eepromTest.ino

//Test extEEPROM library.
//Writes the EEPROM full of 32-bit integers and reads them back to verify.
//Wire a button from digital pin 6 to ground, this is used as a start button
//so the sketch doesn't do unnecessary EEPROM writes every time it's reset.
//Jack Christensen 09Jul2014
//Paolo Paolucci 17Mar2016 (fix 28Jun2017)
 
#include <extEEPROM.h>    //https://github.com/PaoloP74/extEEPROM
 
//One 24LC256 EEPROMs on the bus
const uint32_t totalKBytes = 32;         //for read and write test functions
extEEPROM eep(kbits_256, 1, 64);         //device size, number of devices, page size
 
const uint8_t btnStart = 6;              //start button
 
void setup(void)
{
    pinMode(btnStart, INPUT_PULLUP);
    Serial.begin(115200);
    uint8_t eepStatus = eep.begin(eep.twiClock400kHz);   //go fast!
    if (eepStatus) {
        Serial.print(F("extEEPROM.begin() failed, status = "));
        Serial.println(eepStatus);
        while (1);
    }
 
    Serial.println(F("Press button to start..."));
    while (digitalRead(btnStart) == HIGH) {
        delay(10);    //wait for button push
    }
 
    uint8_t chunkSize =
        64;    //this can be changed, but must be a multiple of 4 since we're writing 32-bit integers
    //    eeErase(chunkSize, 0, totalKBytes * 1024 - 1);
    eeWrite(chunkSize);
    eeRead(chunkSize);
 
    dump(0, 32);            //the first 32 bytes
    dump(32256, 64);        //the last 64 bytes
    //dump(32512, 64);        //across the device boundary
    //dump(65520, 16);        //the last 16 bytes
}
 
void loop(void)
{
}
 
//write test data (32-bit integers) to eeprom, "chunk" bytes at a time
void eeWrite(uint8_t chunk)
{
    chunk &= 0xFC;                //force chunk to be a multiple of 4
    uint8_t data[chunk];
    uint32_t val = 0;
    Serial.println(F("Writing..."));
    uint32_t msStart = millis();
 
    for (uint32_t addr = 0; addr < totalKBytes * 1024; addr += chunk) {
        if ( (addr & 0xFFF) == 0 ) {
            Serial.println(addr);
        }
        for (uint8_t c = 0; c < chunk; c += 4) {
            data[c + 0] = val >> 24;
            data[c + 1] = val >> 16;
            data[c + 2] = val >> 8;
            data[c + 3] = val;
            ++val;
        }
        eep.write(addr, data, chunk);
    }
    uint32_t msLapse = millis() - msStart;
    Serial.print(F("Write lapse: "));
    Serial.print(msLapse);
    Serial.println(F(" ms"));
}
 
//read test data (32-bit integers) from eeprom, "chunk" bytes at a time
void eeRead(uint8_t chunk)
{
    chunk &= 0xFC;                //force chunk to be a multiple of 4
    uint8_t data[chunk];
    uint32_t val = 0, testVal;
    Serial.println(F("Reading..."));
    uint32_t msStart = millis();
 
    for (uint32_t addr = 0; addr < totalKBytes * 1024; addr += chunk) {
        if ( (addr & 0xFFF) == 0 ) {
            Serial.println(addr);
        }
        eep.read(addr, data, chunk);
        for (uint8_t c = 0; c < chunk; c += 4) {
            testVal =  ((uint32_t)data[c + 0] << 24) + ((uint32_t)data[c + 1] << 16) + ((
                           uint32_t)data[c + 2] << 8) + (uint32_t)data[c + 3];
            if (testVal != val) {
                Serial.print(F("Error @ addr "));
                Serial.print(addr + c);
                Serial.print(F(" Expected "));
                Serial.print(val);
                Serial.print(F(" Read "));
                Serial.print(testVal);
                Serial.print(F(" 0x"));
                Serial.println(testVal, HEX);
            }
            ++val;
        }
    }
    uint32_t msLapse = millis() - msStart;
    Serial.print(F("Last value: "));
    Serial.print(val);
    Serial.print(F(" Read lapse: "));
    Serial.print(msLapse);
    Serial.println(F(" ms"));
}
 
//write 0xFF to eeprom, "chunk" bytes at a time
void eeErase(uint8_t chunk, uint32_t startAddr, uint32_t endAddr)
{
    chunk &= 0xFC;                //force chunk to be a multiple of 4
    uint8_t data[chunk];
    Serial.println(F("Erasing..."));
    for (int i = 0; i < chunk; i++) {
        data[i] = 0xFF;
    }
    uint32_t msStart = millis();
 
    for (uint32_t a = startAddr; a <= endAddr; a += chunk) {
        if ( (a & 0xFFF) == 0 ) {
            Serial.println(a);
        }
        eep.write(a, data, chunk);
    }
    uint32_t msLapse = millis() - msStart;
    Serial.print(F("Erase lapse: "));
    Serial.print(msLapse);
    Serial.print(F(" ms"));
}
 
//dump eeprom contents, 16 bytes at a time.
//always dumps a multiple of 16 bytes.
void dump(uint32_t startAddr, uint32_t nBytes)
{
    Serial.print(F("EEPROM DUMP 0x"));
    Serial.print(startAddr, HEX);
    Serial.print(F(" 0x"));
    Serial.print(nBytes, HEX);
    Serial.print(F(" "));
    Serial.print(startAddr);
    Serial.print(F(" "));
    Serial.println(nBytes);
    uint32_t nRows = (nBytes + 15) >> 4;
 
    uint8_t d[16];
    for (uint32_t r = 0; r < nRows; r++) {
        uint32_t a = startAddr + 16 * r;
        eep.read(a, d, 16);
        Serial.print(F("0x"));
        if ( a < 16 * 16 * 16 ) {
            Serial.print(F("0"));
        }
        if ( a < 16 * 16 ) {
            Serial.print(F("0"));
        }
        if ( a < 16 ) {
            Serial.print(F("0"));
        }
        Serial.print(a, HEX);
        Serial.print(F(" "));
        for ( int c = 0; c < 16; c++ ) {
            if ( d[c] < 16 ) {
                Serial.print(F("0"));
                Serial.print(d[c], HEX);
                Serial.print( c == 7 ? "  " : " ");
            }
        }
        Serial.println(F(""));
    }
}