/*
 * ll_HsUsart.h
 *
 *  Created on: Oct 29, 2019
 *      Author: abody
 */

#ifndef LL_HSUSART_H_
#define LL_HSUSART_H_
#include <platform/usart_ll.h>
#include "f4ll/usartcore.h"
#include "f4ll/crchandler.h"

namespace f4ll {

struct DMAINFO;

class PacketUsart : public CrcHandler::ICallback, public UsartCore
{
//	friend class UsartCore;
public:
	PacketUsart(USART_TypeDef *usart, DMA_TypeDef *dma, uint32_t stream_rx, uint32_t stream_tx);

	struct PacketHeader {	// !!! size should be multiple of 4 !!!
		uint8_t startByte;
		uint8_t serial;
		uint8_t payloadLength;
		uint8_t hash;
	};

	struct Packet {
		PacketHeader header;
		uint8_t      payload[256+sizeof(uint32_t)];	// extra room for crc32
	} __attribute__((aligned));

	struct Stats {
		uint32_t overrun           = 0;
		uint32_t hdrError          = 0;
		uint32_t payloadErrror     = 0;
		uint32_t pep1              = 0;
		uint32_t pep2              = 0;
		uint32_t rxDmaError        = 0;
		uint32_t txDmaError        = 0;
		uint32_t rcvd              = 0;
		uint32_t premature_hdr     = 0;
		uint32_t premature_payload = 0;
		uint32_t sent              = 0;
		uint32_t skiped            = 0;
	};

	struct IHsUsartCallback {
		virtual bool PacketReceived(PacketUsart *caller, uintptr_t userParam, Packet const &packet) = 0;
	};

	// CRCHandler::ICallback interface functions
	virtual void CrcSucceeded(uintptr_t callbackParam, uint32_t crc, uint8_t task);
	virtual void CrcFailed(uintptr_t callbackParam, uint32_t crc, uint8_t task);

	void PostPacket(uint8_t const *payload, uint8_t length, bool waitForCrcQueue = true);
	void SetupReceive(void);

	void RxProcessed(bool second);

	// Getters
	uint8_t* GetTxPacketBuffer(void)               { return m_txBuffer.packet.payload; }
	uint8_t const * GetRxPacketBuffer(bool second) { return m_rxBuffers[second].packet.payload; }
	USART_TypeDef* GetUsart(void) const            { return m_usart; }
	Stats const & GetStats(void) const             { return m_stats; }
	inline bool IsTxBusy(void) const               { return m_txBuffer.busy; }
	inline bool IsTxFailed(void) const             { return m_txBuffer.error; }
	inline bool IsRxBusy(bool second) const        { return m_rxBuffers[second].busy; }
	inline bool IsRxFailed(bool second) const      { return m_rxBuffers[second].error; }

	void SetCallback(IHsUsartCallback* callback, uintptr_t callbackParam);

private:
	void BuildHeader(Packet &packet, uint8_t serialNo, uint8_t length);
	bool CheckHeader(PacketHeader &header);
	void SwitchRxBuffers(void);

	// UsartCore pure virtual function implementations
	virtual void ReceiverIdle(void);
	virtual void TransmissionComplete(void);
	virtual void FramingError(void);
	virtual void Overrun(void);
	virtual void RxDmaTransferComplete(void);
	virtual void RxDmaHalfTransfer(void);
	virtual void RxDmaError(DmaHelper::DmaErrorType reason);
	virtual void TxDmaTransferComplete(void);
	virtual void TxDmaHalfTransfer(void);
	virtual void TxDmaError(DmaHelper::DmaErrorType reason);

	struct Buffer {
		Packet packet;
		//transfer area ends here
		bool volatile busy       = 0;
		bool volatile error      = 0;
		uint16_t requestedLength = 0;
		uint32_t errorInfo       = 0;
	};

	static const uint8_t STARTMARKER = 0x95;

	uint8_t        m_rxSerialNo = -1;
	uint8_t        m_txSerialNo = -1;
	Stats          m_stats;
	bool           m_rxBufferSelector = false;

	CrcHandler::Slot<2>     m_crcSlot;
	IHsUsartCallback       *m_userCallback = nullptr;
	uintptr_t               m_userCallbackParam = 0;
	Buffer                  m_txBuffer;
	Buffer                  m_rxBuffers[2];
};

}
#endif /* LL_HSUSART_H_ */