Revision 8:8bb311d39a99, committed 2017-03-02

Comitter:

natuga117

Date:

Thu Mar 02 18:01:45 2017 +0000

Parent:

7:4a171a80f085

Commit message:

improved precision

Changed in this revision

diff -r 4a171a80f085 -r 8bb311d39a99 SonicDist.cpp
--- a/SonicDist.cpp	Sat Oct 08 22:15:39 2016 +0000
+++ b/SonicDist.cpp	Thu Mar 02 18:01:45 2017 +0000
@@ -6,6 +6,7 @@
     echo=new InterruptIn(Echo);
     soundspeed=340;
     startflag=false;
+    NoiseCheckFlag=false;
     dist=-1;//まだ未測定時かどうかの判定用にdistはありえない値（負の値を代入しておく）
     trig->write(1);
     echo->rise( this, &SonicDist::StartMeasure );
@@ -13,29 +14,38 @@
 }
 void SonicDist::StartMeasure(void)
 {
-    if(startflag) {
+    if(startflag && NoiseCheckFlag==false) {
         echotime.reset();
-        echotime.start();
+    }else{
+        Postponement.detach();
     }
 }
 void SonicDist::endMeasure(void)
 {
     if(dist!=-1&& startflag) {
-        echotime.stop();
-        dist=echotime.read()*soundspeed*1000/2;//mmで出力
+        distbuf=echotime.read()*soundspeed*1000/2;//mmで出力
+        if(distbuf<10){distbuf=dist;}//立ち上がりノイズと判定
         startflag=false;
+        NoiseCheckFlag=true;
+        Postponement.attach(this,&SonicDist::FallNoiseCheck,0.04);
     }
 }
+
+void SonicDist::FallNoiseCheck(void)//ここに到達すると立下りのノイズではないと判定される
+{
+    dist=distbuf;
+    NoiseCheckFlag=false;
+}
+void SonicDist::Init(void)
+{
+    echotime.start();
+    pulse.attach(this,&SonicDist::setTrig,0.05);
+    dist=-2;
+}
 void SonicDist::setTrig(void)
 {
-    if(startflag)dist=3000;
     startflag=true;
-    trig->write(0);
-    systime.attach(this,&SonicDist::releaseTrig, 0.000010);
-}
-void SonicDist::releaseTrig(void)
-{
-    trig->write(1);
+    trig->write(!trig->read());
 }
 double SonicDist::read(void)
 {
@@ -52,8 +62,7 @@
 double SonicDist::takeDist(void)
 {
     if(dist==-1) {
-        pulse.attach(this,&SonicDist::setTrig,0.05);
-        dist=-2;
+        SonicDist::Init();
     }
     return (double)dist/10;
 }
\ No newline at end of file

diff -r 4a171a80f085 -r 8bb311d39a99 SonicDist.h
--- a/SonicDist.h	Sat Oct 08 22:15:39 2016 +0000
+++ b/SonicDist.h	Thu Mar 02 18:01:45 2017 +0000
@@ -11,18 +11,22 @@
         double read(void);
         double read_mm(void);
         double takeDist(void);
+        void Init(void);
     private:
         void releaseTrig(void);
         void setTrig(void);
         void endMeasure(void);
+        void FallNoiseCheck(void);//立ち下がりノイズの判定
         void StartMeasure(void);
         double soundspeed;//音速
         bool startflag;
-        Timeout systime;
         Ticker pulse;
+        Timeout Postponement;//ノイズ判定を行うための割り込み
         DigitalOut* trig;
         InterruptIn* echo;
         Timer echotime;
+        int distbuf;//仮格納距離(mm)
+        bool NoiseCheckFlag;//ノイズチェックが終了しているかの判定用
         int dist;//距離(mm)
 };
 #endif