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

#ifndef UART_HANDLER_H_
#define UART_HANDLER_H_
#include <inttypes.h>
#include <dma.h>
#include <stats.h>

#include "dma_helper.h"
#include "crc_handler.h"

/*
 *	TH	UART	RXDMA	TXDMA
 *	0	1		D2S5	D2S7
 *	1	3		D1S1	D1S3
 *	2	2		D1S5	D1S6
 *	3	6		D2S2	D2S6
 */

typedef struct {
	uint8_t	startByte;
	uint8_t serial;
	uint8_t payloadLength;
	uint8_t hash;
} UARTPACKETHEADER;

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

typedef struct _UARTBUFFER {
	UARTPACKET			packet;
	//transfer area ends here
	volatile uint8_t	busy;
	volatile uint8_t	error;
	uint16_t			requestedLength;
	uint32_t			errorInfo;
} UARTBUFFER;

typedef struct {
	USART_TypeDef		*uart;
	DMAINFO				rxDmaInfo;
	DMAINFO				txDmaInfo;
	struct crcstatus_t	*crcStatus;
	uint8_t				rxSerial;
	uint8_t				txSerial;
	STATS				stats;
	uint8_t				activeRxBuf;
	uint8_t				rxCrcSlot;
	uint8_t				txCrcSlot;
	UARTBUFFER			txBuffer;
	UARTBUFFER			rxBuffers[2];
} UARTSTATUS;

#define STARTMARKER 0xa5

void InitUartStatus(
		UARTSTATUS *st, USART_TypeDef *uart, DMA_TypeDef *dma,
		uint32_t stream_rx, uint32_t stream_tx,
		struct crcstatus_t *crcStatus, uint8_t rxCrcSlot, uint8_t txCrcSlot);
static inline uint8_t* GetTxBuffer(UARTSTATUS *status) {
	return status->txBuffer.packet.payload;
}
uint8_t PostPacket(UARTSTATUS *status, uint8_t const *payload, uint16_t length, struct crcstatus_t *crcStatus);
void SetupReceive(UARTSTATUS *status);
void SetupTransmit(USART_TypeDef *uart, DMA_TypeDef* dma, uint32_t stream, void *buffer, uint32_t length);
void ConsumePacket(UARTSTATUS *status, uint8_t packetIndex, struct crcstatus_t *crcStatus);

void HandleUsartRxDmaIrq(UARTSTATUS *status);
void HandleUsartTxDmaIrq(UARTSTATUS *status);
void HandleUsartIrq(UARTSTATUS *status);

#endif /* UART_HANDLER_H_ */