diff options
Diffstat (limited to 'src/common/fsk.h')
| -rw-r--r-- | src/common/fsk.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/common/fsk.h b/src/common/fsk.h new file mode 100644 index 0000000..1a1009a --- /dev/null +++ b/src/common/fsk.h @@ -0,0 +1,31 @@ +#include "../common/fm_modulation.h" + +typedef struct ffsk { + void *inst; + int (*send_bit)(void *inst); + void (*receive_bit)(void *inst, int bit, double quality, double level); + fm_demod_t demod; + iir_filter_t tx_filter; + double bits_per_sample; /* fraction of a bit per sample */ + double *sin_tab; /* sine table with correct peak level */ + double phaseshift65536[2]; /* how much the phase of fsk synbol changes per sample */ + double cycles_per_bit65536[2]; /* cacles of one bit */ + double tx_phase65536; /* current transmit phase */ + double level; /* level (amplitude) of signal */ + int coherent; /* set, if coherent TX mode */ + double f0_deviation; /* deviation of frequencies, relative to center */ + double f1_deviation; + int low_bit, high_bit; /* a low or high deviation means which bit? */ + int tx_bit; /* current transmitting bit (-1 if not set) */ + int rx_bit; /* current receiving bit (-1 if not yet measured) */ + double tx_bitpos; /* current transmit position in bit */ + double rx_bitpos; /* current receive position in bit (sampleclock) */ + double rx_bitadjust; /* how much does a bit change cause the sample clock to be adjusted in phase */ +} fsk_t; + +int fsk_init(fsk_t *fsk, void *inst, int (*send_bit)(void *inst), void (*receive_bit)(void *inst, int bit, double quality, double level), int samplerate, double bitrate, double f0, double f1, double level, int coherent, double bitadjust); +void fsk_cleanup(fsk_t *fsk); +void fsk_receive(fsk_t *fsk, sample_t *sample, int length); +int fsk_send(fsk_t *fsk, sample_t *sample, int length, int add); +void fsk_tx_reset(fsk_t *fsk); + |