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original in en Guido Socher

en to zh SEVEN

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// call this once:
// initialize LCD display, cursor off
lcd_init(LCD_DISP_ON);

// to write some text we first clear
// the display:
lcd_clrscr();
lcd_puts("Hello");
// go to the second line:
lcd_gotoxy(0,1); 
lcd_puts("LCD");

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volatile static int analog_result;
volatile static unsigned char analog_busy;

analog_busy=1; // busy mark the ADC function
channel=0; // measure ADC0 
// use internal 2.56V ref
outp((1<<REFS1)|(1<<REFS0)|(channel & 0x07),ADMUX);
outp((1<<ADEN)|(1<<ADIE)|(1<<ADIF)|(1<<ADPS2),ADCSR);
sbi(ADCSR,ADSC); // start conversion

SIGNAL(SIG_ADC) {
        unsigned char adlow,adhigh;
        adlow=inp(ADCL); /* read low first, two lines. Do not combine
                          the two lines into one C statement */
        adhigh=inp(ADCH);
        analog_result=(adhigh<<8)|(adlow & 0xFF);
        analog_busy=0;
}

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• ADIE�� ����ADC�жϣ�=��������SIGNAL(SIG_ADC)��
  
  
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• ADPS�� ADCʱ��Ԥ���ڱ��أ� ��������Ϊ����ʹ�õ�ʱ��Ƶ�ʱ�Ԥ�������ӳ�֮�󣬵õ�һ��50��200KHz֮���ֵ�� ���г�������Ϊ2^ADPS���������ã�ADPS2=1, ADPS1=0, ADPS0=0��������100=ʮ����4����2⁴=16�����Գ�������Ϊ16����1MHz��ʱ��Ƶ�ʺܺ��ʡ�
  
  

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        // set RTS pin:
        int arg=TIOCM_RTS;
        ioctl(fd, TIOCMBIS, &arg);

        // clear RTS pin:
        int arg=TIOCM_RTS;
        ioctl(fd, TIOCMBIC, &arg);

USB��RS232

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• Download page for this article: the linuxI2Ctemp_lcd software, diagrams, software updates
• How to program the atmega8 with gcc: November2004 article 352
• Datasheet for the Atmega8: go to http://www.atmel.com/ and select products->Microcontrollers ->AVR-8 bit RISC->Documentation->datasheets
  (local copy, pdf, 2479982 bytes)