main.c

毕设时做的CAN总线通讯电路板原理图

#include <reg51.h>

sbit out_dat =	P1^1;
sbit out_clk = 	P1^2;
sbit out_oe	 =	P1^3;
sbit out_stb =	P1^4;

unsigned char code table[3][3]={
{0x92,0x49,0x24},
{0x49,0x24,0x92},
{0x24,0x92,0x49}};


void init_port(void)
{
	out_clk=0;
	out_dat=0;
	out_oe=0;
	out_stb=0;
}

void delay_ms(unsigned char val)
{
	unsigned int i;
	
	while(--val)
	{
		i=1000;
		while(--i);
	}
	
}

void send_byte(unsigned char dat)
{
	unsigned char i;
	
	for(i=0;i<8;i++)
	{
		if(dat & 0x80)
		out_dat=1;
		else
		out_dat=0;
		out_clk=1;
		out_clk=0;
		dat<<=1;
	}
}

void send_data(unsigned char *dat,unsigned char len)
{
	unsigned char i;
	
//	out_stb=0;
	for(i=0;i<len;i++)
	{
		send_byte(dat[i]);
	}
//	out_stb=1;
//	out_stb=0;
}

void main(void)
{
	unsigned char i,j,k;

	init_port();
	delay_ms(200);

	while(1)
 	{
		for(i=0;i<3;i++)
		{
			out_stb=0;
		 	for(j=0;j<32;j++)
			{
				for(k=0;k<3;k++)
				{
					send_data((unsigned char *)(&table[i][k]),0x03);
				}
			}
			out_stb=1;
			out_stb=0;
			delay_ms(200);
			delay_ms(200);
		}
	}
}