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