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# dspmeterv1
Please also refer to the site below.
https://github.com/soligen2010/dspmeterv1
-------------------------------------------
Standalone Signal Analyzer (I2C Type Signal-Meter) for uBITX - Arduino Nano Version
I do not claim any license for my code.
You may use it in any way. I just hope this will be used for amateur radio.
The other person's source code (CW Morse code) follows the original author's license.
Ian KD8CEC

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/*
FFTFunctions for Nextion LCD and Control MCU
This code is for FFT and CW Decode.
KD8CEC, Ian Lee
-----------------------------------------------------------------------
//The section on CW decode logic is specified at the bottom of this code.
License : I follow the license of the previous code and I do not add any extra constraints.
I hope that the Comment I made or the Comment of OZ1JHM will be maintained.
**********************************************************************/
#include <arduino.h>
#include "i2cmeter1.h"
// Code Referency : http://paulbourke.net/miscellaneous/dft/
// DFT, FFT Wiritten by Paul Bourke, June 1993
void FFT(double *x,double *y, int n, long m)
{
long i,i1,j,k,i2,l,l1,l2;
double c1,c2,tx,ty,t1,t2,u1,u2,z;
short int dir = 0;
/* Do the bit reversal */
i2 = n >> 1;
j = 0;
for (i=0;i<n-1;i++) {
if (i < j) {
tx = x[i];
ty = y[i];
x[i] = x[j];
y[i] = y[j];
x[j] = tx;
y[j] = ty;
}
k = i2;
while (k <= j) {
j -= k;
k >>= 1;
}
j += k;
}
/* Compute the FFT */
c1 = -1.0;
c2 = 0.0;
l2 = 1;
for (l=0;l<m;l++)
{
l1 = l2;
l2 <<= 1;
u1 = 1.0;
u2 = 0.0;
for (j=0;j<l1;j++)
{
for (i=j;i<n;i+=l2)
{
i1 = i + l1;
t1 = u1 * x[i1] - u2 * y[i1];
t2 = u1 * y[i1] + u2 * x[i1];
x[i1] = x[i] - t1;
y[i1] = y[i] - t2;
x[i] += t1;
y[i] += t2;
}
z = u1 * c1 - u2 * c2;
u2 = u1 * c2 + u2 * c1;
u1 = z;
}
c2 = sqrt((1.0 - c1) / 2.0);
if (dir == 1)
c2 = -c2;
c1 = sqrt((1.0 + c1) / 2.0);
}
/* Scaling for forward transform */
/*
if (dir == 1) {
for (i=0;i<n;i++) {
x[i] /= n;
y[i] /= n;
}
}
return 1;
*/
//return(TRUE);
}
double coeff;
void CalculateCoeff(uint8_t freqIndex)
{
float omega;
int targetFrequency = freqIndex * 50 + 300;
int k = (int) (0.5 + ((DECODE_MORSE_SAMPLESIZE * targetFrequency) / SAMPLE_PREQUENCY));
omega = (2.0 * PI * k) / DECODE_MORSE_SAMPLESIZE;
coeff = 2.0 * cos(omega);
}
//=====================================================================
//The CW Decode code refers to the site code below.
//https://k2jji.org/2014/09/18/arduino-base-cw-decoder/
//Some code has been modified, but the original comments remain intact.
// code below is optimal for use in Arduino.
//Thanks to OZ1JHM
//KD8CEC
//=====================================================================
///////////////////////////////////////////////////////////////////////
// CW Decoder made by Hjalmar Skovholm Hansen OZ1JHM VER 1.01 //
// Feel free to change, copy or what ever you like but respect //
// that license is http://www.gnu.org/copyleft/gpl.html //
// Discuss and give great ideas on //
// https://groups.yahoo.com/neo/groups/oz1jhm/conversations/messages //
///////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////
// Read more here http://en.wikipedia.org/wiki/Goertzel_algorithm //
// if you want to know about FFT the http://www.dspguide.com/pdfbook.htm //
///////////////////////////////////////////////////////////////////////////
//int magnitudelimit = 50;
//int magnitudelimit_low = 50;
int magnitudelimit = 30;
int magnitudelimit_low = 30;
char realstate = LOW;
char realstatebefore = LOW;
char filteredstate = LOW;
char filteredstatebefore = LOW;
long laststarttime = 0;
int nbtime = 6; /// ms noise blanker
long starttimehigh;
long highduration;
long lasthighduration;
long hightimesavg;
long lowtimesavg;
long startttimelow;
long lowduration;
char code[20];
uint8_t stop = LOW;
int wpm;
uint8_t cwDecodeHz = 9;
extern void SendCommandStr(char varIndex, char* sendValue);
void printascii(int asciinumber)
{
char rstDecode[4] = {0, 0, 0, 0};
if (asciinumber == 3)
{
}
else if (asciinumber == 4)
{
}
else if (asciinumber == 6)
{
}
else
{
rstDecode[0] = asciinumber;
}
SendCommandStr('b', rstDecode);
//Serial.write(asciinumber);
//if (writeCount++ > 20)
//{
//writeCount = 0;
//Serial.println("");
//}
}
uint8_t docode()
{
if (strcmp(code,".-") == 0) printascii(65);
if (strcmp(code,"-...") == 0) printascii(66);
if (strcmp(code,"-.-.") == 0) printascii(67);
if (strcmp(code,"-..") == 0) printascii(68);
if (strcmp(code,".") == 0) printascii(69);
if (strcmp(code,"..-.") == 0) printascii(70);
if (strcmp(code,"--.") == 0) printascii(71);
if (strcmp(code,"....") == 0) printascii(72);
if (strcmp(code,"..") == 0) printascii(73);
if (strcmp(code,".---") == 0) printascii(74);
if (strcmp(code,"-.-") == 0) printascii(75);
if (strcmp(code,".-..") == 0) printascii(76);
if (strcmp(code,"--") == 0) printascii(77);
if (strcmp(code,"-.") == 0) printascii(78);
if (strcmp(code,"---") == 0) printascii(79);
if (strcmp(code,".--.") == 0) printascii(80);
if (strcmp(code,"--.-") == 0) printascii(81);
if (strcmp(code,".-.") == 0) printascii(82);
if (strcmp(code,"...") == 0) printascii(83);
if (strcmp(code,"-") == 0) printascii(84);
if (strcmp(code,"..-") == 0) printascii(85);
if (strcmp(code,"...-") == 0) printascii(86);
if (strcmp(code,".--") == 0) printascii(87);
if (strcmp(code,"-..-") == 0) printascii(88);
if (strcmp(code,"-.--") == 0) printascii(89);
if (strcmp(code,"--..") == 0) printascii(90);
if (strcmp(code,".----") == 0) printascii(49);
if (strcmp(code,"..---") == 0) printascii(50);
if (strcmp(code,"...--") == 0) printascii(51);
if (strcmp(code,"....-") == 0) printascii(52);
if (strcmp(code,".....") == 0) printascii(53);
if (strcmp(code,"-....") == 0) printascii(54);
if (strcmp(code,"--...") == 0) printascii(55);
if (strcmp(code,"---..") == 0) printascii(56);
if (strcmp(code,"----.") == 0) printascii(57);
if (strcmp(code,"-----") == 0) printascii(48);
if (strcmp(code,"..--..") == 0) printascii(63);
if (strcmp(code,".-.-.-") == 0) printascii(46);
if (strcmp(code,"--..--") == 0) printascii(44);
if (strcmp(code,"-.-.--") == 0) printascii(33);
if (strcmp(code,".--.-.") == 0) printascii(64);
if (strcmp(code,"---...") == 0) printascii(58);
if (strcmp(code,"-....-") == 0) printascii(45);
if (strcmp(code,"-..-.") == 0) printascii(47);
if (strcmp(code,"-.--.") == 0) printascii(40);
if (strcmp(code,"-.--.-") == 0) printascii(41);
if (strcmp(code,".-...") == 0) printascii(95);
if (strcmp(code,"...-..-") == 0) printascii(36);
if (strcmp(code,"...-.-") == 0) printascii(62);
if (strcmp(code,".-.-.") == 0) printascii(60);
if (strcmp(code,"...-.") == 0) printascii(126);
//////////////////
// The specials //
//////////////////
if (strcmp(code,".-.-") == 0) printascii(3);
if (strcmp(code,"---.") == 0) printascii(4);
if (strcmp(code,".--.-") == 0) printascii(6);
}
void Decode_Morse(float magnitude)
{
//magnitudelimit auto Increase
if (magnitude > magnitudelimit_low)
{
magnitudelimit = (magnitudelimit +((magnitude - magnitudelimit)/6)); /// moving average filter
}
if (magnitudelimit < magnitudelimit_low)
magnitudelimit = magnitudelimit_low;
if(magnitude > magnitudelimit*0.6) // just to have some space up
realstate = HIGH;
else
realstate = LOW;
if (realstate != realstatebefore)
laststarttime = millis();
if ((millis()-laststarttime) > nbtime)
{
if (realstate != filteredstate)
{
filteredstate = realstate;
}
}
if (filteredstate != filteredstatebefore)
{
if (filteredstate == HIGH)
{
starttimehigh = millis();
lowduration = (millis() - startttimelow);
}
if (filteredstate == LOW)
{
startttimelow = millis();
highduration = (millis() - starttimehigh);
if (highduration < (2*hightimesavg) || hightimesavg == 0)
{
hightimesavg = (highduration+hightimesavg+hightimesavg)/3; // now we know avg dit time ( rolling 3 avg)
}
if (highduration > (5*hightimesavg) )
{
hightimesavg = highduration+hightimesavg; // if speed decrease fast ..
}
}
}
///////////////////////////////////////////////////////////////
// now we will check which kind of baud we have - dit or dah //
// and what kind of pause we do have 1 - 3 or 7 pause //
// we think that hightimeavg = 1 bit //
///////////////////////////////////////////////////////////////
if (filteredstate != filteredstatebefore)
{
stop = LOW;
if (filteredstate == LOW)
{
if (highduration < (hightimesavg*2) && highduration > (hightimesavg*0.6)) /// 0.6 filter out false dits
{
strcat(code,".");
}
if (highduration > (hightimesavg*2) && highduration < (hightimesavg*6))
{
strcat(code,"-");
wpm = (wpm + (1200/((highduration)/3)))/2; //// the most precise we can do ;o)
}
}
if (filteredstate == HIGH)
{
float lacktime = 1;
if(wpm > 25)lacktime=1.0; /// when high speeds we have to have a little more pause before new letter or new word
if(wpm > 30)lacktime=1.2;
if(wpm > 35)lacktime=1.5;
if (lowduration > (hightimesavg*(2*lacktime)) && lowduration < hightimesavg*(5*lacktime)) // letter space
{
docode();
code[0] = '\0';
}
if (lowduration >= hightimesavg*(5*lacktime))
{ // word space
docode();
code[0] = '\0';
printascii(32);
}
}
}
if ((millis() - startttimelow) > (highduration * 6) && stop == LOW)
{
docode();
code[0] = '\0';
stop = HIGH;
}
/*
if(filteredstate == HIGH)
{
digitalWrite(ledPin, HIGH);
tone(audioOutPin,target_freq);
}
else
{
digitalWrite(ledPin, LOW);
noTone(audioOutPin);
}
*/
realstatebefore = realstate;
lasthighduration = highduration;
filteredstatebefore = filteredstate;
}

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i2cmeter1/i2cmeter1.h Normal file
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/*
Configuration file for Nextion LCD and Control MCU
The parameter can be set according to the CPU used.
KD8CEC, Ian Lee
-----------------------------------------------------------------------
**********************************************************************/
#include <arduino.h>
//================================================================
//COMMUNICATION SECTION
//================================================================
#define USE_SW_SERIAL
extern void SWSerial_Write(uint8_t b);
extern void SWSerial_Print(uint8_t *b);
#ifdef USE_SW_SERIAL
extern void SWSerial_Begin(long speedBaud);
extern int SWSerial_Available(void);
extern int SWSerial_Read(void);
#else
#define PRINT_MAX_LENGTH 30
#endif
//================================================================
//FFT and Decode Morse
//================================================================
#define FFTSIZE 64
#define SAMPLE_PREQUENCY 6000
#define SAMPLESIZE (FFTSIZE * 2)
#define DECODE_MORSE_SAMPLESIZE 48
extern uint8_t cwDecodeHz;
extern int magnitudelimit_low;
//================================================================
//EEPROM Section
//================================================================
#define MAX_FORWARD_BUFF_LENGTH 128
#define EEPROM_DSPTYPE 100
#define EEPROM_SMETER_UART 111
#define EEPROM_SMETER_TIME 112
#define EEPROM_CW_FREQ 120
//#define EEPROM_CW_MAG_LIMIT 121
#define EEPROM_CW_MAG_LOW 122
#define EEPROM_CW_NBTIME 126
#define EEPROM_RTTYDECODEHZ 130
//================================================================
//DEFINE for I2C Command
//================================================================
//S-Meter Address
#define I2CMETER_ADDR 0x58 //changed from 0x6A
//VALUE TYPE============================================
//Signal
#define I2CMETER_CALCS 0x59 //Calculated Signal Meter
#define I2CMETER_UNCALCS 0x58 //Uncalculated Signal Meter
//Power
#define I2CMETER_CALCP 0x57 //Calculated Power Meter
#define I2CMETER_UNCALCP 0x56 //UnCalculated Power Meter
//SWR
#define I2CMETER_CALCR 0x55 //Calculated SWR Meter
#define I2CMETER_UNCALCR 0x54 //Uncalculated SWR Meter
#define SIGNAL_METER_ADC A7
#define POWER_METER_ADC A3
#define SWR_METER_ADC A2

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/*
Softserial for Nextion LCD and Control MCU
KD8CEC, Ian Lee
-----------------------------------------------------------------------
It is a library rewritten in C format based on SoftwareSerial.c.
I tried to use as much as possible without modifying the SoftwareSerial.
But eventually I had to modify the code.
I rewrote it in C for the following reasons.
- Problems occurred when increasing Program Size and Program Memory
- We had to reduce the program size.
Of course, Software Serial is limited to one.
- reduce the steps for transmitting and receiving
useage
extern void SWSerial_Begin(long speedBaud);
extern void SWSerial_Write(uint8_t b);
extern int SWSerial_Available(void);
extern int SWSerial_Read(void);
extern void SWSerial_Print(uint8_t *b);
If you use Softwreserial library instead of this library, you can modify the code as shown below.
I kept the function name of SoftwareSerial so you only need to modify a few lines of code.
define top of source code
#include <SoftwareSerial.h>
SoftwareSerial sSerial(10, 11); // RX, TX
replace source code
SWSerial_Begin to sSerial.begin
SWSerial_Write to sSerial.write
SWSerial_Available to sSerial.available
SWSerial_Read to sSerial.read
KD8CEC, Ian Lee
-----------------------------------------------------------------------
License
All licenses for the source code are subject to the license of the original source SoftwareSerial Library.
However, if you use or modify this code, please keep the all comments in this source code.
KD8CEC
-----------------------------------------------------------------------
License from SoftwareSerial
-----------------------------------------------------------------------
SoftwareSerial.cpp (formerly NewSoftSerial.cpp) -
Multi-instance software serial library for Arduino/Wiring
-- Interrupt-driven receive and other improvements by ladyada
(http://ladyada.net)
-- Tuning, circular buffer, derivation from class Print/Stream,
multi-instance support, porting to 8MHz processors,
various optimizations, PROGMEM delay tables, inverse logic and
direct port writing by Mikal Hart (http://www.arduiniana.org)
-- Pin change interrupt macros by Paul Stoffregen (http://www.pjrc.com)
-- 20MHz processor support by Garrett Mace (http://www.macetech.com)
-- ATmega1280/2560 support by Brett Hagman (http://www.roguerobotics.com/)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
The latest version of this library can always be found at
http://arduiniana.org.
*/
#include "i2cmeter1.h"
#ifdef USE_SW_SERIAL
//================================================================
//Public Variable
//================================================================
#define TX_PIN 9
#define RX_PIN 8
#define _SS_MAX_RX_BUFF 35 // RX buffer size
#define PRINT_MAX_LENGTH 30
//================================================================
//Internal Variable from SoftwareSerial.c and SoftwareSerial.h
//================================================================
//variable from softwareserial.c and softwareserial.h
static uint8_t swr_receive_buffer[_SS_MAX_RX_BUFF];
volatile uint8_t *_transmitPortRegister; //Write Port Register
uint8_t transmit_RegMask; //use Mask bit 1
uint8_t transmit_InvMask; //use mask bit 0
volatile uint8_t *_receivePortRegister; //Read Port Register
uint8_t _receiveBitMask;
//delay value for Bit
uint16_t _tx_delay;
//delay value for Receive
uint16_t _rx_delay_stopbit;
uint16_t _rx_delay_centering;
uint16_t _rx_delay_intrabit;
//Customize for uBITX Protocol
int8_t receiveIndex = 0;
int8_t receivedCommandLength = 0;
int8_t ffCount = 0;
//Values for Receive Buffer
//uint16_t _buffer_overflow;
//static volatile uint8_t _receive_buffer_head;
//static volatile uint8_t _receive_buffer_tail;
//Values for Interrupt (check Start Bit)
volatile uint8_t *_pcint_maskreg;
uint8_t _pcint_maskvalue;
//================================================================
//Internal Function from SoftwareSerial.c
//================================================================
uint16_t subtract_cap(uint16_t num, uint16_t sub)
{
if (num > sub)
return num - sub;
else
return 1;
}
inline void tunedDelay(uint16_t delay)
{
_delay_loop_2(delay);
}
void setRxIntMsk(bool enable)
{
if (enable)
*_pcint_maskreg |= _pcint_maskvalue;
else
*_pcint_maskreg &= ~_pcint_maskvalue;
}
uint8_t rx_pin_read()
{
return *_receivePortRegister & _receiveBitMask;
}
//
// The receive routine called by the interrupt handler
//
void softSerail_Recv()
{
#if GCC_VERSION < 40302
// Work-around for avr-gcc 4.3.0 OSX version bug
// Preserve the registers that the compiler misses
// (courtesy of Arduino forum user *etracer*)
asm volatile(
"push r18 \n\t"
"push r19 \n\t"
"push r20 \n\t"
"push r21 \n\t"
"push r22 \n\t"
"push r23 \n\t"
"push r26 \n\t"
"push r27 \n\t"
::);
#endif
uint8_t d = 0;
// If RX line is high, then we don't see any start bit
// so interrupt is probably not for us
if (!rx_pin_read()) //Start Bit
{
// Disable further interrupts during reception, this prevents
// triggering another interrupt directly after we return, which can
// cause problems at higher baudrates.
setRxIntMsk(false);
// Wait approximately 1/2 of a bit width to "center" the sample
tunedDelay(_rx_delay_centering);
// Read each of the 8 bits
for (uint8_t i=8; i > 0; --i)
{
tunedDelay(_rx_delay_intrabit);
d >>= 1;
if (rx_pin_read())
d |= 0x80;
}
if (receivedCommandLength == 0) //check Already Command
{
//Set Received Data
swr_receive_buffer[receiveIndex++] = d;
//Finded Command
if (d == 0x73 && ffCount > 1 && receiveIndex > 6)
{
receivedCommandLength = receiveIndex;
receiveIndex = 0;
ffCount = 0;
}
else if (receiveIndex > _SS_MAX_RX_BUFF)
{
//Buffer Overflow
receiveIndex = 0;
ffCount = 0;
}
else if (d == 0xFF)
{
ffCount++;
}
else
{
ffCount = 0;
}
}
// skip the stop bit
tunedDelay(_rx_delay_stopbit);
// Re-enable interrupts when we're sure to be inside the stop bit
setRxIntMsk(true);
}
#if GCC_VERSION < 40302
// Work-around for avr-gcc 4.3.0 OSX version bug
// Restore the registers that the compiler misses
asm volatile(
"pop r27 \n\t"
"pop r26 \n\t"
"pop r23 \n\t"
"pop r22 \n\t"
"pop r21 \n\t"
"pop r20 \n\t"
"pop r19 \n\t"
"pop r18 \n\t"
::);
#endif
}
ISR(PCINT0_vect)
{
softSerail_Recv();
}
//================================================================
//Public Function from SoftwareSerial.c and modified and create
//================================================================
// Read data from buffer
void SWSerial_Read(uint8_t * receive_cmdBuffer)
{
for (int i = 0; i < receivedCommandLength; i++)
receive_cmdBuffer[i] = swr_receive_buffer[i];
}
void SWSerial_Write(uint8_t b)
{
volatile uint8_t *reg = _transmitPortRegister;
uint8_t oldSREG = SREG;
uint16_t delay = _tx_delay;
cli(); // turn off interrupts for a clean txmit
// Write the start bit
*reg &= transmit_InvMask;
tunedDelay(delay);
// Write each of the 8 bits
for (uint8_t i = 8; i > 0; --i)
{
if (b & 1) // choose bit
*reg |= transmit_RegMask; // send 1
else
*reg &= transmit_InvMask; // send 0
tunedDelay(delay);
b >>= 1;
}
// restore pin to natural state
*reg |= transmit_RegMask;
SREG = oldSREG; // turn interrupts back on
tunedDelay(_tx_delay);
}
void SWSerial_Print(uint8_t *b)
{
for (int i = 0; i < PRINT_MAX_LENGTH; i++)
{
if (b[i] == 0x00)
break;
else
SWSerial_Write(b[i]);
}
}
void SWSerial_Begin(long speedBaud)
{
//INT TX_PIN
digitalWrite(TX_PIN, HIGH);
pinMode(TX_PIN, OUTPUT);
transmit_RegMask = digitalPinToBitMask(TX_PIN); //use Bit 1
transmit_InvMask = ~digitalPinToBitMask(TX_PIN); //use Bit 0
_transmitPortRegister = portOutputRegister(digitalPinToPort(TX_PIN));
//INIT RX_PIN
pinMode(RX_PIN, INPUT);
digitalWrite(RX_PIN, HIGH); // pullup for normal logic!
_receiveBitMask = digitalPinToBitMask(RX_PIN);
_receivePortRegister = portInputRegister(digitalPinToPort(RX_PIN));
//Set Values
uint16_t bit_delay = (F_CPU / speedBaud) / 4;
_tx_delay = subtract_cap(bit_delay, 15 / 4);
if (digitalPinToPCICR(RX_PIN))
{
_rx_delay_centering = subtract_cap(bit_delay / 2, (4 + 4 + 75 + 17 - 23) / 4);
_rx_delay_intrabit = subtract_cap(bit_delay, 23 / 4);
_rx_delay_stopbit = subtract_cap(bit_delay * 3 / 4, (37 + 11) / 4);
*digitalPinToPCICR(RX_PIN) |= _BV(digitalPinToPCICRbit(RX_PIN));
_pcint_maskreg = digitalPinToPCMSK(RX_PIN);
_pcint_maskvalue = _BV(digitalPinToPCMSKbit(RX_PIN));
tunedDelay(_tx_delay); // if we were low this establishes the end
}
//Start Listen
setRxIntMsk(true);
}
#else
void SWSerial_Write(uint8_t b)
{
Serial.write(b);
//Serial.flush();
}
void SWSerial_Print(uint8_t *b)
{
for (int i = 0; i < PRINT_MAX_LENGTH; i++)
{
if (b[i] == 0x00)
break;
else
SWSerial_Write(b[i]);
}
}
#endif