spi_send.c

51单片机SPI模式

#include "reg52.h"

#define uchar unsigned char
#define uint  unsigned int 

//---------------------------//
sbit SPISCLK =P1^0;
sbit MOSI    =P1^1;
sbit MISO    =P1^2;
sbit CS	     =P1^3;
//---------------------------//

void SPI_Send(uchar dat)
{
	uchar i;
	CS=1;
	while(CS){;}
	for(i=0;i<8;i++)
		{
			SPISCLK=1;
			while(SPISCLK){;}
			if(dat&0x80)
				MISO=1;
			 else MISO=0;
			dat<<=1;
			while(~SPISCLK){;}
		}	
}

void main()
{
	uchar i;
	while(1)
	{
	for(i=0;i<20;i++)
		{
			SPI_Send(i);
		}
	}
}