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