用了好久delay20ms的按键消抖,觉得很不爽!8 I. Z F, J0 E% S 我这么牛B的工程师怎么能用delay呢!( z5 [: v3 ^3 d ~2 w) B0 x' @+ E 于是手撸一个无延迟的按键消抖.! L3 b: i$ P! V& e3 l " }4 b: h: [( E6 q* d #define KEY2 GPIOE, 4 uint32_t Key2Level, Key2Tick; ! p( o) Y2 f6 T5 n- z$ y) r$ b int main() {. G. d8 H; o$ T: ?$ g0 j& v, ^ Tick_Init(); // Tick是开机以来的微秒数 IO_Config(KEY2, IO_IN_PU);' d( {* O' i3 y. a4 {* R& }% a EXTI_Config(KEY2, EXTI_RISING|EXTI_FALLING);) f: m# F( R( O7 E. l Key2Level = IO_IN(KEY2);6 l* G2 z( s8 \' O NVIC_EnableIRQ(EXTI4_IRQn);; Z5 X) f0 |9 V( R5 y for (;;);5 J$ k" R, v4 ?" U } u) t$ [- b9 Q% b 2 f5 Y1 {; ]9 ?8 V& B( O int n; $ V) q$ y' |8 K5 A7 m ISR(EXTI4_IRQn) { if (Key2Level && Tick - Key2Tick > 10000) {6 o4 d S4 I; S. B7 v5 I n++; // 做你喜欢做的事9 k% O4 W ]$ c+ x* o }8 ]! U9 R# j) s4 W: m1 ~2 P EXTI_ClearFlag(KEY2); Key2Level = IO_IN(KEY2); Key2Tick = Tick; } " [$ S4 A- h- r7 k' n- U . M' Y' j( A! n8 u& F* ~9 c |