eeprom.c

Wiznet iRadio Source

//#define _I2C_H

#include "71x_lib.h"
#include "eeprom.h"


void Init_I2C0()
{
  //Configure I2C0
  GPIO_Config (GPIO1, I2C0_SCL_Pin| I2C0_SDA_Pin, GPIO_AF_OD);		// Alternation Open Drian setting	
  I2C_Init(I2C0);													// register initial
  I2C_FCLKConfig(I2C0);
  I2C_OnOffConfig(I2C0, ENABLE);									// I2C Interface Enable
  I2C_SpeedConfig(I2C0,I2C_Speed);									// 100KHz(Standard I2C Mode)
  I2C_AcknowledgeConfig(I2C0, ENABLE);								//Acknowledge Enable
}


void EEP_Write (u16 MemAddress, u8 Data)
{
  u16 i;

  Init_I2C0();

// Start Bit Generation
  I2C_STARTGenerate (I2C0, ENABLE);							// start bit generation 
  while (I2C_FlagStatus (I2C0,DIRECT,I2C_SB)==RESET);		//Start bit flag check(1:generation)
  //send the eeprom address
	I2C_AddressSend(I2C0,EEP_ADDR,I2C_Mode7,I2C_TX);		//7bit addressing mode, write enable
 
  while (I2C_FlagStatus (I2C0,DIRECT,I2C_ENDAD )==RESET);
  I2C_FlagClear(I2C0, I2C_ENDAD);
  //send byte address
  I2C_ByteSend(I2C0, (u8)MemAddress);
  // Wait until BTF bit is set
  while (I2C_FlagStatus (I2C0, DIRECT, I2C_BTF )==RESET);  
  
  //send the String to be written in the eeprom
  I2C_ByteSend(I2C0, Data);

  // Wait till I2C_BTF bit is set
  while (!(I2C0->SR1 & 0x08));
	
  //Generate stop condition
  I2C_STOPGenerate(I2C0, ENABLE);

  // Wait until the stop bit is sent
  while(I2C0->CR&0x2);
  for (i=0; i<0xfff; i++);
  //Disable the I2C0
  I2C_OnOffConfig (I2C0, DISABLE);

  Delay_ms(10); //DataSheet 24LC02 : Write Time = 5ms
}

/********************************************************************************/
/* Byte Read Function															*/												
/********************************************************************************/
u8 EEP_Read(u16 MemAddress)
{ 
  u8 Data;
  
  Init_I2C0();
  //Enable Start generation
  I2C_STARTGenerate (I2C0, ENABLE);
  // Wait until start condition is generated
  while (I2C_FlagStatus (I2C0,DIRECT,I2C_SB )==RESET);
  //Send the eeprom address with LSB bit reset
//  I2C_AddressSend (I2C0,(M24C08_Address|(MemAddress>>7)),I2C_Mode7,I2C_TX);
  I2C_AddressSend (I2C0,EEP_ADDR,I2C_Mode7,I2C_TX);
  //Wait end of address transmission
  while (I2C_FlagStatus (I2C0,DIRECT,I2C_ENDAD )==RESET);
  I2C_FlagClear (I2C0, I2C_ENDAD);
  //Send address of byte
  I2C_ByteSend (I2C0,(u8)MemAddress);
  //RE-START generate
  I2C_STARTGenerate (I2C0, ENABLE);

  while (I2C_FlagStatus (I2C0,DIRECT,I2C_SB )==RESET);
  //Send address with the LSB bit set
//  I2C_AddressSend (I2C0,(M24C08_Address|(MemAddress>>7)),I2C_Mode7,I2C_RX);
  I2C_AddressSend (I2C0,EEP_ADDR,I2C_Mode7,I2C_RX);
  //Test on the end of address transmission

  while (I2C_FlagStatus (I2C0,DIRECT,I2C_ENDAD )==RESET);
  I2C_FlagClear (I2C0, I2C_ENDAD);
  I2C_AcknowledgeConfig (I2C0, DISABLE);

  //Receive data
  Data= I2C_ByteReceive (I2C0);
//Generate stop condition
  I2C_STOPGenerate (I2C0, ENABLE);

  // Wait until the stop bit is sent
//  while(I2C0->CR&0x2);
//  for (i=0; i<0xff; i++);

  I2C_OnOffConfig (I2C0, DISABLE);

  return Data;
 }

/********************************************************************************/
/* Delay_ms Initial																*/												
/********************************************************************************/
void Delay_ms(u16 time)
{
  u16 i,j;
  for (i=0; i<time; i++)
    for (j=0; j<4000; j++); 
}

/******************* (C) COPYRIGHT 2003 STMicroelectronics *****END OF FILE****/