Main.c

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/* This file has been prepared for Doxygen automatic documentation generation.*/
//  Include files
#include "Main.h"
#include "Temperature.h"
#include "RTC.h"
#include "UART.h"
#include "Lcd_functions.h"
#include "LCD_driver.h"
#include "Buttons.h"


void main(void)
{
    Initialization();       // Call the initialization function

    while(1)                // endless main loop
    {
        Time_update();          // update clock

        ADC_conversion();       // measure the temperature

        Store_RX_data();        // store data from receivebuffer to SRAM

        Send_TX_data();         // load data from SRAM to transmit-buffer and start transmission

        CheckButtons();         // check if any input from user on the STK500-buttons

        LCD_update();           // call LCD routine
    }
}


void Initialization(void)
{
    CLKPR = (1<<CLKPCE);        // set Clock Prescaler Change Enable
    CLKPR = (1<<CLKPS1) | (1<<CLKPS0);  // set prescaler = 8, Inter RC 8Mhz / 8 = 1Mhz

    OSCCAL_calibration();       // calibrate the OSCCAL byte

    CONTRAST = 0x0F;            // set the LCD contrast register to max

    DDRB = 0xF0;                // set PORTB as output to drive the LEDS on STK500

    DDRE = 0x00;                // set PORTE as input to read the SWITCHES on STK500

    PWM_init();                 // initialize Timer1 with PWM

    RTC_init();                 // start timer2 asynchronous, used for RTC clock

// Select either Single Ended or Differential ADC measurement, comment out the other
    ADC_init(SingleEnded);     // initialize the ADC, select "Single_ended" or "Differential"
//    ADC_init(Differential);     // initialize the ADC, select "Single_ended" or "Differential"

    UART_init(12);              // set up the UART

    LCD_Init();                 // initialize the LCD

    LCDsetupData();             // set the display to scroll the init text

    __enable_interrupt();       //enable global interrupt
}


void Delay(int i)
{
    int j,k;

    for(k=1;k<=i;k++)
    {
        for(j=1;j<=124;j++);
    }
}


void OSCCAL_calibration(void)
{
    unsigned char calibrate = FALSE;
    int temp;
    unsigned char tempL;

    CLKPR = (1<<CLKPCE);        // set Clock Prescaler Change Enable
    // set prescaler = 8, Inter RC 8Mhz / 8 = 1Mhz
    CLKPR = (1<<CLKPS1) | (1<<CLKPS0);

    TIMSK2 = 0;             //disable OCIE2A and TOIE2

    ASSR = (1<<AS2);        //select asynchronous operation of timer2 (32,768kHz)

    OCR2A = 200;            // set timer2 compare value

    TIMSK0 = 0;             // delete any interrupt sources

    TCCR1B = (1<<CS10);     // start timer1 with no prescaling
    TCCR2A = (1<<CS20);     // start timer2 with no prescaling

    while(ASSR & (0x01 | 0x04));       //wait for TCN2UB and TCR2UB to be cleared

    Delay(1000);    // wait for external crystal to stabilise

    while(!calibrate)
    {
        __disable_interrupt();  // disable global interrupt

        TIFR1 = 0xFF;   // delete TIFR1 flags
        TIFR2 = 0xFF;   // delete TIFR2 flags

        TCNT1H = 0;     // clear timer1 counter
        TCNT1L = 0;
        TCNT2 = 0;      // clear timer2 counter

        while ( !(TIFR2 && (1<<OCF2A)) );   // wait for timer2 compareflag

        TCCR1B = 0; // stop timer1

        __enable_interrupt();  // enable global interrupt

        if ( (TIFR1 && (1<<TOV1)) )
        {
            temp = 0xFFFF;      // if timer1 overflows, set the temp to 0xFFFF
        }
        else
        {   // read out the timer1 counter value
            tempL = TCNT1L;
            temp = TCNT1H;
            temp = (temp << 8);
            temp += tempL;
        }

        if (temp > 6250)
        {
            OSCCAL--;   // the internRC oscillator runs to fast, decrease the OSCCAL
        }
        else if (temp < 6120)
        {
            OSCCAL++;   // the internRC oscillator runs to slow, increase the OSCCAL
        }
        else
            calibrate = TRUE;   // the interRC is correct

        TCCR1B = (1<<CS10); // start timer1
    }
}

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