📄 用mega128做的航模用电调 (ourdev_cn 我们的电子开发社区).htm
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<BR> if((TCCR1B&0x40)==0) <BR> {
<BR>
<BR> down=ICR1L; //Read low byte first (important)
<BR> down|=(int)ICR1H << 8; //Read high byte and shift into top byte
<BR> T=down/16; <BR> //OCR1B=T;
<BR> //if(T>=1000) <BR> //{T=1000;}
<BR> //OCR0 = 254;
<BR> a=T;
<BR> //T=T-994;
<BR>
<BR> if(T<=994)
<BR> OCR0=0x00;
<BR> else
<BR> if(T>=1994)
<BR> OCR0=0xFF;
<BR> else
<BR> OCR0 = (T/3.921);
<BR> // a=T/4; <BR> printf("T=%u,down=%u,a=%d
<BR>",T,down,a); <BR> TCCR1B^=0x40; <BR>TIFR=(1<<ICF1);
<BR> /* <BR> <BR> //TCNT1=0;
<BR> //timer 1 input capture event, read (int)value in ICR1 using;
<BR> down=ICR1L; //Read low byte first (important)
<BR> down|=(int)ICR1H << 8; //Read high byte and shift into top byte
<BR> ICR1=0; <BR> TCNT1=0; <BR> a=down-up;
<BR> T=a/16; <BR>OCR1B = T; <BR>TCCR1B^=0x40;
<BR>TIFR=(1<<ICF1); <BR>printf("T=%d,down=%d,up=%d <BR>",T,down,up);
<BR><BR><BR>*/ <BR> } <BR> else <BR> { <BR> TCNT1=0;
<BR> TCCR1B^=0x40; <BR>TIFR=(1<<ICF1); <BR><BR>/*
<BR><BR>up=ICR1L; //Read low byte first (important)
<BR> up|=(int)ICR1H << 8; //Read high byte and shift into top byte
<BR> ICR1=0; <BR><BR>TCCR1B^=0x40; <BR>TIFR=(1<<ICF1);
<BR><BR><BR>*/ <BR>} <BR>} <BR><BR>//UART0 initialisation
<BR>// desired baud rate: 11520
<BR>// actual: baud rate:11520
<BR>// char size: 8 bit
<BR>// parity: Disabled <BR><BR>void uart0_init(void) <BR>{
<BR> UCSR0B = 0x00; //disable while setting baud rate
<BR> UCSR0A = 0x00; <BR> UCSR0C = 0x06;
<BR> UBRR0L = 0x08; //set baud rate lo
<BR> UBRR0H = 0x00; //set baud rate hi
<BR> UCSR0B = 0x18; <BR>}
<BR><BR>//call this routine to initialise all peripherals
<BR>void init_devices(void) <BR>{
<BR> //stop errant interrupts until set up
<BR> CLI(); //disable all interrupts
<BR> XDIV = 0x00; //xtal divider
<BR> XMCRA = 0x00; //external memory
<BR> port_init(); <BR> timer1_init(); <BR> uart0_init();
<BR> timer0_init(); <BR> <BR>
<BR> MCUCR = 0x00;
<BR> EICRA = 0x00; //extended ext ints
<BR> EICRB = 0x00; //extended ext ints
<BR> EIMSK = 0x00;
<BR> TIMSK = 0x20; //timer interrupt sources
<BR> ETIMSK = 0x00; //extended timer interrupt sources
<BR> SEI(); //re-enable interrupts
<BR> //all peripherals are now initialised <BR>}
<BR><BR>void main(void) <BR>{ <BR>int T,up,down,a;
<BR> a='d'; <BR> init_devices();
<BR> printf("ok!"); <BR> while(1) <BR> {
<BR> //printf("%u",T); <BR> } <BR> <BR>}
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width=7>2005-04-02,17:13:21 </TD>
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vAlign=top align=left width="19%" bgColor=#e8e8e8 rowSpan=2>【1楼】 <FONT
color=#000000>fsclub </FONT><BR><IMG height=140
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width=110><BR>积分：<FONT color=#000000>2182</FONT><BR>派别：<FONT
color=#000000></FONT><BR>等级：<FONT color=#000000>------</FONT><BR>来自：<FONT
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color=#000000>电调用MEGA128太浪费了吧.</FONT> </TD></TR>
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vAlign=bottom bgColor=#e8e8e8>__________________________<BR>我也改个头像....
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width=7>2005-04-02,17:58:48 </TD>
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