stm32學(xué)習(xí):按鍵輸入(精簡版)

ID:161768 · 發(fā)表于 2017-2-9 22:30

//GPIOA8是 LED0
//GPIOA13是 KEY0 僅包含啟動(dòng)代碼 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) //超級(jí)不精確的軟延時(shí)
{
int j;
while(i--)
{
for(j=0;j<1500;j++)
{}
}
}
int main(void)
{
u8 keyflag=1; //按鍵進(jìn)入標(biāo)志,防止一次按鍵多次判斷的簡易做法
RCC_APB2ENR= 1<<2; //打開PA時(shí)鐘,默認(rèn)啟用內(nèi)部8M時(shí)鐘
GPIOA_CRH &= 0XFFFFFFF0; //準(zhǔn)備配置PA8 ,PA8是LED0
GPIOA_CRH |= 0X00000003; //PA8 推挽輸出
GPIOA_ODR |= 1<<8; //PA8 輸出高,即先關(guān)閉led
GPIOA_CRH &= 0XFF0FFFFF; //準(zhǔn)備配置PA13 ,PA13是KEY0
GPIOA_CRH |= 0X00800000; //配置PA13為帶上拉下拉輸入
while(1)
{
if(!checkBit(GPIOA_IDR,13)) //鍵被按下的話,執(zhí)行l(wèi)ed反轉(zhuǎn)
{
if(keyflag)
{
keyflag=0;
GPIOA_ODR = revBit(GPIOA_ODR,8); //第8位反轉(zhuǎn),revBit是宏
}
}
else
{
keyflag=1;
}
delay(10); //簡易消抖
}
}
//checkBit 和revBit都是關(guān)于位的宏
//#define BIT(n) (1<<(n))
//#define revBit(val,n) ((val)^(BIT(n)))
//#define checkBit(val,n) (((val)&(BIT(n)))>>(n))

復(fù)制代碼

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