www.pudn.com > iccavrUCOS_m64.rar > 74164.c

 
#ifndef  OS_MASTER_FILE 
#include "includes.h" 
#endif 
 
void  init164(void){ 
    DDRB |= 0x01; 
    DDRD |= 0xC0; 
} 
 
void  write164(unsigned char  x){ 
    unsigned char  i,ch; 
 
    ch = x; 
    PORTB &= ~0x01;      //  ÏûÒþ 
    PORTD &= ~0x40;      //  CLK 
    for(i=0; i<8; i++){ 
        if(ch & 0x80) 
            PORTD |= 0x80; 
        else 
            PORTD &= ~0x80; 
        ch <<= 1; 
        PORTD |= 0x40; 
        asm("nop"); 
        PORTD &= ~0x40; 
    } 
    PORTB |= 0x01;      //  ÏÔʾ 
}