/*
 * downstream_spi.h
 *
 *  Created on: 24/07/2015
 *      Author: Robert Fisk
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

#ifndef INC_DOWNSTREAM_SPI_H_
#define INC_DOWNSTREAM_SPI_H_


#include "usbh_config.h"


#define DOWNSTREAM_PACKET_HEADER_LEN		(2)			//Min length = CommandClass & Command bytes
#define DOWNSTREAM_PACKET_LEN				(DOWNSTREAM_PACKET_HEADER_LEN + USBH_MAX_DATA_BUFFER)
#define DOWNSTREAM_PACKET_LEN_MIN			(DOWNSTREAM_PACKET_HEADER_LEN)

#define DOWNSTREAM_PACKET_HEADER_LEN_16		(DOWNSTREAM_PACKET_HEADER_LEN / 2)
#define DOWNSTREAM_PACKET_LEN_16			(DOWNSTREAM_PACKET_LEN / 2)
#define DOWNSTREAM_PACKET_LEN_MIN_16		(DOWNSTREAM_PACKET_LEN_MIN / 2)

#define DOWNSTREAM_SPI_FREAKOUT									\
	do {														\
		LED_Fault_SetBlinkRate(LED_FAST_BLINK_RATE);			\
		/*Downstream_PacketProcessor_SetErrorState();*/				\
		/*DownstreamInterfaceState = DOWNSTREAM_INTERFACE_ERROR;*/	\
		while (1);												\
	} while (0);



typedef enum
{
	DOWNSTREAM_INTERFACE_IDLE,
	DOWNSTREAM_INTERFACE_RX_SIZE_WAIT,
	DOWNSTREAM_INTERFACE_RX_PACKET_WAIT,
	DOWNSTREAM_INTERFACE_TX_SIZE_WAIT,
	DOWNSTREAM_INTERFACE_TX_PACKET_WAIT,
	DOWNSTREAM_INTERFACE_ERROR
}
InterfaceStateTypeDef;


typedef enum
{
	NOT_BUSY,
	BUSY
}
PacketBusyTypeDef;


typedef struct
{
	PacketBusyTypeDef	Busy;						//Everything after Busy should be word-aligned
	uint16_t			Length16 __ALIGN_END;		//Packet length includes CommandClass, Command, and Data
	uint8_t				CommandClass;
	uint8_t				Command;
	uint8_t				Data[USBH_MAX_DATA_BUFFER];	//Should (must?) be word-aligned, for USB copy routine
}
DownstreamPacketTypeDef;



typedef void (*FreePacketCallbackTypeDef)(DownstreamPacketTypeDef* freePacket);
typedef void (*SpiPacketReceivedCallbackTypeDef)(DownstreamPacketTypeDef* receivedPacket);


void Downstream_InitSPI(void);
HAL_StatusTypeDef Downstream_GetFreePacket(FreePacketCallbackTypeDef callback);
DownstreamPacketTypeDef* Downstream_GetFreePacketImmediately(void);
void Downstream_ReleasePacket(DownstreamPacketTypeDef* packetToRelease);
HAL_StatusTypeDef Downstream_ReceivePacket(SpiPacketReceivedCallbackTypeDef callback);
HAL_StatusTypeDef Downstream_TransmitPacket(DownstreamPacketTypeDef* packetToWrite);
void Downstream_SPIProcess(void);

void HAL_SPI_TxRxCpltCallback(SPI_HandleTypeDef *hspi);
void HAL_SPI_ErrorCallback(SPI_HandleTypeDef *hspi);


#endif /* INC_DOWNSTREAM_SPI_H_ */