64 lines
1.7 KiB
Arduino
64 lines
1.7 KiB
Arduino
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/*
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EEPROM Write
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Stores random values into the EEPROM.
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These values will stay in the EEPROM when the board is
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turned off and may be retrieved later by another sketch.
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*/
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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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#define EEPROM_SIZE 64
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void setup()
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{
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Serial.begin(115200);
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Serial.println("start...");
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if (!EEPROM.begin(EEPROM_SIZE))
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{
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Serial.println("failed to initialise EEPROM"); delay(1000000);
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}
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Serial.println(" bytes read from Flash . Values are:");
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for (int i = 0; i < EEPROM_SIZE; i++)
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{
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Serial.print(byte(EEPROM.read(i))); Serial.print(" ");
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}
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Serial.println();
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Serial.println("writing random n. in memory");
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}
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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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// int val = analogRead(10) / 4;
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int val = byte(random(10020));
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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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EEPROM.write(addr, val);
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Serial.print(val); Serial.print(" ");
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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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// save all changes to the flash.
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addr = addr + 1;
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if (addr == EEPROM_SIZE)
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{
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Serial.println();
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addr = 0;
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EEPROM.commit();
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Serial.print(EEPROM_SIZE);
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Serial.println(" bytes written on Flash . Values are:");
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for (int i = 0; i < EEPROM_SIZE; i++)
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{
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Serial.print(byte(EEPROM.read(i))); Serial.print(" ");
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}
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Serial.println(); Serial.println("----------------------------------");
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}
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delay(100);
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}
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