45 lines
1.4 KiB
C++
Executable File
45 lines
1.4 KiB
C++
Executable File
#include <Wire.h>
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#define eeprom 0x50 //defines the base address of the EEPROM
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void setup(void){
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Wire.begin(); //creates a Wire object
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Serial.begin(9600);
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unsigned int address = 0; //first address of the EEPROM
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Serial.println("We write the zip code 22222, a zip code in Arlington, Virginia!");
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for(address = 0; address< 5; address++)
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writeEEPROM(eeprom, address, '2'); // Writes 22222 to the EEPROM
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for(address = 0; address< 5; address++) {
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Serial.print(readEEPROM(eeprom, address), HEX);
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}
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}
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void loop(){
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//there's nothing in the loop() function because we don't want the arduino to repeatedly write the same thing to the EEPROM over and over. We just want a one-time write, so the loop() function is avoided with EEPROMs.
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}
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//defines the writeEEPROM function
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void writeEEPROM(int deviceaddress, unsigned int eeaddress, byte data ) {
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Wire.beginTransmission(deviceaddress);
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Wire.write((int)(eeaddress >> 8)); //writes the MSB
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Wire.write((int)(eeaddress & 0xFF)); //writes the LSB
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Wire.write(data);
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Wire.endTransmission();
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}
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//defines the readEEPROM function
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byte readEEPROM(int deviceaddress, unsigned int eeaddress ) {
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byte rdata = 0xFF;
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Wire.beginTransmission(deviceaddress);
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Wire.write((int)(eeaddress >> 8)); //writes the MSB
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Wire.write((int)(eeaddress & 0xFF)); //writes the LSB
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Wire.endTransmission();
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Wire.requestFrom(deviceaddress,1);
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if (Wire.available())
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rdata = Wire.read();
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return rdata;
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}
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