eeprom_24lc64.c

cortex-m0 LCD1602程序

/*---------------------------------------------------------------------------------------------------------*/
/*                                                                                                         */
/* Copyright(c) 2009 Nuvoton Technology Corp. All rights reserved.                                         */
/*                                                                                                         */
/*---------------------------------------------------------------------------------------------------------*/
#include <stdio.h>
#include "NUC1xx.h"
#include "Driver\DrvGPIO.h"
#include "Driver\DrvI2C.h"
#include "Driver\DrvSYS.h"
#include "EEPROM_24LC64.h"

void Write_24LC64(uint32_t address,uint8_t data )
{
	uint32_t i;
	SystemCoreClock = DrvSYS_GetHCLKFreq(); 
  //Open I2C1 and set clock = 50Kbps 
	DrvI2C_Open(I2C_PORT1, 50000);
	
   	//send i2c start
	DrvI2C_Ctrl(I2C_PORT1, 1, 0, 0, 0);	//set start
	while (I2C1->I2CON.SI == 0);			//poll si flag
	//send writer command
	I2C1->I2CDAT = 0XA0;					//send writer command
    DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 0); //clr si flag
    while( I2C1->I2CON.SI == 0 );		    //poll si flag
	//send address high
	I2C1->I2CDAT = (address>>8)&0XFF;	
	DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1); //clr si and set ack	
	while( I2C1->I2CON.SI == 0 );			//poll si flag
	//send address low
	I2C1->I2CDAT = address&0XFF;	
	DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1); //clr si and set ack	
	while( I2C1->I2CON.SI == 0 );			//poll si flag
	//send data
	I2C1->I2CDAT = data;					//write data to 
	DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1); //clr si and set ack	
	while( I2C1->I2CON.SI == 0 );			//poll si flag
   	//send i2c stop
	DrvI2C_Ctrl(I2C_PORT1, 0, 1, 1, 0); //send stop	
	while( I2C1->I2CON.STO);
	//while( I2C1->CON.SI == 0 );
	for(i=0;i<60;i++);
	DrvI2C_Close(I2C_PORT1);
  	
	for(i=0;i<6000;i++);
	for(i=0;i<6000;i++);
}

uint8_t Read_24LC64(uint32_t address)
{
	uint8_t TEMP;
  //Open I2C1 and set clock = 50Kbps
	SystemCoreClock = DrvSYS_GetHCLKFreq(); 
	DrvI2C_Open(I2C_PORT1, 50000);
	//send i2c start
    DrvI2C_Ctrl(I2C_PORT1, 1, 0, 1, 0);	 	//set start
	while (I2C1->I2CON.SI == 0);				//poll si flag
	 
   	//send writer command
	I2C1->I2CDAT = 0XA0;
    DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 0);	   //clr si
    while( I2C1->I2CON.SI == 0 );			   //poll si flag
	
	//send address high
    I2C1->I2CDAT = (address>>8)&0XFF;	
	DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1);    //clr si and set ack
	while( I2C1->I2CON.SI == 0 );			   //poll si flag
    
	//send address low
	I2C1->I2CDAT = address&0XFF;	
	DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 0);    //clr si	and set ack
	while( I2C1->I2CON.SI == 0 );			   //poll si flag
	
	//send start flag
	DrvI2C_Ctrl(I2C_PORT1, 1, 0, 1, 0);    //clr si and send start	
	while( I2C1->I2CON.SI == 0 );			   //poll si flag
	
	//send read command
	I2C1->I2CDAT = 0XA1;
	DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1);    //clr si
    while( I2C1->I2CON.SI == 0 );			   //poll si flag

	//resive data
	I2C1->I2CDAT = 0XFF;
	DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 0);    //clr si	
	while( I2C1->I2CON.SI == 0 );			   //poll si flag
	TEMP= I2C1->I2CDAT;
	//send i2c stop
 	DrvI2C_Ctrl(I2C_PORT1, 0, 1, 1, 0);    //clr si and set stop
	while( I2C1->I2CON.STO);
	DrvI2C_Close(I2C_PORT1);

	return TEMP; 
}