Elektronická škrtiaca klapka: Rozdiel medzi revíziami

#include <avr/io.h>
#include "uart.h"
#define F_CPU 16000000UL
#define BAUDRATE       9600
#include <stdio.h>
FILE mystdout = FDEV_SETUP_STREAM(uart_putc, NULL, _FDEV_SETUP_WRITE);
                              
int main(void)
{
  adc_init();
  hw_init();
  uart_init();
  stdout = &mystdout;           // printf() works from now
  unsigned int measuredValue;

  DDRD|=(1<<PD6);        // Init PD5 and PD6 pins as output


  //Initialize Timer0

  TCNT0=0;                        // Set Initial Timer value

  OCR0A=0;                       // Set Initial Pulse width
  

                                 //Set fast PWM mode + clear OC0A and set OC0B on compare match

  TCCR0A|=(1<<COM0A1)|(1<<COM0B1)|(1<<WGM01)|(1<<WGM00);

  TCCR0B|=(1<<CS02)|(1<<CS00);      // Set prescaller 1024 and start timer
  
  while(1)
  {
	measuredValue = (adc_read(4)-150)/2;
//	measuredValue = adc_read(4);
	printf("hodnota: %04d \r",measuredValue);
	
	
	   OCR0A = measuredValue;
	      
  }
  
  return(0);
}

#include <avr/io.h>

void adc_init(void);                                  
unsigned int adc_read(char a_pin);

#include <stdio.h>
#include "adc.h"

void adc_init(void) {
  ADMUX = (1 << REFS0); // reference voltage set to AVcc
  ADCSRA = (1 << ADEN) | (1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0); // enable ADC and set prescaler to 128
}

unsigned int adc_read(char a_pin) {
  a_pin &= 0x07; // limit input to 0-7
  ADMUX = (ADMUX & 0xF8) | a_pin; // select ADC channel with safety mask
  ADCSRA |= (1 << ADSC); // start conversion
  while (ADCSRA & (1 << ADSC)); // wait for conversion to complete
  return ADC; // return the ADC value
}

/* ************************************************************************* */
/* FileName:             uart.h                                              */
/* ************************************************************************* */

#define LED PB5  // internal on-board LED 

 /* na testovanie su uz zadefinovane */
 // bit_is_set(PINB, SW1)
 // bit_is_clear(PINB, SW1)

 /* na cakanie su preddefinovane slucky */
 // loop_until_bit_is_set(PINB, SW1);    // cakanie na uvolnenie tlacitka
 // loop_until_bit_is_clear(PINB, SW1);  // cakanie na stlacenie tlacitka


#define set_bit(ADDRESS,BIT) (ADDRESS |= (1<<BIT))
#define clear_bit(ADDRESS,BIT) (ADDRESS &= ~(1<<BIT))

#ifndef UART_H_
#define UART_H_

#include <stdio.h>

#define BAUD_PRESCALE  (((F_CPU / (BAUDRATE * 16UL))) - 1)  // vzor?ek z datasheetu

void hw_init( void );
void uart_init( void );
     
/* Following definition is compatible with STDIO.H, for more
 * information see https://www.appelsiini.net/2011/simple-usart-with-avr-libc/
 */
	 
int uart_putc( char c, FILE *stream );
void uart_puts( const char *s );

char uart_getc( void );

void delay(int delay); 

#endif /* UART_H_ */

/* ************************************************************************* */
/* FileName:             uart.c                                              */
/* ************************************************************************* */

#include <avr/io.h>
#include <util/delay.h>
#include "uart.h"

void hw_init( void )
{ 
  DDRB |= (1<<LED);    // PORTB.5 kde je LED ma byt OUTPUT
  /* sem si mozete dopisat svoje vlastne inicializacne prikazy */ 	
}

void uart_init( void ) 
{
//  for different BAUD rate change the project settings, or uncomment 
//  following two lines:	
//	#undef  BAUD           // avoid compiler warning
//  #define BAUD 115200
	
   #include <util/setbaud.h>  // requires defined BAUD
   
   UBRR0H = UBRRH_VALUE;
   UBRR0L = UBRRL_VALUE;
   #if USE_2X                 // defined in setbaud.h 
    UCSR0A |= (1 << U2X0);
   #else
    UCSR0A &= ~(1 << U2X0);
   #endif


    UCSR0C = _BV(UCSZ01) | _BV(UCSZ00); /* 8-bit data */
    UCSR0B = _BV(RXEN0) | _BV(TXEN0);   /* Enable RX and TX */	
}


int uart_putc( char c, FILE *stream )
{
   if (c == '\n') 
      uart_putc('\r',stream);
   
   loop_until_bit_is_set(UCSR0A, UDRE0); /* Wait until data register empty. */
   UDR0 = c;
   return 0;
}


void uart_puts(const char *s)
{
  /* toto je vasa uloha */
}

char uart_getc(void) 
{
    loop_until_bit_is_set(UCSR0A, RXC0); /* Wait until data exists. */
    return UDR0;
}

void delay(int delay)      // vlastna funkcia pre dlhsie casy 
{
  for (int i=1; i<=delay; i++)
  _delay_ms(1);
}