#ifndef CONFIG_H
#define CONFIG_H

#include <liquid/liquid.h>

/*** TIMING CONFIG ***/

#define TX_SWITCH_BACKOFF_PREAMBLE_MS          500   // only relevant if packet cannot be decoded
#define TX_SWITCH_BACKOFF_END_OF_PACKET_MS       1
#define TX_SWITCH_BACKOFF_AFTER_RX_ON          500   // time the transceiver must stay in RX mode

/*** LAYER 1 CONFIG ***/

#define SYMBOL_RATE   100e3f

#define PAYLOAD_CHANNEL_CODE   LIQUID_FEC_CONV_V27P34
#define PAYLOAD_MODULATION     LIQUID_MODEM_QAM16

#define HEADER_CHANNEL_CODE   LIQUID_FEC_NONE
#define HEADER_MODULATION     LIQUID_MODEM_QPSK

#define PAYLOAD_CRC_SCHEME    LIQUID_CRC_16

#define PREAMBLE_MSEQ_M       6
#define PREAMBLE_MSEQ_POLY    LIQUID_MSEQUENCE_GENPOLY_M6
#define PREAMBLE_MSEQ_INIT    0x00000001

#define RRC_SPS         4   // samples per symbol
#define RRC_DELAY       7   // delay in symbols
#define RRC_BETA        0.2f

#define TRANSMISSION_RAMP_UP_LEN     64  // symbols
#define TRANSMISSION_RAMP_DOWN_LEN   32  // symbols

/*** SDR CONFIG ***/

#define SDR_IS_FULL_DUPLEX       0

#define SDR_OVERSAMPLING         3  // integer factor!

#define SDR_RX_SAMPLING_RATE     (SYMBOL_RATE * RRC_SPS * SDR_OVERSAMPLING)
#define SDR_TX_SAMPLING_RATE     SDR_RX_SAMPLING_RATE

// actually transmitted or received signal frequencies, NOT the SDR center frequency.
#define SDR_TX_FREQ       434.100e6f
#define SDR_RX_FREQ       434.100e6f

// shift applied in the baseband, to get rid of SDR DC peak. If the value here
// is not 0, software mixing will be done on the received signal.
#define SDR_TX_IF_SHIFT     0.000e6f
#define SDR_RX_IF_SHIFT     0.150e6f

// NOTE: the SDR center frequency will be SDR_RX_FREQ - SDR_RX_IF_SHIFT.

// gain configuration
#define SDR_GAIN_TX_AMP    0.0f   // extra power amplifier. Set to 14.0f to activate.
#define SDR_GAIN_TX_LNA    0.0f   // normal variable gain amplifier.

#define SDR_GAIN_RX_AMP    0.0f   // extra input amplifier. Set to 14.0f to activate.
#define SDR_GAIN_RX_LNA   30.0f   // RF variable gain amplifier.
#define SDR_GAIN_RX_VGA   24.0f   // Baseband variable gain amplifier.

#endif // CONFIG_H