75 lines
2.8 KiB
C
75 lines
2.8 KiB
C
#ifndef __RX_H
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#define __RX_H
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#include <stdint.h>
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#include <arm_math.h>
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#define NCO2_INCREMENT (343597383L)
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#define NCO2_FREQUENCY (DAC_SAMPLE_RATE/((0xFFFFFFFF)/NCO2_INCREMENT))
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// 1° stadio
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// decimazione del singolo stadio
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#define MS_HBF_TAP_NUM (15)
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#define MS_DECIMATION_FACTOR (2)
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#define MS_DECIMATION_FACTOR_MASK (MS_DECIMATION_FACTOR - 1)
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// ringbuf
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#define MIXED_SAMPLES_RINGBUFFER_SIZE (64) // l'ultimo deve essere grande almeno come MS_HBF_TAP_NUM
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#define MIXED_SAMPLES_RINGBUFFER_SIZE_MASK (MIXED_SAMPLES_RINGBUFFER_SIZE - 1)
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#define MIXED_SAMPLES_2M_RINGBUFFER_SIZE (MIXED_SAMPLES_RINGBUFFER_SIZE / 2)
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#define MIXED_SAMPLES_2M_RINGBUFFER_SIZE_MASK (MIXED_SAMPLES_2M_RINGBUFFER_SIZE - 1)
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#define ST1_OUT_SAMPLE_RATE (ADC_SAMPLE_RATE/(MS_DECIMATION_FACTOR*2))
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// 2° stadio
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#define ST2_BUFFER_SIZE (256)
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#define ST2_DECIMATION_FACTOR (4)
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#define ST2_OUT_SAMPLE_RATE (ST1_OUT_SAMPLE_RATE/ST2_DECIMATION_FACTOR)
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#define ST2_FILTER_BLOCK_SIZE (ST2_BUFFER_SIZE)
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#define ST2_FILTER_TAP_NUM (128)
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#define LF_BUFFER_SIZE (ST2_BUFFER_SIZE/ST2_DECIMATION_FACTOR)
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// audio filter
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#define AUDIO_FILTER_TAP_NUM 128
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#define AUDIO_FILTER_FREQ_DEF (1250)
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#define AUDIO_FILTER_FREQ_MAX (DAC_SAMPLE_RATE/2)
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#define AUDIO_FILTER_BW_DEF (2000)
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#define AUDIO_FILTER_BW_MAX (DAC_SAMPLE_RATE/2)
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#define AUDIO_FILTER_BETA_DEF (16)
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#define AUDIO_FILTER_BLOCK_SIZE LF_BUFFER_SIZE
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#define RX_SMETER_SCALE 4
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extern uint8_t rx_signal, rx_signal_last;
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extern q31_t rx_nco1_increment;
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// filtro st2
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extern arm_fir_decimate_instance_q31 st2_filter_I_struct;
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extern arm_fir_decimate_instance_q31 st2_filter_Q_struct;
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extern q31_t st2_filter_I_state[ST2_FILTER_BLOCK_SIZE + ST2_FILTER_TAP_NUM - 1];
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extern q31_t st2_filter_Q_state[ST2_FILTER_BLOCK_SIZE + ST2_FILTER_TAP_NUM - 1];
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extern int32_t st2_filter_taps[ST2_FILTER_TAP_NUM];
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extern int32_t st2_wide_taps[ST2_FILTER_TAP_NUM];
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// filtro audio
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extern arm_fir_instance_q31 audio_filter_struct;
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extern q31_t audio_filter_state[AUDIO_FILTER_BLOCK_SIZE + AUDIO_FILTER_TAP_NUM - 1];
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extern int32_t audio_filter_coeffs[AUDIO_FILTER_TAP_NUM];
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// mix
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void rx_mixer(uint16_t *in, uint16_t size, q31_t *I_out, q31_t *Q_out, int32_t nco_freq);
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// demodulatori
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void ssb_demodulator(q31_t *in_I, q31_t *in_Q, uint16_t size, q31_t *out, q31_t nco_freq);
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void dc_demodulator(q31_t *in, uint16_t size, q31_t *out);
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void am_demodulator(q31_t *in_I, q31_t *in_Q, uint16_t size, q31_t *out);
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// filtri
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// void filter_init(void);
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void st2_filter_init(void);
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void audio_filter_init(void);
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void audio_filter_generate_coeffs(int32_t *Coeffs, uint32_t freq, uint32_t bw, uint8_t beta);
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q31_t hb_fir15(q31_t * samples_ringbuf, uint8_t sample_index, uint8_t buff_size_mask, q31_t * coefficients);
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#endif
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