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72 lines
2.0 KiB
72 lines
2.0 KiB
#ifndef PROTOCOL_LLP_H
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#define PROTOCOL_LLP_H
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#include <stdio.h>
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#include <stdbool.h>
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#include "device.h"
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#define LLP_ADDR_BROADCAST 0xFFFF
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#define LLP_INTERLEAVE_SIZE 12
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#define LLP_MIN_FRAME_LENGTH LLP_INTERLEAVE_SIZE
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#define LLP_MAX_FRAME_LENGTH 48 * LLP_INTERLEAVE_SIZE
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#define LLP_HEADER_SIZE 10
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#define LLP_CHECKSUM_SIZE 2
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#define LLP_MAX_DATA_SIZE LLP_MAX_FRAME_LENGTH - LLP_HEADER_SIZE - LLP_CHECKSUM_SIZE
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#define LLP_DATA_BLOCK_SIZE ((LLP_INTERLEAVE_SIZE/3)*2)
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#define LLP_CRC_SIZE 2
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#define LLP_CRC_CORRECT 0xF0B8
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struct LLPCtx; // Forward declarations
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typedef void (*llp_callback_t)(struct LLPCtx *ctx);
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typedef struct LLPAddress {
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uint16_t network;
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uint16_t host;
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} LLPAddress;
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typedef struct LLPHeader {
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LLPAddress src;
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LLPAddress dst;
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uint8_t flags;
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uint8_t padding;
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} LLPHeader;
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typedef struct LLPMsg {
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LLPHeader header;
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const uint8_t *data;
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size_t len;
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} LLPMsg;
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typedef struct LLPCtx {
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uint8_t buf[LLP_MAX_FRAME_LENGTH];
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FILE *ch;
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LLPAddress *address;
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size_t frame_len;
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size_t readLength;
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uint16_t crc_in;
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uint16_t crc_out;
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uint8_t calculatedParity;
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long correctionsMade;
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llp_callback_t hook;
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bool sync;
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bool escape;
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bool ready_for_data;
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uint8_t interleaveCounter; // Keeps track of when we have received an entire interleaved block
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uint8_t interleaveOut[LLP_INTERLEAVE_SIZE]; // A buffer for interleaving bytes before they are sent
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uint8_t interleaveIn[LLP_INTERLEAVE_SIZE]; // A buffer for storing interleaved bytes before they are deinterleaved
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} LLPCtx;
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void llp_broadcast(LLPCtx *ctx, const void *_buf, size_t len);
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void llp_send(LLPCtx *ctx, LLPAddress *dst, const void *_buf, size_t len);
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void llp_sendRaw(LLPCtx *ctx, const void *_buf, size_t len);
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void llp_poll(LLPCtx *ctx);
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void llp_init(LLPCtx *ctx, LLPAddress *address, FILE *channel, llp_callback_t hook);
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void llpInterleave(LLPCtx *ctx, uint8_t byte);
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void llpDeinterleave(LLPCtx *ctx);
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uint8_t llpParityBlock(uint8_t first, uint8_t other);
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#endif |