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/*
* Duet3DFilamentSensor.h
*
* Created on: 20 Jul 2017
* Author: David
*
* This is the base class for filament monitors that use the Duet3D protocol for sending 16-bit words to the Duet.
*/
#ifndef SRC_FILAMENTSENSORS_DUET3DFILAMENTMONITOR_H_
#define SRC_FILAMENTSENSORS_DUET3DFILAMENTMONITOR_H_
#include "FilamentMonitor.h"
class Duet3DFilamentMonitor : public FilamentMonitor
{
public:
Duet3DFilamentMonitor(unsigned int drv, unsigned int monitorType, DriverId did) noexcept;
bool Interrupt() noexcept override;
protected:
void InitReceiveBuffer() noexcept;
enum class PollResult : uint8_t
{
incomplete,
complete,
error
};
PollResult PollReceiveBuffer(uint16_t& measurement) noexcept;
bool IsReceiving() const noexcept;
bool IsWaitingForStartBit() const noexcept;
protected:
uint32_t overrunErrorCount;
uint32_t polarityErrorCount;
private:
static constexpr size_t EdgeCaptureBufferSize = 64; // must be a power of 2
// Buffer used to capture received data, and associated info
uint32_t edgeCaptures[EdgeCaptureBufferSize];
size_t edgeCaptureReadPointer;
volatile size_t edgeCaptureWritePointer;
enum class RxdState : uint8_t
{
waitingForStartBit = 0,
waitingForEndOfStartBit,
waitingForNibble,
errorRecovery1,
errorRecovery2,
errorRecovery3,
errorRecovery4
};
uint32_t startBitLength;
uint32_t errorRecoveryStartTime;
size_t lastBitChangeIndex;
uint16_t valueBeingAssembled;
uint8_t nibblesAssembled;
RxdState state;
};
#endif /* SRC_FILAMENTSENSORS_DUET3DFILAMENTMONITOR_H_ */
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