Revision 1:b9fb662cca1d, committed 2018-05-08

Comitter:

brainliang

Date:

Tue May 08 01:19:07 2018 +0000

Parent:

0:5c2ad81551aa

Child:

2:3753789f4288

Commit message:

fads

Changed in this revision

--- a/QEI.cpp	Thu Sep 02 16:48:55 2010 +0000
+++ b/QEI.cpp	Tue May 08 01:19:07 2018 +0000
@@ -191,6 +191,11 @@
 
 }
 
+//获取旋转方向函数
+int QEI::getState(void)
+{
+    return state_;
+}
 // +-------------+
 // | X2 Encoding |
 // +-------------+
@@ -249,14 +254,14 @@
         //11->00->11->00 is counter clockwise rotation or "forward".
         if ((prevState_ == 0x3 && currState_ == 0x0) ||
                 (prevState_ == 0x0 && currState_ == 0x3)) {
-
+            state_ = 1;
             pulses_++;
 
         }
         //10->01->10->01 is clockwise rotation or "backward".
         else if ((prevState_ == 0x2 && currState_ == 0x1) ||
                  (prevState_ == 0x1 && currState_ == 0x2)) {
-
+            state_ = -1;
             pulses_--;
 
         }
@@ -271,6 +276,11 @@
 
             if (change == 0) {
                 change = -1;
+                state_ = -1;
+            }
+            else 
+            {
+                state_ = 1;
             }
 
             pulses_ -= change;

--- a/QEI.h	Thu Sep 02 16:48:55 2010 +0000
+++ b/QEI.h	Tue May 08 01:19:07 2018 +0000
@@ -207,7 +207,8 @@
      * @return Number of revolutions which have occured on the index channel.
      */
     int getRevolutions(void);
-
+    
+    int getState(void);
 private:
 
     /**
@@ -235,7 +236,8 @@
     int          pulsesPerRev_;
     int          prevState_;
     int          currState_;
-
+    int          state_; 
+    
     volatile int pulses_;
     volatile int revolutions_;