PWM using controller

baileychic · Aug 23, 2017

Can you use ATTiny2313 or 4313 ? ATTinly25/10 doesn't have ICPx pin for input capture.

If you still want to use ATTiny25 then Timer0 has to be used to find the duty of the input PWM using INT0pin and then Timer1 has to be used for getting PWM output.

baileychic · Aug 23, 2017

As of now I was able to generate 100 Hz Variable PWM duty PWM in ATTiny25 using Timer1 and CodeVisionAVR. ATTiny25 doesn't have ICPx pin and hence input capture feature is not available. I will use T0/INT0 with Timer0 to find the duty of the input PWM. This will be assigned to output PWM duty.

See attached simulation video.

This is the code.

Code C - [expand]
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/*******************************************************
This program was created by the CodeWizardAVR V3.28 
Automatic Program Generator
© Copyright 1998-2016 Pavel Haiduc, HP InfoTech s.r.l.
[url]http://www.hpinfotech.com[/url]
 
Project : 
Version : 
Date    : 8/23/2017
Author  : 
Company : 
Comments: 
 
 
Chip type               : ATtiny25
AVR Core Clock frequency: 8.000000 MHz
Memory model            : Tiny
External RAM size       : 0
Data Stack size         : 32
*******************************************************/
 
#include <io.h>
#include <delay.h>
 
// Declare your global variables here
int i = 0;
 
void main(void)
{
// Declare your local variables here
 
// Crystal Oscillator division factor: 1
#pragma optsize-
CLKPR=(1<<CLKPCE);
CLKPR=(0<<CLKPCE) | (0<<CLKPS3) | (0<<CLKPS2) | (0<<CLKPS1) | (0<<CLKPS0);
#ifdef _OPTIMIZE_SIZE_
#pragma optsize+
#endif
 
// Input/Output Ports initialization
// Port B initialization
// Function: Bit5=Out Bit4=Out Bit3=Out Bit2=In Bit1=Out Bit0=Out 
DDRB=(1<<DDB5) | (1<<DDB4) | (1<<DDB3) | (0<<DDB2) | (1<<DDB1) | (1<<DDB0);
// State: Bit5=0 Bit4=0 Bit3=0 Bit2=P Bit1=0 Bit0=0 
PORTB=(0<<PORTB5) | (0<<PORTB4) | (0<<PORTB3) | (1<<PORTB2) | (0<<PORTB1) | (0<<PORTB0);
 
// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
// Mode: Fast PWM top=0xFF
// OC0A output: Non-Inverted PWM
// OC0B output: Disconnected
TCCR0A=(1<<COM0A1) | (0<<COM0A0) | (0<<COM0B1) | (0<<COM0B0) | (1<<WGM01) | (1<<WGM00);
TCCR0B=(0<<WGM02) | (0<<CS02) | (0<<CS01) | (0<<CS00);
TCNT0=0x00;
OCR0A=0x00;
OCR0B=0x00;
 
// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: 15.625 kHz
// Mode: PWMA top=OCR1C
// OC1A output: OC1A=PWM, /OC1A=/PWM
// OC1B output: Disconnected
// Timer Period: 9.984 ms
// Output Pulse(s):
// OC1A Period: 9.984 ms Width: 5.0242 ms
// Timer1 Overflow Interrupt: Off
// Compare A Match Interrupt: Off
// Compare B Match Interrupt: Off
PLLCSR=(0<<PCKE) | (0<<PLLE) | (0<<PLOCK);
 
TCCR1=(0<<CTC1) | (1<<PWM1A) | (0<<COM1A1) | (1<<COM1A0) | (1<<CS13) | (0<<CS12) | (1<<CS11) | (0<<CS10);
GTCCR=(0<<TSM) | (0<<PWM1B) | (0<<COM1B1) | (0<<COM1B0) | (0<<PSR1) | (0<<PSR0);
TCNT1=0x00;
OCR1A=0x4E;
OCR1B=0x00;
OCR1C=0x9B;
 
// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=(0<<OCIE1A) | (0<<OCIE1B) | (0<<OCIE0A) | (0<<OCIE0B) | (0<<TOIE1) | (0<<TOIE0);
 
// External Interrupt(s) initialization
// INT0: Off
// Interrupt on any change on pins PCINT0-5: Off
GIMSK=(0<<INT0) | (0<<PCIE);
MCUCR=(0<<ISC01) | (0<<ISC00);
 
// USI initialization
// Mode: Disabled
// Clock source: Register & Counter=no clk.
// USI Counter Overflow Interrupt: Off
USICR=(0<<USISIE) | (0<<USIOIE) | (0<<USIWM1) | (0<<USIWM0) | (0<<USICS1) | (0<<USICS0) | (0<<USICLK) | (0<<USITC);
 
// Analog Comparator initialization
// Analog Comparator: Off
// The Analog Comparator's positive input is
// connected to the AIN0 pin
// The Analog Comparator's negative input is
// connected to the AIN1 pin
ACSR=(1<<ACD) | (0<<ACBG) | (0<<ACO) | (0<<ACI) | (0<<ACIE) | (0<<ACIS1) | (0<<ACIS0);
ADCSRB=(0<<ACME);
// Digital input buffer on AIN0: On
// Digital input buffer on AIN1: On
DIDR0=(0<<AIN0D) | (0<<AIN1D);
 
// ADC initialization
// ADC disabled
ADCSRA=(0<<ADEN) | (0<<ADSC) | (0<<ADATE) | (0<<ADIF) | (0<<ADIE) | (0<<ADPS2) | (0<<ADPS1) | (0<<ADPS0);
 
 
while (1)
      {
      // Place your code here                
         for(i = 0; i < 155; i++) {
            OCR1A = i;
            delay_ms(30);
         }
         
         for(i = 154; i > 0; i--) {
            OCR1A = i;
            delay_ms(30);
         }    
      }
}

RenesasT · Aug 23, 2017

Hello baileychic,

Great.

Let me tell you, if the i/p is analog signal between 0-5V then I am able to convert analog to digital and accordingly I am able to generate PWM of 100Hz.

Also I am able to vary duty according to the analog value.

Now my i/p is PWM signal. How to capture duty? according to captured duty, how to vary the o/p duty.

I am able to generate PWM of 100Hz at o/p but not able to capture the duty at i/p.

I need a code to capture the duty of i/p PWM.

baileychic · Aug 23, 2017

This is an example which I found for using ICP feature.

https://www.electronicwings.com/avr-atmega/atmega1632-timer-input-capture-mode

KlausST · Aug 23, 2017

Hi,

I think the most reliable is from the manufacturer. ATMEL.COM, AVR135

Klaus

baileychic · Aug 23, 2017

I know how to use ICP with interrupts to find PWM duty. I also know how to generate 100 Hz PWM output but problem this ATTiny10 has only one Timer. So, still reading the datasheet to make the code.

KlausST · Aug 23, 2017

Hi,

there is a good chance that one timer can do both.
It depends on software and signal frequencies.

Klaus

baileychic · Aug 24, 2017

In Proteus ATTiny10 model is not working. I tested it with a Blinky example but it doesn't work. So, the code I make have to be tested on hardware.

FvM · Aug 24, 2017

there is a good chance that one timer can do both.
It depends on software and signal frequencies.

It looks like ATtiny10 can be configured to use ICP and OCR simultaneously in timer normal mode. You have to figure out how.

baileychic · Aug 24, 2017

I have figured it out and I have made the code but I am getting 50 Hz output PWM and not 100 Hz. I am trying to fix the code.

baileychic · Aug 31, 2017

I have successfully made the code. Now it is giving 100 Hz PWM with duty according to input signal duty.

RenesasT · Sep 19, 2017

I am using ATtiny10. It has only 6 pins.

It has only one 16 bit timer. Does generation of PWM at o/p and capture of duty of i/p PWM possible by ATtiny10? (as it has only one timer).

baileychic · Sep 20, 2017

I think it is possible because thats what I have done with ATMega8A (using one timer).

RenesasT · Sep 23, 2017

Hello baileychic,

Can you please send me the code. I would like to configure same for ATtiny10 controller.

baileychic · Sep 23, 2017

Here is the code. It doesn't work for 0% duty and 100% duty PWM. It works fine for others on ATMega8A. Tested on hardware.

Code C - [expand]
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/*******************************************************
This program was created by the CodeWizardAVR V3.28 
Automatic Program Generator
© Copyright 1998-2016 Pavel Haiduc, HP InfoTech s.r.l.
[url]http://www.hpinfotech.com[/url]
 
Project : pwm2pwm
Version : 1.0.4
Date    : 8/24/2017
Author  : 
Company : 
Comments: 
 
 
Chip type               : ATmega8
Program type            : Application
AVR Core Clock frequency: 8.000000 MHz
Memory model            : Small
External RAM size       : 0
Data Stack size         : 256
*******************************************************/
 
#include <io.h>
#include <stdio.h>
#include <string.h>
#include <delay.h>
 
// Alphanumeric LCD functions
#include <alcd.h>
 
// Declare your global variables here
#define SET   1
#define CLEAR 0
 
#define _LCD_COLUMN_LENGTH 16
char j = 0;
 
unsigned int current = 0, previous = 0, period = 0, width = 0;
unsigned char duty = 0;
unsigned int high_time = 1000;
unsigned int low_time = 250;
unsigned char state_counter = 0;
unsigned char do_calc = 0;
char txt[23];
 
// Timer1 input capture interrupt service routine
interrupt [TIM1_CAPT] void timer1_capt_isr(void)
{
    // Place your code here
    //if(do_calc == 0) {
        if(state_counter == 0) {
            current = ICR1;
            TCCR1B=(0<<ICNC1) | (0<<ICES1) | (0<<WGM13) | (0<<WGM12) | (0<<CS12) | (1<<CS11) | (1<<CS10);
            period = current - previous;
            previous = current;
            state_counter = 1;    
        }
        else if(state_counter == 1) {
            width = ICR1 - previous;            
            TCCR1B=(0<<ICNC1) | (1<<ICES1) | (0<<WGM13) | (0<<WGM12) | (0<<CS12) | (1<<CS11) | (1<<CS10);
            state_counter = 0;            
            //do_calc = 1;
        }   
    //}
}
 
// Timer1 output compare A interrupt service routine
interrupt [TIM1_COMPA] void timer1_compa_isr(void)
{
// Place your code here
    static unsigned int last_reload;        //record of last value written to OCR1A
    static unsigned char output_mode;       //record of state of OCR1A output mode, 1 = set on compare, 0 = clear on compare
 
    if (output_mode) {
        //OCR mode is 'set on compare' so now set delay to high time and mode to clear on compare
        last_reload = last_reload + high_time;
        OCR1AH = last_reload >> 8;
        OCR1AL = last_reload & 0x00ff;
        TCCR1A=(1<<COM1A1) | (0<<COM1A0) | (0<<COM1B1) | (0<<COM1B0) | (0<<WGM11) | (0<<WGM10);
        output_mode = CLEAR;
 
    }
    else {
        //OCR mode is 'clear on compare' so now set delay to low time and mode to set on compare
        last_reload = last_reload + low_time;
        OCR1AH = last_reload >> 8;
        OCR1AL = last_reload & 0x00ff;
        TCCR1A=(1<<COM1A1) | (1<<COM1A0) | (0<<COM1B1) | (0<<COM1B0) | (0<<WGM11) | (0<<WGM10);
        output_mode = SET;
    }
 
}
 
void main(void)
{
// Declare your local variables here
 
// Input/Output Ports initialization
// Port B initialization
// Function: Bit7=Out Bit6=Out Bit5=Out Bit4=Out Bit3=Out Bit2=Out Bit1=Out Bit0=In 
DDRB=(1<<DDB7) | (1<<DDB6) | (1<<DDB5) | (1<<DDB4) | (1<<DDB3) | (1<<DDB2) | (1<<DDB1) | (0<<DDB0);
// State: Bit7=0 Bit6=0 Bit5=0 Bit4=0 Bit3=0 Bit2=0 Bit1=0 Bit0=P 
PORTB=(0<<PORTB7) | (0<<PORTB6) | (0<<PORTB5) | (0<<PORTB4) | (0<<PORTB3) | (0<<PORTB2) | (0<<PORTB1) | (1<<PORTB0);
 
// Port C initialization
// Function: Bit6=In Bit5=Out Bit4=Out Bit3=Out Bit2=Out Bit1=Out Bit0=Out 
DDRC=(0<<DDC6) | (1<<DDC5) | (1<<DDC4) | (1<<DDC3) | (1<<DDC2) | (1<<DDC1) | (1<<DDC0);
// State: Bit6=P Bit5=0 Bit4=0 Bit3=0 Bit2=0 Bit1=0 Bit0=0 
PORTC=(1<<PORTC6) | (0<<PORTC5) | (0<<PORTC4) | (0<<PORTC3) | (0<<PORTC2) | (0<<PORTC1) | (0<<PORTC0);
 
// Port D initialization
// Function: Bit7=Out Bit6=Out Bit5=Out Bit4=Out Bit3=Out Bit2=Out Bit1=Out Bit0=Out 
DDRD=(1<<DDD7) | (1<<DDD6) | (1<<DDD5) | (1<<DDD4) | (1<<DDD3) | (1<<DDD2) | (1<<DDD1) | (1<<DDD0);
// State: Bit7=0 Bit6=0 Bit5=0 Bit4=0 Bit3=0 Bit2=0 Bit1=0 Bit0=0 
PORTD=(0<<PORTD7) | (0<<PORTD6) | (0<<PORTD5) | (0<<PORTD4) | (0<<PORTD3) | (0<<PORTD2) | (0<<PORTD1) | (0<<PORTD0);
 
// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
TCCR0=(0<<CS02) | (0<<CS01) | (0<<CS00);
TCNT0=0x00;
 
// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: 125.000 kHz
// Mode: Normal top=0xFFFF
// OC1A output: Toggle on compare match
// OC1B output: Disconnected
// Noise Canceler: Off
// Input Capture on Rising Edge
// Timer Period: 0.52429 s
// Output Pulse(s):
// OC1A Period: 1.0486 s Width: 0.52429 s
// Timer1 Overflow Interrupt: Off
// Input Capture Interrupt: On
// Compare A Match Interrupt: On
// Compare B Match Interrupt: Off
TCCR1A=(0<<COM1A1) | (1<<COM1A0) | (0<<COM1B1) | (0<<COM1B0) | (0<<WGM11) | (0<<WGM10);
TCCR1B=(0<<ICNC1) | (1<<ICES1) | (0<<WGM13) | (0<<WGM12) | (0<<CS12) | (1<<CS11) | (1<<CS10);
TCNT1H=0x00;
TCNT1L=0x00;
ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;
 
// Timer/Counter 2 initialization
// Clock source: System Clock
// Clock value: Timer2 Stopped
// Mode: Normal top=0xFF
// OC2 output: Disconnected
ASSR=0<<AS2;
TCCR2=(0<<PWM2) | (0<<COM21) | (0<<COM20) | (0<<CTC2) | (0<<CS22) | (0<<CS21) | (0<<CS20);
TCNT2=0x00;
OCR2=0x00;
 
// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=(0<<OCIE2) | (0<<TOIE2) | (1<<TICIE1) | (1<<OCIE1A) | (0<<OCIE1B) | (0<<TOIE1) | (0<<TOIE0);
 
// External Interrupt(s) initialization
// INT0: Off
// INT1: Off
MCUCR=(0<<ISC11) | (0<<ISC10) | (0<<ISC01) | (0<<ISC00);
 
// USART initialization
// USART disabled
UCSRB=(0<<RXCIE) | (0<<TXCIE) | (0<<UDRIE) | (0<<RXEN) | (0<<TXEN) | (0<<UCSZ2) | (0<<RXB8) | (0<<TXB8);
 
// Analog Comparator initialization
// Analog Comparator: Off
// The Analog Comparator's positive input is
// connected to the AIN0 pin
// The Analog Comparator's negative input is
// connected to the AIN1 pin
ACSR=(1<<ACD) | (0<<ACBG) | (0<<ACO) | (0<<ACI) | (0<<ACIE) | (0<<ACIC) | (0<<ACIS1) | (0<<ACIS0);
SFIOR=(0<<ACME);
 
// ADC initialization
// ADC disabled
ADCSRA=(0<<ADEN) | (0<<ADSC) | (0<<ADFR) | (0<<ADIF) | (0<<ADIE) | (0<<ADPS2) | (0<<ADPS1) | (0<<ADPS0);
 
// SPI initialization
// SPI disabled
SPCR=(0<<SPIE) | (0<<SPE) | (0<<DORD) | (0<<MSTR) | (0<<CPOL) | (0<<CPHA) | (0<<SPR1) | (0<<SPR0);
 
// TWI initialization
// TWI disabled
TWCR=(0<<TWEA) | (0<<TWSTA) | (0<<TWSTO) | (0<<TWEN) | (0<<TWIE);
 
// Alphanumeric LCD initialization
// Connections are specified in the
// Project|Configure|C Compiler|Libraries|Alphanumeric LCD menu:
// RS - PORTC Bit 0
// RD - PORTD Bit 0
// EN - PORTC Bit 1
// D4 - PORTC Bit 2
// D5 - PORTC Bit 3
// D6 - PORTC Bit 4
// D7 - PORTC Bit 5
// Characters/line: 16
lcd_init(16);
lcd_gotoxy(1,0);
lcd_puts("    PWM Duty    ");
 
// Globally enable interrupts
#asm("sei")
 
  while (1)
  {
        // Place your code here        j      
        sprintf((char *)txt, "%3u", duty);        
        strcat(txt, "%");
        j = ((_LCD_COLUMN_LENGTH / 2) - (strlen(txt) / 2));
        strcat(txt, "  ");
        lcd_gotoxy(j,1);
        lcd_puts(txt);
        
        //if(do_calc == 1) {                  
           duty = (unsigned char)((float)(((float)width / (float)period) * 100.0));
       
           high_time = (unsigned int)duty * 10;
           low_time = 1250 - high_time;
                 
           do_calc = 0;             
        //}        
  }
}

RenesasT · Sep 25, 2017

Hello baileychic ,

Thanks for the code. I appreciate your work.

Can you please do one more favor for me. I was trying to implement the same code for ATtiny10, but I got so many errors while doing the same.

Can you please help me with ATtiny 10 code. I don't need LCD and other functioning. I need to generate 100Hz frequency at o/p with duty cycle is equal to the i/p duty cycle using single timer.

Please help me. Only this will get success to my project.

Awaiting for positive reply.

baileychic · Sep 25, 2017

Don't waste your time with ATTiny10. I made ATTiny10 code but it doesn't compile due to insufficient RAM. Better choose a different ATTiny chip.

Code C - [expand]
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/*******************************************************
This program was created by the CodeWizardAVR V3.28 
Automatic Program Generator
© Copyright 1998-2016 Pavel Haiduc, HP InfoTech s.r.l.
[url]http://www.hpinfotech.com[/url]
 
Project : PWM2PWM
Version : 1.0.0
Date    : 9/25/2017
Author  : bailychic
Company : NA
Comments: 
 
 
Chip type               : ATtiny10
AVR Core Clock frequency: 8.000000 MHz
Memory model            : Tiny
External RAM size       : 0
Data Stack size         : 8
*******************************************************/
 
#include <io.h>
 
// Declare your global variables here
#define SET   1
#define CLEAR 0
 
unsigned int current = 0, previous = 0, period = 0, width = 0;
unsigned char duty = 0;
unsigned int high_time = 1000;
unsigned int low_time = 250;
unsigned char state_counter = 0;
unsigned char do_calc = 0;
 
// Timer 0 input capture interrupt service routine
interrupt [TIM0_CAPT] void timer0_capt_isr(void)
{
    // Place your code here
    if(do_calc == 0) {
        if(state_counter == 0) {
            current = ICR0;
            period = current - previous;
            previous = current;
            state_counter = 1;
            TCCR0B=(0<<ICNC0) | (0<<ICES0) | (0<<WGM03) | (0<<WGM02) | (0<<CS02) | (1<<CS01) | (1<<CS00);    
        }
        else if(state_counter == 1) {
            width = ICR0 - previous;            
            TCCR0B=(0<<ICNC0) | (1<<ICES0) | (0<<WGM03) | (0<<WGM02) | (0<<CS02) | (1<<CS01) | (1<<CS00);
            state_counter = 0;
            
            do_calc = 1;
        }   
    }
}
 
// Timer 0 output compare A interrupt service routine
interrupt [TIM0_COMPA] void timer0_compa_isr(void)
{
    // Place your code here
    static unsigned int last_reload;        //record of last value written to OCR1A
    static unsigned char output_mode;       //record of state of OCR1A output mode, 1 = set on compare, 0 = clear on compare
 
    if (output_mode) {
        //OCR mode is 'set on compare' so now set delay to high time and mode to clear on compare
        last_reload = last_reload + high_time;
        OCR0AH = last_reload >> 8;
        OCR0AL = last_reload & 0x00ff;
        TCCR0A=(0<<COM0A1) | (0<<COM0A0) | (0<<COM0B1) | (0<<COM0B0) | (0<<WGM01) | (0<<WGM00);
        output_mode = CLEAR;
 
    }
    else {
        //OCR mode is 'clear on compare' so now set delay to low time and mode to set on compare
        last_reload = last_reload + low_time;
        OCR0AH = last_reload >> 8;
        OCR0AL = last_reload & 0x00ff;
        TCCR0A=(0<<COM0A1) | (1<<COM0A0) | (0<<COM0B1) | (0<<COM0B0) | (0<<WGM01) | (0<<WGM00);
        output_mode = SET;
    }
}
 
void main(void)
{
// Declare your local variables here
 
// Main Clock source: Calibrated Internal 8 MHz Osc.
CCP=0xd8;
CLKMSR=(0<<CLKMS1) | (0<<CLKMS0);
// Clock Prescaler division factor: 1
CCP=0xd8;
CLKPSR=(0<<CLKPS3) | (0<<CLKPS2) | (0<<CLKPS1) | (0<<CLKPS0);
 
// Voltage Level Monitor initialization
// Trigger Level: Voltage Level Monitor Disabled
// Interrupt: Off
VLMCSR=(0<<VLMF) | (0<<VLMIE) | (0<<VLM2) | (0<<VLM1) | (0<<VLM0);
 
// Input/Output Ports initialization
// Port B initialization
// Pull-up initialization:
// Bit3=Off Bit2=Off Bit1=On Bit0=Off 
PUEB=(0<<PUEB3) | (0<<PUEB2) | (1<<PUEB1) | (0<<PUEB0);
// Function: Bit3=Out Bit2=Out Bit1=In Bit0=Out 
DDRB=(1<<DDB3) | (1<<DDB2) | (0<<DDB1) | (1<<DDB0);
// State: Bit3=0 Bit2=0 Bit1=P Bit0=0 
PORTB=(0<<PORTB3) | (0<<PORTB2) | (1<<PORTB1) | (0<<PORTB0);
 
// Break Before Make Mode PORTB: Off
PORTCR=(0<<BBMB);
 
// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: 125.000 kHz
// Mode: Normal top=0xFFFF
// Input Capture on Rising Edge
// Input Capture Noise Canceler: Off
// OC0A output: Toggle on compare match
// OC0B output: Disconnected
// Timer Period: 0.52429 s
// Output Pulse(s):
// OC0A Period: 1.0486 s Width: 0.52429 s
TCCR0A=(0<<COM0A1) | (1<<COM0A0) | (0<<COM0B1) | (0<<COM0B0) | (0<<WGM01) | (0<<WGM00);
TCCR0B=(0<<ICNC0) | (1<<ICES0) | (0<<WGM03) | (0<<WGM02) | (0<<CS02) | (1<<CS01) | (1<<CS00);
TCNT0=0x0000;
ICR0=0x0000;
OCR0A=0x0000;
OCR0B=0x0000;
 
// Timer/Counter 0 Interrupt(s) initialization
TIMSK0=(1<<ICIE0) | (0<<OCIE0B) | (1<<OCIE0A) | (0<<TOIE0);
 
// External Interrupt(s) initialization
// INT0: Off
// Interrupt on any change on pins PCINT0-3: Off
EICRA=(0<<ISC01) | (0<<ISC00);
EIMSK=(0<<INT0);
PCICR=(0<<PCIE0);
 
// Analog Comparator initialization
// Analog Comparator: Off
// The Analog Comparator's positive input is
// connected to the AIN0 pin
// The Analog Comparator's negative input is
// connected to the AIN1 pin
ACSR=(1<<ACD) | (0<<ACO) | (0<<ACI) | (0<<ACIE) | (0<<ACIC) | (0<<ACIS1) | (0<<ACIS0);
// Digital input buffer on AIN0: On
// Digital input buffer on AIN1: On
DIDR0=(0<<ADC0D) | (0<<ADC1D);
 
// ADC initialization
// ADC disabled
ADCSRA=(0<<ADEN) | (0<<ADSC) | (0<<ADATE) | (0<<ADIF) | (0<<ADIE) | (0<<ADPS2) | (0<<ADPS1) | (0<<ADPS0);
 
// Globally enable interrupts
#asm("sei")
 
while (1)
      {
        // Place your code here
        if(do_calc == 1) {                  
           duty = (unsigned char)((float)(((float)width / (float)period) * 100.0));
       
           high_time = (unsigned int)duty * 10;
           low_time = 1250 - high_time;
                 
           do_calc = 0;             
        }
      }
}

RenesasT · Sep 26, 2017

Hello baileychic,

I have implemented the same code you gave for the ATTINY10. I am not getting any issue of code size.

I am getting different errors. Please suggest.

baileychic · Sep 26, 2017

What errors are you getting ?

RenesasT · Sep 26, 2017

Severity Code Description Line

Error recipe for target 'main.o' failed 76

Error 'TIM0_CAPT' undeclared here (not in a function) 25

Error expected '=', ',', ';', 'asm' or '__attribute__' before 'void' 25

Error 'TIM0_COMPA' undeclared here (not in a function) 47

Error expected '=', ',', ';', 'asm' or '__attribute__' before 'void' 47

Error invalid preprocessing directive #asm 145

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