Diff: mRotaryEncoder.cpp

Revision:

0:562943b05e99

Child:

2:f99ac9745a2c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mRotaryEncoder.cpp	Mon Nov 29 21:25:13 2010 +0000
@@ -0,0 +1,80 @@
+#include "mbed.h"
+#include "mRotaryEncoder.h"
+
+
+mRotaryEncoder::mRotaryEncoder(PinName pinA, PinName pinB, PinName pinSW, PinMode pullMode, int debounceTime_us) {
+    m_pinA = new InterruptIn(pinA);                    // interrrupts on pinA
+    m_pinB = new DigitalIn(pinB);                      // only digitalIn for pinB
+
+    //set pins with internal PullUP-default
+    m_pinA->mode(pullMode);
+    m_pinB->mode(pullMode);
+
+    // attach interrrupts on pinA
+    m_pinA->rise(this, &mRotaryEncoder::rise);
+    m_pinA->fall(this, &mRotaryEncoder::fall);
+
+    // Switch on pinSW
+    m_pinSW = new InterruptIn(pinSW);                 // interrupt on press switch
+    m_pinSW->mode(pullMode);
+
+    m_position = 0;
+
+    m_debounceTime_us = debounceTime_us;
+}
+
+mRotaryEncoder::~mRotaryEncoder() {
+    delete m_pinA;
+    delete m_pinB;
+    delete m_pinSW;
+}
+
+int mRotaryEncoder::Get(void) {
+    return m_position;
+}
+
+
+
+void mRotaryEncoder::Set(int value) {
+    m_position = value;
+}
+
+
+void mRotaryEncoder::fall(void) {
+    //no interrupts
+    m_pinA->rise(NULL);
+    m_pinA->fall(NULL);
+    wait_us(m_debounceTime_us);            // wait while switch is bouncing
+    //pinA still low?
+    if (*m_pinA == 0) {
+        if (*m_pinB == 1) {
+            m_position++;
+        } else {
+            m_position--;
+        }
+    }
+    //reenable interrupts
+    m_pinA->rise(this, &mRotaryEncoder::rise);
+    m_pinA->fall(this, &mRotaryEncoder::fall);
+    rotIsr.call();                        // call the isr for rotation
+}
+
+void mRotaryEncoder::rise(void) {
+    //no interrupts
+    m_pinA->rise(NULL);
+    m_pinA->fall(NULL);
+    wait_us(m_debounceTime_us);            // wait while switch is bouncing
+    //pinA still high?
+    if (*m_pinA == 1) {
+        if (*m_pinB == 1) {
+            m_position--;
+        } else {
+            m_position++;
+        }
+    }
+    //reenable interrupts
+    m_pinA->rise(this, &mRotaryEncoder::rise);
+    m_pinA->fall(this, &mRotaryEncoder::fall);
+    rotIsr.call();                        // call the isr for rotation
+}
+