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102 lines
2.6 KiB
102 lines
2.6 KiB
/*
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This file is part of VP-Digi.
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VP-Digi 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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VP-Digi 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 VP-Digi. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef AX25_H_
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#define AX25_H_
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#define FRAMELEN (150) //single frame max length
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#define FRAMEBUFLEN (600) //circural frame buffer (multiple frames) length
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#include <stdint.h>
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typedef enum
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{
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RX_STAGE_IDLE,
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RX_STAGE_FLAG,
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RX_STAGE_FRAME,
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} RxStage;
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typedef struct
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{
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uint16_t txDelayLength; //TXDelay length in ms
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uint16_t txTailLength; //TXTail length in ms
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uint16_t quietTime; //Quiet time in ms
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uint8_t allowNonAprs; //allow non-APRS packets
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} Ax25_config;
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Ax25_config ax25Cfg;
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typedef struct
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{
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uint8_t frameBuf[FRAMEBUFLEN]; //cirucal buffer for received frames, frames are separated with 0xFF
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uint16_t frameBufWr; //cirucal RX buffer write index
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uint16_t frameBufRd; //circural TX buffer read index
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uint8_t frameXmit[FRAMEBUFLEN]; //TX frame buffer
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uint16_t xmitIdx; //TX frame buffer index
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uint16_t sLvl; //RMS of the frame
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uint8_t frameReceived; //frame received flag, must be polled in main loop for >0. Bit 0 for frame received on decoder 1, bit 1 for decoder 2
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} Ax25;
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Ax25 ax25;
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/**
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* @brief Get current RX stage
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* @param[in] modemNo Modem/decoder number (0 or 1)
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* @return RX_STATE_IDLE, RX_STATE_FLAG or RX_STATE_FRAME
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* @warning Only for internal use
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*/
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RxStage Ax25_getRxStage(uint8_t modemNo);
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/**
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* @brief Parse incoming bit (not symbol!)
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* @details Handles bit-stuffing, header and CRC checking, stores received frame and sets "frame received flag", multiplexes both decoders
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* @param[in] bit Incoming bit
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* @param[in] *dem Modem state pointer
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* @warning Only for internal use
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*/
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void Ax25_bitParse(uint8_t bit, uint8_t modemNo);
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/**
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* @brief Get next bit to be transmitted
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* @return Bit to be transmitted
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* @warning Only for internal use
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*/
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uint8_t Ax25_getTxBit(void);
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/**
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* @brief Initialize transmission and start when possible
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*/
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void Ax25_transmitBuffer(void);
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/**
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* @brief Start transmitting when possible
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* @attention Must be continuously polled in main loop
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*/
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void Ax25_transmitCheck(void);
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/**
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* @brief Initialize AX25 module
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*/
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void Ax25_init(void);
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#endif /* AX25_H_ */
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