kopia lustrzana https://github.com/bristol-seds/pico-tracker
97 wiersze
2.4 KiB
C
97 wiersze
2.4 KiB
C
/*
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* Outputs ax25 to the si_trx
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* Copyright (C) 2015 Richard Meadows <richardeoin>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef AX25_H
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#define AX25_H
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/**
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* Bell-202
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*/
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#define AX25_BAUD 1200
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#define AX25_MARK_FREQ 1200
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#define AX25_SPACE_FREQ 2200
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/**
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* GCLK division factors
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*/
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#define AX25_DIVISION_MARK 11
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#define AX25_DIVISION_SPACE 6
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/**
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* The fm deviation setting for the si radio
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*
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* With the current si filter settings this is equal to the deviation
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* of the high tone.
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*/
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#define AX25_DEVIATION 2500
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/**
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* How often our handler gets called
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*/
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#define AX25_TICK_RATE AX25_BAUD
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/**
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* AX25 packet parameters
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*/
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#define AX25_BITSTUFFINGCOUNT 5
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#define AX25_PREAMBLE_FLAGS 15 /* 100 ms of flags */
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#define AX25_POSTAMBLE_FLAGS 1
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#define AX25_MAX_FRAME_LEN 0x100
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/**
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* Hard-coded AX25 words
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*/
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#define AX25_CONTROL_WORD 0x03 /* Use Unnumbered Information (UI) frames */
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#define AX25_PROTOCOL_ID 0xF0 /* No third level protocol */
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#define AX25_HDLC_FLAG 0x7E
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enum ax25_symbol_t {
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AX25_MARK,
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AX25_SPACE,
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AX25_NONE,
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};
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struct ax25_byte_t {
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uint8_t val;
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uint8_t stuff;
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};
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/**
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* State machine
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*/
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enum ax25_state_t {
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AX25_PREAMBLE,
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AX25_FRAME,
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AX25_POSTAMBLE,
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AX25_IDLE,
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};
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void ax25_gpio1_pwm_init(void);
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void ax25_start(char* addresses, uint32_t addresses_len,
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char* information, uint32_t information_len);
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uint8_t ax25_tick(void);
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#endif /* AX25_H */
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