/*
 * usart_handler.h
 *
 *  Created on: Sep 16, 2019
 *      Author: abody
 */

#ifndef USART_HANDLER_H_
#define USART_HANDLER_H_
#include <f4ll_c/crcscheduler.h>
#include <inttypes.h>

#include "f4ll_c/dmahelper.h"

struct usart_buffer_t;
struct usartstatus_t;

typedef void (*pku_packetreceivedcallback_t)(void *userParam, struct usart_buffer_t *buffer);

void Pku_Init(
	struct usartstatus_t *st, USART_TypeDef *usart, DMA_TypeDef *dma,
	uint32_t stream_rx, uint32_t stream_tx,
	struct crcstatus_t *crcStatus,
	pku_packetreceivedcallback_t packetReceivedCallback, void * packetReceivedCallbackParam);

uint8_t* Pku_GetTxBuffer(struct usartstatus_t *status);

uint8_t Pku_Post(struct usartstatus_t *status, uint8_t const *payload, uint16_t length, struct crcstatus_t *crcStatus, uint8_t waitForCrcQueue);
void Pku_SetupReceive(struct usartstatus_t *status);
void Pku_SetupTransmit(USART_TypeDef *usart, DMA_TypeDef* dma, uint32_t stream, void *buffer, uint32_t length);
void Pku_ConsumePacket(struct usartstatus_t *status, uint8_t packetIndex);

void Pku_HandleRxDmaIrq(struct usartstatus_t *status);
void Pku_HandleTxDmaIrq(struct usartstatus_t *status);
void Pku_HandleUsartIrq(struct usartstatus_t *status);

/******************************************************************************************
 * 
 * 
 * 
 */
 
struct usart_stats {
	uint32_t overrun;
	uint32_t hdrError;
	uint32_t lastErrHdr;
	uint32_t payloadErrror;
	uint32_t pep1, pep2;
	uint32_t dmaError;
	uint32_t rcvd;
	uint32_t premature_hdr;
	uint32_t premature_payload;
	uint32_t sent;
	uint32_t skiped;
};

struct usartpacketheader_t {
	uint8_t startByte;
	uint8_t serial;
	uint8_t payloadLength;
	uint8_t hash;
};

struct usartpacket_t {
	struct usartpacketheader_t header;
	//!!! should start on word offset !!!
	uint8_t	payload[256+sizeof(uint32_t)];	// extra room for crc32
} __attribute__((aligned));

struct usart_buffer_t {
	struct usartpacket_t packet;
	//transfer area ends here
	volatile uint8_t busy;
	volatile uint8_t error;
	uint16_t requestedLength;
	uint32_t errorInfo;
	struct usartstatus_t *usartStatus;
};

struct usartstatus_t {
	USART_TypeDef *usart;
	struct dmainfo_t rxDmaInfo;
	struct dmainfo_t txDmaInfo;
	struct crcstatus_t *crcStatus;
	struct crcslotlistitem_t crcSlot;
	struct crcslottask_t crcTasks[2];

	uint8_t rxSerial;
	uint8_t txSerial;
	struct usart_stats stats;
	uint8_t activeRxBuf;
	pku_packetreceivedcallback_t packetReceivedCallback;
	void *packetReceivedCallbacParam;
	struct usart_buffer_t txBuffer;
	struct usart_buffer_t rxBuffers[2];
};

#ifndef USART_STATS_DISABLED
static inline void StatsIncOverrun(struct usart_stats *s) {
	++s->overrun;
}
static inline void StatsIncHdrError(struct usart_stats *s, uint32_t hdr) {
	++s->hdrError;
	s->lastErrHdr = hdr;
}
static inline void StatsIncPayloadError(struct usart_stats *s, uint32_t pep1, uint32_t pep2) {
	++s->payloadErrror;
	s->pep1 = pep1;
	s->pep2 = pep2;
}
static inline void StatsIncDmaError(struct usart_stats *s) {
	++s->dmaError;
}
static inline void StatsIncRcvd(struct usart_stats *s) {
	++s->rcvd;
}
static inline void StatsIncPremature_hdr(struct usart_stats *s) {
	++s->premature_hdr;
}
static inline void StatsIncPremature_payload(struct usart_stats *s) {
	++s->premature_payload;
}
static inline void StatsIncSent(struct usart_stats *s) {
	++s->sent;
}
static inline void StatsAddSkiped(struct usart_stats *s, uint8_t cnt) {
	s->skiped += s->rcvd > 2 ? cnt : 0;
}

#else	//	USART_STATS_DISABLED
#define StatsIncOverrun(x)
#define StatsIncHdrError(x,y)
#define StatsIncPayloadError(x,y,z)
#define StatsIncDmaError(x)
#define StatsIncRcvd(x)
#define StatsIncPremature_hdr(x)
#define StatsIncPremature_payload(x)
#define StatsIncSent(x)
#define StatsAddSkiped(x)
#endif	//	USART_STATS_DISABLED

#endif /* UART_HANDLER_H_ */