start.cpp

Go to the documentation of this file.

#include <Arduino.h>
//#define DEBUG_LCD
#include "_debug.h"

#define CLK PORTB1
#define DATA PORTB2
#define TRIGGER PINB0
#define ADCINPUT 4

//some macros for easier typing
#define DATA_LOW  PORTB &= ~_BV(DATA);
#define DATA_HIGH PORTB |= _BV(DATA);
#define CLK_LOW   PORTB &= ~_BV(CLK);
#define CLK_HIGH  PORTB |= _BV(CLK);

void setup()
{       
    DDRB |= _BV(CLK)|_BV(DATA); // Set CLK and DATA as output
    PORTB |= _BV(TRIGGER);  // Set PB0 as input with pullup
    
    // ADU 10 Bit
    ADCSRA=(1<<ADEN); //enable  
    ADCSRA =  (1<<ADPS2) | (1<<ADPS1) | (1<<ADPS0); //super slow for high precision 
    ADMUX=(0<<REFS1) | (1<<REFS0); // ADC Voltage Reference: AVCC pin
    ADMUX |= (0<<ADLAR);  //right adjust -- for docu only
    ADMUX |= ADCINPUT; // ADC4 as input -- sets all 3 bits 
//  DDRB |= _BV(TRIGGER); //simulation only: start with TRIGGER = 1 to simulate falling edge    
}
void onePulse(){
  CLK_LOW   DATA_HIGH  CLK_HIGH  DATA_HIGH  CLK_LOW   DATA_HIGH
}
void zeroPulse(){
  CLK_LOW   DATA_LOW  CLK_HIGH  DATA_LOW  CLK_LOW   DATA_LOW  
}

void serialout(uint16_t dat){
   //data are right adjusted, so start with right bits
   // 10 Bits max
   for (int i=0; i<10; i++){
       if (bit_is_set(dat,i)) 
           onePulse(); 
       else 
           zeroPulse(); 
   }    
}

void loop()
{
    loop_until_bit_is_clear(PINB,PINB0); //wait for falling edge    

    ADCSRA|=(1<<ADSC);  //start adu conversion
    loop_until_bit_is_clear(ADCSRA,ADSC); //wait until conversion finished      
    // serialout(5); 
    serialout(ADC); 
    
    loop_until_bit_is_set(PINB,PINB0);  //wait for key released
    //wait for 30ms debounce time    
}