Delay_ns_us_ms.c

uint32_t counter_1ms;


void Delay_ns(__IO uint32_t nCount) 
{
	 while(nCount--) 
 	{
  }
}

void Delay_us(__IO uint32_t nCount) 
{
	 while(nCount--) 
 	{
		Delay_ns(35);
  }
}

void __delay_ms(uint32_t ms) 
{
	counter_1ms = 0;	
  while(counter_1ms < ms);
}
void System_Init(void) 
{

    //cau hinh systick
    SysTick_Config(SystemCoreClock/1000);
    //cau hinh 1ms ngat 1 lan
}