x24c44.c

这个是一个用Keil C51编写的带SRAM的EEPROM芯片X24C44的驱动程序示例

#include <AT89X51.H>
#include "com.h"
#include "X24C44.H"
//-----------------------------------------------
sbit LED_TEST=P3^4;//LED blink test
//*********************************************//
//       delay nearly n*0.05s ;;n=20->1s      //
//********************************************//
void Delay(unsigned int n)
{	unsigned int i;
	for(;n>0;n--)
	{	for(i=0;i<10000;) i++;  }
}
//------------------LED Blink for Test----------------------------
void Blink(unsigned char t,unsigned char n)
{	unsigned char i;
	for(i=0;i<n;i++)
	{	LED_TEST=0;Delay(t);LED_TEST=1;Delay(t);	}
}
//----------------------------------------------------------------

//-------------------------------------
//#####################################
//-------------------------------------
void main(void)
{
	unsigned char i,t;
	unsigned int n;
	Init_Com();
	Blink(3,3);
	SendString("Now test the X24C44!!!");CT();
//--------------------
	Recall_Ram();
	Write_Enable();
//----------------------------

	SendString("Now write word to X24C44!!!");CT();
	for(i=0;i<5;i++)
	{
		WriteWord_X24C44(i,i);
		Blink(3,1);
		SendChar(i+0x30);
	}
	CT();
	SendString("Write over!!!");CT();
//-----------------------------
	Store_Ram();
	SendString("Now Store_Ram!!!");CT();
	//-----------------
	Blink(3,3);
	//-----------------
	Recall_Ram();
	SendString("Now Recall_Ram!!!");CT();


	SendString("Now read word from X24C44!!!");CT();
	for(i=0;i<5;i++)
	{
		n=ReadWord_X24C44(i);
		Blink(3,1);
		SendChar(((unsigned char) n)+0x30);
	}
	CT();
	SendString("Read over!!!");CT();
//-----------------	
	//for(;;);
//-----------------------------
//-------------------------------------------------------------
//----------------------------
	Blink(3,3);
	Write_Enable();//!!!!!!!!must set it!!!!!
//---------------------------
	SendString("Now write char to X24C44!!!");CT();
	for(i=0;i<5;i++)
	{
		WriteChar_X24C44(31-i,4-i);
		Blink(3,1);
		SendChar(4-i+0x30);
	}
	CT();
	SendString("Write over!!!");CT();

//-----------------------------
	//-----------------
	Blink(3,3);
	//-----------------

	SendString("Now read char from X24C44!!!");CT();
	for(i=0;i<5;i++)
	{
		t=ReadChar_X24C44(31-i);
		Blink(3,1);
		SendChar(t+0x30);
	}
	CT();
	SendString("Read over!!!");CT();
//-----------------------------
	Write_Disable();
//--------------------
	for(;;);
}
//-------------------------------------
//#####################################
//-------------------------------------