spitt4.c

单片机c8051F310

#include "c8051f020.h"



void delay(unsigned long temp)
{
unsigned long i;
for(i=0;i<temp;i++);
}




void Oscillator_Init()
{
    unsigned int i = 0;
    OSCXCN    = 0x67;
    for (i = 0; i < 3000; i++);  // Wait 1ms for initialization
    while ((OSCXCN & 0x80) == 0);
    OSCICN    = 0x0B;
}



void spisend(int a)
{	
	SPIF=0;
	SPI0DAT = a;
	while ( SPIF == 0);
	SPIF=0;
}

void writeable()
{		P4=0xff;
			
		SPI0CFG   = 0xc0;
		
	spisend(0x80);
		
		SPI0CFG   = 0xc7;
	spisend(0x30);
 		P4=0xfd;//delay(1);
}


void write()
{		P4=0xff;
		SPI0CFG   = 0xc0;

			spisend(0x80);

		SPI0CFG   = 0xc7;
			spisend(0x40);
			spisend(0x55);
			spisend(0x11);
		P4=0xfd;//delay(1);
}


int read()
{int num;
P4=0xff;
			SPI0CFG   = 0xc0;
				spisend(0x80);
			SPI0CFG   = 0xc7;
				spisend(0x80);delay(50);

	    
			//SPI0CFG   = 0x80;
			//spisend(0x80);
				
				
	SPI0CFG   = 0x87;

	spisend(0x0f);
	num=SPI0DAT;SPIF=0;
	
	
		spisend(0x0f);
	num=(num<<8)+SPI0DAT;SPIF=0;

		P4=0xfd;//delay(1);
	return num;
}



void main()
{int need;
	WDTCN     = 0xDE;
    WDTCN     = 0xAD;
		Oscillator_Init();

	P1MDIN    = 0x0F;
	//P0MDOUT   = 0x14;
    XBR0      = 0x97;
    XBR1      = 0x1F;
    XBR2      = 0xC4;

	SPI0CFG   = 0xc7;
   	SPI0CN    = 0x03;
    SPI0CKR   = 0x4d;


	P4=0xfd;
	delay(10);

		writeable();
		delay(10);
	
		write();	
	 	delay(1000);
		
				
	
		need=read();
		delay(1);
		
		while(1);
}