comparison core/PulseIn.cpp @ 193:3c3d14654b7f

Added PulseIn.

+/*
+* PulseIn.cpp
+*
+*  Created on: 4 Feb 2016
+*      Author: giulio
+*/
+
+#include "../include/PulseIn.h"
+
+void PulseIn::init(BeagleRTContext* context, unsigned int digitalInput, int direction){
+	_digitalInput = digitalInput;
+	_pulseIsOn = false;
+	_pulseOnState = direction == 1 ? 1 : 0;
+	_array.resize(context->digitalFrames);
+	_lastContext = (uint64_t)-1;
+	pinModeFrame(context, 0, digitalInput, INPUT); //context is used to allocate the number of elements in the array
+}
+
+void PulseIn::check(BeagleRTContext* context){
+	if(_digitalInput == -1){ //must be init'ed before calling check();
+		throw(1);
+	}
+	for(unsigned int n = 0; n < context->digitalFrames; n++){
+		_array[n] = 0; //maybe a few of these will be overwritten below
+	}
+	for(unsigned int n = 0; n < context->digitalFrames; n++){
+		if(_pulseIsOn == false){ // look for start edge
+			if(digitalReadFrame(context, n, _digitalInput) == _pulseOnState){
+				_pulseStart = context->audioSampleCount + n; // store location of start edge
+				_pulseIsOn = true;
+			}
+		} else { // _pulseIsOn == true;
+			if(digitalReadFrame(context, n, _digitalInput) == !_pulseOnState){ // look for stop edge
+				_array[n] = context->audioSampleCount + n - _pulseStart; // compute and store pulse duration
+				_pulseIsOn = false;
+			}
+		}
+	}
+	_lastContext = context->audioSampleCount;
+};
+
+PulseIn::~PulseIn() {
+// TODO Auto-generated destructor stub
+}
+