1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

#include <avr/io.h>

#include "msgeq7.h"

//Three LEDSs connected to PWM Outputs

#define SET_LED1_BRIGHTNESS(x) (OCR2=x)

#define SET_LED2_BRIGHTNESS(x) (OCR1BL=x)

#define SET_LED3_BRIGHTNESS(x) (OCR1AL=x)

void IO_init(void);

void TIMER_init(void);

void ADC_init(void);

unsigned char ReadAnalog(void);

int main(void)

{

unsigned char result[7];

IO_init();

TIMER_init();

ADC_init();

/* Replace with your application code */

msgeq7_reset();

while (1)

{

msgeq7_getValues((char *)&result);

SET_LED1_BRIGHTNESS(result[0]);

SET_LED2_BRIGHTNESS(result[3]);

SET_LED3_BRIGHTNESS(result[6]);

}

}

void IO_init(void){

//PORTB as output

DDRB=0XFF;

//PORTB as current source

PORTB=0XFF;

//PORTD pins D7 and D4 as output

DDRD|=(1<<DDRD7)|(1<<DDRD4);

}

void TIMER_init(void){

//timer2 in fast PWM mode and inverting output on OCR2

TCCR2|=(1<<COM21)|(1<<COM20)|(1<<WGM21)|(1<<WGM20)|(1<<CS20);

//tiemr1 in fast PWM mode and inverting output on OCR1A and OCR1B

TCCR1A|=((1<<COM1A0)|(1<<COM1A1)|(1<<WGM10)|(1<<COM1B0)|(1<<COM1B1));

TCCR1B|=(1<<WGM12)|(1<<CS10);

}

void ADC_init(){

//Select internal referance and Channel 0

ADMUX|=(1<<REFS0)|(1<<REFS1);

//Enable ADC and ADC frequency=clock frequency/4

ADCSRA|=(1<<ADEN)|(1<<ADPS1);

}

unsigned char ReadAnalog(void){

//interger to store 10-bit ADC value

unsigned int result=0;

//start conversion

ADCSRA|=(1<<ADSC);

//wait till converion is done

while(ADCSRA&(1<<ADSC));

//read result

result=ADCW;

//return 10-bit value mapped to 8-bit value i.e 1024/4=256

return (unsigned char)(result/4);

}

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

#ifndef INCFILE1_H_

#define INCFILE1_H_

#define STROBE_PORT PORTD

#define STROBE_PIN PORTD4

#define RESET_PORT PORTD

#define RESET_PIN PORTD7

void msgeq7_reset(void);

void msgeq7_getValues(char * const);

#endif /* INCFILE1_H_ */

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

#define F_CPU 16000000

#include <avr/io.h>

#include <util/delay.h>

#include "msgeq7.h"

unsigned char ReadAnalog(void);

void msgeq7_reset(){

STROBE_PORT|=(1 << STROBE_PIN); //make sure that STORBE pin is high before RESET

_delay_us(100);

RESET_PORT|=(1 << RESET_PIN);

_delay_us(100);

RESET_PORT &= ~(1 << RESET_PIN);

_delay_us(100);

}

void msgeq7_getValues(char * const result){

unsigned char i=0;

for(i=0;i<7;i++){

STROBE_PORT&= ~(1 << STROBE_PIN);

_delay_us(100);

result[i]=ReadAnalog();

if(result[i]<60)

result[i]=0;

STROBE_PORT|=(1 << STROBE_PIN);

_delay_us(100);

}

}