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VnArduino.ino
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VnArduino.ino
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/* Vna
Anthony LE CREN F4GOH@orange.fr
Created 03/03/2015
Ce programme dialogue avec le logiciel Jnva et blue vna app android
Possiblilité de fonctionnement en standalone
Hardware : dds ad9851 + ad8302
http://ra4nal.lanstek.ru/vna.shtml
Dans le Jnva, menu Calibration frequency
remplacer 10737418
par
23860477
afin de calculer un DS_FTW correct
dialogue Jna avec la carte
http://wiki.oz9aec.net/index.php/MiniVNA_ICD
protocole de transfert:
MODE $0D DDS_FTW $0D SAMPLES $0D DDS_STEP $0D
Mode StartF NumberF StepF
exemples :
acquisition :
30 0D 32 33 38 36 30 34 38 0D 31 30 30 0D 34 32 0.2386048.100.42
39 32 34 39 39 38 0D 924998
stop
30 0D 30 0D 31 0D 30 0D 0.0.1.0.
générator
30 0D 32 33 38 36 30 34 37 37 30 0D 31 0D 30 0D 0.238604770.1.0.
30 0D 32 33 38 36 30 34 37 37 0D 36 32 38 0D 33 0.23860477.628.3
37 39 38 36 0D 7986
manque dans le code :
detection deconnection bluevna
faire alors un reset de l'arduino
la gestion d'une carte sd
ad9851 informations :
DDS_CLCK = 180Mhz (30Mhz*6)
DS_FTW = F_start * 2^32 / DDS_CLCK
F_start = DS_FTW * DDS_CLCK / 2^32
DDS_STEP = F_step * 2^32 / DDS_CLCK
deltaphase = f * 4294967296.0 / calibFreq;
exemple : retrouver la fréquence a partir de DS_FTW
74082466 * 180000000 / 4294967296.0 = 3104760,28 HZ
*/
#include <avr/pgmspace.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <AD9850SPI.h>
#include <SPI.h>
#include <EEPROM.h>
#define MinFrq 23860900 // FTW min freq = 1 Mhz
#define MaxFrq 1431655765 // FTW max freq = 60 Mhz
#define freqMin 1000000
#define freqMax 60000000
#define PowerDown 0x04 // Power down AD9851,50
#define Normal 0x01 // AD9851 RFCLK multiplier enable x 6 en mode normal
unsigned char Mode; //mode powerdown ou normal
unsigned long StartF; //DS_FTW fréquence de départ
unsigned int NumberF; //nombre d'échantillons
unsigned long StepF; //Fréquence d'incrémentation en FTW (non en HZ)
//char Temp;
unsigned int intTemp; //variable de boucle pour le balayage
unsigned int adcmag; //variables des 2 ADC mesures
unsigned int adcphs;
boolean check=0;
#define led 6 //Affectation des broches
#define Rele 5 //relais refexion, transmission
#define ADC0 A0 //entrée mag
#define ADC1 A1 //entrée phs
#define dpInEncoderA 2
#define dpInEncoderB 3
#define dpInEncoderPress 4
#define adc2Db 60/1024 // pente pleine echelle Db / resolution ADC = 0.0586
#define offsetDb -30 // décallage de -30db, pour ADC=512 -> 0db
#define Adc2Angle 180/1024 // pente pleine echelle Angle / resolution ADC = 0.175
#define D2R 3.14159/180 //degrés to radians
//#define calMag 0.703125 //before calibrate function
//#define calPhs 1.58203125
float calMag;
float calPhs;
struct vector_reflection{
double Freq;
float RL;
float Phi;
float Rho;
float Rs;
float Xs;
float Swr;
float Z;
};
vector_reflection Point;
struct vector_transmission{
double Freq;
float TL;
float TP;
};
volatile long freq = 5000000;
byte vnaMode=0;
volatile byte menuSwapp=0;
byte menuChoose=0;
byte bandChoose;
volatile byte bandSwapp=0;
volatile byte bandSwappPrec=11;
double dds_reg;
long freq_prec = 0;
long freqStep = 0;
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); //4 lines *20 columns lcd char
void(* resetFunc) (void) = 0; //declare reset function @ address 0
int freeRam ()
{
extern int __heap_start, *__brkval;
int v;
return (int) &v - (__brkval == 0 ? (int) &__heap_start : (int) __brkval);
}
void setup(){
lcd.begin(4, 20); //4 lines *20 columns lcd char
lcd.setBacklight(HIGH);
Serial.begin(115200);
pinMode(led, OUTPUT);
pinMode(Rele, OUTPUT);
DDS.begin(13,8,7); // dans l'ordre broches W_CLK, FQ_UD et RESET
//DDS.calibrate(180000000); //pas utile dans l'immédiat mais on ne sait jamais
analogReference(EXTERNAL); //tension de référence extérieure 1.8V de l'ad8302
//A véfifier si utile
dds_reg=((double)freq) * 4294967296.0 / 180000000.0;
DDS.vna(dds_reg,Normal);
delay(1);
DDS.vna(dds_reg,PowerDown);
pinMode(dpInEncoderA, INPUT);
digitalWrite(dpInEncoderA, HIGH);
pinMode(dpInEncoderB, INPUT);
digitalWrite(dpInEncoderB, HIGH);
pinMode(dpInEncoderPress, INPUT);
digitalWrite(dpInEncoderPress, HIGH);
adcmag=EEPROM.read(2)*256+EEPROM.read(1);
adcphs=EEPROM.read(4)*256+EEPROM.read(3);
calMag=((float)adcmag*adc2Db)+offsetDb;
calPhs=((float)adcphs*Adc2Angle);
//Serial.println(calMag); //verif calibration
//Serial.println(calPhs);
lcd.clear();
lcd.print(F(" VNA v1.0")); //intro
lcd.setCursor(0, 2);
lcd.print(F(" F4GOH 2015"));
delay(4000);
lcd.clear();
attachInterrupt(0, doEncoder, CHANGE); // encoder pin on interrupt 0 - pin 2
boot_menu();
menuChoose=EEPROM.read(0);
switch(menuChoose)
{
case 0 : menuJvna(0); break; //pc
case 1 : menuJvna(1); check=0; break; //bluetooth
case 2 : bandSelect(); break; //standalone
}
}
//main loop
void loop(){
switch(menuChoose)
{
case 0 : Jnva(); break; //jvna
case 1 : Jnva(); break; //bluetooth
case 2 : sweep(); break; //standalone
}
}
/********************************************************
* Jvna
********************************************************/
void Jnva()
{
char Temp;
Serial.flush();
Temp = DecodeCom(); //acuisition et décodage d'une demande de mesure en provenance du logiciel IG_miniVNA
if (menuChoose==1) {
StartF=(StartF/9)*20;
StepF=(StepF/9)*20;
}
affiche_freqs(); //pour debug
if ((Temp==0) && (NumberF!=0)) // si le décodage est bon et que le nombre d'échantillons n'est pas nul alors mesure
{
digitalWrite(led, HIGH); //vérification visuelle de la mesure
if (Mode == 0) digitalWrite(Rele, LOW); // commande relais tansmission 0 ou refection 1
else digitalWrite(Rele, HIGH);
for (intTemp=0; intTemp < NumberF; intTemp++) //boucle des mesures
{
if ((StartF >= MinFrq) && (StartF <= MaxFrq)) {
Mode = Normal; // pour faire une mesure F > 0,5 mhz
}
else {
Mode = PowerDown; // F < 0,5 mhz, sinon Power Down ajouter test si F>fmax alors power down
}
DDS.vna(StartF,Mode); //fonction dédiée au vna pour le dds 9851 meme si la lib est 9850
// si le 9850 est utilisé, Normal doit etre à 0
//delay(1);
magPhsADC();
Serial.write((byte)adcphs); // LSB
Serial.write((byte)(adcphs>>8)); // MSB
Serial.write((byte)adcmag); // LSB
Serial.write((byte)(adcmag>>8)); // MSB
StartF = StartF+StepF;
}
}
digitalWrite(led, LOW); //fin de mesure
}
void magPhsADC() //average 20 ech
{
unsigned int amp;
unsigned int phs;
amp=0;
phs=0;
for (int n=0;n<20;n++){
amp = amp + analogRead(ADC0); //mesure 10 bits
phs = phs + analogRead(ADC1);
}
adcmag=amp/20;
adcphs=phs/20;
}
// a virer plus tard
void debug_serial(void)
{
Serial.print(F("Mode :"));
Serial.println(Mode);
Serial.print(F("Start F :"));
Serial.println(StartF);
Serial.print(F("Number F :"));
Serial.println(NumberF);
Serial.print(F("StepF :"));
Serial.println(StepF);
}
// traitement chaine série
char DecodeCom (void)
{
char data, i, err=0, Param[11];
data = getRX(); // récupère un caractère réflextion , transmission
switch (data)
{
case '0': Mode = 0; break;
case '1': Mode = 1; break;
default: err = 1;
}
data = getRX(); // ok c'est un retour chariot
if (data !=0x0D) err = 1;
if (err != 0) return (err); // ou erreur
for (i = 0; i <= 10; i++) // lire l'info sur le mot DS_FTW de start
{
data = getRX();
if (data == 0x0D) break; // sort de la boucle si retour chariot
if (isdigit(data) ==1) Param[i] = data; // vérification si c'est un un chiffre
else err = 1; // sinon erreur
}
if ((i==0) | (i>10)) err = 1; // erreur si DS_FTW start nul ou trop long
Param[i] = 0; // char nul avant conversion
if (err != 0) return (err); // return si erreur
StartF = atol (Param); // conversion en unsigned long
for (i = 0; i <= 5; i++) // meme principe avec le nombre d'échantillons
{
data = getRX();
if (data == 0x0D) break;
if (isdigit(data) ==1) Param[i] = data;
else err = 1;
}
if ((i==0) | (i>5)) err = 1;
Param[i] = 0;
if (err != 0) return (err);
NumberF = atoi (Param);
for (i = 0; i <= 10; i++) // meme principe avec le DS_FTW step
{
data = getRX();
if (data == 0x0D) break;
if (isdigit(data) ==1) Param[i] = data;
else err = 1;
}
if ((i==0) || (i>10)) err = 1;
Param[i] = 0;
if (err != 0) return (err);
StepF = atol (Param);
return (0);
}
/*
mode bluetooth 115200 bauds
<\r><\n>CONNECT,BCCFCC36B9BC<\r> <\n>0<\r>0<\r>1<\r>0<\r>
0<\r>1073804<\r>1000<\r>1931773<\r>
<\r><\n>DISCONNECT<\r><\n>
*/
char getRX(void)
{
char data=0;
do
{
if (Serial.available()) {
data=Serial.read();
if(check==0) {
if (data==0x0D) {
data=0;
while (data!=0x0d)
{
if (Serial.available()) data=Serial.read();
}
while (data!='0')
{
if (Serial.available()) data=Serial.read();
}
}
}
check=1;
}
}
while((data != 0x0D)&&(isdigit(data) !=1));
return data;
}
void affiche_freqs(void)
{
if ((StartF>=MinFrq) && (StartF<=MaxFrq)) {
delete_char(1,8,19);
lcd.setCursor(8,1);
lcd.print((unsigned long)ticksToFreq(StartF));
lcd.print(" Hz");
delete_char(2,8,19);
lcd.setCursor(8,2);
lcd.print((unsigned long)ticksToFreq(StepF));
lcd.print(" Hz");
delete_char(3,8,19);
lcd.setCursor(8,3);
lcd.print(NumberF);
}
}
double ticksToFreq(long f)
{
return ((double)f) * 180000000.0 / 4294967296.0;
}
void menuJvna(byte PB)
{
lcd.clear();
if (PB==0) lcd.print(F("JVna PC")); else lcd.print(F("Blue Vna Android"));
lcd.setCursor(0, 1);
lcd.print(F("Fstart:"));
lcd.setCursor(0, 2);
lcd.print(F("Fstep:"));
lcd.setCursor(0, 3);
lcd.print(F("Samples:"));
}
/********************************************************
* Bluetooth
********************************************************/
// géré dans le JvnaPC
/********************************************************
* StandAlone
********************************************************/
void sweep()
{
char tab[10];
int freqLcd;
byte bpState=0;
if (freq!=freq_prec){
double dds_reg=((double)freq) * 4294967296.0 / 180000000.0;
DDS.vna(dds_reg,Normal);
freq_prec=freq;
BCD(freq,tab);
lcd.setCursor(5, 0);
lcd.write(tab[7]);
lcd.write(tab[6]);
lcd.write(46);
lcd.write(tab[5]);
lcd.write(tab[4]);
mesure();
}
if (digitalRead(dpInEncoderPress)==0) bpState|=1;
if (bpState==1) bandSelect();
bpState=(bpState<<1)&3;
}
void BCD (unsigned long b, char* o)
{
for (int i=10; i; --i)
{
*o = (b % 10)+48;
b /= 10;
o++;
}
}
void mesure()
{
magPhsADC();
calculDut(adcmag,adcphs);
vna_print();
delete_char(1,3,9);
lcd.setCursor(3, 1);
lcd.print((int)Point.RL);
lcd.print(F("dB"));
delete_char(2,4,9);
lcd.setCursor(4, 2);
lcd.print((int)Point.Phi);
lcd.write(0xdf);
delete_char(1,13,19);
lcd.setCursor(13, 1);
lcd.print((int)Point.Rs);
lcd.write(0xf4);
delete_char(2,13,19);
lcd.setCursor(13, 2);
lcd.print((int)Point.Xs);
lcd.write(0xf4);
delete_char(3,2,9);
lcd.setCursor(2, 3);
lcd.print((int)Point.Z);
lcd.write(0xf4);
delete_char(3,14,19);
lcd.setCursor(14, 3);
if (Point.Swr>=1)
{
lcd.print((int)Point.Swr);
lcd.write(46);
byte tempSwr=(int)((Point.Swr-(int)(Point.Swr))*100);
if (tempSwr/10==0) lcd.write(48);
lcd.print(tempSwr);
}
}
void delete_char(byte line, byte start, byte end)
{
while(start<=end) {
lcd.setCursor(start, line);
lcd.write(32);
start++;
}
}
/********************************************************
* Compute Vna datas
********************************************************/
/*
//formulas
RL=-20log(Rho)
Rho=10^(Rl/-20)
Z=(ZL-ZO)/(ZL+Z0) avec Z0=50ohms
Z=a+jb avec
a=Rho*cos(phi)
b=Rho*sin(phi)
ZL=(1+Z)/(1-Z)*Z0
ZL=RS+jXS avec
RS=abs(1-a²-b²)/((1-a)²+b²)
XS=abs(2b/((1-a)²-b²))
|Z|=sqrt(RS²+XS²)
SWR=(1+Rho)/(1-Rho)
*/
void calculDut(int adcMag, int adcPhs)
{
Point.Freq=freq;
Point.RL=((float)adcMag*adc2Db)+offsetDb-calMag;
Point.Phi=((float)adcPhs*Adc2Angle)-calPhs;
Point.Rho=pow(10.0,Point.RL/-20.0);
float re=Point.Rho*cos(Point.Phi * D2R);
float im=Point.Rho*sin(Point.Phi * D2R);
float denominator=((1-re)*(1-re)+(im*im));
Point.Rs=fabs((1-(re*re)-(im*im))/denominator)*50.0;
Point.Xs=fabs(2.0*im)/denominator*50.0;
Point.Z=sqrt(Point.Rs*Point.Rs+Point.Xs*Point.Xs);
Point.Swr=fabs(1.0+Point.Rho)/(1.001-Point.Rho);
Point.RL*=-1;
}
void vna_print()
{
Serial.print(freq);
Serial.write(9);
Serial.print(adcmag);
Serial.write(9);
Serial.print(adcphs);
Serial.write(9);
Serial.print(Point.RL);
Serial.write(9);
Serial.print(Point.Phi);
Serial.write(9);
Serial.print(Point.Rho);
Serial.write(9);
Serial.print(Point.Rs);
Serial.write(9);
Serial.print(Point.Xs);
Serial.write(9);
Serial.print(Point.Z);
Serial.write(9);
Serial.println(Point.Swr);
}
/********************************************************
* Encoder
********************************************************/
void doEncoder() {
if (digitalRead(dpInEncoderA) == digitalRead(dpInEncoderB)) {
menuSwapp=(menuSwapp+1)%4;
bandSwappPrec=bandSwapp;
bandSwapp=(bandSwapp+1)%12;
freq+=freqStep;
if (freq>freqMax) freq=freqMax;
} else {
freq-=freqStep;
if (freq<freqMin) freq=freqMin;
}
}
/********************************************************
* Lcd menus
********************************************************/
void lcd_menu_analyse_refection()
{
lcd.clear();
lcd.print(F("FREQ:"));
lcd.setCursor(11, 0);
lcd.print(F("MHz"));
lcd.setCursor(0, 1);
lcd.print(F("RL:"));
lcd.setCursor(10, 1);
lcd.print(F("RS:"));
lcd.setCursor(0, 2);
lcd.print(F("Phi:"));
lcd.setCursor(10, 2);
lcd.print(F("XS:"));
lcd.setCursor(0, 3);
lcd.print(F("Z:"));
lcd.setCursor(10, 3);
lcd.print(F("SWR:"));
}
void boot_menu()
{
if (digitalRead(dpInEncoderPress)==1) return;
lcd.clear();
lcd.setCursor(1, 0);
lcd.print(F("JVna PC"));
lcd.setCursor(1, 1);
lcd.print(F("Blue Vna Android"));
lcd.setCursor(1, 2);
lcd.print(F("Standalone Reflect."));
lcd.setCursor(1, 3);
lcd.print(F("Calibration V1.0"));
while(digitalRead(dpInEncoderPress)==0) {} //BP rise down detect
while(digitalRead(dpInEncoderPress)==1) {
for (byte n=0;n<=3;n++) {
lcd.setCursor(0, n);
if (menuSwapp==n) lcd.write(42); else lcd.write(32);
}
}
menuChoose=menuSwapp;
for (byte n=0;n<=3;n++) {
if (menuChoose!=n) {
for (byte m=0;m<20;m++) {
lcd.setCursor(m, n);
lcd.write(32);
}
}
}
delay(1000);
if (menuChoose<3) EEPROM.write(0,menuChoose); else calibration();
resetFunc(); //call reset
}
void bandSelect()
{
lcd.clear();
lcd.setCursor(1, 0);
lcd.print(F("160m 80m 60m"));
lcd.setCursor(1, 1);
lcd.print(F(" 40m 30m 20m"));
lcd.setCursor(1, 2);
lcd.print(F(" 17m 15m 12m"));
lcd.setCursor(1, 3);
lcd.print(F(" 10m 6m Free"));
delay(100); //pour le bp
while(digitalRead(dpInEncoderPress)==0) {} //BP rise down detect
while(digitalRead(dpInEncoderPress)==1) {
byte x,y;
x=(bandSwappPrec%3)*6;
y=(bandSwappPrec/3);
lcd.setCursor(x, y);
lcd.write(32);
x=(bandSwapp%3)*6;
y=(bandSwapp/3);
lcd.setCursor(x, y);
lcd.write(42);
}
delay(100); //pour le bp
bandChoose=bandSwapp;
switch (bandChoose)
{
case 0 : freq = 1800000; break;
case 1 : freq = 3500000; break;
case 2 : freq = 5300000; break;
case 3 : freq = 7000000; break;
case 4 : freq = 10100000; break;
case 5 : freq = 14000000; break;
case 6 : freq = 18100000; break;
case 7 : freq = 21000000; break;
case 8 : freq = 24900000; break;
case 9 : freq = 28000000; break;
case 10 : freq =50000000; break;
default : freq =14000000;
}
if (bandChoose<11) freqStep=10000; else freqStep=100000;
lcd_menu_analyse_refection();
freq_prec=0;
vna_print_unites();
}
void vna_print_unites()
{
Serial.println(F("Freq\tAdcmag\tAdcphs\tRL\tPhiMag\tRS\tXs\tZ\tSWR"));
}
/********************************************************
* Calibration
* one point calibration only
********************************************************/
void calibration()
{
lcd.clear();
lcd.print(F("Leave open DUT"));
lcd.setCursor(0, 1);
lcd.print(F("and press button"));
while(digitalRead(dpInEncoderPress)==0) {} //BP rise down detect
while(digitalRead(dpInEncoderPress)==1) {}
DDS.vna(dds_reg,Normal);
delay(10);
lcd.clear();
mesure();
DDS.vna(dds_reg,PowerDown);
EEPROM.write(1,(byte) adcmag);
EEPROM.write(2,(byte) (adcmag>>8));
EEPROM.write(3,(byte) adcphs);
EEPROM.write(4,(byte) (adcphs>>8));
delay(2000);
lcd.clear();
lcd.print(F("Done"));
lcd.setCursor(0, 1);
lcd.print(F("Press button to"));
lcd.setCursor(0, 2);
lcd.print(F("return normal mode"));
while(digitalRead(dpInEncoderPress)==0) {} //BP rise down detect
while(digitalRead(dpInEncoderPress)==1) {}
delay(2000);
}