/*
 * 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 + BOT_PAGE_LENGTH)
#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 {                                                        \
        Downstream_PacketProcessor_FreakOut();                  \
        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[BOT_PAGE_LENGTH];      //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_ */