spi.c

这是DS1620温度传感器的读写温度程序

#include <spi.h>

unsigned char combuf[9];
//unsigned char wr_combuf[8];
bit timeover_flag=0;
bit receive_ren=0;
unsigned char counter = 0;
void init_spi()
{
	PCON = 0x00;   //smod = 0
	TMOD=0x20;     //定时器工作在方式2
	TH1=0xFA;
	TL1=0xFA;

	SM0 = 0;        //串行口工作在方式2，波特率为9600，采用查询方式工作
	SM1 = 1;
	SM2 = 0;
	
	ES = 1;
    RI = 0;
    TI = 0;

	PT0=0;
	PS=1;
    EA=1;
	TR1=1;
	REN = 1;// recieve
	
	timeover_flag=0;

}


void spi_send(unsigned char *buf,unsigned char len)
{
	unsigned char i=0;
	ES=0;
	for(i=0;i<len;i++)
	{
		
	     SBUF=buf[i];
	     while(!TI);
	     TI=0;
	}
	ES=1;
}

void receive (void) interrupt 4 using 3
{
    unsigned char buf=0;
	RI = 0;
   	buf=SBUF;
	timeover_flag=1;
	combuf[counter]=buf;
	counter++;
	if(counter>7)
	{
		receive_ren=1;
		counter=0;
	}
}