diff options
Diffstat (limited to 'src/fmfsk.h')
| -rw-r--r-- | src/fmfsk.h | 67 |
1 files changed, 34 insertions, 33 deletions
diff --git a/src/fmfsk.h b/src/fmfsk.h index 4fe3d20..a223f11 100644 --- a/src/fmfsk.h +++ b/src/fmfsk.h @@ -30,47 +30,49 @@ #define __C2FMFSK_H #include <stdint.h> + #include "comp.h" #include "modem_stats.h" #define FMFSK_SCALE 16383 -/* +/* * fm-me-2fsk state */ -struct FMFSK{ - /* Static fmfsk parameters */ - int Rb; /* Manchester-encoded bitrate */ - int Rs; /* Raw modem symbol rate */ - int Fs; /* Sample rate */ - int Ts; /* Samples-per-symbol */ - int N; /* Sample processing buffer size */ - int nsym; /* Number of raw modem symbols processed per demod call */ - int nbit; /* Number of bits spit out per demod call */ - int nmem; /* Number of samples kept around between demod calls */ - - /* State kept by demod */ - int nin; /* Number of samples to be demod-ed the next cycle */ - int lodd; /* Last integrated sample for odd bitstream generation */ - float * oldsamps; /* Memory of old samples to make clock-offset-tolerance possible */ - - /* Stats generated by demod */ - float norm_rx_timing; /* RX Timing, used to calculate clock offset */ - int ppm; /* Clock offset in parts-per-million */ - float snr_mean; - - /* Modem stat structure */ - struct MODEM_STATS * stats; +struct FMFSK { + /* Static fmfsk parameters */ + int Rb; /* Manchester-encoded bitrate */ + int Rs; /* Raw modem symbol rate */ + int Fs; /* Sample rate */ + int Ts; /* Samples-per-symbol */ + int N; /* Sample processing buffer size */ + int nsym; /* Number of raw modem symbols processed per demod call */ + int nbit; /* Number of bits spit out per demod call */ + int nmem; /* Number of samples kept around between demod calls */ + + /* State kept by demod */ + int nin; /* Number of samples to be demod-ed the next cycle */ + int lodd; /* Last integrated sample for odd bitstream generation */ + float *oldsamps; /* Memory of old samples to make clock-offset-tolerance + possible */ + + /* Stats generated by demod */ + float norm_rx_timing; /* RX Timing, used to calculate clock offset */ + int ppm; /* Clock offset in parts-per-million */ + float snr_mean; + + /* Modem stat structure */ + struct MODEM_STATS *stats; }; /* * Create a new fmfsk modem instance. - * + * * int Fs - sample rate * int Rb - non-manchester bitrate * returns - new struct FMFSK on success, NULL on failure */ -struct FMFSK * fmfsk_create(int Fs,int Rb); +struct FMFSK *fmfsk_create(int Fs, int Rb); /* * Destroys an fmfsk modem and deallocates memory @@ -80,7 +82,7 @@ void fmfsk_destroy(struct FMFSK *fmfsk); /* * Deposit demod statistics into a MODEM_STATS struct */ -void fmfsk_get_demod_stats(struct FMFSK *fmfsk,struct MODEM_STATS *stats); +void fmfsk_get_demod_stats(struct FMFSK *fmfsk, struct MODEM_STATS *stats); /* * Returns the number of samples that must be fed to fmfsk_demod the next @@ -90,22 +92,21 @@ uint32_t fmfsk_nin(struct FMFSK *fmfsk); /* * Modulates nbit bits into N samples to be sent through an FM radio - * + * * struct FSK *fsk - FSK config/state struct, set up by fsk_create * float mod_out[] - Buffer for N samples of modulated FMFSK * uint8_t tx_bits[] - Buffer containing Nbits unpacked bits */ -void fmfsk_mod(struct FMFSK *fmfsk, float fmfsk_out[],uint8_t bits_in[]); - +void fmfsk_mod(struct FMFSK *fmfsk, float fmfsk_out[], uint8_t bits_in[]); /* - * Demodulate some number of FMFSK samples. The number of samples to be + * Demodulate some number of FMFSK samples. The number of samples to be * demodulated can be found by calling fmfsk_nin(). - * + * * struct FMFSK *fsk - FMFSK config/state struct, set up by fsk_create * uint8_t rx_bits[] - Buffer for nbit unpacked bits to be written * float fsk_in[] - nin samples of modualted FMFSK from an FM radio */ -void fmfsk_demod(struct FMFSK *fmfsk, uint8_t rx_bits[],float fmfsk_in[]); +void fmfsk_demod(struct FMFSK *fmfsk, uint8_t rx_bits[], float fmfsk_in[]); #endif |