基于AVRmega16时钟校时.doc

//ICC-AVR application builder : 2011-4-25 17:21:44 // Target : M16 // Crystal: 4.0000Mhz #include iom16v.h #include macros.h flash unsigned char led_7[10]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07, 0x7F,0x6F}; unsigned char time[2],time_set[2]; unsigned char time_disbuf[4];//显示缓冲区 unsigned char posit; int time_count; int key_time_count;//中断次数计数单元 unsigned char time_1s,time_10ms; unsigned char set_on=0; unsigned char point_on=0; unsigned char clock_state = 4,return_time =0; void HC595Send(unsigned char date) { unsigned char i; for(i=0;i8;i++) { if(date(1(7-i))) { PORTA|=(10); } else { PORTA=~(10); } PORTB=~(11); PORTB|=(11); } PORTB=~(10); PORTB|=(10); } void display(void)//4为数码管的动态扫描函数 { PORTD |=0xf0; HC595Send(~led_7[time_disbuf[posit]]); if(point_on(posit==(clock_state))) PORTD|=0xf0; else PORTD =~(1(7-posit)); if(++posit=4)posit =0; } void port_init(void) { PORTA =0x80; DDRA =0x01; DDRB =0x03;//led的位输出 PORTB =0x00; PORTD =0xf8; DDRD =0xf0; } void time_buffer(unsigned char *time) { time_disbuf[3]=time[1]%10; time_disbuf[2]=time[1]/10; time_disbuf[1]=time[0]%10; time_disbuf[0]=time[0]/10; } #pragma interrupt_handler timer0_comp_isr:iv_TIM0_COMP void timer0_comp_isr(void) { display(); if(++key_time_count=5) { key_time_count=0; time_10ms=1;//10ms到 } if(!(++time_count % 200))point_on = !point_on; if(time_count=500) { time_count=0; time_1s=1;//1s到 } } int press_key() { if((PINA(17))==0) return 1; if((PIND(13))==0) return 2; else return 0; } #define key_state_0 0 #define key_state_1 1 #define key_state_2 2 unsigned char read_key(void) { static unsigned char key_state=0; unsigned char key_return=0; static unsigned char key_value; switch(key_state) { case key_state_0: if(press_key()!=0) { key_state=key_state_1; key_value=press_key(); } break;