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#include "SWM221.h"
int main(void)
{
SystemInit();
GPIO_Init(GPIOA, PIN5, 1, 0, 0, 0); //输出，接LED
SysTick_Config(SystemCoreClock/4); //每0.25秒钟触发一次中断
while(1==1)
}
void SysTick_Handler(void)
GPIO_InvBit(GPIOA, PIN5); //反转LED亮灭状态