Merge pull request #373 from darksidelemm/fsk4

Fsk4
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/*
RadioLib FSK4 Transmit Example
This example sends an example FSK-4 'Horus Binary' message using SX1278's
FSK modem.
This signal can be demodulated using a SSB demodulator (SDR or otherwise), and
horusdemodlib: https://github.com/projecthorus/horusdemodlib/wiki
Other modules that can be used for FSK4:
(Untested, but work with RTTY to are likely to work here too)
- SX127x/RFM9x
- RF69
- SX1231
- CC1101
- SX126x
- nRF24
- Si443x/RFM2x
- SX128x
For default module settings, see the wiki page
https://github.com/jgromes/RadioLib/wiki/Default-configuration
For full API reference, see the GitHub Pages
https://jgromes.github.io/RadioLib/
*/
// include the library
#include <RadioLib.h>
// SX1278 has the following connections:
// NSS pin: 10
// DIO0 pin: 2
// RESET pin: 9
// DIO1 pin: 3
SX1278 radio = new Module(10, 2, 9, 3);
// or using RadioShield
// https://github.com/jgromes/RadioShield
//SX1278 radio = RadioShield.ModuleA;
// create FAK4 client instance using the FSK module
FSK4Client fsk4(&radio);
// A 'canned' encoded Horus Binary telemetry packet.
// Refer here for packet format information:
// https://github.com/projecthorus/horusdemodlib/wiki/2---Modem-Details#horus-binary-v1-mode-4-fsk
// After demodulation, deinterleaving, and descrambling, this results in a packet: 00000001172D0000000000000000D20463010AFF2780
// This decodes to the Habitat-compatible telemetry string: $$4FSKTEST,0,01:23:45,0.00000,0.00000,1234,99,1,10,5.00*ABCD
uint8_t sample_packet[] = {
0x45, 0x24, 0x24, 0x48, 0x2F, 0x12, 0x16, 0x08, 0x15, 0xC1,
0x49, 0xB2, 0x06, 0xFC, 0x92, 0xEB, 0x93, 0xD7, 0xEE, 0x5D,
0x35, 0xA0, 0x91, 0xDA, 0x8D, 0x5F, 0x85, 0x6B, 0x63, 0x03,
0x6B, 0x60, 0xEA, 0xFE, 0x55, 0x9D, 0xF1, 0xAB, 0xE5, 0x5E,
0xDB, 0x7C, 0xDB, 0x21, 0x5A, 0x19
};
uint8_t sample_packet_len = 45;
void setup() {
Serial.begin(9600);
// initialize SX1278 with default settings
Serial.print(F("[SX1278] Initializing ... "));
int state = radio.beginFSK();
// when using one of the non-LoRa modules for FSK4
// (RF69, CC1101, Si4432 etc.), use the basic begin() method
// int state = radio.begin();
if(state == ERR_NONE) {
Serial.println(F("success!"));
} else {
Serial.print(F("failed, code "));
Serial.println(state);
while(true);
}
// initialize FSK4 client
// NOTE: FSK4 frequency shift will be rounded
// to the nearest multiple of frequency step size.
// The exact value depends on the module:
// SX127x/RFM9x - 61 Hz
// RF69 - 61 Hz
// CC1101 - 397 Hz
// SX126x - 1 Hz
// nRF24 - 1000000 Hz
// Si443x/RFM2x - 156 Hz
// SX128x - 198 Hz
Serial.print(F("[FSK4] Initializing ... "));
// low ("space") frequency: 434.0 MHz
// frequency shift: 270 Hz (actually results in a shift of 244 Hz)
// baud rate: 100 baud
state = fsk4.begin(434.0, 270, 100);
if(state == ERR_NONE) {
Serial.println(F("success!"));
} else {
Serial.print(F("failed, code "));
Serial.println(state);
while(true);
}
}
void loop() {
Serial.print(F("[FSK4] Sending FSK4 data packet ... "));
// send out idle condition for 1000 ms
fsk4.idle();
delay(1000);
// FSK4Client supports the write(uint8_t b) and write(uint8_t* buff, size_t len) method.
// We use the write(uint8_t b) method to send a few bytes of preamble to allow the demodulator
// to lock on to the signal.
fsk4.write(0x1B); fsk4.write(0x1B); fsk4.write(0x1B); fsk4.write(0x1B);
fsk4.write(0x1B); fsk4.write(0x1B); fsk4.write(0x1B); fsk4.write(0x1B);
// We then send the encoded packet.
fsk4.write(sample_packet, sample_packet_len);
Serial.println(F("done!"));
}

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#include "protocols/Morse/Morse.h"
#include "protocols/RTTY/RTTY.h"
#include "protocols/SSTV/SSTV.h"
#include "protocols/FSK4/FSK4.h"
// transport layer protocols
#include "protocols/TransportLayer/TransportLayer.h"

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src/protocols/FSK4/FSK4.cpp Normal file
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#include "FSK4.h"
#if !defined(RADIOLIB_EXCLUDE_FSK4)
FSK4Client::FSK4Client(PhysicalLayer* phy) {
_phy = phy;
#if !defined(RADIOLIB_EXCLUDE_AFSK)
_audio = nullptr;
#endif
}
//#if !defined(RADIOLIB_EXCLUDE_AFSK)
// FSK4Client::FSK4Client(AFSKClient* audio) {
// _phy = audio->_phy;
// _audio = audio;
// }
//#endif
int16_t FSK4Client::begin(float base, uint32_t shift, uint16_t rate) {
// save configuration
_baseHz = base;
_shiftHz = shift;
// calculate duration of 1 bit
_bitDuration = (uint32_t)1000000/rate;
// calculate module carrier frequency resolution
uint32_t step = round(_phy->getFreqStep());
// check minimum shift value
if(shift < step / 2) {
return(ERR_INVALID_RTTY_SHIFT);
}
// round shift to multiples of frequency step size
if(shift % step < (step / 2)) {
_shift = shift / step;
} else {
_shift = (shift / step) + 1;
}
// Write resultant tones into arrays for quick lookup when modulating.
_tones[0] = 0;
_tones[1] = _shift;
_tones[2] = _shift*2;
_tones[3] = _shift*3;
_tonesHz[0] = 0;
_tonesHz[1] = _shiftHz;
_tonesHz[2] = _shiftHz*2;
_tonesHz[3] = _shiftHz*3;
// calculate 24-bit frequency
_base = (base * 1000000.0) / _phy->getFreqStep();
// configure for direct mode
return(_phy->startDirect());
}
void FSK4Client::idle() {
// Idle at Tone 0.
tone(0);
}
size_t FSK4Client::write(uint8_t* buff, size_t len) {
size_t n = 0;
for(size_t i = 0; i < len; i++) {
n += FSK4Client::write(buff[i]);
}
FSK4Client::standby();
return(n);
}
size_t FSK4Client::write(uint8_t b) {
int k;
// Send symbols MSB first.
for (k=0;k<4;k++)
{
// Extract 4FSK symbol (2 bits)
uint8_t symbol = (b & 0xC0) >> 6;
// Modulate
FSK4Client::tone(symbol);
// Shift to next symbol.
b = b << 2;
}
return(1);
}
void FSK4Client::tone(uint8_t i) {
uint32_t start = Module::micros();
transmitDirect(_base + _tones[i], _baseHz + _tonesHz[i]);
while(Module::micros() - start < _bitDuration) {
Module::yield();
}
}
int16_t FSK4Client::transmitDirect(uint32_t freq, uint32_t freqHz) {
#if !defined(RADIOLIB_EXCLUDE_AFSK)
if(_audio != nullptr) {
return(_audio->tone(freqHz));
}
#endif
return(_phy->transmitDirect(freq));
}
int16_t FSK4Client::standby() {
#if !defined(RADIOLIB_EXCLUDE_AFSK)
if(_audio != nullptr) {
return(_audio->noTone());
}
#endif
return(_phy->standby());
}
#endif

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#if !defined(_RADIOLIB_FSK4_H)
#define _RADIOLIB_FSK4_H
#include "../../TypeDef.h"
#if !defined(RADIOLIB_EXCLUDE_FSK4)
#include "../PhysicalLayer/PhysicalLayer.h"
#include "../AFSK/AFSK.h"
/*!
\class FSK4Client
\brief Client for FSK-4 communication. The public interface is the same as Arduino Serial.
*/
class FSK4Client {
public:
/*!
\brief Constructor for FSK-4 mode.
\param phy Pointer to the wireless module providing PhysicalLayer communication.
*/
explicit FSK4Client(PhysicalLayer* phy);
#if !defined(RADIOLIB_EXCLUDE_AFSK)
/*!
\brief Constructor for AFSK mode.
\param audio Pointer to the AFSK instance providing audio.
*/
//explicit FSK4Client(AFSKClient* audio);
#endif
// basic methods
/*!
\brief Initialization method.
\param base Base (space) frequency to be used in MHz (in FSK-4 mode), or the space tone frequency in Hz (in AFSK mode)
\param shift Frequency shift between each tone in Hz.
\param rate Baud rate to be used during transmission.
\returns \ref status_codes
*/
int16_t begin(float base, uint32_t shift, uint16_t rate);
/*!
\brief Send out idle condition (RF tone at mark frequency).
*/
void idle();
size_t write(uint8_t* buff, size_t len);
size_t write(uint8_t b);
#ifndef RADIOLIB_GODMODE
private:
#endif
PhysicalLayer* _phy;
#if !defined(RADIOLIB_EXCLUDE_AFSK)
AFSKClient* _audio;
#endif
uint32_t _base = 0, _baseHz = 0;
uint32_t _shift = 0, _shiftHz = 0;
uint32_t _bitDuration = 0;
uint32_t _tones[4];
uint32_t _tonesHz[4];
void tone(uint8_t i);
int16_t transmitDirect(uint32_t freq = 0, uint32_t freqHz = 0);
int16_t standby();
};
#endif
#endif