ls164.c

来自「数字表头的应用介绍 数字表头的应用介绍」· C语言 代码 · 共 34 行

#define LS164_C

#include "includes.h"
/******************************************/
//该硬件为74ls164＋cd4511
/******************************************/

void  init164(void)
{
   DDRD |= (1<<clk)|(1<<dat);    //设置为输出
}

void  write164(unsigned char  x)
{
    unsigned char  i,ch;

    ch = x;
    OutPort &= ~(1<<clk);      //  CLK
    for(i=0; i<8; i++){
        if(ch & 0x80)
        {
            OutPort |= 0x80;   //数据为1
        }
        else
        {
            OutPort &= ~0x80;  //数据为0
        }
        ch <<= 1;
        OutPort |= (1<<clk);
        asm("nop");
        OutPort &= ~(1<<clk);
    }
}