Project mẫu AVR (phần 2)

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AVR Atmel
Project mẫu AVR (phần 2)

Project mẫu AVR (phần 2)

19/03/2012 0 2981

13.Pulse period by timer1

Sơ đồ mạch điện:

Sơ đồ mạch điện.

Chương trình mẫu:

Chip type           : ATmega32
Program type        : Application
Clock frequency     : 6.000000 MHz
Memory model        : Small
External SRAM size : 0
Data Stack size     : 512
*****************************************************/

#include "mega32.h"

// Standard Input/Output functions
#include "stdio.h"

unsigned char ov_counter;
unsigned int starting_edge, ending_edge;
unsigned long clocks;
unsigned int period_out;
bit done = 0;

// Timer 1 overflow interrupt service routine
interrupt [TIM1_OVF] void timer1_ovf_isr(void)
{
// Place your code here
++ov_counter;
}

// Timer 1 input capture interrupt service routine
interrupt [TIM1_CAPT] void timer1_capt_isr(void)
{
// Place your code here
    ending_edge = (unsigned int)ICR1H*256 + (unsigned int)ICR1L;
    clocks = (unsigned long)ending_edge \
            + ((unsigned long)ov_counter*65536) \
            - (unsigned long) starting_edge;
    period_out = clocks/750;
    done = 1;
    ov_counter = 0;
    starting_edge = ending_edge;
}

// Declare your global variables here

void main(void)
{
// Declare your local variables here

// 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=0x00;
DDRB=0x00;

// 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=0x00;

// 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=0x00;

// 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: 750.000 kHz
// Mode: Normal top=FFFFh
// OC1A output: Discon.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Rising Edge
// Timer 1 Overflow Interrupt: On
// Input Capture Interrupt: On
// Compare A Match Interrupt: Off
// Compare B Match Interrupt: Off
TCCR1A=0x00;
TCCR1B=0x42;
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: Timer 2 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=0x24;

// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Receiver: On
// USART Transmitter: On
// USART Mode: Asynchronous
// USART Baud rate: 9600
UCSRA=0x00;
UCSRB=0x18;
UCSRC=0x86;
UBRRH=0x00;
UBRRL=0x26;

// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;
SFIOR=0x00;

// Global enable interrupts
#asm("sei")

while (1)
{
    if(done){
        printf("Pulse period in ms = %u\n\r", period_out);
        done = 0;
    }
};
}

14.ADC_Complete_Int.

Sơ đồ mạch điện:

Sơ đồ mạch điện.

Chương trình mẫu:

Chip type           : ATmega32
Program type        : Application
Clock frequency     : 7.372800 MHz
Memory model        : Small
External SRAM size : 0
Data Stack size     : 512
*****************************************************/

#include "mega32.h"
#include "delay.h"

// Standard Input/Output functions
#include"stdio.h"

#define ADC_VREF_TYPE 0x00

// Declare your global variables here
bit adc_done = 0; // Global ADC done flag bit

// ADC interrupt service routine
interrupt [ADC_INT] void adc_isr(void)
{
unsigned int adc_result;
// Read the AD conversion result
adc_result = ADCW;
// Always clear ADC IF bit
ADCSRA |= 0x10;
// print this value
printf("Done interrupt! ADC value = %d\n\r",adc_result);
// Set done bit
adc_done = 1;
}

// Trigger ADC conversion
void adc_trigger_conv(unsigned char adc_input)
{
// Clear done bit
adc_done = 0;
// Select adc channel
ADMUX=adc_input|ADC_VREF_TYPE;
// Start the AD conversion
ADCSRA|=0x40;
// Don't wait for complete, exist now.
}

void main(void)
{
// Declare your local variables here

// 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=0x00;
DDRB=0x00;

// 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=0x00;

// 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=0x00;

// 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: Timer 1 Stopped
// Mode: Normal top=FFFFh
// OC1A output: Discon.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
// Timer 1 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;

// Timer/Counter 2 initialization
// Clock source: System Clock
// Clock value: Timer 2 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;

// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;
SFIOR=0x00;

// ADC initialization
// ADC Clock frequency: 115.200 kHz
// ADC Voltage Reference: AREF pin
ADMUX=ADC_VREF_TYPE;
ADCSRA=0x8E;

// Global enable interrupts
#asm("sei")

// trigger for the first time
adc_trigger_conv(0);

while (1)
{
// Place your code here
if (adc_done) adc_trigger_conv(0);
delay_ms(1000);
};
}

15.ADC_Differential.

Sơ đồ mạch điện:

Sơ đồ mạch điện.

Chương trình mẫu:

#include "mega32.h"
#include "delay.h"

// Standard Input/Output functions
#include "stdio.h"

#define ADC_VREF_TYPE 0x00

// User's defines
// Here, we choose ADC0 as Neg Input
// ADC1 as Pos Input
// Gain set to 10x
// Look up on table in datasheet --> MUX4:0 = 0b01001
#define ADC_DIFF_TYPE (0b01001)

// Convert value from ADC data register with its sign (+/-)
int convert_adc_value(unsigned int adc_10bit_input_value)
{
    int result;
    result = (int)(adc_10bit_input_value & 0x1FF);
    result = (adc_10bit_input_value & (1 << 9)) ? (-(512 - result)) : result;
    return result;
}

// Read the AD conversion result
int read_diff_adc(void)
{
    ADMUX = ADC_VREF_TYPE | ADC_DIFF_TYPE;
    // Start the AD conversion
    ADCSRA|=0x40;
    // Wait for the AD conversion to complete
    while ((ADCSRA & 0x10)==0);
    ADCSRA|=0x10;
    return ADCW;
}

// Declare your global variables here

void main(void)
{
// Declare your local variables here
unsigned int u16_adc;
int s16_adc;