Here is an example with variable time of timer.
ADC Volt - PORTA.0
LCD PORT C
PUSH BUTTONS PORTB.0-7
LED/OUTPUT PORTD.0-7
TIMER1 PRESCALER
TCCR1A=0b00000000;
TCCR1B=0b00000010; //8
COUNTER VALUE
TCNT1=55535;
CALCULATION
IF 65535-X = Y AND
WE ASSIGN TCNT1=Y;
TIMER CODE WILL BE EXECUTED AFTER EVERY X MICRO-SECS
--------------------------------------------------------------------
#include mega16.h //8 M Hz
#include delay.h
#include stdio.h
// Alphanumeric LCD Module functions
#asm
.equ __lcd_port=0x15 ;PORTC
#endasm
#include lcd.h
// I2C Bus functions
#asm
.equ __i2c_port=0x12 ;PORTD
.equ __sda_bit=3
.equ __scl_bit=2
#endasm
#include
#define ADC_VREF_TYPE 0x20
// Read the 8 most significant bits of the AD conversion result
unsigned char read_adc(unsigned char adc_input)
{
ADMUX=adc_input | (ADC_VREF_TYPE & 0xff);
// Delay needed for the stabilization of the ADC input voltage
delay_us(10);
// Start the AD conversion
ADCSRA|=0x40;
// Wait for the AD conversion to complete
while ((ADCSRA & 0x10)==0);
ADCSRA|=0x10;
return ADCH;
}
// global variables
//unsigned int freq_array[]={50,100,150,200,250,300,350,400,450,500,550,600,650,700,750,800,850,900,950,1000} ;
//unsigned int no_of_pulses[]={2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40} ;
//unsigned int pc_array[]={1,2,5,10,20,50,100,200,500,1000} ;
void PC_OUTPUTS(void);
void DELAY(void);
void ADC_DELAY(unsigned int);
void READ_VALUES(void);
void CODE(void);
unsigned int actual_delay_time,volt;
void WRITE_TO_EEPROM(void);
unsigned int FREQ_COUNTER=2;
unsigned int PC_COUNTER=1;
unsigned char adc_volt;
unsigned char str_buffer[20];
unsigned int BTN_0=0;
unsigned int BTN_1=0;
unsigned int BTN_2=0;
unsigned int BTN_3=0;
unsigned int BTN_4=0;
unsigned int ON_OFF_FLAG=1; //CAL ON/OFF flag
//Timer 0 overflow interrupt service routine
interrupt [TIM1_OVF] void timer1_ovf_isr(void)
{
TCNT1=actual_delay_time;
PORTD.7=~PORTD.7;
}
void main(void)
{
// Input/Output Ports initialization
// Port A initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTA=0x00;
DDRA=0x00;
// Port B initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTB=0xFF;
DDRB=0x00; //input push buttons
// Port C initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTC=0x00;
DDRC=0xff; //output lcd
// Port D initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTD=0x00;
DDRD=0xff; //output led
// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
// Mode: Normal top=FFh
// OC0 output: Disconnected
TCCR0=0x00;
TCNT0=0x00;
OCR0=0x00;
// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: Timer1 Stopped
// Mode: Normal top=FFFFh
// OC1A output: Discon.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
// Timer1 Overflow Interrupt: Off
// Input Capture Interrupt: Off
// Compare A Match Interrupt: Off
// Compare B Match Interrupt: Off
TCCR1A=0x00;
TCCR1B=0x00;
TCNT1H=0x00;
TCNT1L=0x00;
ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;
TCNT1=55535;
TCCR1A=0b00000000;
TCCR1B=0b00000010; //SELECT CLOCK HRER CS
// Timer/Counter 2 initialization
// Clock source: System Clock
// Clock value: Timer2 Stopped
// Mode: Normal top=FFh
// OC2 output: Disconnected
ASSR=0x00;
TCCR2=0x00;
TCNT2=0x00;
OCR2=0x00;
// External Interrupt(s) initialization
// INT0: Off
// INT1: Off
// INT2: Off
MCUCR=0x00;
MCUCSR=0x00;
//Timer(s)/Counter(s) Interrupt(s) initialization
//TIMSK=0x00;
TIMSK=0b00000100;
// Analog Comparator initialization
// Analog Comparator:
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;
SFIOR=0x00;
ADMUX=ADC_VREF_TYPE & 0xff;
ADCSRA=0xA6;
SFIOR&=0x1F;
PORTD.2=0;
PORTD.3=0;
// I2C Bus initialization
i2c_init();
//WRITE_TO_EEPROM(); //this will reset both var to 0
READ_VALUES();
//INIT LCD
lcd_init(20);
lcd_clear();
lcd_putsf("ETM");
delay_ms(1000);
#asm("sei")
//START FROM THE LAST SAVED
DELAY();
PC_OUTPUTS();
// Watchdog Timer initialization
// Watchdog Timer Prescaler: OSC/256k
#pragma optsize-
WDTCR=0x1C;
WDTCR=0b00001111;
#ifdef _OPTIMIZE_SIZE_
#pragma optsize+
#endif
while (1)
{
//read voltage from PORTA.0 0 - 255
WDTCR=0b00001111;
adc_volt=read_adc(0); //100 us
if (ON_OFF_FLAG==1)
{
DELAY();
}
else
{
PORTD.7=0;
}
WDTCR=0b00001111;
CODE();
delay_ms(20);
}; //END OF WHILE LOOP
} //END OF MAIN
void CODE()
{
//CAL ON OFF
if (PINB.4 == 0 && BTN_4==0)
{
if (ON_OFF_FLAG==1)
{
ON_OFF_FLAG=0;
lcd_gotoxy(14,1);
lcd_putsf(" OFF");
PORTD.7=0;
TCCR1A=0b00000000;
TCCR1B=0b00000000; //STOP TIMER
}
else
{
ON_OFF_FLAG=1;
lcd_gotoxy(14,1);
lcd_putsf(" ON");
PC_OUTPUTS();
TCCR1A=0b00000000;
TCCR1B=0b00000010; //START TIMER prescaler=8
}
BTN_4=1;
}
if (PINB.4 == 1)
BTN_4=0;
//INCREASE NO OF PULSES PORTB 0 PIN
if (PINB.0 == 0 && BTN_0==0)
{
if (FREQ_COUNTER < 40)
{
FREQ_COUNTER=FREQ_COUNTER+2;
WRITE_TO_EEPROM();
}
BTN_0=1;
}
if (PINB.0 == 1)
BTN_0=0;
//DECREASE NO OF PULSES PORTB 1 PIN
if (PINB.1 == 0 && BTN_1==0)
{
if (FREQ_COUNTER > 2)
{
FREQ_COUNTER=FREQ_COUNTER - 2;
WRITE_TO_EEPROM();
}
BTN_1=1;
}
if (PINB.1 == 1)
BTN_1=0;
//INCREASE IN PC COUNT PORTB 2 PIN
if (PINB.2 == 0 && BTN_2==0)
{
if (PC_COUNTER < 10)
{
PC_COUNTER++;
PC_OUTPUTS();
WRITE_TO_EEPROM();
}
BTN_2=1;
}
if (PINB.2 == 1)
BTN_2=0;
//DECREAE IN PC COUNT PORTB 2 PIN
if (PINB.3 == 0 && BTN_3==0)
{
if (PC_COUNTER > 1)
{
PC_COUNTER--;
PC_OUTPUTS();
WRITE_TO_EEPROM();
}
BTN_3=1;
}
if (PINB.3 == 1)
BTN_3=0;
//BATTERY INDICATION PORTB 5 PIN - LO 6 - OK 7 - CH
if (PINB.6 == 0)
{
lcd_gotoxy(14,0);
lcd_putsf("BAT OK");
}
else if (PINB.7 == 0)
{
lcd_gotoxy(14,0);
lcd_putsf("BAT CH");
}
else if (PINB.5 == 0)
{
lcd_gotoxy(14,0);
lcd_putsf("BAT LO");
}
else
{
lcd_gotoxy(14,0);
lcd_putsf(" ");
}
}
//------------------------------------------------------------------------------
// Procedure: PC_OUTPUTS
// Inputs: none
// Return: none
// Description: Vary the 5 PC signals
//------------------------------------------------------------------------------
void PC_OUTPUTS(void)
{
switch (PC_COUNTER)
{
case 1:
PORTD.0=0;
PORTD.1=0;
PORTD.4=1;
PORTD.5=0;
PORTD.6=1;
lcd_gotoxy(0,1);
lcd_putsf("PULSE MAG 1 PC");
break;
case 2:
PORTD.0=0;
PORTD.1=1;
PORTD.4=0;
PORTD.5=1;
PORTD.6=0;
lcd_gotoxy(0,1);
lcd_putsf("PULSE MAG 2 PC");
break;
case 3:
PORTD.0=1;
PORTD.1=0;
PORTD.4=1;
PORTD.5=1;
PORTD.6=0;
lcd_gotoxy(0,1);
lcd_putsf("PULSE MAG 5 PC");
break;
case 4:
PORTD.0=0;
PORTD.1=0;
PORTD.4=1;
PORTD.5=1;
PORTD.6=0;
lcd_gotoxy(0,1);
lcd_putsf("PULSE MAG 10 PC");
break;
case 5:
PORTD.0=0;
PORTD.1=1;
PORTD.4=1;
PORTD.5=0;
PORTD.6=0;
lcd_gotoxy(0,1);
lcd_putsf("PULSE MAG 20 PC");
break;
case 6:
PORTD.0=1;
PORTD.1=0;
PORTD.4=1;
PORTD.5=0;
PORTD.6=0;
lcd_gotoxy(0,1);
lcd_putsf("PULSE MAG 50 PC");
break;
case 7:
PORTD.0=0;
PORTD.1=0;
PORTD.4=1;
PORTD.5=0;
PORTD.6=0;
lcd_gotoxy(0,1);
lcd_putsf("PULSE MAG 100 PC");
break;
case 8:
PORTD.0=0;
PORTD.1=1;
PORTD.4=0;
PORTD.5=0;
PORTD.6=0;
lcd_gotoxy(0,1);
lcd_putsf("PULSE MAG 200 PC");
break;
case 9:
PORTD.0=1;
PORTD.1=0;
PORTD.4=0;
PORTD.5=0;
PORTD.6=0;
lcd_gotoxy(0,1);
lcd_putsf("PULSE MAG 500 PC");
break;
case 10:
PORTD.0=0;
PORTD.1=0;
PORTD.4=0;
PORTD.5=0;
PORTD.6=0;
lcd_gotoxy(0,1);
lcd_putsf("PULSE MAG 1000PC");
break;
default:
PORTD.0=0;
PORTD.1=0;
PORTD.4=1;
PORTD.5=1;
PORTD.6=0;
lcd_gotoxy(0,1);
//sprintf(str_buffer,"ERROR PC - %u",PC_COUNTER) ;
lcd_putsf("INC/DEC");
PC_COUNTER=1;
};
}
//------------------------------------------------------------------------------
// Procedure: WRITE_TO_EEPROM
// Inputs: none
// Return: none
// Description: Writes both variable to eeprom
//------------------------------------------------------------------------------
void WRITE_TO_EEPROM()
{
i2c_start();
i2c_write(0xA0);
i2c_write(0x00);
i2c_write((unsigned char)FREQ_COUNTER);
i2c_write((unsigned char)PC_COUNTER);
i2c_stop();
delay_ms(10);
}
//------------------------------------------------------------------------------
// Procedure: READ_VALUES
// Inputs: none
// Return: none
// Description: Read freq counter, PC Counter var from eeprom
//------------------------------------------------------------------------------
void READ_VALUES()
{
i2c_start();
i2c_write(0xA0);
i2c_write(0x00);
i2c_start();
i2c_write(0xA1);
FREQ_COUNTER = i2c_read(0);
delay_ms(10);
i2c_start();
i2c_write(0xA0);
i2c_write(0x01);
i2c_start();
i2c_write(0xA1);
PC_COUNTER = i2c_read(0);
i2c_stop();
delay_ms(10);
}
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//------------------------------------------------------------------------------
// Procedure: ADC_DELAY
// Inputs: DELAY (STEP) TIME
// Return: none
// Description: DELAY +/- 2.5%
//------------------------------------------------------------------------------
void ADC_DELAY(unsigned int delay_time)
{
int a;
a=delay_time / 1000;
if (a < 1)
a=1;
volt=(unsigned int)adc_volt;
if (volt > 0 && volt < 128)
{
if (delay_time < 501)
actual_delay_time= delay_time - (( 50 - ( 2 * volt ) / 10 ) * a)/2;
else
actual_delay_time= delay_time - ( 50 - ( 2 * volt ) / 10 ) * a;
}
if (volt > 127 && volt < 256)
{
volt=volt - 127;
if (delay_time < 501)
actual_delay_time= delay_time + ( ( ( 4 * volt ) / 10 ) * a)/2 ;
else
actual_delay_time= delay_time + ( ( 4 * volt ) / 10 ) * a ;
}
if (volt == 0)
actual_delay_time= delay_time - (5 * (delay_time / 100) );
lcd_gotoxy(0,2);
sprintf(str_buffer,"%u,%u,%u ",delay_time,actual_delay_time,adc_volt) ;
lcd_puts(str_buffer);
actual_delay_time=65535-actual_delay_time;
TCNT1=actual_delay_time;
WDTCR=0b00001111;
}
//------------------------------------------------------------------------------
// Procedure: DELAY
// Inputs: none
// Return: none
// Description: Vary the Delay of signal
//------------------------------------------------------------------------------
void DELAY(void)
{
switch (FREQ_COUNTER)
{
case 2:
ADC_DELAY(10000);
//delay_ms(10);
lcd_gotoxy(0,0);
lcd_putsf("PULSES 2 ");
break;
case 4:
ADC_DELAY(5000);
//delay_ms(5);
lcd_gotoxy(0,0);
lcd_putsf("PULSES 4 ");
break;
case 6:
ADC_DELAY(3333);
//delay_us(3333);
lcd_gotoxy(0,0);
lcd_putsf("PULSES 6 ");
break;
case 8:
ADC_DELAY(2500);
//delay_us(2500);
lcd_gotoxy(0,0);
lcd_putsf("PULSES 8 ");
break;
case 10:
ADC_DELAY(2000);
//delay_ms(2);
lcd_gotoxy(0,0);
lcd_putsf("PULSES 10 ");
break;
case 12:
ADC_DELAY(1667);
//delay_us(1667);
lcd_gotoxy(0,0);
lcd_putsf("PULSES 12 ");
break;
case 14:
ADC_DELAY(1428);
//delay_us(1428);
lcd_gotoxy(0,0);
lcd_putsf("PULSES 14 ");
break;
case 16:
ADC_DELAY(1250);
//delay_us(1250);
lcd_gotoxy(0,0);
lcd_putsf("PULSES 16 ");
break;
case 18:
ADC_DELAY(1111);
//delay_us(1111);
lcd_gotoxy(0,0);
lcd_putsf("PULSES 18 ");
break;
case 20:
ADC_DELAY(1000);
//delay_ms(1);
lcd_gotoxy(0,0);
lcd_putsf("PULSES 20 ");
break;
case 22:
ADC_DELAY(909);
//delay_us(909);
lcd_gotoxy(0,0);
lcd_putsf("PULSES 22 ");
break;
case 24:
ADC_DELAY(833);
//delay_us(833);
lcd_gotoxy(0,0);
lcd_putsf("PULSES 24 ");
break;
case 26:
ADC_DELAY(769);
//delay_us(769);
lcd_gotoxy(0,0);
lcd_putsf("PULSES 26 ");
break;
case 28:
ADC_DELAY(714);
//delay_us(714);
lcd_gotoxy(0,0);
lcd_putsf("PULSES 28 ");
break;
case 30:
ADC_DELAY(667);
//delay_us(667);
lcd_gotoxy(0,0);
lcd_putsf("PULSES 30 ");
break;
case 32:
ADC_DELAY(625);
//delay_us(625);
lcd_gotoxy(0,0);
lcd_putsf("PULSES 32 ");
break;
case 34:
ADC_DELAY(588);
//delay_us(588);
lcd_gotoxy(0,0);
lcd_putsf("PULSES 34 ");
break;
case 36:
ADC_DELAY(556);
//delay_us(556);
lcd_gotoxy(0,0);
lcd_putsf("PULSES 36 ");
break;
case 38:
ADC_DELAY(526);
// delay_us(526);
lcd_gotoxy(0,0);
lcd_putsf("PULSES 38 ");
break;
case 40:
ADC_DELAY(500);
//delay_us(500);
lcd_gotoxy(0,0);
lcd_putsf("PULSES 40 ");
break;
default:
ADC_DELAY(500);
//delay_us(500);
lcd_gotoxy(0,0);
//sprintf(str_buffer,"ERROR-%u",FREQ_COUNTER) ;
lcd_putsf("INC/DEC");
FREQ_COUNTER=2;
};
}
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