
/******************************************************************************/
//用于3.0或者以上库
/******************************************************************************/
uint8_t fac_us; //延时基数（延时一微秒所要设置的时间）
uint16_t fac_ms;
void delay_init(uint8_t SYSCLK)
{
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
fac_us=SYSCLK/8;
fac_ms=(uint16_t)fac_us*1000;
}
void delay_us(uint32_t nus)
{
uint32_t temp;
SysTick->LOAD = nus*fac_us;//加载的时间
SysTick->VAL = 0x00; //清空计数器
SysTick->CTRL = 0x01; //开始倒数
temp = SysTick->CTRL;
while((temp&0x01)&&(!(temp&(1<<16))))temp = SysTick->CTRL;
SysTick->CTRL=0x00; //关闭计数器
SysTick->VAL =0X00; //清空计数器
}
void delay_ms(uint16_t nms)
{
uint32_t temp;
SysTick->LOAD = (uint32_t)nms*fac_ms;//加载的时间
SysTick->VAL = 0x00; //清空计数器
SysTick->CTRL = 0x01; //开始倒数
temp = SysTick->CTRL;
while((temp&0x01)&&(!(temp&(1<<16)))) temp = SysTick->CTRL;
SysTick->CTRL=0x00; //关闭计数器
SysTick->VAL =0X00; //清空计数器
}
void delay_125_ns(uint8_t nns)
{
uint32_t temp;
SysTick->LOAD = (uint32_t)nns;//加载的时间
SysTick->VAL = 0x00; //清空计数器
SysTick->CTRL = 0x01; //开始倒数
temp = SysTick->CTRL;
while((temp&0x01)&&(!(temp&(1<<16)))) temp = SysTick->CTRL;
SysTick->CTRL=0x00; //关闭计数器
SysTick->VAL =0X00; //清空计数器
}