main.c

AVR单片机C语言程序设计实例精粹

//***************************************************************
// File Name : LED.c
// Author    : Steaven
// Created   : 2008-07-26
// Modified  : 
// Revision  : V0.0
//***************************************************************

#include "iom16v.h"
#include "DataType.h"
#include "app.h"
#include "lcd.h" 

//global variables 
INT8U Key0_Flag  = 0;  //Flag of Key0 Pressed
INT8U Key1_Flag  = 0;  //Flag of Key0 Pressed
INT8U Key2_Flag  = 0;  //Flag of Key0 Pressed
INT8U Key3_Flag  = 0;  //Flag of Key0 Pressed
INT8U NoKey_Flag = 0;  //Flag of No Key Pressed

void main(void) 
{ 
	Hardware_Init();
	LCD_Reset();
	LCD_Show_String(0,0,"=*= KEY DEMO =*=");
	LCD_Show_String(1,0,"No Key Pressed! ");
	
	while(1)
	{
		if(Key0_Flag == 1)
		{
			Key0_Flag = 0;
			LCD_Show_String(1,0,"Key0 is Pressed! ");
		}
		if(Key1_Flag == 1)
		{
			Key1_Flag = 0;
			LCD_Show_String(1,0,"Key1 is Pressed! ");
		}
		if(Key2_Flag == 1)
		{
			Key2_Flag = 0;
			LCD_Show_String(1,0,"Key2 is Pressed! ");
		}
		if(Key3_Flag == 1)
		{
			Key3_Flag = 0;
			LCD_Show_String(1,0,"Key3 is Pressed! ");
		}
		if(NoKey_Flag == 1)
		{
			NoKey_Flag = 0;
			LCD_Show_String(1,0,"No Key Pressed!  ");
		}
	} 
} 

//***************************************************************
// Function    : Timer0_Interrupt                                
// Input       : none                                            
// Output      : none                                            
// Description : ATmega16 T/C0 ISR                               
//***************************************************************
#pragma interrupt_handler Timer0_Interrupt:20                    
void Timer0_Interrupt(void)                                      
{                                                                
	static INT16U key_count = 0;
	static INT8U buzzer_count = 0;
	static INT8U buzzer_status = 0;
	                                      
	//Clear Timer0 OCIF Flag                                     
	TIFR  |= 0x02;                                               
	TCNT0  = 0x00;                                              
	//Key Detection
	if(Get_Key0() == true)
	{
		Key0_Flag = 1;
		key_count = 0;
		buzzer_status = 1;
	}                                            
	if(Get_Key1() == true)
	{
		Key1_Flag = 1;
		key_count = 0;
		buzzer_status = 1;
	}
	if(Get_Key2() == true)
	{
		Key2_Flag = 1;
		key_count = 0;
		buzzer_status = 1;
	}
	if(Get_Key3() == true)
	{
		Key3_Flag = 1;
		key_count = 0;
		buzzer_status = 1;
	}
	//No Key Count
	if(key_count++ >= 500)
	{
		key_count = 0;
		NoKey_Flag = 1;
	}
	//Buzzer Control
	if(buzzer_status == 1)
	{
		Buzzer_ON();
		if(buzzer_count++ >= 50)
		{
			Buzzer_OFF();
			buzzer_status = 0;
			buzzer_count = 0;
		}
	}                                                     
} 

//=========================END OF FILE=========================//