Flash_Storage.ino

// Credit to Marzogh for example code that was used
// Written by Roman Silivra for UC Berkeley STAR

#include <SPIMemory.h>

// Designate SPI pins
const int8_t PIN_SCK = 8;
const int8_t PIN_MISO = 10;
const int8_t PIN_MOSI = 9;
const int8_t PIN_CS = 14; // CS pins are 11, 12, 13, 14, 21, 47, 48; all but 14 (250 MB NAND) currently work, suspect wiring issue
const unsigned long BAUD_RATE = 115200;

// Method to print horizontal lines
void printLine() {
  Serial.println();
  for (uint8_t i = 0; i < 125; i++) {
    Serial.print("-");
  }
  Serial.println();
}

// Initialize the flash object
SPIFlash flash(PIN_CS);

void setup() {
    // Start SPI 
    SPI.begin(PIN_SCK, PIN_MISO, PIN_MOSI, PIN_CS);

    // Start Serial
    Serial.begin(BAUD_RATE);
    while(!Serial);
    delay(50);
    
    // Horizontal line to improve visibility
    printLine();
    Serial.println("Serial connection established, beginning flash");

    // Start flash assuming size of 32 Megabytes, check for errors
    flash.begin();
    // if (flash.error()) {
    //   Serial.println(flash.error(VERBOSE));
    // }
    Serial.println("Flash set-up complete");

    // // Erase chip
    // Serial.println("Erasing chip...");
    // flash.eraseBlock32K(0);
    // Serial.println("Erased chip");

    // Test String "Hello world!"
    String testStr = "Hello world!";
    uint16_t strSize = sizeof(char)*(testStr.length()+1);
    Serial.print("Size of string is: ");
    Serial.println(strSize);
    
    uint32_t testAddress = flash.getAddress(strSize);
    Serial.print("Address of string is: 0x");
    Serial.println(testAddress, HEX);
    
    // Try to write that String to memory
    flash.writeStr(testAddress, testStr, strSize);

    String outputStr = String(testStr.length()+1); 
    // Try to read that String from memory
    flash.readStr(testAddress, outputStr, strSize);
    delay(20);
    Serial.print("The read string is: ");
    Serial.println(outputStr);

    // uint16_t testUint = 0;
    // testAddress = testAddress + 0xD;
    // Serial.print("Address of string is: 0x");
    // Serial.println(testAddress, HEX);
    // testUint = flash.readWord(testAddress);
    // delay(20);
    // Serial.print("The read word is: ");
    // Serial.println(testUint, HEX);
}
void loop() {

}