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Updated EEPROM examples.
Removed hard coded lengths, which were incorrect for standard Arduino's now.
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@ -2,22 +2,34 @@
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* EEPROM Clear
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*
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* Sets all of the bytes of the EEPROM to 0.
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* Please see eeprom_iteration for a more in depth
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* look at how to traverse the EEPROM.
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*
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* This example code is in the public domain.
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*/
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#include <EEPROM.h>
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void setup()
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{
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// write a 0 to all 512 bytes of the EEPROM
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for (int i = 0; i < 512; i++)
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/***
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Iterate through each byte of the EEPROM storage.
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Larger AVR processors have larger EEPROM sizes, E.g:
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- Arduno Duemilanove: 512b EEPROM storage.
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- Arduino Uno: 1kb EEPROM storage.
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- Arduino Mega: 4kb EEPROM storage.
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Rather than hard-coding the length, you should use the pre-provided length function.
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This will make your code portable to all AVR processors.
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***/
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for ( int i = 0 ; i < EEPROM.length() ; i++ )
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EEPROM.write(i, 0);
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// turn the LED on when we're done
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digitalWrite(13, HIGH);
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}
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void loop()
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{
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}
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void loop(){ /** Empty loop. **/ }
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@ -31,13 +31,27 @@ void loop()
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Serial.print(value, DEC);
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Serial.println();
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// advance to the next address of the EEPROM
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address = address + 1;
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// there are only 512 bytes of EEPROM, from 0 to 511, so if we're
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// on address 512, wrap around to address 0
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if (address == 512)
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address = 0;
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/***
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Advance to the next address, when at the end restart at the beginning.
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Larger AVR processors have larger EEPROM sizes, E.g:
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- Arduno Duemilanove: 512b EEPROM storage.
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- Arduino Uno: 1kb EEPROM storage.
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- Arduino Mega: 4kb EEPROM storage.
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Rather than hard-coding the length, you should use the pre-provided length function.
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This will make your code portable to all AVR processors.
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***/
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addr = addr + 1;
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if(addr == EEPROM.length())
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addr = 0;
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/***
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As the EEPROM sizes are powers of two, wrapping (preventing overflow) of an
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EEPROM address is also doable by a bitwise and of the length - 1.
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++addr &= EEPROM.length() - 1;
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***/
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delay(500);
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}
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@ -38,15 +38,32 @@ void loop()
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The function EEPROM.update(addr, val) is equivalent to the following:
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if( EEPROM.read(addr) != val ){
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EEPROM.write(addr, val);
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EEPROM.write(addr, val);
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}
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***/
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/** advance to the next address. there are 512 bytes in the EEPROM, so go back to 0 when we hit 512. **/
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/***
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Advance to the next address, when at the end restart at the beginning.
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Larger AVR processors have larger EEPROM sizes, E.g:
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- Arduno Duemilanove: 512b EEPROM storage.
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- Arduino Uno: 1kb EEPROM storage.
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- Arduino Mega: 4kb EEPROM storage.
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Rather than hard-coding the length, you should use the pre-provided length function.
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This will make your code portable to all AVR processors.
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***/
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addr = addr + 1;
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if (addr == 512)
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if(addr == EEPROM.length())
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addr = 0;
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/***
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As the EEPROM sizes are powers of two, wrapping (preventing overflow) of an
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EEPROM address is also doable by a bitwise and of the length - 1.
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++addr &= EEPROM.length() - 1;
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***/
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delay(100);
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}
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@ -8,31 +8,51 @@
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#include <EEPROM.h>
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// the current address in the EEPROM (i.e. which byte
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// we're going to write to next)
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int addr = 0;
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/** the current address in the EEPROM (i.e. which byte we're going to write to next) **/
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int addr = 0;
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void setup()
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{
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}
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void setup(){ /** Empty setup. **/}
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void loop()
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{
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// need to divide by 4 because analog inputs range from
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// 0 to 1023 and each byte of the EEPROM can only hold a
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// value from 0 to 255.
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/***
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Need to divide by 4 because analog inputs range from
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0 to 1023 and each byte of the EEPROM can only hold a
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value from 0 to 255.
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***/
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int val = analogRead(0) / 4;
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// write the value to the appropriate byte of the EEPROM.
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// these values will remain there when the board is
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// turned off.
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/***
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Write the value to the appropriate byte of the EEPROM.
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these values will remain there when the board is
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turned off.
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***/
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EEPROM.write(addr, val);
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// advance to the next address. there are 512 bytes in
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// the EEPROM, so go back to 0 when we hit 512.
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/***
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Advance to the next address, when at the end restart at the beginning.
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Larger AVR processors have larger EEPROM sizes, E.g:
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- Arduno Duemilanove: 512b EEPROM storage.
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- Arduino Uno: 1kb EEPROM storage.
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- Arduino Mega: 4kb EEPROM storage.
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Rather than hard-coding the length, you should use the pre-provided length function.
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This will make your code portable to all AVR processors.
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***/
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addr = addr + 1;
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if (addr == 512)
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if(addr == EEPROM.length())
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addr = 0;
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/***
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As the EEPROM sizes are powers of two, wrapping (preventing overflow) of an
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EEPROM address is also doable by a bitwise and of the length - 1.
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++addr &= EEPROM.length() - 1;
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***/
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delay(100);
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}
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