Difference between revisions of "EEPROM"

Line 148: Line 148:
 
==user guide==
 
==user guide==
 
<syntaxhighlight>
 
<syntaxhighlight>
−
/* Program to blink the LEDs using delay routines*/
+
#include"uart.h"
 +
#include"delay.h"
 +
#include"eeprom.h"
  
−
#include<reg52.h>
+
int main()
−
#include "delay.h"  //User defined library which contains the delay routines
+
{
  
 +
uint8_t a_writeBuffer_u8[5]={10,20,35,50,60};
 +
char a_readString_u8[20];
 +
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");
 +
EEPROM_WriteByte(10,'A');
 +
EEPROM_WriteNBytes(100,a_writeBuffer_u8,5);
 +
EEPROM_WriteString(150,"hello, world");
  
−
int  main()
 
−
{
 
  
 +
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);
 +
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);
  
−
while(1)
 
−
{
 
−
PO = 0xff;      /* Turn ON the LEDs */
 
−
DELAY_us(10);  /* Generate the delay of 1sec+10ms+10us */
 
−
DELAY_ms(10);
 
−
DELAY_sec(1);
 
  
−
P0 = 0x00;    /* Turn OFF the LEDs */
+
  while(1);
−
DELAY_us(10); /* Generate the delay of 1sec+10ms+10us */
+
−
DELAY_ms(10);
+
−
DELAY_sec(1);
+
  
−
}
+
  return 0;
 +
  }
  
−
return 0;
 
−
}
 
 
</syntaxhighlight>
 
</syntaxhighlight>

Revision as of 20:09, 25 December 2014

EEPROM

EEPROM_WriteByte

{{#Widget:LibTable}}
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

{{#Widget:LibTable}}
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

{{#Widget:LibTable}}
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

#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];
 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");
 EEPROM_WriteByte(10,'A');
 EEPROM_WriteNBytes(100,a_writeBuffer_u8,5);
 EEPROM_WriteString(150,"hello, world");
 
 
 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);
 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);
 
 
 while(1);
 
  return 0;
  }
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