input.c

用89C2051实现的软PLC。PLC程序存在24C04,用按健输入程序

#include "reg51.h"

sbit load  = P3^5;
sbit input_clk = P3^4;
sbit input_data = P3^3;                 

unsigned int input(void)
{
    unsigned int temp = 0;
	int i = 0;
    
	input_clk = 0;
	load = 0;
	load = 1;
	if (input_data == 1)
	    temp = 1;
    for (i;i < 15;i++)
	{
	   input_clk = 1;
	   temp = temp << 1;
	   if (input_data == 1)
	       temp = temp | 0x01;
       input_clk = 0;
	}
	return temp;
}