start.cpp

Go to the documentation of this file.

#include "Arduino.h"
//#define DEBUG_LCD    //disable for Simulation
#include "_debug.h"
#define SDA PINC0
#define CLK PINC1

void setup()
{   
    // PINC no Pullups
    cli(); //no interrupts  
}
void loop()
{
    
    //wait for falling edge of clk
    loop_until_bit_is_clear(PINC,CLK);  
    // wait for rising edge of clk
    loop_until_bit_is_set(PINC,CLK); 
    // read data bit (LSB first) 
    uint8_t databit = PINC&(1<<SDA); 
    
    // put data bit to receive buffer
    
    static uint8_t receivebuffer = 0;   // static variables remember their values between subroutine calls (like global vars) 
    static uint8_t bitcounter = 0; 
    static uint8_t eepromaddress1 = 0xF;
    
    receivebuffer |= (databit << bitcounter);  // bring bit to position
    bitcounter++;
    // if bit 8 received transfer to eeprom
    if (bitcounter == 8) {
       bitcounter = 0; 
       eeprom_busy_wait(); 
       eeprom_write_byte((uint8_t *) eepromaddress1,receivebuffer);      // needs a pointer, not a number as address  -->
                                                                         // explicite type conversion by (int *) x
       eepromaddress1++;
    }

    
}