Difference between revisions of "EEPROM"

Line 158: Line 158:
 
uint8_t a_writeBuffer_u8[5]={10,20,35,50,60};
 
uint8_t a_writeBuffer_u8[5]={10,20,35,50,60};
 
char a_readString_u8[20];
 
char a_readString_u8[20];
 +
uint32_t v_writeNumber_u32=123456789;
 +
uint32_t v_readNumber_u32=0x00;
 
char v_readChar_u8;
 
char v_readChar_u8;
 
uint8_t a_readBuffer_u8[5];
 
uint8_t a_readBuffer_u8[5];
Line 170: Line 172:
 
UART_TxString("\n\r5-Bytes= 10,20,35,50,60");
 
UART_TxString("\n\r5-Bytes= 10,20,35,50,60");
 
UART_TxString("\n\rString: hello, world");
 
UART_TxString("\n\rString: hello, world");
 +
UART_Printf("\n\r32-bit number= %L",v_writeNumber_u32);
 
EEPROM_WriteByte(10,'A');
 
EEPROM_WriteByte(10,'A');
 
EEPROM_WriteNBytes(100,a_writeBuffer_u8,5);
 
EEPROM_WriteNBytes(100,a_writeBuffer_u8,5);
 
EEPROM_WriteString(150,"hello, world");
 
EEPROM_WriteString(150,"hello, world");
 +
EEPROM_WriteNBytes(200,&v_writeNumber_u32,sizeof(v_writeNumber_u32));
  
  
Line 179: Line 183:
 
EEPROM_ReadNBytes(100,a_readBuffer_u8,5);
 
EEPROM_ReadNBytes(100,a_readBuffer_u8,5);
 
EEPROM_ReadString(150,a_readString_u8);
 
EEPROM_ReadString(150,a_readString_u8);
 +
EEPROM_ReadNBytes(200,&v_readNumber_u32,sizeof(v_readNumber_u32));
 
UART_Printf("\n\rchar:%c",v_readChar_u8);
 
UART_Printf("\n\rchar:%c",v_readChar_u8);
 
UART_TxString("\n\r5-Bytes: ");
 
UART_TxString("\n\r5-Bytes: ");
Line 184: Line 189:
 
UART_Printf("%d ",a_readBuffer_u8[i]);
 
UART_Printf("%d ",a_readBuffer_u8[i]);
 
UART_Printf("\n\rstring:%s",a_readString_u8);
 
UART_Printf("\n\rstring:%s",a_readString_u8);
 +
UART_Printf("\n\r32bit Number:%L",v_readNumber_u32);
  
  

Revision as of 17:24, 27 December 2014

EEPROM

EEPROM_WriteByte

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Defination void EEPROM_WriteByte(uint16_t v_eepromAddress_u16, uint8_t v_eepromData_u8)
Input Arguments uint16_t: eeprom_address at which eeprom_data is to be written.
uint8_t: byte of data to be to be written in eeprom.
Return Value none
Description This function is used to write the data at specified EEPROM_address..
Usage EEPROM_WriteByte(1234,25); //Writes 25 at the eeprom address 1234.



EEPROM_WriteNBytes

{{#Widget:LibTable}}
Defination void EEPROM_WriteNBytes(uint16_t v_eepromAddress_u16, uint8_t *p_ramAddress_u8, uint16_t v_numOfBytes_u16)
Input Arguments uint16_t,: eeprom_address from where the N-bytes are to be written.

uint8_t*: Pointer to the N-bytes of data to be written.
uint16_t : Number of bytes to be written

Return Value none
Description This function is used to write N-bytes of data at specified EEPROM_address.
Usage uint8_t A_RamBuffer_U8[5]={10,20,30,40,50}; // Buffer containing the data to be written in Eeprom

EEPROM_WriteNBytes(100,A_RamBuffer_U8,5); //Copies 5bytes of data from A_RamBuffer_U8 into eeprom location 100.



EEPROM_WriteString

{{#Widget:LibTable}}
Defination void EEPROM_WriteString(uint16_t v_eepromAddress_u16, char *p_stringPointer_u8)
Input Arguments uint16_t: eeprom_address where the String is to be written.

char*: Pointer to String which has to be written.

Return Value none
Description This function is used to Write a String at specified EEPROM_address.NOTE: Null char is also written into the eeprom.
Usage uint8_t A_StringBuffer_U8[20]="Hello, World"; // String to be written in eeprom

EEPROM_WriteString(50,A_StringBuffer_U8); //Copies "Hello, World" along with NULL character into eeprom location 50.



EEPROM_Erase

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Defination void EEPROM_Erase()
Input Arguments none
Return Value none
Description This function is used to erase the entire Eeprom memory.

Complete Eeprom(C_MaxEepromSize_U16) is filled with 0xFF to accomplish the Eeprom Erase.

Usage EEPROM_Erase(); //Erases the complete(C_MaxEepromSize_U16 bytes) eeprom.



EEPROM_ReadByte

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Defination uint8_t EEPROM_ReadByte(uint16_t v_eepromAddress_u16)
Input Arguments uint16_t: eeprom_address from where eeprom_data is to be read.
Return Value uint8_t: data read from Eeprom.
Description This function is used to read a byte of data from specified EEPROM_address.
Usage eeprom_data = EEPROM_ReadByte(100); reads the data from eeprom location 100 which is copied to eeprom_data



EEPROM_ReadNBytes

{{#Widget:LibTable}}
Defination void EEPROM_ReadNBytes(uint16_t v_eepromAddress_16, uint8_t *p_ramAddress_u8, uint16_t v_numOfBytes_u16)
Input Arguments uint16_t,: eeprom_address from where the N-bytes is to be read.

uint8_t*: Pointer into which the N-bytes of data is to be read.
uint16_t : Number of bytes to be Read

Return Value none
Description This function is used to Read N-bytes of data from specified EEPROM_address. The data read from the eeprom will be copied into the specified RamAddress .
Note:Care should be taken to allocate enough buffer to read the data.
Usage uint8_t A_RamBuffer_U8[20]; // Buffer to read the Eeprom data

EEPROM_ReadNBytes(1000,A_RamBuffer_U8,20); //Copies 20bytes of eeprom data(address 1000) into A_RamBuffer_U8



EEPROM_ReadString

{{#Widget:LibTable}}
Defination void EEPROM_ReadString(uint16_t v_eepromAddress_u16, char *p_destStringAddress_u8)
Input Arguments uint16_t: eeprom_address from where the String is to be read.

char*: Pointer into which the String is to be read.

Return Value none
Description This function is used to Read a String from specified EEPROM_address.The string read from eeprom will be copied to specified buffer along with NULL character.
Usage uint8_t A_StringBuffer_U8[20]; // Buffer to read the Eeprom data

EEPROM_ReadString(200,A_StringBuffer_U8); //Copies a string from eeprom(address 200) along with NULL caharacter into A_StringBuffer_U8



user guide

/* Program to illustrate the eeprom Read/Write */
#include"uart.h"
#include"delay.h"
#include"eeprom.h"
 
int main()
{
 
	uint8_t a_writeBuffer_u8[5]={10,20,35,50,60};
	char a_readString_u8[20];
	uint32_t v_writeNumber_u32=123456789;
	uint32_t v_readNumber_u32=0x00;
	char v_readChar_u8;
	uint8_t a_readBuffer_u8[5];
	uint8_t i;
 
	UART_Init(9600); //Initialize UART at 9600 baud
 
	UART_TxString("\n\rErasing the Eeprom");
	EEPROM_Erase();
	UART_TxString("\n\rWriting below data into eeprom");
	UART_TxString("\n\rchar= A");
	UART_TxString("\n\r5-Bytes= 10,20,35,50,60");
	UART_TxString("\n\rString: hello, world");
	UART_Printf("\n\r32-bit number= %L",v_writeNumber_u32);
	EEPROM_WriteByte(10,'A');
	EEPROM_WriteNBytes(100,a_writeBuffer_u8,5);
	EEPROM_WriteString(150,"hello, world");
	EEPROM_WriteNBytes(200,&v_writeNumber_u32,sizeof(v_writeNumber_u32));
 
 
	UART_TxString("\n\r\n\rReading Data back from eeprom");
	v_readChar_u8 = EEPROM_ReadByte(10);
	EEPROM_ReadNBytes(100,a_readBuffer_u8,5);
	EEPROM_ReadString(150,a_readString_u8);
	EEPROM_ReadNBytes(200,&v_readNumber_u32,sizeof(v_readNumber_u32));
	UART_Printf("\n\rchar:%c",v_readChar_u8);
	UART_TxString("\n\r5-Bytes: ");
	for(i=0;i<5;i++)
		UART_Printf("%d ",a_readBuffer_u8[i]);
	UART_Printf("\n\rstring:%s",a_readString_u8);
	UART_Printf("\n\r32bit Number:%L",v_readNumber_u32);
 
 
	while(1);
 
	return 0;
}
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