AVR定时器使用范例

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21、#210;ÔÉèÖö¨Ê±Æ÷µÄ¶¨Ê±³¤¶Ì¡£*/TIMER0 initialize - prescale:1024 /*¶¨Ê±Æ÷Ô¤·ÖƵ£¬Ô¤·ÖƵ

22、;ÓÉTCCRnµÄCS02,CS01,CS00È·¶¨£¬ÏêÇé²é¿´Êý¾ÝÊÖ²á*/ WGM: Normal/*¶¨Ê±Æ÷*/ desired value: 20mSec/*¶¨Ê±Æ÷Æ

23、8;ÍûÉ趨ʱ¼ä*/ actual value: 19.861mSec (0.7%)/*¶¨Ê±Æ÷ʵ¼Ê¶¨Ê±Ê±¼ä£¬Îó²î±ÈÀý*/void timer0_init(void) TCCR0 = 0

24、x00; /stop/*¶¨Ê±Æ÷Í£Ö¹£¬TCCR0¼Ä´æÆ÷ÍêÈ«¿ØÖÆtimer0µÄÔËÐÐÇé¿ö£¬Ïêϸ¿É²Î&

25、#191;¼Êý¾ÝÊֲᡣ*/ TCNT0 = 0x71; /set count/*¶¨Ê±Æ÷¼Ä´æÆ÷¿ªÊ¼Öµ*/ OCR0 = 0x8F; /set compare/*¶¨Ê±Æ÷±È½Ï&#

26、214;µ*/ TCCR0 = 0x05; /start timer/*¶¨Ê±Æ÷¿ªÊ¼*/#pragma interrupt_handler timer0_comp_isr:20void timer0_comp_isr(void) /compare occured TCNT0=OCR0 /*¶¨Ê±Æ÷±È½ÏÆ¥ÅäÖÐ

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28、ÖÆPWM*/#pragma interrupt_handler timer0_ovf_isr:10void timer0_ovf_isr(void) TCNT0 = 0x71; /reload counter value /*¶¨Ê±Æ÷Òç³öºóÐèÒªÖØÔØTCNTn£¬È»ºóÔÚ

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30、202;±µÄ³ÌÐò¡£*/call this routine to initialize all peripheralsvoid init_devices(void) /stop errant interrupts until set up CLI(); /disable all interrupts port_init(); timer0_init(); MCUCR = 0x00; GICR = 0x00; TIMSK = 0x03; /timer interrupt sources/*Õ

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35、º/ICC-AVR application builder : 2006-11-24 11:46:03/ Target : M16/ Crystal: 7.3728Mhz#include #include const led_table16=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x88,0x86,0xc7,0xc4,0x83,0x8b;/ 0f/¶¨ÒåLEDµÄÊý¾Ý±í£¬&#

36、215;¢Ò⣬ֻÓÐ0µ½9ÊÇÕýÈ·µÄ£¬A-FÎÒûÓÐÈÏÕæд¡£typedef unsigned char uint8;uint8 i;void port_init(void) PORTA = 0x00; DDRA = 0xF

37、F; PORTB = 0x00; DDRB = 0x00; PORTC = 0x00; /m103 output only DDRC = 0x00; PORTD = 0x00; DDRD = 0x00;/TIMER1 initialize - prescale:1024/ WGM: 0) Normal, TOP=0xFFFF/ desired value: 1Sec/ actual value: 1.000Sec (0.0%)void timer1_init(void) TCCR1B = 0x00; /stop TCNT1H = 0xE3; /setup TCNT1L = 0xE1; OCR1AH = 0x1C; OCR1AL = 0x1F;