57 lines
1.4 KiB
Arduino
57 lines
1.4 KiB
Arduino
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/*
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* EEPROM Read
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*
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* Reads the value of each byte of the EEPROM and prints it
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* to the computer.
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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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// start reading from the first byte (address 0) of the EEPROM
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int address = 0;
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byte value;
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void setup() {
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// initialize serial and wait for port to open:
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Serial.begin(9600);
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while (!Serial) {
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; // wait for serial port to connect. Needed for native USB port only
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}
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}
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void loop() {
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// read a byte from the current address of the EEPROM
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value = EEPROM.read(address);
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Serial.print(address);
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Serial.print("\t");
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Serial.print(value, DEC);
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Serial.println();
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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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address = address + 1;
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if (address == EEPROM.length()) {
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address = 0;
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}
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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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++address &= EEPROM.length() - 1;
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***/
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delay(500);
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}
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