Hello
I need help to change the pwm frequency of pin 11, but no solution worked for me. I am looking to make it 4 Khz or (whatever number).
#include <AVR_PWM.h>
#include <stdio.h>
#include <stdlib.h>
#include <CarPWMMotorControl.hpp>
int i=0;
int j=0;
int k=0;
int x=0;
int y=0;
int z=0;
int OK=0;
int OK1=0;
int OK2=0;
int OK3=0;
int OK4=0;
float h=0.0;
int duty_cycle,pwm1,read_ADC ;
double duty;
static int vfbValue;
static int vfbValue1;
int sinPWM[]={1,2,5,7,10,12,15,17,19,22,24,27,30,32,34,37,39,42,44,47,49,52,54,57,59,61,64,66,69,71,73,76,78,80,83,85,88,90,92,94,97,99,
101,103,106,108,110,113,115,117,119,121,124,126,128,130,132,134,136,138,140,142,144,146,148,150,152,154,156,158,160,162,164,166,168,169,
171,173,175,177,178,180,182,184,185,187,188,190,192,193,195,196,198,199,201,202,204,205,207,208,209,211,212,213,215,216,217,219,220,221,
222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,237,238,239,240,240,241,242,242,243,243,244,244,245,245,246,246,
247,247,247,248,248,248,248,249,249,249,249,249,255,255,255,255,249,249,249,249,249,248,248,248,248,247,247,247,246,246,245,245,
244,244,243,243,242,242,241,240,240,239,238,237,237,236,235,234,233,232,231,230,229,228,227,226,225,224,223,222,221,220,219,217,216,
215,213,212,211,209,208,207,205,204,202,201,199,198,196,195,193,192,190,188,187,185,184,182,180,178,177,175,173,171,169,168,166,164,162,160,
158,156,154,152,150,148,146,144,142,140,138,136,134,132,130,128,126,124,121,119,117,115,113,110,108,106,103,101,99,97,94,92,90,88,85,83,80,78,76,
73,71,69,66,64,61,59,57,54,52,49,47,44,42,39,37,34,32,30,27,24,22,19,17,15,12,10,7,5,2,1};
int ledPin = 11;
int potPin = A0;
int potIn; // variable to store the value coming from the potentiometer
int brightness; // variable to hold the pwm value
// int32_t frequency = 5000; //frequenza in Hz
void setup()
{
// int32_t frequency = 5000; //frequenza in Hz
//sets the frequency for the specified pin
pinMode(ledPin, OUTPUT);
pinMode(potPin, INPUT);
Serial.begin(9600);
pinMode(4, OUTPUT); //Pwm T0B pin
pinMode(13,OUTPUT); //Pwm T0A pin
pinMode(9,OUTPUT); //Pwm T2B pin
pinMode(10,OUTPUT); //Pwm T2A pin
pinMode(2,OUTPUT); //Pwm T3B pin
pinMode(3,OUTPUT); //Pwm T3C pin
pinMode(5,OUTPUT); //Pwm T3A pin
pinMode(6,OUTPUT); //Pwm T4A pin
pinMode(7,OUTPUT); //Pwm T4B pin
cli();// stop interrupts
/*****************TIMER0************/
TCCR0A=0;//reset the value
TCCR0B=0;//reset the value
TCNT0=0;//reset the value
//0b allow me to write bits in binary
TCCR0A=0b10100001;//phase correct pwm mode
TCCR0B=0b00000001; //no prescaler
/*****************TIMER2************/
TCCR2A=0; //reset the value
TCCR2B=0; //reset the value
TCNT2=0; //reset the value
//0b allow me to write bits in binary
TCCR2A=0b10100001;//phase correct pwm mode
TCCR2B=0b00000001; //no prescaler
/*****************TIMER3************/
TCCR3A=0; //reset the value
TCCR3B=0; //reset the value
TCNT3=0; //reset the value
//0b allow me to write bits in binary
TCCR3A=0b10100001; //phase correct pwm mode
TCCR3B=0b00000001; //no prescaler
/*****************TIMER4************/
TCCR4B = TCCR4B & B11111000 | B00000010;
TCCR1B = TCCR1B & B11111000 | B00000010; // for PWM frequency of 3921.16 Hz
OCR1A=509; // compare match value
TCCR1B=0b00001001; //WGM12 bit is 1 for CTC mode and no prescaler
/*****************TIMER1 INTERRUPT SETTING************/
TIMSK1 |=(1 << OCIE1A); // enable interrupts
sei(); //enable interrupts
}
/**********************************isr***********************************************/
ISR(TIMER1_COMPA_vect){// interrupt when timer 1 match with OCR1A value
if(i>313 && OK==0){ // final value from vector for pin 13
i=0; // go to first value of vector
OK=1; //enable pin 4
}
if(i>313 && OK==1){ // final value from vector for pin 4
i=0; //go to firs value of vector
OK=0; //enable pin 13
}
x=sinPWM[i]; // x take the value from vector corresponding to position i(i is zero indexed)
i=i+1; // go to the next position
if(OK==0){
OCR0B=0; //make pin 4 0
OCR0A=x; //enable pin 13 to corresponding duty cycle
}
if(OK==1){
OCR0A=0; //make pin 13 0
OCR0B=x; //enable pin 4 to corresponding duty cycle
}
if ((i==209) || OK1==1){ //if i equal with 209 enable second signal
OK1=1; //mantain if function
if(j>313 && OK2==0){// final value from vector for pin 10
j=0; // go to first value of vector
OK2=1; //enable pin 9
}
if(j>313 && OK2==1){// final value from vector for pin 9
j=0; //go to firs value of vector
OK2=0; //enable pin 10
}
y= sinPWM[j]; // y take the value from vector corresponding to position j(j is zero indexed)
j=j+1; // go to the next position
if(OK2==0){
OCR2B=0; //make pin 9 0
OCR2A=y; //enable pin 10 to corresponding duty cycle
}
if(OK2==1){
OCR2A=0; //make pin 10 0
OCR2B=y; //enable pin 9 to corresponding duty cycle
}
}
if ((j==209) || OK3==1){//if j equal with 209 enable third signal
OK3=1; //mantain if function
if(k>313 && OK4==0){// final value from vector for pin 5
k=0; // go to first value of vector
OK4=1; //enable pin 2
}
if(k>313 && OK4==1){// final value from vector for pin 2
k=0; //go to firs value of vector
OK4=0; //enable pin 5
}
z= sinPWM[k];// z take the value from vector corresponding to position k(k is zero indexed)
k=k+1; // go to the next position
if(OK4==0){
OCR3B=0; //make pin 2 0
OCR3A=z; //enable pin 5 to corresponding duty cycle
}
if(OK4==1){
OCR3A=0; //make pin 5 0
OCR3B=z; //enable pin 2 to corresponding duty cycle
}
}
// pinMode(11,155);
// TCCR1B = TCCR1B & B11111000 | B00000010;
// int32_t frequency = 5000; //frequenza in Hz
// setPwmFrequency(11, 8);
// uint32_t pwm_freq2 = 5000;
}
void loop()
{
potIn = analogRead(potPin);
//mapping the Values between 0 to 255
brightness = map(potIn, 0, 1023, 0, 255);
analogWrite(ledPin, brightness);
delayMicroseconds(2);
}
float map1(float x,float in_min,float in_max,float out_min,float out_max){
return float(x-in_min) * (out_max - out_min) /(in_max-in_min)+out_min;
}