63 lines
2.3 KiB
C
63 lines
2.3 KiB
C
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struct dms_frame {
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struct dms_frame *next;
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uint8_t s; /* CT/DT frame */
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uint8_t n; /* sequence number */
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uint8_t data[8]; /* data */
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};
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struct dms_state {
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int started; /* did we start conversation ? */
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int rand_sent; /* if we sent rand as an initiator? */
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int established; /* DT frames after RAND (ack) */
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int tx_pending; /* uper layer sent data, but not yet sent and acked */
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uint8_t n_r; /* next expected frame to be received */
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uint8_t n_s; /* next frame to be sent */
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uint8_t n_a; /* next frame to be acked */
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uint8_t n_count; /* counts frames that are stored in list */
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uint8_t dir; /* direction */
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int eight_bits; /* what mode are used for DT frames */
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struct dms_frame *frame_list; /* list of frames to transmit */
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int send_rr; /* RR must be sent next */
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};
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typedef struct dms {
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/* DMS transmission */
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int tx_frame_valid; /* do we have or had a valid frame? */
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char tx_frame[127]; /* carries bits of one frame to transmit */
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int tx_frame_length;
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int tx_frame_pos;
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uint16_t rx_sync; /* shift register to detect sync */
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double rx_sync_level[256]; /* level infos */
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double rx_sync_quality[256]; /* quality infos */
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int rx_sync_count; /* next bit to receive */
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int rx_in_sync; /* if we are in sync and receive bits */
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uint8_t rx_frame[12]; /* receive frame, including label at the start and 3 words crc */
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double rx_frame_level[12]; /* level info */
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double rx_frame_quality[12]; /* quality info */
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int rx_bit_count; /* next bit to receive */
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int rx_frame_count; /* next character to receive */
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struct {
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uint8_t d; /* direction */
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uint8_t s; /* selection */
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uint8_t p; /* prefix */
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uint8_t n; /* number of DT frame */
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} rx_label; /* used while receiving frame */
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/* DMS protocol states */
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struct dms_state state;
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} dms_t;
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int dms_init_sender(nmt_t *nmt);
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void dms_cleanup_sender(nmt_t *nmt);
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int dms_send_bit(nmt_t *nmt);
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void fsk_receive_bit_dms(nmt_t *nmt, int bit, double quality, double level);
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void dms_reset(nmt_t *nmt);
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void dms_send(nmt_t *nmt, const uint8_t *data, int length, int eight_bits);
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void dms_all_sent(nmt_t *nmt);
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void dms_receive(nmt_t *nmt, const uint8_t *data, int length, int eight_bits);
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void trigger_frame_transmission(nmt_t *nmt);
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