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radio.cpp
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radio.cpp
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/*
File: radio.cpp
Project: PixelRadio, an RBDS/RDS FM Transmitter (QN8027 Digital FM IC)
Version: 1.1.0
Creation: Dec-16-2021
Revised: Jun-13-2022
Revision History: See PixelRadio.cpp
Project Leader: T. Black (thomastech)
Contributors: thomastech
(c) copyright T. Black 2021-2022, Licensed under GNU GPL 3.0 and later, under this license absolutely no warranty is given.
This Code was formatted with the uncrustify extension.
*/
// *********************************************************************************************
#include <Arduino.h>
#include <ArduinoLog.h>
#include <Wire.h>
#include "PixelRadio.h"
#include "globals.h"
#include "language.h"
#include "QN8027Radio.h"
// *********************************************************************************************
extern QN8027Radio radio;
// *********************************************************************************************
// calibrateAntenna(): Calibrate the QN8027 Antenna Interface. On exit, true if Calibration OK.
// This is an undocumented feature that was found during PixelRadio project development.
// This routine is called once during startup(). Takes about 2 Secs to execute.
bool calibrateAntenna(void)
{
bool successFlg = true;
char logBuff[85];
uint8_t regVal1;
uint8_t regVal2;
radio.setFrequency(108.0F); // High end of FM tuning range.
waitForIdle(50);
radio.Switch(OFF);
waitForIdle(15);
radio.Switch(ON);
waitForIdle(50);
radio.reCalibrate();
waitForIdle(120);
regVal1 = radio.read1Byte(ANT_REG);
radio.setFrequency(85.0F); // Low end of FM tuning range.
waitForIdle(50);
radio.Switch(OFF);
waitForIdle(15);
radio.Switch(ON);
waitForIdle(50);
radio.reCalibrate();
waitForIdle(120);
regVal2 = radio.read1Byte(ANT_REG);
sprintf(logBuff, "-> QN8027 RF Port Test: Low RF Range= 0x%02X, High RF Range= 0x%02X", regVal1, regVal2);
Log.verboseln(logBuff);
if (regVal1 == 0x00 && regVal2 == 0x00) {
successFlg = false;
Log.errorln("-> QN8027 RF Port Calibration Failed, Possible Oscillator Failure.");
}
else if ((regVal1 <= 0x01) || (regVal1 >= 0x1f) || (regVal2 <= 0x01) || (regVal2 >= 0x1f)) {
successFlg = false;
Log.errorln("-> QN8027 RF Port has Poor Calibration, RF Tuning Range Impaired.");
}
else {
successFlg = true;
Log.infoln("-> QN8027 RF Port Matching OK, Calibration Successful.");
}
/*
radio.setFrequency(103.0F); // Recalibrate at middle FM range.
waitForIdle(50);
radio.Switch(OFF);
waitForIdle(15);
radio.Switch(ON);
waitForIdle(50);
*/
radio.reCalibrate();
waitForIdle(120);
setRfCarrier();
waitForIdle(50);
return successFlg;
}
// *********************************************************************************************
//
// checkRadioIsPresent(): Check to see if QN8027 FM Radio Chip is installed. Return true if Ok.
bool checkRadioIsPresent(void) {
Wire.beginTransmission(QN8027_I2C_ADDR);
if (Wire.endTransmission(true) == 0) { // Receive 0 = success (ACK response)
return true;
}
return false;
}
/*
// *********************************************************************************************
// initRadioChip(); Initialize the QN8027 FM Radio Chip.
// This is a debug function, not for production USE.
uint8_t initRadioChipDebug(void) {
uint8_t testCode = FM_TEST_OK;
Log.infoln("Initializing QN8027 FM Radio Chip ...");
Serial.printf("Read 0x06 should be 0x44, is %02x\r\n", radio.read1Byte(0x06));
radio.write1Byte(0x00,0x81);
delay(28);
radio.write1Byte(0x03,0x3A);
radio.write1Byte(0x04,0x33);
radio.write1Byte(0x10,0x78);
radio.write1Byte(0x1F,0x00);
radio.write1Byte(0x00,0x41);
delay(17);
radio.write1Byte(0x00,0x01);
delay(20);
radio.write1Byte(0x18,0xE4);
radio.write1Byte(0x18,0xF0);
radio.write1Byte(0x00,0x31);
radio.write1Byte(0x81,0x6A);
radio.write1Byte(0x02,0x87);
Serial.printf("Read 0x10 should be 0x78, is %02x\r\n", radio.read1Byte(0x10));
radio.write1Byte(0x10,0x78);
Serial.printf("Read 0x00 should be 0x31, is %02x\r\n", radio.read1Byte(0x00));
radio.write1Byte(0x00,0x11);
Serial.printf("Read 0x00 should be 0x11, is %02x\r\n", radio.read1Byte(0x00));
radio.write1Byte(0x00,0x31);
Serial.printf("Read 0x00 should be 0x31, is %02x\r\n", radio.read1Byte(0x00));
radio.write1Byte(0x00,0x39);
Serial.printf("Read 0x00 should be 0x39, is %02x\r\n", radio.read1Byte(0x00));
radio.write1Byte(0x00,0x29);
radio.write1Byte(0x01,0x00);
Serial.printf("Read 0x00 should be 0x29, is %02x\r\n", radio.read1Byte(0x00));
radio.write1Byte(0x00,0x29);
Serial.printf("Read 0x00 should be 0x29, is %02x\r\n", radio.read1Byte(0x00));
radio.write1Byte(0x00,0x21);
Serial.printf("Read 0x00 should be 0x21, is %02x\r\n", radio.read1Byte(0x00));
radio.write1Byte(0x00,0x21);
delay(200);
Serial.printf("Read 0x00 should be 0x21, is %02x\r\n", radio.read1Byte(0x00));
radio.write1Byte(0x00,0x21);
return testCode;
}
*/
// *********************************************************************************************
// initRadioChip(); Initialize the QN8027 FM Radio Chip. Returns Test Result Code.
uint8_t initRadioChip(void) {
bool successFlg = true;
uint8_t testCode = FM_TEST_OK;
uint8_t regVal;
char logBuff[50];
Log.infoln("Initializing QN8027 FM Radio Chip ...");
if (checkRadioIsPresent()) {
Log.verboseln("-> QN8027 is Present");
}
else {
Log.errorln("-> QN8027 is Missing");
return FM_TEST_FAIL;
}
regVal = radio.read1Byte(CID1_REG);
if ((regVal > 0x00) && ((regVal & 0x0C) == 0x00)) {
successFlg = true;
sprintf(logBuff, "-> CID1 Chip Family ID: 0x%02X", regVal);
Log.verboseln(logBuff);
}
else {
sprintf(logBuff, "-> Incorrect CID1 Chip Family ID: 0x%02X", regVal);
Log.errorln(logBuff);
// return FM_TEST_FAIL;
}
regVal = radio.read1Byte(CID2_REG);
if ((regVal & 0xF0) == 0x40) {
successFlg = true;
sprintf(logBuff, "-> CID2 Chip Version: 0x%02X", regVal);
Log.verboseln(logBuff);
}
else {
sprintf(logBuff, "-> Incorrect CID2 Version: 0x%02X", regVal);
Log.errorln(logBuff);
// return FM_TEST_FAIL;
}
radio.reset();
delay(30);
// sprintf(logBuff,"Radio Reset Status is: %02X", radio.getStatus());
// Log.infoln(logBuff);
radio.setClockSource(0x00); // XTAL on pins 1 & 2.
// delay(5);
radio.setCrystalFreq(12);
// delay(5);
radio.setCrystalCurrent(30); // 30% of 400uA Max = 120uA.
// delay(5);
// sprintf(logBuff,"Radio XTal Status is: %02X", radio.getStatus());
// Log.infoln(logBuff);
radio.setTxFreqDeviation(0x81); // 75Khz, Total Broadcast channel Bandwidth
// delay(10);
// sprintf(logBuff,"Radio FreqDev Status is: %02X", radio.getStatus());
// Log.infoln(logBuff);
radio.setTxPilotFreqDeviation(9); // Use default 9% (6.75KHz) Pilot Tone Deviation.
// delay(10);
// sprintf(logBuff,"Radio TxPilotDeviation Status is: %02X", radio.getStatus());
// Log.infoln(logBuff);
setRfPower();
waitForIdle(25);
// sprintf(logBuff,"Radio Tx Power Status is: %02X", radio.getStatus());
// Log.infoln(logBuff);
for (uint8_t i = 0; i < RADIO_CAL_RETRY; i++) { // Allow several attempts to get good port matching results.
if (calibrateAntenna()) { // QN8027 RF Port Matching OK, exit.
testCode = FM_TEST_OK;
break;
}
else {
testCode = FM_TEST_VSWR; // Report High VSWR.
if (i < RADIO_CAL_RETRY - 1) {
sprintf(logBuff, "-> Retesting QN8027 RF Port Matching, Retry #%d", i + 1);
Log.warningln(logBuff);
}
}
}
waitForIdle(50);
// sprintf(logBuff,"Calibrate Antenna Status is: %02X", radio.getStatus());
// Log.infoln(logBuff);
setPreEmphasis();
setVgaGain(); // Tx Input Buffer Gain.
setDigitalGain();
setAudioImpedance();
waitForIdle(10);
// sprintf(logBuff,"Radio Audio Configuration Status: %02X", radio.getStatus());
// Log.infoln(logBuff);
radio.MonoAudio(!stereoEnbFlg);
delay(5);
// sprintf(logBuff,"Radio Mono Audio Status is: %02X", radio.getStatus());
// Log.infoln(logBuff);
radio.scrambleAudio(OFF);
delay(5);
// sprintf(logBuff,"Radio Privacy Status is: %02X", radio.getStatus());
// Log.infoln(logBuff);
radio.clearAudioPeak();
delay(5);
// sprintf(logBuff,"Radio Clear Peak Status is: %02X", radio.getStatus());
// Log.infoln(logBuff);
radio.mute(muteFlg);
delay(5);
// sprintf(logBuff,"Radio Clear Peak Status is: %02X", radio.getStatus());
// Log.infoln(logBuff);
setRfAutoOff();
// sprintf(logBuff,"Radio RF Auto Shutoff Status is: %02X", radio.getStatus());
// Log.infoln(logBuff);
radio.Switch(uint8_t(rfCarrierFlg));
waitForIdle(50);
// sprintf(logBuff,"Radio Switch Status is: %02X", radio.getStatus());
// Log.infoln(logBuff);
radio.setFrequency((float(fmFreqX10)) / 10.0f);
waitForIdle(50);
sprintf(logBuff, "-> Radio Frequency: %3.1f", radio.getFrequency());
Log.infoln(logBuff);
radio.setRDSFreqDeviation(10); // RDS Freq Deviation = 0.35KHz * Value.
delay(1);
radio.RDS(ON);
waitForIdle(20);
// sprintf(logBuff,"Radio RF Carrier Status is: %02X", radio.getStatus());
// Log.infoln(logBuff);
radio.updateSYSTEM_REG(); // This is needed to Start FM Broadcast.
waitForIdle(20);
radio.clearAudioPeak();
delay(1);
sprintf(logBuff, "-> Radio Status: %02X", (radio.getStatus() & 0x07));
Log.infoln(logBuff);
radio.setPiCode(rdsLocalPiCode);
radio.setPtyCode(rdsLocalPtyCode);
if (successFlg) {
Log.infoln("-> QN8027 Initialization Complete.");
}
else {
Log.errorln("-> QN8027 Failed Initialization.");
}
/*
// DEBUG ONLY.
for (int i = 0; i <= 0x1F; i++) {
sprintf(logBuff, "Radio Register %02X is: %02X", i, radio.read1Byte(i));
Log.infoln(logBuff);
}
*/
return testCode;
}
// *********************************************************************************************
// measureAudioLevel(): Measure the Peak Audio Level. Max 675mV.
uint16_t measureAudioLevel(void) {
uint16_t mV = 0;
mV = radio.getStatus() >> 4;
mV = mV * 45; // Audio Peak is 45mV per count.
radio.clearAudioPeak();
return mV;
}
// *********************************************************************************************
// setVgaGain(): Set the Tx Input Buffer Gain (Analog Gain) on the QN8027 chip.
void setVgaGain(void)
{
uint8_t gainVal = 0;
// char logBuff[80];
// sprintf(logBuff, "-> Input Buffer Gain Set to: %s.", vgaGainStr.c_str());
// Log.verboseln(logBuff);
if (vgaGainStr == VGA_GAIN0_STR) {
gainVal = 0x00;
}
else if (vgaGainStr == VGA_GAIN1_STR) {
gainVal = 0x01;
}
else if (vgaGainStr == VGA_GAIN2_STR) {
gainVal = 0x02;
}
else if (vgaGainStr == VGA_GAIN3_STR) {
gainVal = 0x03;
}
else if (vgaGainStr == VGA_GAIN4_STR) {
gainVal = 0x04;
}
else if (vgaGainStr == VGA_GAIN5_STR) {
gainVal = 0x05;
}
else {
Log.errorln("setVgaGain: Invalid Value, Using Default");
vgaGainStr = VGA_GAIN3_STR;
gainVal = 0x03;
}
delay(5);
radio.setTxInputBufferGain(gainVal);
delay(5);
}
// *********************************************************************************************
// setAudioMute(): Control the Audio Mute on the QN8027 chip.
void setAudioMute(void)
{
uint8_t mute;
// char logBuff[40];
// sprintf(logBuff, "-> Audio Mute Set to: %s", muteFlg ? "On (Muted)." : "Off.");
// Log.verboseln(logBuff);
if (muteFlg) {
mute = ON;
}
else {
mute = OFF;
}
delay(5);
radio.mute(mute);
delay(5);
}
// *********************************************************************************************
// setAudioImpedance(): Set the Audio Input Impedance on the QN8027 chip.
void setAudioImpedance(void)
{
uint8_t impedVal = 0;
// char logBuff[60];
// sprintf(logBuff, "-> Audio Impedance Set to: %s.", inpImpedStr.c_str());
// Log.verboseln(logBuff);
if (inpImpedStr == INP_IMP05K_STR) {
impedVal = 5;
}
else if (inpImpedStr == INP_IMP10K_STR) {
impedVal = 10;
}
else if (inpImpedStr == INP_IMP20K_STR) {
impedVal = 20;
}
else if (inpImpedStr == INP_IMP40K_STR) {
impedVal = 40;
}
else {
Log.errorln("setAudioImpedance: Invalid Value, Using Default");
inpImpedStr = INP_IMP20K_STR;
impedVal = 20;
}
delay(5);
radio.setAudioInpImp(impedVal);
delay(5);
}
// *********************************************************************************************
// setDigitalGain(): Set the Tx Digital Gain on the QN8027 chip.
void setDigitalGain(void)
{
uint8_t gainVal = 0;
// char logBuff[60];
// sprintf(logBuff, "-> Digital Audio Gain Set to: %s.", digitalGainStr.c_str());
// Log.verboseln(logBuff);
if (digitalGainStr == DIG_GAIN0_STR) {
gainVal = 0; // 0dB.
}
else if (digitalGainStr == DIG_GAIN1_STR) {
gainVal = 1; // 1dB.
}
else if (digitalGainStr == DIG_GAIN2_STR) {
gainVal = 2; // 2dB.
}
else {
Log.errorln("setDigitalGain: Invalid Value, Using Default");
digitalGainStr = DIG_GAIN0_STR;
gainVal = 0;
}
delay(5);
radio.setTxDigitalGain(gainVal);
delay(5);
}
// *********************************************************************************************
// setFrequency(): Set the Radio Frequency on the QN8027.
void setFrequency(void)
{
float freq;
uint8_t rfOn;
// char logBuff[60];
// sprintf(logBuff, "-> Radio Frequency Set to: %d.", fmFreqX10);
// Log.verboseln(logBuff);
freq = (float(fmFreqX10)) / 10.0f;
if (rfCarrierFlg) {
rfOn = ON;
}
else {
rfOn = OFF;
}
waitForIdle(5);
radio.Switch(OFF); // Turn Off Carrier.
waitForIdle(5);
radio.setFrequency(freq);
waitForIdle(25);
radio.Switch(rfOn); // Restore Carrier to user's state.
waitForIdle(25);
}
// *********************************************************************************************
// setMonoAudio(): Control the Audio Stereo/Mono mode on the QN8027 chip.
void setMonoAudio(void)
{
uint8_t mono;
// char logBuff[40];
// sprintf(logBuff, "-> Audio Set to: %s", stereoEnbFlg ? "Mono." : "Stereo.");
// Log.verboseln(logBuff);
if (stereoEnbFlg) {
mono = OFF;
}
else {
mono = ON;
}
delay(5);
radio.MonoAudio(mono);
delay(5);
}
// *********************************************************************************************
// ssetPreEmphasis(): Set the QN8027 chip's pre-Emphasis.
// ON = 50uS (Eur/UK/Australia), OFF = 75uS (North America/Japan).
void setPreEmphasis(void)
{
uint8_t emphVal;
uint8_t rfOn;
// char logBuff[60];
// sprintf(logBuff, "-> Pre-Emphasis Set to: %s.", preEmphasisStr.c_str());
// Log.verboseln(logBuff);
if (preEmphasisStr == PRE_EMPH_EUR_STR) {
emphVal = ON;
}
else if (preEmphasisStr == PRE_EMPH_USA_STR) {
emphVal = OFF;
}
else {
Log.errorln("setPreEmphasis: Invalid Value, Using Default");
preEmphasisStr = PRE_EMPH_USA_STR;
emphVal = OFF;
}
if (rfCarrierFlg) {
rfOn = ON;
}
else {
rfOn = OFF;
}
delay(1);
radio.Switch(OFF); // Turn Off Carrier.
delay(1);
radio.setPreEmphTime50(emphVal);
waitForIdle(10);
radio.Switch(rfOn); // Restore Carrier to user's state.
waitForIdle(25);
}
// *********************************************************************************************
// setRfAutoOff():
// IMPORTANT: Sending RDS Messages and/or using updateUiAudioLevel() Will prevent 60S Turn Off.
// rfAutoOff = true: Turn-off RF Carrier if Audio is missing for > 60 seconds.
// rfAutoOff = false: Never turn off.
void setRfAutoOff(void)
{
uint8_t autoOff;
uint8_t rfOn;
// char logBuff[60];
// sprintf(logBuff, "-> RF Auto Off Set to: %s", rfAutoFlg ? "60S Timeout." : "Always On.");
// Log.verboseln(logBuff);
if (rfAutoFlg) {
autoOff = ON;
}
else {
autoOff = OFF;
}
if (rfCarrierFlg) {
rfOn = ON;
}
else {
rfOn = OFF;
}
radio.Switch(OFF); // Turn Off Carrier.
delay(5);
radio.radioNoAudioAutoOFF(autoOff);
delay(5);
radio.Switch(rfOn); // Restore Carrier to user's state.
// char logBuff[60];
// sprintf(logBuff, "AutoOff Value = %02Xh\r\n", radio.read1Byte(GPLT_REG));
// Log.verbose()
}
// *********************************************************************************************
// setRfCarrier(): Set the QN8027 chip's RF Carrier Output (On/Off).
void setRfCarrier(void)
{
uint8_t rfOn;
// char logBuff[60];
// sprintf(logBuff, "-> RF Carrier Set to: %s", rfCarrierFlg ? "On" : "Off");
// Log.verboseln(logBuff);
if (rfCarrierFlg) {
rfOn = ON;
}
else {
rfOn = OFF;
}
waitForIdle(10);
radio.Switch(rfOn); // Update QN8027 Carrier.
waitForIdle(25);
}
// *********************************************************************************************
// setRfPower(): Set the QN8027 chip's RF Power Output. Max 121dBuVp.
// Note: Power is not changed until RF Carrier is toggled Off then On.
void setRfPower(void)
{
uint8_t pwrVal = RF_HIGH_POWER;
// char logBuff[60];
// sprintf(logBuff, "-> RF Power Set to: %s", rfPowerStr.c_str());
// Log.verboseln(logBuff);
if (rfPowerStr == RF_PWR_LOW_STR) {
pwrVal = RF_LOW_POWER;
}
else if (rfPowerStr == RF_PWR_MED_STR) {
pwrVal = RF_MED_POWER;
}
else if (rfPowerStr == RF_PWR_HIGH_STR) {
pwrVal = RF_HIGH_POWER;
}
else {
Log.errorln("setRfPower: Invalid Value, Using High Power");
rfPowerStr = RF_PWR_HIGH_STR;
pwrVal = RF_HIGH_POWER;
}
waitForIdle(10);
radio.setTxPower(pwrVal);
waitForIdle(10);
if (rfCarrierFlg) {
radio.Switch(OFF); // Turn Off Carrier.
}
setRfCarrier(); // Restore runtime RF Carrier state.
waitForIdle(50);
}
// *********************************************************************************************
// updateOnAirSign(): Turn on the "On Air" LED Sign if RF Carrier is present.
void updateOnAirSign(void)
{
if (rfCarrierFlg) {
digitalWrite(ON_AIR_PIN, SIGN_ON);
}
else {
digitalWrite(ON_AIR_PIN, SIGN_OFF);
}
}
// *********************************************************************************************
// updateRadioSettings(): Update Any Radio Setting that has changed by the Web UI.
// This routine must be placed in main loop();
// QN8027 specific settings must not be changed in the Web UI Callbacks due to ESP32 core
// limitations. So instead the callbacks set a flag that tells this routine to perform the action.
void updateRadioSettings(void)
{
if (newVgaGainFlg) {
newVgaGainFlg = false;
setVgaGain(); // Update analog (VGA) gain setting on QN8027 FM Radio Chip.
}
if (newAutoRfFlg) {
newAutoRfFlg = false;
setRfAutoOff();
}
if (newDigGainFlg) {
newDigGainFlg = false;
setDigitalGain(); // Update setting on QN8027 FM Radio Chip.
}
if (newFreqFlg) {
newFreqFlg = false;
setFrequency();
}
if (newInpImpFlg) {
newInpImpFlg = false;
setAudioImpedance(); // Update Impednace setting on QN8027 FM Radio Chip.
}
if (newAudioModeFlg) {
newAudioModeFlg = false;
setMonoAudio();
}
if (newMuteFlg) {
newMuteFlg = false;
setAudioMute(); // Update QN8027 Mute Register.
}
if (newPreEmphFlg) {
newPreEmphFlg = false;
setPreEmphasis(); // Update QN8027 Radio Chip's setting.
}
if (newRfPowerFlg) {
newRfPowerFlg = false;
setRfPower(); // Update RF Power Setting on QN8027 FM Radio Chip.
}
if (newCarrierFlg) { // Update RF Carrier last for best results.
newCarrierFlg = false;
setRfCarrier();
}
}
// *********************************************************************************************
// waitForIdle(): Wait for QN8027 to enter Idle State. This means register command has executed.
void waitForIdle(uint16_t waitMs) {
// char logBuff[50];
uint8_t stateCode1;
uint8_t stateCode2;
stateCode1 = radio.getStatus() & 0x07;
// sprintf(logBuff,"waitForIdle Start Status is: %02X", stateCode1);
// Serial.println(logBuff);
delay(5); // Fixed Entry Delay.
if (waitMs <= 5) {
return; // Nothing more to do, exit.
}
else if (waitMs < 10) {
waitMs = 5;
}
else {
waitMs -= 5;
}
for (int i = 0; i < waitMs / 5; i++) {
delay(5);
stateCode2 = radio.getStatus() & 0x07;
// sprintf(logBuff,"waitForIdle Cnt: #%d, Status is: %02X", i, stateCode2);
// Serial.println(logBuff);
if ((stateCode2 == 0x02) || (stateCode2 == 0x05)) {
break;
}
else if (stateCode1 != stateCode2) {
radio.getStatus(); // Clear next status byte.
break;
}
}
// sprintf(logBuff,"waitForIdle End Status is: %02X", (radio.getStatus() & 0x07));
// Serial.println(logBuff);
}
// *********************************************************************************************
// OEF