arduino宏的应用实例4--用宏实现边沿检测（转）
取自前面帖子中的按键检测：直接上代码：//逻辑量的四种状态：低，上升，高，下降
enum edgeSta {low, trg, high, pop};
//宏名:edge。 返回值：逻辑量状态。输入参数：bool值 用途：检测逻辑量的边沿。
#define edge(ReadData) ({\
static bool Trg = false;\
static bool Cont = false;\
static bool Pop = false;\
Trg = ReadData & (ReadData ^ Cont); \
Pop = Cont != ReadData & !Trg; \
Cont = ReadData; \
enum edgeSta sta = low;\
if (Cont) {\
sta = high;\
} else {\
sta = low;\
}\
if (Trg) {\
sta = trg;\
}\
if (Pop) {\
sta = pop;\
}\
sta;\
})
//宏名：timer。返回值:bool 时间到返回真。参数:enable使能，startTime第一次执行时间，delayTime执行间隔时间，doSomeThing任意表达式到时间执行的任务。
#define timer(enable,startTime,delayTime,doSomeThing) ({\
static unsigned long timsta = millis();\
static unsigned long tim = startTime;\
bool ret = false;\
if(!enable){timsta = millis();tim = startTime;}else{\
if (millis() - timsta>= tim){\
doSomeThing;\
ret = true;\
timsta = millis(); \
tim = delayTime;\
}\
}\
ret;\
})
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
pinMode(8, INPUT_PULLUP);
}
//检测8号端口按键的状态
void fun1() {
enum edgeSta a = edge(!digitalRead(8));
switch (a)
{
case low:
//Serial.println("low");
break;
case trg:
Serial.println("trg");
break;
case high:
//Serial.println("high");
break;
default:
Serial.println("pop");
}
}
void loop() {
// put your main code here, to run repeatedly:
//联合使用定时器和边沿检测处理按键状态。
timer(true, 0, 20, fun1());
}
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