suu pen
2 Phase different signals rotational encoder library ２相位相差型ロータリーエンコーダ用ライブラリ。 絶対値パルス関数。相対値（前回読み出しからの差）パルス出力関数。秋月電子のEC12PLRGBSDVBF-D-25K-24-24C-61で動作確認した。http://akizukidenshi.com/catalog/g/gP-05773/
Dependents: RotationalEncoder_Hello
example program
Import programRotationalEncoder_Hello
RotationalEncoder library's example program
Last commit 23 Oct 2016 by 
suu pen
Diff: RotationalEncoder.cpp
- Revision:
- 1:57c43aac7007
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/RotationalEncoder.cpp Sun Oct 23 02:18:28 2016 +0000
@@ -0,0 +1,78 @@
+/**
+ * rotational encoder Library
+ */
+
+#include "RotationalEncoder.h"
+
+/**
+ *
+ */
+RotationalEncoder::RotationalEncoder(PinName channelA,
+ PinName channelB
+ ) : _channelA(channelA), _channelB(channelB)
+{
+
+ _absolutePulse = 0;
+ _relativePulse = 0;
+
+ _channelA.mode(PullUp);
+ _channelB.mode(PullUp);
+
+ _channelBLevelOfchannelALow = INITAL;
+
+ _channelA.rise(this, &RotationalEncoder::encoderAUp);
+ _channelA.fall(this, &RotationalEncoder::encoderADwon);
+
+
+}
+
+void RotationalEncoder::reset(void)
+{
+ _absolutePulse = 0;
+ _relativePulse = 0;
+ getRelativePulses();
+}
+
+
+int16_t RotationalEncoder::getAbsolutePulses(void)
+{
+
+ return _absolutePulse;
+
+}
+
+int16_t RotationalEncoder::getRelativePulses(void)
+{
+ static int16_t beforeAbsolutePulse = 0;
+ int16_t temp = _absolutePulse;
+
+ _relativePulse = temp - beforeAbsolutePulse;
+ beforeAbsolutePulse = temp;
+
+ return _relativePulse;
+
+}
+
+
+void RotationalEncoder::encoderAUp(void)
+{
+ if((_channelBLevelOfchannelALow == INITAL) ||
+ (_channelBLevelOfchannelALow == _channelB.read())
+ ) {
+ return;
+ }
+
+ if(_channelB.read() == 0) {
+ _absolutePulse++;
+
+ } else {
+ _absolutePulse--;
+
+ }
+
+}
+
+void RotationalEncoder::encoderADwon(void)
+{
+ _channelBLevelOfchannelALow = _channelB.read();
+}