stm32学习:点亮一个led (精简版) -

#define GPIOA_CRL (*(volatile unsigned long *)(0x40000000+0x10000+0x0800+0x00))
#define GPIOA_CRH (*(volatile unsigned long *)(0x40000000+0x10000+0x0800+0x04))
#define GPIOA_IDR (*(volatile unsigned long *)(0x40000000+0x10000+0x0800+0x08))
#define GPIOA_ODR (*(volatile unsigned long *)(0x40000000+0x10000+0x0800+0x0C))
#define RCC_APB2ENR (*(volatile unsigned long *)(0x40000000+0x20000+0x1000+0x18))
void delay(unsigned long i) //超级不精确的软延时
{
int j;
while(i--)
{
for(j=0;j<1500;j++)
{}
}
}
int main(void)
{
RCC_APB2ENR = 1<<2; //打开PA时钟,默认启用内部8M时钟
GPIOA_CRH &= 0XFFFFFFF0; //准备配置PA
GPIOA_CRH |= 0X00000003; //PA8 推挽输出
GPIOA_ODR |= 1<<8; //PA8 输出高,即先关闭led
while(1)
{
GPIOA_ODR &= 0<<8;
delay(3000);
GPIOA_ODR |= 1<<8;
delay(3000);
}
}

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