Main.c File Reference

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Detailed Description

Main loop and initialization.

Application note:

AVR064: A Temperature Monitoring System with LCD Output

Documentation:

For comprehensive code documentation, supported compilers, compiler settings and supported devices see readme.html

Author:

Atmel Corporation: http://www.atmel.com
Support email: avr@atmel.com

Name

RELEASE_1_1

Revision

1.3

RCSfile

Main.c,v

Date

2006/02/16 18:11:22

Definition in file Main.c.

#include "Main.h"
#include "Temperature.h"
#include "RTC.h"
#include "UART.h"
#include "Lcd_functions.h"
#include "LCD_driver.h"
#include "Buttons.h"

Include dependency graph for Main.c:

Go to the source code of this file.

Functions
void	Delay (int i)
	Delay-routine.
void	Initialization (void)
	Initialize the different modules of the ATmega169(P).
void	main (void)
	Main function which contains the endless main loop.
void	OSCCAL_calibration (void)
	Calibrate the internal OSCCAL byte, using the external 32,768 kHz crystal as reference.

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Function Documentation

void Delay (  int  i  )

Delay-routine. Parameters: i  - delay Definition at line 93 of file Main.c. Referenced by ADC_init(), OSCCAL_calibration(), and RTC_init(). { int j,k; for(k=1;k<=i;k++) { for(j=1;j<=124;j++); } }

void Initialization (  void   )

Initialize the different modules of the ATmega169(P). Definition at line 59 of file Main.c. References ADC_init(), CONTRAST, LCD_Init(), LCDsetupData(), OSCCAL_calibration(), PWM_init(), RTC_init(), SingleEnded, and UART_init(). Referenced by main(). { 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 } Here is the call graph for this function:

void main (  void   )

Main function which contains the endless main loop. Definition at line 36 of file Main.c. References ADC_conversion(), CheckButtons(), Initialization(), LCD_update(), Send_TX_data(), Store_RX_data(), and Time_update(). { 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 } } Here is the call graph for this function:

void OSCCAL_calibration (  void   )

Calibrate the internal OSCCAL byte, using the external 32,768 kHz crystal as reference. Definition at line 107 of file Main.c. References Delay(), FALSE, and TRUE. Referenced by Initialization(). { 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 } } Here is the call graph for this function:

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