- //GPIOA8是 LED0
- //GPIOA13是 KEY0 仅包含启动代码 STM32F10x.s
-
- #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)
- {
- u8 keyflag=1; //按键进入标志,防止一次按键多次判断的简易做法
-
- 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PA8 ,PA8是LED0
- GPIOA_CRH |= 0X00000003; //PA8 推挽输出
- GPIOA_ODR |= 1<<8; //PA8 输出高,即先关闭led
-
- GPIOA_CRH &= 0XFF0FFFFF; //准备配置PA13 ,PA13是KEY0
- GPIOA_CRH |= 0X00800000; //配置PA13为带上拉下拉输入
-
-
- while(1)
- {
- if(!checkBit(GPIOA_IDR,13)) //键被按下的话,执行led反转
- {
- if(keyflag)
- {
- keyflag=0;
- GPIOA_ODR = revBit(GPIOA_ODR,8); //第8位反转,revBit是宏
- }
- }
- else
- {
- keyflag=1;
- }
-
- delay(10); //简易消抖
- }
- }
-
-
- //checkBit 和revBit都是关于位的宏
- //#define BIT(n) (1<<(n))
- //#define revBit(val,n) ((val)^(BIT(n)))
- //#define checkBit(val,n) (((val)&(BIT(n)))>>(n))
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