ubitxv6/tuner.cpp

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2020-04-22 00:09:21 -04:00
#include "tuner.h"
#include <Arduino.h>
#include "nano_gui.h"
#include "pin_definitions.h"
#include "si5351.h"
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static const uint32_t THRESHOLD_USB_LSB = 10000000L;
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void saveVFOs()
{
SaveSettingsToEeprom();
}
void switchVFO(Vfo_e new_vfo){
ritDisable();//If we are in RIT mode, we need to disable it before setting the active VFO so that the correct VFO gets it's frequency restored
globalSettings.activeVfo = new_vfo;
setFrequency(GetActiveVfoFreq());
redrawVFOs();
saveVFOs();
}
/**
* Select the properly tx harmonic filters
* The four harmonic filters use only three relays
* the four LPFs cover 30-21 Mhz, 18 - 14 Mhz, 7-10 MHz and 3.5 to 5 Mhz
* Briefly, it works like this,
* - When KT1 is OFF, the 'off' position routes the PA output through the 30 MHz LPF
* - When KT1 is ON, it routes the PA output to KT2. Which is why you will see that
* the KT1 is on for the three other cases.
* - When the KT1 is ON and KT2 is off, the off position of KT2 routes the PA output
* to 18 MHz LPF (That also works for 14 Mhz)
* - When KT1 is On, KT2 is On, it routes the PA output to KT3
* - KT3, when switched on selects the 7-10 Mhz filter
* - KT3 when switched off selects the 3.5-5 Mhz filter
* See the circuit to understand this
*/
void setTXFilters(unsigned long freq){
if (freq > 21000000L){ // the default filter is with 35 MHz cut-off
digitalWrite(PIN_TX_LPF_A, 0);
digitalWrite(PIN_TX_LPF_B, 0);
digitalWrite(PIN_TX_LPF_C, 0);
}
else if (freq >= 14000000L){ //thrown the KT1 relay on, the 30 MHz LPF is bypassed and the 14-18 MHz LPF is allowd to go through
digitalWrite(PIN_TX_LPF_A, 1);
digitalWrite(PIN_TX_LPF_B, 0);
digitalWrite(PIN_TX_LPF_C, 0);
}
else if (freq > 7000000L){
digitalWrite(PIN_TX_LPF_A, 0);
digitalWrite(PIN_TX_LPF_B, 1);
digitalWrite(PIN_TX_LPF_C, 0);
}
else {
digitalWrite(PIN_TX_LPF_A, 0);
digitalWrite(PIN_TX_LPF_B, 0);
digitalWrite(PIN_TX_LPF_C, 1);
}
}
/**
* This is the most frequently called function that configures the
* radio to a particular frequeny, sideband and sets up the transmit filters
*
* The transmit filter relays are powered up only during the tx so they dont
* draw any current during rx.
*
* The carrier oscillator of the detector/modulator is permanently fixed at
* uppper sideband. The sideband selection is done by placing the second oscillator
* either 12 Mhz below or above the 45 Mhz signal thereby inverting the sidebands
* through mixing of the second local oscillator.
*/
void setFrequency(const unsigned long freq,
const bool transmit){
static const unsigned long FIRST_IF = 45005000UL;
setTXFilters(freq);
//Nominal values for the oscillators
uint32_t local_osc_freq = FIRST_IF + freq;
uint32_t ssb_osc_freq = FIRST_IF;//will be changed depending on sideband
uint32_t bfo_osc_freq = globalSettings.usbCarrierFreq;
if(TuningMode_e::TUNE_CW == globalSettings.tuningMode){
if(transmit){
//We don't do any mixing or converting when transmitting
local_osc_freq = freq;
ssb_osc_freq = 0;
bfo_osc_freq = 0;
}
else{
//We offset when receiving CW so that it's audible
if(VfoMode_e::VFO_MODE_USB == GetActiveVfoMode()){
local_osc_freq -= globalSettings.cwSideToneFreq;
ssb_osc_freq += globalSettings.usbCarrierFreq;
}
else{
local_osc_freq += globalSettings.cwSideToneFreq;
ssb_osc_freq -= globalSettings.usbCarrierFreq;
}
}
}
else{//SSB mode
if(VfoMode_e::VFO_MODE_USB == GetActiveVfoMode()){
ssb_osc_freq += globalSettings.usbCarrierFreq;
}
else{
ssb_osc_freq -= globalSettings.usbCarrierFreq;
}
}
si5351bx_setfreq(2, local_osc_freq);
si5351bx_setfreq(1, ssb_osc_freq);
si5351bx_setfreq(0, bfo_osc_freq);
SetActiveVfoFreq(freq);
}
/**
* startTx is called by the PTT, cw keyer and CAT protocol to
* put the uBitx in tx mode. It takes care of rit settings, sideband settings
* Note: In cw mode, doesnt key the radio, only puts it in tx mode
* CW offest is calculated as lower than the operating frequency when in LSB mode, and vice versa in USB mode
*/
void startTx(TuningMode_e tx_mode){
globalSettings.tuningMode = tx_mode;
if (globalSettings.ritOn){
//save the current as the rx frequency
uint32_t rit_tx_freq = globalSettings.ritFrequency;
globalSettings.ritFrequency = GetActiveVfoFreq();
setFrequency(rit_tx_freq,true);
}
else{
if(globalSettings.splitOn){
if(Vfo_e::VFO_B == globalSettings.activeVfo){
globalSettings.activeVfo = Vfo_e::VFO_A;
}
else{
globalSettings.activeVfo = Vfo_e::VFO_B;
}
}
setFrequency(GetActiveVfoFreq(),true);
}
digitalWrite(PIN_TX_RXn, 1);//turn on the tx
globalSettings.txActive = true;
drawTx();
}
void stopTx(){
digitalWrite(PIN_TX_RXn, 0);//turn off the tx
globalSettings.txActive = false;
if(globalSettings.ritOn){
uint32_t rit_rx_freq = globalSettings.ritFrequency;
globalSettings.ritFrequency = GetActiveVfoFreq();
setFrequency(rit_rx_freq);
}
else{
if(globalSettings.splitOn){
if(Vfo_e::VFO_B == globalSettings.activeVfo){
globalSettings.activeVfo = Vfo_e::VFO_A;
}
else{
globalSettings.activeVfo = Vfo_e::VFO_B;
}
}
setFrequency(GetActiveVfoFreq());
}
drawTx();
}
/**
* ritEnable is called with a frequency parameter that determines
* what the tx frequency will be
*/
void ritEnable(unsigned long freq){
globalSettings.ritOn = true;
//save the non-rit frequency back into the VFO memory
//as RIT is a temporary shift, this is not saved to EEPROM
globalSettings.ritFrequency = freq;
}
// this is called by the RIT menu routine
void ritDisable(){
if(globalSettings.ritOn){
globalSettings.ritOn = false;
setFrequency(globalSettings.ritFrequency);
updateDisplay();
}
}
bool autoSelectSidebandChanged(const uint32_t old_frequency)
{
const uint32_t new_freq = GetActiveVfoFreq();
//Transition from below to above the traditional threshold for USB
if(old_frequency < THRESHOLD_USB_LSB && new_freq >= THRESHOLD_USB_LSB){
SetActiveVfoMode(VfoMode_e::VFO_MODE_USB);
setFrequency(new_freq);//Refresh tuning to activate the new sideband mode
return true;
}
//Transition from above to below the traditional threshold for USB
if(old_frequency >= THRESHOLD_USB_LSB && new_freq < THRESHOLD_USB_LSB){
SetActiveVfoMode(VfoMode_e::VFO_MODE_LSB);
setFrequency(new_freq);//Refresh tuning to activate the new sideband mode
return true;
}
return false;
}