11. [Learning LPC1768 library functions] Systick experiment

cxmdz

11. [Learning LPC1768 library functions] Systick experiment [Copy link]

The system tick timer is an important part of the Cortex-M3 . The system tick timer is designed to provide 10 millisecond interval interrupts for the operating system or other system management software . Because the system tick timer is part of the Cortex-M3 , it is easy to port software by providing a standard timer that can be used in Cortex-M3 core devices .

/************************************************************************        
** 函数名:void SysTick_Init(uint8_t time)
** 函数功能: systick初始化
** 输入参数: time 定时时间(ms)
** 输出参数: 无                
** 返回值:无        
************************************************************************/ 
void SysTick_Init(uint8_t time){
                

        SysTick_Config(SystemCoreClock/1000*time); //系统时钟/1000  

}

/************************************************************************        
** 函数名:void delay_us(uint32_t MS)
** 函数功能: 毫秒延时函数
** 输入参数: 毫秒 
** 输出参数: 无                
** 返回值:无        
************************************************************************/ 
void Delay_ms(uint32_t MS){
        
                
unsigned long systickcnt;
  systickcnt = SysTickCnt;
  while ((SysTickCnt - systickcnt) < MS);
        
}

void SysTick_Handler(void)
{

        
  SysTickCnt++;
        SysTick->CTRL &= ~(1<<16);

}

【11】LPC1768_SYSTICK实验.rar (251.73 KB, downloads: 9)

2019-8-3 15:11 上传

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