afsk.h

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#ifndef DRV_AFSK_H
#define DRV_AFSK_H

#include "cfg/cfg_afsk.h"
#include "hw/hw_afsk.h"

#include <kern/kfile.h>
#include <cfg/compiler.h>
#include <struct/fifobuf.h>



#define SAMPLERATE 9600

#define BITRATE    1200

#define SAMPLEPERBIT (SAMPLERATE / BITRATE)

typedef struct Hdlc
{
    uint8_t demod_bits; 
    uint8_t bit_idx;    
    uint8_t currchar;   
    bool rxstart;       
} Hdlc;

#define AFSK_RXFIFO_OVERRUN BV(0)

typedef struct Afsk
{
    KFile fd;

    int adc_ch;

    int dac_ch;

    uint8_t sample_count;

    uint8_t curr_out;

    uint8_t tx_bit;

    bool bit_stuff;

    uint8_t stuff_cnt;
    uint16_t phase_acc;

    uint16_t phase_inc;

    FIFOBuffer delay_fifo;

    int8_t delay_buf[SAMPLEPERBIT / 2 + 1];

    FIFOBuffer rx_fifo;

    uint8_t rx_buf[CONFIG_AFSK_RX_BUFLEN];

    FIFOBuffer tx_fifo;

    uint8_t tx_buf[CONFIG_AFSK_TX_BUFLEN];

    int16_t iir_x[2];

    int16_t iir_y[2];

    uint8_t sampled_bits;

    int8_t curr_phase;

    uint8_t found_bits;

    volatile bool sending;

    volatile int status;

    Hdlc hdlc;

    uint16_t preamble_len;

    uint16_t trailer_len;
} Afsk;

#define KFT_AFSK MAKE_ID('A', 'F', 'S', 'K')

INLINE Afsk *AFSK_CAST(KFile *fd)
{
  ASSERT(fd->_type == KFT_AFSK);
  return (Afsk *)fd;
}


void afsk_adc_isr(Afsk *af, int8_t sample);
uint8_t afsk_dac_isr(Afsk *af);
void afsk_init(Afsk *af, int adc_ch, int dac_ch);


#define AFSK_BUTTERWORTH  0
#define AFSK_CHEBYSHEV    1
/* \} */

int afsk_testSetup(void);
int afsk_testRun(void);
int afsk_testTearDown(void);

#endif