ardupilot/libraries/AP_ADSB/GDL90_protocol/hostGDL90Support.h

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/*
Copyright (C) 2021 Kraus Hamdani Aerospace Inc. All rights reserved.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Author: GDL90/UCP protocol by uAvionix, 2021.
Implemented by: Tom Pittenger
*/
#ifndef _GDL90_H_
#define _GDL90_H_
#include <stdint.h>
#define GDL90_QUEUE_LENGTH (2)
#define GDL90_FLAG_BYTE (0x7E)
#define GDL90_CONTROL_ESCAPE_BYTE (0x7D)
#define GDL90_STUFF_BYTE (0x20)
#define GDL90_OVERHEAD_LENGTH (3) // Not counting framing bytes
// Transmit message sizes
#define GDL90_TX_MAX_PAYLOAD_LENGTH (552)
#define GDL90_TX_MAX_PACKET_LENGTH (GDL90_TX_MAX_PAYLOAD_LENGTH + GDL90_OVERHEAD_LENGTH)
#define GDL90_TX_MAX_FRAME_LENGTH (2 + ((15 * GDL90_TX_MAX_PACKET_LENGTH) / 10)) // IF every other byte was stuffed
// Receive message sizes
#define GDL90_RX_MAX_PAYLOAD_LENGTH (128)
#define GDL90_RX_MAX_PACKET_LENGTH (GDL90_RX_MAX_PAYLOAD_LENGTH + GDL90_OVERHEAD_LENGTH)
typedef union __attribute__((__packed__))
{
struct __attribute__((__packed__))
{
GDL90_MESSAGE_ID messageId;
uint8_t payload[GDL90_TX_MAX_PAYLOAD_LENGTH];
uint16_t crc; // Actually CRC location varies. This is a placeholder
};
uint8_t raw[GDL90_TX_MAX_PACKET_LENGTH];
} GDL90_TX_MESSAGE;
typedef union __attribute__((__packed__))
{
struct __attribute__((__packed__))
{
GDL90_MESSAGE_ID messageId;
uint8_t payload[GDL90_RX_MAX_PAYLOAD_LENGTH];
uint16_t crc; // Actually CRC location varies. This is a placeholder
};
uint8_t raw[GDL90_RX_MAX_PACKET_LENGTH];
} GDL90_RX_MESSAGE;
typedef enum
{
GDL90_RX_IDLE,
GDL90_RX_IN_PACKET,
GDL90_RX_UNSTUFF,
//GDL90_RX_END,
} GDL90_RX_STATE;
typedef struct
{
GDL90_RX_STATE state;
uint16_t length;
//uint32_t overflow;
//uint32_t complete;
uint8_t prev_data;
} GDL90_RX_STATUS;
#endif