以前學AVR時候寫的一些程序，分享一下
#include
#include
// Alphanumeric LCD Module functions
#asm
.equ __lcd_port=0x18 ;PORTB
#endasm
#include
#define uchar unsigned char
#define uint unsigned int
#define BIT(x) 1<<(x)
#define DQ_IN DDRC&=~BIT(2)
#define DQ_OUT DDRC|=BIT(2)
#define DQ_SET PORTC|=BIT(2)
#define DQ_CLR PORTC&=~BIT(2)
#define DQ_R PINC&BIT(2)
uint wan,qian,bai,shi;
uchar ds18b20_reset(void)
{
uchar i;
DQ_OUT;
DQ_CLR;
delay_us(500);
DQ_SET;
delay_us(100);
DQ_IN;
i=DQ_R;
delay_us(500);
return i;
}
void ds18b20_write_byte(uchar value)
{
uchar i;
for(i=0;i<8;i++){
DQ_OUT;
DQ_CLR;
delay_us(10);
if(value&BIT(0))
{
DQ_SET;
}
delay_us(100);
DQ_SET;
value=value>>1;
}
}
uchar ds18b20_read_byte(void)
{
uchar i,value;
for(i=0;i<8;i++)
{
value=value>>1;
DQ_OUT;
DQ_CLR;
delay_us(10);
DQ_SET;
DQ_IN;
if(DQ_R)
{
value|=0x80;
}
delay_us(50);
}
return value;
}
// Declare your global variables here
void main(void)
{ uchar i,j;
double temp;
// Declare your local variables here
// Input/Output Ports initialization
// Port A 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
PORTA=0x00;
DDRA=0x00;
// Port B 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
PORTB=0x00;
DDRB=0x00;
// Port C 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
PORTC=0x00;
DDRC=0x00;
// 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;
// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
// Mode: Normal top=FFh
// OC0 output: Disconnected
TCCR0=0x00;
TCNT0=0x00;
OCR0=0x00;
// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: Timer 1 Stopped
// Mode: Normal top=FFFFh
// OC1A output: Discon.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
// Timer 1 Overflow Interrupt: Off
// Input Capture Interrupt: Off
// Compare A Match Interrupt: Off
// Compare B Match Interrupt: Off
TCCR1A=0x00;
TCCR1B=0x00;
TCNT1H=0x00;
TCNT1L=0x00;
ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;
// Timer/Counter 2 initialization
// Clock source: System Clock
// Clock value: Timer 2 Stopped
// Mode: Normal top=FFh
// OC2 output: Disconnected
ASSR=0x00;
TCCR2=0x00;
TCNT2=0x00;
OCR2=0x00;
// External Interrupt(s) initialization
// INT0: Off
// INT1: Off
// INT2: Off
MCUCR=0x00;
MCUCSR=0x00;
// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=0x00;
// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;
SFIOR=0x00;
// LCD module initialization
lcd_init(16);
while (1)
{ds18b20_reset();
ds18b20_write_byte(0xcc);
ds18b20_write_byte(0x44);
delay_us(20);
ds18b20_reset();
ds18b20_write_byte(0xcc);
ds18b20_write_byte(0xbe);
i=ds18b20_read_byte();
j=ds18b20_read_byte();
temp=(j*256.0+i)*6.25;
wan=(int)temp/1000;
qian=(int)temp00/100;
bai=(int)temp0/10;
shi=(int)temp;
lcd_gotoxy(0,0);
lcd_putchar(wan+48);
lcd_putchar(qian+48);
lcd_putchar('.');
lcd_putchar(bai+48);
lcd_putchar(shi+48);
delay_ms(100);
// Place your code here
};
}
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