Attiny2313 password based switch

[thannara123]

Hello expetrs
I am trying to make a code lock (with reffrence https://extremeelectronics.co.in/avr-projects/avr-project-atmega8-based-smart-code-lock/) here they used avr8 . but i changed it as attiny2313 . How to program its EEPROm

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[FONT=Consolas][SIZE=2][COLOR=#800000][/COLOR][/SIZE][/FONT][FONT=Consolas][SIZE=2][FONT=Consolas][SIZE=2]WritePassToEEPROM(1234);[/SIZE][/FONT][/SIZE][/FONT][FONT=Consolas][SIZE=2][COLOR=#800000][/COLOR][/SIZE][/FONT]
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what is the blank value attiny 2313 ?

please help me

 

[alexan_e]

I have already provided you with a link to my blog that showed how you read/write the AVR eeprom so I don't understand the question.
mega and tiny use the same way to access the eeprom.

 

[jayanth.devarayanadurga]

 if 
 
(ReadPassFromEEPROM()==25755)

means the password is checked with 25777. If the password read using ReadPassFromEEPROM() is 25775 then a default password 1234 is written to the eeprom. The address will be in the 2 functions used.

 WritePassToEEPROM(1234);

means writing the password 1234 to eeprom.

The code should be something like this

//Check if the EEPROM has a valid password or is blank
 if((ReadPassFromEEPROM()==25755) || (ReadPassFromEEPROM()==0))
   {
      //Password is blank or 25755 so store a default password

      WritePassToEEPROM(1234);
   }

 

[thannara123]

In avr8(ReadPassFromEEPROM()==25755) // .they told that ,it is the default EEPROM value ,(that is nothing write -first time programing )
if so what is the defult value of attiny EEPROM

 

[jayanth.devarayanadurga]

Can you post the code for ReadPassFromEEPROM() and WritePassToEEPROM() functions? Can you tell me what is the eeprom size of avr8 and attiny2313?

 

[thannara123]

#include <avr/io.h>
#include <inttypes.h>

#include "eeprom.h"

uint8_t EEPROMRead(uint16_t uiAddress)
{
	/* Wait for completion of previous write */
	while(EECR & (1<<EEPE));
	/* Set up address register */
	EEAR = uiAddress;
	/* Start eeprom read by writing EERE */
	EECR |= (1<<EERE);
	/* Return data from data register */
	return EEDR;
}

void EEPROMWrite(uint16_t uiAddress, uint8_t ucData)
{
	/* Wait for completion of previous write */
	while(EECR & (1<<EEPE));
	/* Set up address and data registers */
	EEAR = uiAddress;
	EEDR = ucData;
	/* Write logical one to EEMWE */
	EECR |= (1<<EEMPE);
	/* Start eeprom write by setting EEWE */
	EECR |= (1<<EEPE);
}

 

[jayanth.devarayanadurga]

Your way of using the functions are wrong.

See the prototypes

uint8_t EEPROMRead(uint16_t uiAddress)
void EEPROMWrite(uint16_t uiAddress, uint8_t ucData)

You have to pass address to uint8_t EEPROMRead(uint16_t uiAddress) like this EEPROMRead(1234); 1234 is the 16 bit address.
To Write you have to pass the address and data like EEPROMWrite(1234, 25); 1234 is the address and 25 is the data.

You didn't post the code for ReadPassFromEEPROM() and WritePassToEEPROM() functions.

See this is the code for the 2 functions

 void WritePassToEEPROM(uint16_t pass)
{

	EEPROMWrite(0000,(pass%100));
	EEPROMWrite(0001,(pass/100));
}

uint16_t ReadPassFromEEPROM()
{

	return (EEPROMRead(0001)*100  +	EEPROMRead(0000));
}

The WritePassToEEPROM() function writes to 2 addresses 0000 and 0001. Eg. if password is 1234 then 1234%100 is 34 and 1234/100 is 12. So, at address 0000 it will be 34 and at address 0001 it will be 12.
While reading EEPROMRead(0000) will return 34 and EEPROMRead(0001)*100 will return 1200. 1200 + 34 is 1234. ReadPassFromEEPROM() function returns 16 bit or 2 bytes 1234.

 

[alexan_e]

Your way of using the functions are wrong.

No they are not, don't jump to conclusions in a hurry

void WritePassToEEPROM(uint16_t pass)
{

	EEPROMWrite(0000,(pass%100));
	EEPROMWrite(0001,(pass/100));
}

uint16_t ReadPassFromEEPROM()
{

	return (EEPROMRead(0001)*100  +	EEPROMRead(0000));
}

- - - Updated - - -

what is the blank value attiny 2313 ?

If I'm not mistaken the eeprom space is filled with 1s so this would give a default of (255 * 100)+255 = 25755

Why don't you use WritePassToEEPROM(); to write the new password you want to use?