|
/*****************************************************
This program was produced by the
CodeWizardAVR V1.24.8c Professional
Automatic Program Generator
?Copyright 1998-2006 Pavel Haiduc, HP InfoTech s.r.l.
http://www.hpinfotech.com
Project :
Version :
Date : 2006-12-5
Author : F4CG
Company : F4CG
Comments:
Chip type : ATmega48
Clock frequency : 1.000000 MHz
Memory model : Small
External SRAM size : 0
Data Stack size : 128
*****************************************************/
#include <mega48.h>
#include <delay.h>
#define uchar unsigned char
#define uint unsigned int
// External Interrupt 0 service routine
/***************************************************
周期固定为1.688毫秒,1/4T高电平+3/4T低电平为“0”,3/4T高电平+1/4T低电平为“1”。
所以遥控接收头出来的信号,1/4T低电平+3/4T高电平为“0”,3/4T低电平+1/4T高电平为“1”。
编码共有12位,前面五位为3位起始码+2位用户码,后面跟7位指令码。
****************************************************/
interrupt [EXT_INT0] void ext_int0_isr(void)
{
uint user_code,temp;
uchar i;
for( i=0;i<12;i++ )
{
temp = 4000;
while( ((PIND&0B00000100)==0B00000100) && (temp!=0) ){temp--;}
delay_us(800);
if( (PIND&0B00000100)==0B00000000 )
{
user_code |= (1<<i);
delay_us(700);
}
else
{
user_code &= ~(1<<i);
}
}
user_code &=0x001f;
if ( user_code==0x0002) PORTB ^= (1<<0);
else if ( user_code==0x0004) PORTB ^= (1<<1);
else if ( user_code==0x0008) PORTB ^= (1<<2);
else if ( user_code==0x0010) PORTB ^= (1<<3);
}
void mcu_init(void)
{
// Crystal Oscillator division factor: 8
#pragma optsize-
CLKPR=0x80;
CLKPR=0x03;
#ifdef _OPTIMIZE_SIZE_
#pragma optsize+
#endif
// Input/Output Ports initialization
// Port B initialization
// Func7=Out Func6=Out Func5=Out Func4=Out Func3=Out Func2=Out Func1=Out Func0=Out
// State7=0 State6=0 State5=0 State4=0 State3=0 State2=0 State1=0 State0=0
PORTB=0xFF;
DDRB=0xFF;
// Port D initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTD=0x00;
DDRD=0x00;
// External Interrupt(s) initialization
// INT0: On
// INT0 Mode: Falling Edge
EICRA=0x02;
EIMSK=0x01;
EIFR=0x01;
PCICR=0x00;
// Global enable interrupts
#asm("sei")
}
void main(void)
{
mcu_init();
while (1)
{};
} |
阿莫论坛20周年了!感谢大家的支持与爱护!!
一只鸟敢站在脆弱的枝条上歇脚,它依仗的不是枝条不会断,而是自己有翅膀,会飞。
|