AFSK1200 modem context.
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#include <afsk.h>
Data Fields |
KFile | fd |
| Base "class".
|
int | adc_ch |
| ADC channel to be used by the demodulator.
|
int | dac_ch |
| DAC channel to be used by the modulator.
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uint8_t | sample_count |
| Current sample of bit for output data.
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uint8_t | curr_out |
| Current character to be modulated.
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uint8_t | tx_bit |
| Mask of current modulated bit.
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bool | bit_stuff |
| True if bit stuff is allowed, false otherwise.
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uint8_t | stuff_cnt |
| Counter for bit stuffing.
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uint16_t | phase_acc |
| DDS phase accumulator for generating modulated data.
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uint16_t | phase_inc |
| Current phase increment for current modulated bit.
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FIFOBuffer | delay_fifo |
| Delay line used to delay samples by (SAMPLEPERBIT / 2)
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int8_t | delay_buf [SAMPLEPERBIT/2+1] |
| Buffer for delay FIFO.
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FIFOBuffer | rx_fifo |
| FIFO for received data.
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uint8_t | rx_buf [CONFIG_AFSK_RX_BUFLEN] |
| FIFO rx buffer.
|
FIFOBuffer | tx_fifo |
| FIFO for transmitted data.
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uint8_t | tx_buf [CONFIG_AFSK_TX_BUFLEN] |
| FIFO tx buffer.
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int16_t | iir_x [2] |
| IIR filter X cells, used to filter sampled data by the demodulator.
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int16_t | iir_y [2] |
| IIR filter Y cells, used to filter sampled data by the demodulator.
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uint8_t | sampled_bits |
| Bits sampled by the demodulator are here.
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int8_t | curr_phase |
| Current phase, needed to know when the bitstream at ADC speed should be sampled.
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uint8_t | found_bits |
| Bits found by the demodulator at the correct bitrate speed.
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volatile bool | sending |
| True while modem sends data.
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volatile int | status |
| AFSK modem status.
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Hdlc | hdlc |
| Hdlc context.
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uint16_t | preamble_len |
| Preamble length.
|
uint16_t | trailer_len |
| Trailer length.
|
Detailed Description
AFSK1200 modem context.
Definition at line 93 of file afsk.h.
Field Documentation
Buffer for delay FIFO.
The 1 is added because the FIFO macros need 1 byte more to handle a buffer (SAMPLEPERBIT / 2) bytes long.
Definition at line 134 of file afsk.h.
Bits found by the demodulator at the correct bitrate speed.
Definition at line 168 of file afsk.h.
Preamble length.
When the AFSK modem wants to send data, before sending the actual data, shifts out preamble_len HDLC_FLAG characters. This helps to synchronize the demodulator filters on the receiver side.
Definition at line 188 of file afsk.h.
Current sample of bit for output data.
Definition at line 105 of file afsk.h.
Bits sampled by the demodulator are here.
Since ADC samplerate is higher than the bitrate, the bits here are SAMPLEPERBIT times the bitrate.
Definition at line 159 of file afsk.h.
AFSK modem status.
If 0 all is ok, otherwise errors are present.
Definition at line 177 of file afsk.h.
Trailer length.
After sending the actual data, the AFSK shifts out trailer_len HDLC_FLAG characters. This helps to synchronize the demodulator filters on the receiver side.
Definition at line 196 of file afsk.h.
The documentation for this struct was generated from the following file: