Ny structure. Start of the "main" branch

Cards/EaserCAT-2000/Firmware/src/MyEncoder.cpp

@@ -0,0 +1,99 @@
+#include "MyENcoder.h"
+
+MyEncoder::MyEncoder(TIM_TypeDef *_tim_base, uint8_t _indexPin, void irq(void))
+{
+    tim_base = _tim_base;
+    indexPin = _indexPin;
+    attachInterrupt(digitalPinToInterrupt(indexPin), irq, RISING); // When Index triggered
+    EncoderInit.SetCount(0);
+}
+
+#define ONE_PERIOD 65536
+#define HALF_PERIOD 32768
+
+int64_t MyEncoder::unwrapEncoder(uint16_t in)
+{
+    int32_t c32 = (int32_t)in - HALF_PERIOD;           // remove half period to determine (+/-) sign of the wrap
+    int32_t dif = (c32 - previousEncoderCounterValue); // core concept: prev + (current - prev) = current
+
+    // wrap difference from -HALF_PERIOD to HALF_PERIOD. modulo prevents differences after the wrap from having an incorrect result
+    int32_t mod_dif = ((dif + HALF_PERIOD) % ONE_PERIOD) - HALF_PERIOD;
+    if (dif < -HALF_PERIOD)
+        mod_dif += ONE_PERIOD; // account for mod of negative number behavior in C
+
+    int64_t unwrapped = previousEncoderCounterValue + mod_dif;
+    previousEncoderCounterValue = unwrapped; // load previous value
+
+    return unwrapped + HALF_PERIOD; // remove the shift we applied at the beginning, and return
+}
+
+void MyEncoder::indexPulse(void)
+{
+    if (pleaseZeroTheCounter)
+    {
+        tim_base->CNT = 0;
+        indexPulseFired = 1;
+        Pos.clear();
+        TDelta.clear();
+        pleaseZeroTheCounter = 0;
+    }
+}
+
+uint8_t MyEncoder::indexHappened()
+{
+    if (indexPulseFired)
+    {
+        indexPulseFired = 0;
+        previousEncoderCounterValue = 0;
+        return 1;
+    }
+    return 0;
+}
+
+double MyEncoder::currentPos()
+{
+    curPos = unwrapEncoder(tim_base->CNT) * PosScaleRes;
+    return curPos;
+}
+
+double MyEncoder::frequency(uint64_t time)
+{
+
+    double diffT = 0;
+    double diffPos = 0;
+    double frequency;
+    TDelta.push(time); // Running average over the length of the circular buffer
+    Pos.push(curPos);
+    if (Pos.size() == RINGBUFFERLEN)
+    {
+        diffT = 1.0e-6 * (TDelta.last() - TDelta.first()); // Time is in microseconds
+        diffPos = fabs(Pos.last() - Pos.first());
+        frequency = diffPos / diffT;
+        oldFrequency = frequency;
+        return frequency; // Revolutions per second
+    }
+    else
+        return oldFrequency;
+}
+uint8_t MyEncoder::getIndexState()
+{
+    return digitalRead(indexPin);
+}
+
+void MyEncoder::setScale(double scale)
+{
+    if (CurPosScale != scale && scale != 0)
+    {
+        CurPosScale = scale;
+        PosScaleRes = 1.0 / double(scale);
+    }
+}
+
+void MyEncoder::setLatch(uint8_t latchEnable)
+{
+    if (latchEnable && !oldLatchCEnable) // Should only happen first time IndexCEnable is set
+    {
+        pleaseZeroTheCounter = 1;
+    }
+    oldLatchCEnable = latchEnable;
+}