79 lines
1.5 KiB
C
79 lines
1.5 KiB
C
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#ifndef FSK_MODEM_H
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#define FSK_MODEM_H
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#include "config.h"
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#include "hardware.h"
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#include <cfg/compiler.h>
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#include <io/kfile.h>
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#include <struct/fifobuf.h>
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#define SAMPLERATE 9600
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#define BITRATE 1200
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#define SAMPLEPERBIT (SAMPLERATE / BITRATE)
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typedef struct Hdlc
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{
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uint8_t demod_bits; ///< Bitstream from the demodulator.
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uint8_t bit_idx; ///< Current received bit.
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uint8_t currchar; ///< Current received character.
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bool rxstart; ///< True if an HDLC_FLAG char has been found in the bitstream.
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} Hdlc;
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#define AFSK_RXFIFO_OVERRUN BV(0)
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typedef struct Afsk
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{
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KFile fd;
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int adc_ch;
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int dac_ch;
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uint8_t sample_count;
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uint8_t curr_out;
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uint8_t tx_bit;
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bool bit_stuff;
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uint8_t stuff_cnt;
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uint16_t phase_acc;
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uint16_t phase_inc;
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FIFOBuffer delay_fifo;
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int8_t delay_buf[SAMPLEPERBIT / 2 + 1];
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FIFOBuffer rx_fifo;
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uint8_t rx_buf[CONFIG_AFSK_RX_BUFLEN];
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FIFOBuffer tx_fifo;
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uint8_t tx_buf[CONFIG_AFSK_TX_BUFLEN];
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int16_t iir_x[2];
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int16_t iir_y[2];
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uint8_t sampled_bits;
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int8_t curr_phase;
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uint8_t found_bits;
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volatile bool sending;
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volatile int status;
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Hdlc hdlc;
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uint16_t preamble_len;
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uint16_t trailer_len;
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} Afsk;
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#define KFT_AFSK MAKE_ID('A', 'F', 'S', 'K')
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INLINE Afsk *AFSK_CAST(KFile *fd)
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{
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ASSERT(fd->_type == KFT_AFSK);
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return (Afsk *)fd;
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}
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void afsk_adc_isr(Afsk *af, int8_t sample);
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uint8_t afsk_dac_isr(Afsk *af);
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void afsk_init(Afsk *af, int adc_ch, int dac_ch);
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#define AFSK_BUTTERWORTH 0
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#define AFSK_CHEBYSHEV 1
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int afsk_testSetup(void);
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int afsk_testRun(void);
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int afsk_testTearDown(void);
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#endif
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