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<?xml version="1.0" encoding="UTF-8" standalone="no"?> | ||
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<inputType id="de.innot.avreclipse.tool.linker.input.861535777" name="OBJ Files" superClass="de.innot.avreclipse.tool.linker.input"> | ||
<additionalInput kind="additionalinputdependency" paths="$(USER_OBJS)"/> | ||
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</cproject> |
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<?xml version="1.0" encoding="UTF-8"?> | ||
<projectDescription> | ||
<name>External EEPROM</name> | ||
<comment></comment> | ||
<projects> | ||
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<name>org.eclipse.cdt.managedbuilder.core.genmakebuilder</name> | ||
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</projectDescription> |
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avrtarget/ClockFrequency=1000000 | ||
avrtarget/ExtRAMSize=0 | ||
avrtarget/ExtendedRAM=false | ||
avrtarget/MCUType=atmega32 | ||
avrtarget/UseEEPROM=false | ||
avrtarget/UseExtendedRAMforHeap=true | ||
eclipse.preferences.version=1 |
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eclipse.preferences.version=1 | ||
encoding/<project>=UTF-8 |
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/****************************************************************************** | ||
* | ||
* Module: External EEPROM | ||
* File Name: external_eeprom.c | ||
* Description: Source file for the External EEPROM Memory | ||
* Author: Ibrahim Mohamed | ||
* | ||
*******************************************************************************/ | ||
|
||
#include "external_eeprom.h" | ||
#include "twi.h" | ||
|
||
/******************************************************************************* | ||
* Functions DEFINITIONS * | ||
*******************************************************************************/ | ||
|
||
uint8 EEPROM_writeByte(uint16 u16addr,uint8 u8data) | ||
{ | ||
/* Send the Start Bit */ | ||
TWI_start(); | ||
if (TWI_getStatus() != TWI_START) | ||
return ERROR; | ||
|
||
/* Send the device address, we need to get A8 A9 A10 address bits from the | ||
* memory location address and R/W=0 (write) */ | ||
TWI_writeByte((uint8)(0xA0 | ((u16addr & 0x0700)>>7))); | ||
if (TWI_getStatus() != TWI_MT_SLA_W_ACK) | ||
return ERROR; | ||
|
||
/* Send the required memory location address */ | ||
TWI_writeByte((uint8)(u16addr)); | ||
if (TWI_getStatus() != TWI_MT_DATA_ACK) | ||
return ERROR; | ||
|
||
/* write byte to eeprom */ | ||
TWI_writeByte(u8data); | ||
if (TWI_getStatus() != TWI_MT_DATA_ACK) | ||
return ERROR; | ||
|
||
/* Send the Stop Bit */ | ||
TWI_stop(); | ||
|
||
return SUCCESS; | ||
|
||
} | ||
|
||
uint8 EEPROM_readByte(uint16 u16addr,uint8 *u8data) | ||
{ | ||
/* Send the Start Bit */ | ||
TWI_start(); | ||
if (TWI_getStatus() != TWI_START) | ||
return ERROR; | ||
|
||
/* Send the device address, we need to get A8 A9 A10 address bits from the | ||
* memory location address and R/W=0 (write) */ | ||
TWI_writeByte((uint8)((0xA0) | ((u16addr & 0x0700)>>7))); | ||
if (TWI_getStatus() != TWI_MT_SLA_W_ACK) | ||
return ERROR; | ||
|
||
/* Send the required memory location address */ | ||
TWI_writeByte((uint8)(u16addr)); | ||
if (TWI_getStatus() != TWI_MT_DATA_ACK) | ||
return ERROR; | ||
|
||
/* Send the Repeated Start Bit */ | ||
TWI_start(); | ||
if (TWI_getStatus() != TWI_REP_START) | ||
return ERROR; | ||
|
||
/* Send the device address, we need to get A8 A9 A10 address bits from the | ||
* memory location address and R/W=1 (Read) */ | ||
TWI_writeByte((uint8)((0xA0) | ((u16addr & 0x0700)>>7) | 1)); | ||
if (TWI_getStatus() != TWI_MT_SLA_R_ACK) | ||
return ERROR; | ||
|
||
/* Read Byte from Memory without send ACK */ | ||
*u8data = TWI_readByteWithNACK(); | ||
if (TWI_getStatus() != TWI_MR_DATA_NACK) | ||
return ERROR; | ||
|
||
/* Send the Stop Bit */ | ||
TWI_stop(); | ||
|
||
return SUCCESS; | ||
} | ||
|
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/****************************************************************************** | ||
* | ||
* Module: External EEPROM | ||
* File Name: external_eeprom.h | ||
* Description: Header file for the External EEPROM Memory | ||
* Author: Ibrahim Mohamed | ||
* | ||
*******************************************************************************/ | ||
|
||
#ifndef EXTERNAL_EEPROM_H_ | ||
#define EXTERNAL_EEPROM_H_ | ||
|
||
#include "std_types.h" | ||
|
||
/******************************************************************************* | ||
* Preprocessor Macros * | ||
*******************************************************************************/ | ||
#define ERROR 0 | ||
#define SUCCESS 1 | ||
|
||
/******************************************************************************* | ||
* Functions Prototypes * | ||
*******************************************************************************/ | ||
|
||
uint8 EEPROM_writeByte(uint16 u16addr,uint8 u8data); | ||
uint8 EEPROM_readByte(uint16 u16addr,uint8 *u8data); | ||
|
||
|
||
|
||
|
||
#endif /* EXTERNAL_EEPROM_H_ */ |
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